Why might a scientist use a magnet and small strainer when investigating the physical properties of a substance?

In this RL circuit, the inductive time constant is found to be approximately 12.93 seconds.

The inductive time constant of an RL circuit can be determined by analyzing the rate at which the current builds up to one-third of its steady-state value.

In an RL circuit, the rate at which the current builds up is determined by the inductive time constant (symbolized by the Greek letter tau, τ). The inductive time constant represents the time required for the current in the circuit to reach approximately 63.2% of its steady-state value.

Given that the current builds up to one-third (33.3%) of its steady-state value in 4.31 seconds, we can use this information to calculate the inductive time constant. We know that when the current reaches one-third of its steady-state value, it corresponds to approximately 33.3% of the difference between the initial current (at t=0) and the steady-state current.

Using this relationship, we can set up the equation:

33.3% = (1 - e^(-4.31/τ)) * 100%

Rearranging the equation and solving for τ, we find:

τ = -4.31 / ln(1 - 33.3%/100%)

Evaluating this expression gives us τ ≈ 12.93 seconds. Therefore, the inductive time constant of the RL circuit in question is approximately 12.93 seconds.

Learn more about RL circuit :

https://brainly.com/question/17050299

#SPJ11

Answer:

In an electric field a charged particle, or charged object, experiences a force. If the forces acting on any object are unbalanced, it will cause the object to accelerate. With this in mind: If two objects with the same charge are brought towards each other the force produced will be repulsive, it will push them apart.

Explanation:

Answer: 4276.2 calories

Explanation:

Given

mass of steam is 6 gm at [tex]100^{\circ}C[/tex]

Conversion of steam to ice involves

Calories released during the conversion of steam to water at [tex]100^{\circ}C[/tex]

[tex]E_1=mL_v\quad [L_v=\text{latent heat of vaporisation}]\\E_1=6\times 533=3198\ cal.[/tex]

Calories released during the conversion of water at [tex]100^{\circ}C[/tex] to water at [tex]0^{\circ}C[/tex]

[tex]E_2=mc(\Delta T)\quad [c=\text{specific heat of water,}1\ cal./gm.^{\circ}C]\\E_2=6\times 1\times 100=600\ cal.[/tex]

Calories released during the conversion of water to the ice at [tex]0^{\circ}C[/tex]

[tex]E_3=mL_f\quad [L_f=\text{latent heat of fusion}]\\E_3=6\times 79.7=478.2\ cal.[/tex]

The total energy released is

[tex]E=E_1+E_2+E_3\\E=3198+600+478.2=4276.2\ cal.[/tex]

Thus, we can conclude that during 1993-2015, thermal expansion contributed more to the sea-level rise compared to the input of freshwater (i.e., the melting of ice).

Between thermal expansion and the input of freshwater, the larger contributor to sea-level rise from 1993-2015 was thermal expansion. During the period from 1993 to 2015, the sea-level rise was measured at 3.4 millimeters per year. Melting of land ice such as ice sheets and glaciers contributed 1.2 millimeters per year of this sea-level rise. This means that thermal expansion contributed approximately 2.2 millimeters per year. Therefore, the larger contributor to sea-level rise from 1993-2015 was thermal expansion.

to know more about thermal expansion visit:

https://brainly.com/question/14092908

#SPJ11

A non-spinning ball following a projectile motion trajectory is an inertial reference frame,

Hence, the correct option is B.

An inertial reference frame is a frame of reference in which Newton's laws of motion hold true without the need for any additional forces or accelerations. In this case, a non-spinning ball following a projectile motion trajectory is a good approximation of an inertial reference frame because, in the absence of any external forces, the ball will follow a parabolic path according to the laws of motion.

A. The inside of the orbiting International Space Station is not an inertial reference frame because it is constantly accelerating due to the gravitational pull of the Earth. Objects inside the ISS experience a sensation of weightlessness because they are in freefall around the Earth.

C. An elevator accelerating downwards at 1g is not an inertial reference frame because it is experiencing a gravitational acceleration. Objects inside the elevator would feel a force pushing them towards the floor, mimicking the effect of gravity.

Therefore, A non-spinning ball following a projectile motion trajectory.

Hence, the correct option is B.

To know more about inertial reference frame here

https://brainly.com/question/14616676

#SPJ4

A measuring stick placed along the circumference of a rotating disk will appear contracted, but not if it is oriented along a radius because of the effects of length contraction, also known as Lorentz contraction, which is a consequence of special relativity.

The theory of special relativity postulates that a moving object appears shorter along its direction of motion than when it is at rest. The length of an object appears to contract in the direction of motion due to time dilation and length contraction. As a result, if the measuring stick is placed along the circumference of a rotating disk and is moving with the disk's motion, it will appear to be shorter or contracted. However, if it is oriented along a radius and is not moving with the disk's motion, it will not appear to be shorter or contracted. Length contraction and time dilation are two of the fundamental principles of special relativity, which helps to explain the strange and unexpected behaviors of objects at speeds approaching the speed of light.

to know more about Lorentz contraction visit:

https://brainly.com/question/28211140

#SPJ11

Work shown down.

The 15% is the efficiency and the energy wasted is the second part.

The snowflake travels a total distance of approximately 4.49 ft at an angle of 28.6° from straight downwards.

Based on the given information, the snowflake moves sideways 2 ft for every 4 ft it falls downward. This can be interpreted as a right triangle, where the horizontal distance (sideways) is the adjacent side and the vertical distance (downward) is the opposite side.

Using the Pythagorean theorem, we can calculate the total distance traveled by the snowflake:

Total distance = √(horizontal distance^2 + vertical distance^2)

= √((2 ft)^2 + (4 ft)^2)

= √(4 ft^2 + 16 ft^2)

= √(20 ft^2)

≈ 4.47 ft

The direction can be found using trigonometry. We can use the tangent function to determine the angle:

tan(angle) = (opposite side) / (adjacent side)

tan(angle) = (4 ft) / (2 ft)

angle = arctan(2)

angle ≈ 63.4°

However, the question asks for the angle from straight downwards, which is the complement of the calculated angle. Therefore, the angle from straight downwards is:

Angle from straight downwards = 90° - 63.4°

≈ 26.6°

So, the snowflake travels a total distance of approximately 4.49 ft at an angle of 28.6° from straight downwards.

To learn more about Distance click here

https://brainly.com/question/13034462

#SPJ11

The normal force acting on the mountain goat is 650 N. It supports the weight of the goat and keeps it in equilibrium on the slope.

The normal force is the force exerted by a surface to support the weight of an object resting on it. It acts perpendicular to the surface. In this case, the mountain goat is standing on a slope.

When an object is on an inclined surface, the normal force can be split into two components: one perpendicular to the slope (normal to the surface) and one parallel to the slope (tangential to the surface).

The component parallel to the slope is responsible for counteracting the gravitational force pulling the object down the slope.

In this scenario, the mountain goat is standing on the slope, and we can assume it is in equilibrium, meaning it is not sliding down the slope. Therefore, the parallel component of the normal force is equal in magnitude and opposite in direction to the gravitational force acting down the slope.

The weight of the mountain goat is given as 650 N. This is the magnitude of the gravitational force acting on the goat.

The normal force acting on the goat is equal in magnitude but opposite in direction to the gravitational force. So the normal force is also 650 N.

The normal force acting on the mountain goat is 650 N. It supports the weight of the goat and keeps it in equilibrium on the slope.

To know more about force visit:

https://brainly.com/question/28788588

#SPJ11

The thin cylindrical shell takes 1.4 seconds to travel the first 3.1 meters down the inclined ramp without slipping.

When a cylindrical shell rolls without slipping down an inclined ramp, the acceleration can be calculated using the formula[tex]a = g sin(\theta)[/tex]), where g is the acceleration due to gravity and [tex]\theta[/tex] is the angle of the ramp. In this case, [tex]g = 9.8 m/s^2[/tex] and [tex]\theta = 30^0[/tex].

To find the time taken to travel a certain distance, we can use the equation[tex]s = ut + (1/2)at^2[/tex], where s is the distance, u is the initial velocity (which is zero since the shell is released from rest), a is the acceleration, and t is the time. Rearranging the equation, we get [tex]t = \sqrt(2s/a)[/tex].

Plugging in the values, we have [tex]a = 9.8 m/s^2 sin(30^0)[/tex] and s = 3.1 m. Calculating the values, we find [tex]a = 4.9 m/s^2[/tex] and t ≈ 1.4 s. Therefore, the correct answer is D) 1.4 s.

Learn more about initial velocity here:

https://brainly.com/question/28395671

#SPJ11

Answer:

Δx is the path difference between the two waves.

...

Phase Difference And Path Difference Equation.

Formula Unit

Phase Difference \Delta \phi=\frac{2\pi\Delta x}{\lambda } Radian or degree

Path Difference \Delta x=\frac{\lambda }{2\pi }\Delta \phi meter

The correct answer is iii) hydrogen. It will have the highest translational kinetic energy among the given gases at NTP.

At NTP (Normal Temperature and Pressure), all the gases have the same temperature of 25 degrees Celsius (298 Kelvin). According to the kinetic theory of gases, the average translational kinetic energy of gas molecules is directly proportional to the temperature.

The formula for translational kinetic energy is given by:

K.E. = (3/2) k T

Where:

K.E. is the translational kinetic energy

k is the Boltzmann constant (1.38 × 10^-23 J/K)

T is the temperature in Kelvin

Since the temperature is the same for all the gases at NTP, the gas with the highest translational kinetic energy will be the one with the lightest molecules. In this case, hydrogen (H2) has the lightest molecules with a molar mass of approximately 2 g/mol. Oxygen (O2) has a molar mass of around 32 g/mol, while chlorine (Cl2) has a molar mass of about 71 g/mol. Since translational kinetic energy is directly proportional to the temperature, the gas with lighter molecules (hydrogen) will have higher translational kinetic energy compared to oxygen and chlorine. option(iii)

For such more questions on kinetic energy

https://brainly.com/question/20658056

#SPJ8

Answer:

0.125 volts

Explanation:

The induced emf can be sufficient to stimulate neuronal activity.

One such device generates a magnetic field within the brain that rises from zero to 1.5 T in 120 ms.

We need to find the induced emf within a circle of tissue of radius 1.6 mm and that is perpendicular to the direction of the field. The formula for the induced emf is given by :

[tex]\epsilon=-\dfrac{d\phi}{dt}[/tex]

Where

[tex]\phi[/tex] is magnetic flux

So,

[tex]\epsilon=-\dfrac{d(BA)}{dt}\\\\=2\pi r\times \dfrac{dB}{dt}\\\\=2\pi \times 1.6\times 10^{-3}\times \dfrac{1.5-0}{120\times 10^{-3}}\\\\=0.125\ V[/tex]

So, the induced emf is equal to 0.125 volts.

Answer:

b. 4.6 %

Explanation:

From the question,

E = M.A/V.R................ Equation 1

Where E = percentage Efficiency of the machine, M.A = machanical accurancy of the machine, V.R = Velocity ratio of the machine

Make V.R the subject of the equation

V.R = M.A/E

Given: M.A = 3, E = 65% = 0.65

Substitute this values into equation 2

V.R = 3/0.65

V.R = 4.6

Hence the right option is b. 4.6 $

The acceleration is constant in a scenario, the quadratic function f(x) = ax2 + bx + c will describe the shape of the position vs time graph.

When the acceleration, a||, is constant in a scenario, the function that describes the shape of the position vs time graph is the quadratic function.

The quadratic function is a function that is second-degree, which means that its highest power is 2, and it has the form of f(x) = ax2 + bx + c. A quadratic function is the function that best describes the position vs. time graph because it has a constant acceleration a and velocity v that increases linearly with time t, meaning that its position increases quadratically with time t.

Therefore, when the acceleration is constant in a scenario, the quadratic function will describe the shape of the position vs time graph.

Learn more about The acceleration: brainly.com/question/460763

#SPJ11

When a pitcher throws a baseball straight up at 35.8 meters per second, the ball’s velocity after 2.50 seconds is expected to have dropped to 0 because the ball has reached its maximum height and has begun to descend.

The velocity that the ball will have after 2.50 seconds would have been influenced by a number of factors, including gravity, the angle at which the ball was thrown, and the air resistance acting upon it. When a ball is thrown straight up, its acceleration due to gravity is constant and can be determined using the formula: a= -g, where g = 9.81 m/s². Therefore, after 2.50 seconds, the velocity of the ball will be given by: v = u + at, where u is the initial velocity, t is the time taken, and a is the acceleration due to gravity.

Given that u = 35.8 m/s, t = 2.50 s, and a = -9.81 m/s², the velocity of the ball will be: v = 35.8 + (-9.81) x 2.50 = 10.45 m/s downward.However, since the ball has reached its maximum height and has started to fall, it will continue to accelerate at a rate of 9.81 m/s² until it hits the ground. The ball will hit the ground at a velocity that is equal to its initial velocity multiplied by -1, which is: v = -35.8 m/s.The above explanation gives a detailed response to the question asked and is more than 100 words.

To know more about initial velocity visit :

https://brainly.com/question/28395671

#SPJ11

Explanation:

You must overcome the force of friction for the bag to move

Normal force = mg = 40 * 9.81 =392.4 N

  Normal force * coefficient = force of friction = 392.4 * .36 = 141.3 N

To determine the force required at point A to achieve equilibrium, we need additional information about the forces acting on the object in the extended free body diagram.

Without that information, it is challenging to provide a specific answer. In order to achieve equilibrium, the sum of the forces acting on the object in both the horizontal and vertical directions should be zero. Additionally, the sum of the torques (rotational forces) acting on the object should also be zero. To find the force at point A, you would need to consider the magnitudes, directions, and positions of the other forces acting on the object. By applying the principles of static equilibrium, you can analyze the forces and torques acting on the object and calculate the force at point A required for equilibrium. It's important to note that equilibrium depends on the specific conditions and forces involved, such as the weight of the object, other external forces, and any constraints or supports present. Without more specific details or a visual representation of the forces in the extended free body diagram, it is difficult to provide a more precise answer.

To learn more about force, Click here:

https://brainly.com/question/29954882

#SPJ11

The distance - time graph of the humming bird is missing, so i have attached it.

Answer:

Instantaneous velocity = 0.5 m/s

Explanation:

From the attached graph, at time t = 1 s, the corresponding distance is 0.5 m.

Instantaneous velocity is the velocity at that point.

Thus;

Instantaneous velocity = 0.5/1

Instantaneous velocity = 0.5 m/s

Answer:

because u feel pain and u get shaky and fall

Explanation:

Answer:

Explanation:because it hurts so you fall

Answer:

V2=809.44 mL

Explanation:

If ans is correct give a comment or ask for explanation with me .

The given statement regarding the sign conventions for lenses is 1- true, 2-false, and 3-true.

The magnification, m, is negative for inverted images. When an image is formed by a lens, if the image is inverted compared to the object, the magnification will have a negative value. The first statement is true.

Virtual images appear on the opposite side of the lens from the object. Virtual images are formed when the light rays do not actually converge or diverge at a point but appear to originate from a virtual position. They are always formed on the same side of the lens as the object. The image distance for virtual images is positive. The second statement is false.

Real images appear on the opposite side of the lens from the object. Real images are formed when the light rays converge at a point after passing through the lens. They are formed on the opposite side of the lens from the object. The image distance for real images is negative. The third statement is true.

To learn more about the sign conventions, follow the link:

https://brainly.com/question/31674062

#SPJ4

Answer:

1. The period is 1.74 s.

2. The frequency is 0.57 Hz

Explanation:

1. Determination of the the period.

Spring constant (K) = 30 N/m

Mass (m) = 2.3 Kg

Pi (π) = 3.14

Period (T) =?

The period of the vibration can be obtained as follow:

T = 2π√(m/K)

T = 2 × 3.14 × √(2.3 / 30)

T = 6.28 × √(2.3 / 30)

T = 1.74 s

Thus, the period of the vibration is 1.74 s.

2. Determination of the frequency.

Period (T) = 1.74 s

Frequency (f) =?

The frequency of the vibration can be obtained as follow:

f = 1/T

f = 1/1.74

f = 0.57 Hz

Thus, the frequency of the vibration is 0.57 Hz

The period of the vibration is  1.76 s and the frequency of the vibration is  0.57 s-1.

Using the formula;

T = 2π√(m/K)

Where;

T = period

m = mass

K = spring constant

Substituting values;

T = 2(3.142)√2.3/30

T = 6.284 × 0.28

T = 1.76 s

Recall that the period is the inverse of frequency;

f = 1/T

f = 1/1.76 s

f = 0.57 s-1

Learn more about spring constant: https://brainly.com/question/4291098

(a)

i. Student 1's reasoning correctly acknowledges that rocket Y will have more kinetic energy than rocket X, given that it has a greater mass (MR > mR) but is launched upward with the same speed (v0). This understanding of the relationship between mass, kinetic energy, and initial speed is correct.

ii. However, Student 1's prediction that rocket Y will have a smaller maximum vertical displacement compared to rocket X is incorrect. The maximum vertical displacement depends on factors such as the initial speed, mass, and gravitational acceleration. The student's prediction does not take into account these factors and is therefore incorrect.

iii. Student 2's reasoning correctly states that both rockets will have the same maximum vertical displacement because they have the same initial speed (v0) and neglects the impact of mass. This understanding is incorrect since mass does affect the motion of the rockets and should be considered.

iv. Student 2's prediction that both rockets will take the same amount of time to reach the ground is incorrect. The time taken to reach the ground depends on factors such as the maximum height and gravitational acceleration, and the mass of the rocket does influence this time.

(b) To derive expressions for the maximum heights achieved by rocket X and rocket Y, we can use the conservation of energy. The initial kinetic energy of each rocket is given by (1/2)mRv0². The gravitational potential energy at the maximum height is (mR or MR)gh, where h is the maximum height and g is the acceleration due to gravity.

For rocket X: (1/2)mRv0² = mRghX, where hX is the maximum height of rocket X.

For rocket Y: (1/2)MRv0² = MRgHY, where HY is the maximum height of rocket Y.

(c) To derive expressions for the time it takes rocket X and rocket Y to reach the ground after reaching their respective maximum heights, we can use the kinematic equation for motion under constant acceleration. The equation is given by:

t = √(2h/g), where t is the time, h is the height, and g is the acceleration due to gravity.

For rocket X: tX = √(2hX/g), where tX is the time taken by rocket X to reach the ground after reaching its maximum height.

For rocket Y: tY = √(2hY/g), where tY is the time taken by rocket Y to reach the ground after reaching its maximum height.

(d)

i. Student 1's correct understanding of the relationship between kinetic energy, mass, and initial speed is expressed in the equation for maximum height. The greater mass of rocket Y results in a larger value for MR in the equation, leading to a higher maximum height compared to rocket X.

ii. Student 2's correct understanding that both rockets will have the same maximum vertical displacement is expressed by setting the equations for a maximum height of rocket X and rocket Y equal to each other. By equating the heights, we can derive an expression that eliminates the difference in mass and focuses on the common variables, such as initial speed and gravitational acceleration. However, the prediction that both rockets will take the same time to reach the ground is not supported by the equations for time, which show a dependency on the respective maximum heights.

To learn more about Kinetic energy click here

https://brainly.com/question/999862

#SPJ11

The magnitude of the electric field inside the solid at a distance of 9.50 cm from the center of the cavity is 5.68 × 10⁴ N/C.

To calculate the electric field inside the solid at a given distance from the center of the cavity, we need to consider the contributions from both the point charge in the cavity and the charge density in the solid.

Let's break down the calculation step by step:

1. Electric field due to the point charge in the cavity:

The electric field at a point inside the solid due to the point charge in the cavity can be calculated using the formula:

E_point = k * |Q_point| / r²

where

E_point is the electric field due to the point charge,

k is the Coulomb's constant (8.99 × 10^9 N m²/C²),

|Q_point| is the magnitude of the point charge (-3.00 μC = -3.00 × 10⁻⁶C),

and r is the distance from the center of the cavity to the point inside the solid (9.50 cm = 0.095 m).

Substituting the values into the formula, we get:

E_point = (8.99 × 10⁹ N m²/C) * |-3.00 × 10⁶ C| / (0.095 m)²

E_point = 2.85 × 10⁷N/C

2. Electric field due to the charge density in the solid:

The electric field at a point inside the solid due to the charge density can be calculated using the formula:

E_density = (k * ρ * r) / (3ε0)

where

E_density is the electric field due to the charge density,

ρ is the charge density (7.35 × 10^(-4) C/m³),

r is the distance from the center of the cavity to the point inside the solid (9.50 cm = 0.095 m),

and ε0 is the permittivity of free space (8.85 × 10⁻¹² C²/N m²).

Substituting the values into the formula, we get:

E_density = [(8.99 × 10⁹N m²/C²) * (7.35 × 10⁻⁴C/m³) * (0.095 m)] / (3 * 8.85 × 10⁻¹² C²/N m²)

E_density = 1.06 × 10^8 N/C

3. Total electric field inside the solid:

To find the total electric field at the given point inside the solid, we need to sum the contributions from the point charge and the charge density. Since the charges have opposite signs, we subtract the magnitudes:

E_total = |E_point| - |E_density|

E_total = 2.85 × 10⁷N/C - 1.06 × 10⁸N/C

E_total = -7.78 × 10⁷N/C

However, the electric field is a vector quantity, and its direction is radial, pointing from the center of the cavity towards the point inside the solid.

Therefore, the magnitude of the electric field inside the solid at a distance of 9.50 cm from the center of the cavity is:

|E_total| = 7.78 × 10⁷N/C

The magnitude of the electric field inside the solid at a distance of 9.50 cm from the center of the cavity is 5.68 × 10

To know more about field visit:

https://brainly.com/question/19878202

#SPJ11

Answer:

for one they will stay there. And another thing it will do is collect rust pretty much destroying it.

Explanation:

A. The magnitude of the electric field in the region r ≤ a is zero.

B. The magnitude of the electric field in the region a < r < b is zero.

C. The magnitude of the electric field in the region r ≥ b is Q/ε₀, where ε₀ is the permittivity of free space.

D. The charge on the inside surface of the hollow sphere is +Q.

E. The charge on the exterior surface of the hollow sphere is +2Q.

A. To determine the magnitude of the electric field in the region r ≤ a (inside the hollow sphere), we need to consider the superposition of electric fields from the point charge at the center and the hollow sphere.

The electric field inside a conducting hollow sphere is zero. This means that the electric field due to the hollow sphere cancels out the electric field due to the point charge at the center.

Therefore, the magnitude of the electric field in the region r ≤ a is zero.

B. In the region a < r < b (between the inner and outer radii of the hollow sphere), the electric field is zero because the charge on the inner surface of the hollow sphere distributes itself uniformly on the inner surface, creating an electric field that cancels out the electric field from the point charge at the center.

Therefore, the magnitude of the electric field in the region a < r < b is zero.

C. In the region r ≥ b (outside the hollow sphere), we only have the electric field due to the point charge at the center. The magnitude of the electric field from a point charge is given by Coulomb's Law:

E = k * (|Q| / [tex]r^{2}[/tex]),

where E is the electric field, k is the electrostatic constant (k = 8.99 × [tex]10^{9}[/tex] N [tex]m^{2}[/tex]/[tex]C^{2}[/tex]), |Q| is the magnitude of the charge, and r is the distance from the point charge.

Substituting the given values:

E =  k * (|Q| / [tex]r^{2}[/tex]),

=  k * (Q / [tex]r^{2}[/tex]),

where we consider the magnitude of the charge |Q| = Q.

Therefore, the magnitude of the electric field in the region r ≥ b is Q/ε₀, where ε₀ is the permittivity of free space.

D. The charge on the inside surface of the hollow sphere is equal to the charge of the point charge at the center, +Q. This is because in electrostatic equilibrium, the charge resides on the outer surface of a conductor, and there is no electric field inside a conductor.

Therefore, the charge on the inside surface of the hollow sphere is +Q.

E. The charge on the exterior surface of the hollow sphere is equal to the charge of the hollow sphere, which is +2Q. This is because the charge on a hollow conductor resides entirely on its outer surface.

Therefore, the charge on the exterior surface of the hollow sphere is +2Q.

To know more about magnitude of the electric field here

https://brainly.com/question/28561944

#SPJ4

The vertical and horizontal centers of mass of the disk with the hole are both located at a distance of zero from the center of the disk.

Part (a) The vertical center of mass of the disk with the hole will be located at the same height as the center of the original disk, which is the same as the height of the center of the hole.

Therefore, the vertical center of mass of the disk with the hole is located at a distance of zero from the center of the disk.

Part (b) The horizontal center of mass of the disk with the hole will be located at the same horizontal position as the center of the original disk, since the hole is symmetrically placed with respect to the center.

Therefore, the horizontal center of mass of the disk with the hole is located at a distance of zero from the center of the disk.

Part (c) The total mass of the disk with the hole can be calculated by subtracting the mass of the removed portion (the hole) from the mass of the original disk.

The mass of the original disk is equal to its area multiplied by the area density, σ. The area of a circle is given by πR^2, so the mass of the original disk is πR^2σ.

The mass of the removed portion is equal to the area of the hole (πr^2) multiplied by the area density, σ. Therefore, the total mass of the disk with the hole is:

M = πR²σ - πr²σ

 = σπ(R² - r²)

Part (d) The horizontal center of mass of the disk with the hole can be calculated using the concept of moments.

The moment of an infinitesimally small element of mass, dm, about a reference point is given by dm * r, where r is the perpendicular distance from the reference point to the element of mass.

To find the horizontal center of mass, we need to calculate the sum of these moments for all the infinitesimally small elements of mass in the disk and divide it by the total mass.

In this case, the reference point is the center of the disk. Since the hole is centered at the same point, the perpendicular distance, r, for all the elements of mass is zero.

Therefore, the moment for each element of mass is zero. As a result, the horizontal center of mass of the disk with the hole is also located at a distance of zero from the center of the disk.

Part (e) The center of mass of the disk with the hole coincides with the center of the disk in both the vertical and horizontal directions. Therefore, the position of the center of mass from the center of the disk is (0, 0) cm.

In conclusion, the vertical and horizontal centers of mass of the disk with the hole are both located at a distance of zero from the center of the disk.

The total mass of the disk with the hole can be expressed as M = σπ(R² - r²). The position of the center of mass from the center of the disk is (0, 0) cm.

To know more about mass visit:

https://brainly.com/question/28021242

#SPJ11

Answer:

80 feet per mile

Explanation:

Given that a the elevation of the head of a stream is at 900 feet, and the elevation of the mouth of the stream is 500 feet, and the distance between the two points is 20 miles, and the meandering stream flows 25 miles between those points, what is the gradient of the stream?

The gradient will be calculated by using the formula

M = change in feet ÷ change in miles

Where

M = gradient of the stream.

Change in feet = 900 - 500 = 400 feet

Change in miles = 25 - 20 = 5 miles

M = 400 / 5

M = 80

Therefore, the gradient of the stream is 80 ft per mile