A student determines the centre of mass of a piece of card. Fig. 3.1 shows the equipment the student uses.
Describe how the student determines the centre of mass of the card using the equipment in Fig. 3.1.

The set or star-position measurements taken six months apart is most likely to reveal the highest parallax change for close stars.

The basic units of length & distance measurements inside the English system are the inch, yard, yard, and mile. Other length measurements include a rod, furlong, and chain.

The three most common fundamental units in the metric system are the meter, gram, and liter. A liter is a unit in volume equal in 3.28 meters, the meter is a length measurement equal to 3.28 feet, and the gram is just an unit of matter equal to approximately 0.0022 pounds (or about the mass of the a paper clip).

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Answer:

build the resilience of the society physically, socially and economically.

Explanation:

They actually build the resilience of the society , physically or socially or economically All three .

The projectile will take 6 seconds to return to the same level it was launched if it is launched at 50 m/s at 37 degrees from the horizontal.

Time taken by projectile to cover entire trajectory is called "Time of flight".

Suppose the initial velocity is u = [tex]v_{0[/tex] sin Ф

Let the Time of flight is T

As the projectile is reaching the same level of projection, vertical displacement is  y=0

we have, s= u t +1/2 a[tex]t^{2}[/tex]

0= [tex]v_{0[/tex] sinФT- 1/2 g[tex]T^{2}[/tex]

0= [tex]v_{0[/tex] sinФ- 1/2 gt

so, T = 2[tex]v_{0[/tex] sinФ/g

Putting values in this formula, we have

T= 2×30/10

T= 6 s

So, Time of flight is 6 seconds.

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Mostly on density and pressure of the gas sample, doubles remain the same.

Both freezing and boiling temperatures of water serve as the foundation for the two most popular test temperatures, Celsius (C) or Fahrenheit (F). There are 100 steps between the two locations on the Celsius scale and 180 on the Fahrenheit scale. Additionally, scientists employ the Kelvin units of the International System (K).

Definition. The entire energy of all internal molecular motion makes up an object's heat. The heat conduction or average temperature of a molecules within a substance is measured by temperature. S.I. Unit.

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Answer:

The tendency of a dog to bark defines entirely on the type of environment and the situation the dog looks at. Hence the correct answer is option.

Answer:

[tex]v_c_a_n_o_e=-1.6m/s^{2}[/tex]

Explanation:

You can use the equation of the conservation of momentum. We find that the velocity of the canoe is -1.6m/s².

[tex]m_1v_1+m_2v_2=0\\(49)(1.5)+(46)(v_c_a_n_o_e)=0\\73.5 + 46v_c_a_n_o_e=0\\46v_c_a_n_o_e = -73.5\\v_c_a_n_o_e = -73.5/46 = -1.6m/s^{2} \\[/tex]

(a) ratio = 0.32 One the average current with in primary coil of the tranformer.

(b) The load current is 753.6 volts, and the transformer's required turn ratio is 12. The mean load current is 12.

Charge moves across a point on such a circuit at a rate known as current. When numerous coulombs of charge pass over a wire's cross section in a circuit, a large current is the result. It is not necessary to have a fast speeds to have a large current if the positive ions are tightly packed inside the wire.

Source = 240Vrms/ 60Hz

Resistor = 20 ohm

Avg. load current = voltage/ resistance * pi

= 12A times (20*3.14)

load current = 753.6 volts

ratio = Vp/Vs

ratio = 240/754

ratio = 0.32 A

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Answer:

2kg

Explanation:

F= ma

F = 0.5N and a = 0.25m/s²

m = F/a

= 0.5/ 0.25

= 2kg

The weight of (i.e. the force of gravity on)  9 kg satellite that is at a distance 2r above the surface of the earth is calculated as 9.79 N.

In science and engineering, the weight of an object is defined as the force acting on the object due to gravity. It is a standard mechanical quantity but sometimes, it can be defined as a vector quantity, the gravitational force acting on the object.

Given m= 9kg  g = 9.8m/s²

As we  know, Weight, W = m* a

Acceleration due to gravity at height 2r; h = 2r

a =g r²/(r+ h)²

= gr²/( r+ 2r)²

= gr²/9r²

=g/9

=9.8/9

= 1.088 m/s²

W = m* a

W= 9 * 1.088

Weight = 9.79 N.

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The magnitude of gopher's velocity as it reaches the ground is 22.18 m/s.

Given that, velocity of the eagle u = 10 m/s

Height x = 20 m

From one of the equations of motion, we know, v² - u² = 2 * a * s

Here, s is the height (x)

u is the initial velocity

a is the acceleration due to gravity

v is the velocity of the gopher as it reaches the ground

v² = u² + 2 a * x

v = √(u² + 2 a * x)

v = √( 10² + 2 * 9.8 * 20) = 22.18 m/s

Thus, the velocity of the gopher as it reaches the ground is 22.18 m/s.

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Hello,

I hope you and your family are doing well!

Newton's Second Law of Motion states that the force produced by an engine is equal to the mass of the rocket times its acceleration. The greater the force produced by the engine, the greater the acceleration of the rocket.

Please rate this 5 stars and brainliest if you find it helpful.

Happy Holidays!

In the simulation, an oxygen atom by itself doesn't exist. There are always two atoms of oxygen.

A single water molecule is quite tiny. Since humans are unable to see or feel a single molecule, we are unable to measure or otherwise handle it in the laboratory.

Molecules are created when atoms come together. Two hydrogen (H) atoms and one oxygen (O) atom make up the three atoms that make up a water molecule. Because of this, water is occasionally abbreviated as H2O. There are billions of water molecules in a single drop of liquid.

Despite being the most prevalent substance on earth, water is rarely encountered in its purest form in nature. Usually, pure water needs to be produced. Distilled water or deionized water are two names for pure water. In distilled water, evaporation has evaporated away every dissolved ingredient that was previously present in the water.

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The formula of chromium oxide, which is formed when a chromium ion with a 3+ charge combines with an oxygen ion with a 2- charge be Cr₂O₃.

A chemical formula is a formula that indicates the number of atoms of one or more specific elements are present in a given chemical composition. The amount of each specific atom present in the chemical compound is indicated by the numbers that appear as subscripts on certain symbols inside the formula.

In the question, we have chemical compound named chromium oxide, which is formed when a chromium ion with a 3+ charge combines with an oxygen ion with a 2- charge. So, its chemical formula be Cr₂O₃.

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The stars of the milky way are all near a great circle on the celestial sphere. This great circle is called milky circle.

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The stars of the milky way are all near a great circle on the celestial sphere. This great circle is called milky circle.

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The intensity reflects 95% of the critical reading scores is 430 t 230.

What is intensity?

intensity is the period of time between two points.

As per the given scenario

95% confidence intervals

(Mu - 6.7-Mu+6.7)

(430-115×2 , 430+115×2)

By adding or substracting

( 430-230, 430+230)

So interval (430±230)

Thus,

The interval= 430±230.

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19.15 feet is the distance the car travel in that time when a car traveling at 80 feet/sec decelerates at a constant rate so that it comes to a complete stop after 30 seconds.

To find the constant deceleration rate we use a = Δv/Δt.

a=80feet/sec/30s

a=-2.66 m/s^2

now to find the distance travelled

s =  80*-2.66 *30^2 =19.15 feet    (where s= distance)

Hence,19.15 feet is the distance the car travel in that time when a car traveling at 80 feet/sec decelerates at a constant rate so that it comes to a complete stop after 30 seconds.

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When you check your credit score for incorrect information, you are checking the veracity of the information.

option C is the correct answer.

Veracity is a word that describes the quality of being true, honest, or accurate.

Veracity also entails the conformity with truth or fact. It shows the validity of information or fact.

From the given question, when you check your credit score for incorrect information you are checking the veracity of such information or the conformity with truth or fact about the credit score.

Thus, we can conclude that veracity entails the truth, validity or conformity of information with proven truth.

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The position of center of mass will be x = (x₁m₁ + x₂m₂) / m₁ + m₂

The center of gravity of a body or system of particles is defined as the point at which the entire mass of the body or all the masses of the system of particles appeared to be concentrated.

In physics, we can say that the center of mass is the point at the center of the distribution of mass in space (also known as the equilibrium point) where the weighted relative position of the distributed mass sums to zero.

where, x₁ and x₂ are the positions of the objects and m₁ + m₂ are the masses of the objects respectively.

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At reach point 2, the speed V is equal to 24.9 m/s if the average friction force is equivalent to 0.15 of the its weight.

A force that opposes the rolling or sliding of three stationary surfaces over one another. Although frictional forces, such the traction required to walk without falling, may be advantageous, they can provide a significant amount of resistance to motion. the physical contact of two bodies.

The interaction of a car's tires with the road causes friction, specifically three types of friction: rolled friction, starting turbulence, and sliding friction. This friction is what allows humans to operate cars at all.

speed= 1.5m/s

The Initial speed u = 1.5m/s.

point 1 $ point 2 is (39-13) =26m

40 meters is equivalent to an altitude of(40/6) =6.7

kinematics equation v^2 =u^2 + 2as

V^2 = 1.5^2 + 2*9.8 (26 + 6.7)

V = 24.9 m/s

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Answer:

20.41m

Explanation:

v1=20 m/s

30°

-assuming flat ground and no friction forces acting-

[tex]vf^{2}[/tex][tex]=vi^{2} +2a[/tex]Δx ⇒ Δx[tex]= vf^{2} -vi^{2} /2a[/tex]

[tex]0^{2} -20^{2} /2(-9.8)[/tex]

[tex]400/19.6[/tex]

[tex]=20.408[/tex]⇒[tex]20.41 m[/tex]

Race car is going at a speed of 94.05 km/hr. , when frequency and revolutions are given.

The number of occurrences of a repeating event per unit of time is called as frequency . It is also referred to as temporal frequency and is distinct from angular frequency. Frequency is measured in hertz.

Given frequency is 548 Hz and 2622 rev/km

Frequency of sound produced by each piston= 548/8

= 68.5 Hz

Each cylinder makes sound every 2 revolutions,  therefore for a piston to have 68.5 Hz frequency, it undergoes 137 rev/sec

V= (68.5 rev/sec)/(2622rev/km) * (1000m/1km)

= 26.125 m/s

V = 94.05 km/hr.

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The acceleration is precisely equal to the product of the acceleration due to gravity and the coefficient of kinetic friction.

The rate at which an object's velocity with respect to time changes is known as its acceleration. Accelerations are vector quantities. The direction of the net force acting on an object determines its acceleration.

The ratio of the frictional resistive force to the perpendicular force pushing the objects together is known as the coefficient of friction. The formula for the coefficient of friction is μ = F N, where F denotes the frictional force and N is the normal force.

It deals with the forces and energies involved in the motion of material bodies.

Hence, the acceleration is precisely equal to the product of the acceleration due to gravity and the coefficient of kinetic friction.

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Ratio of distances of image and object respectively = ratios of heights of image and objects respectively

This implies

(1.7/600) = (x/1) ........ ( X is largeness of letter on retina)

x= 0.002833333 cm

What is retina?

The retina is the innermost, light-sensitive layer of eye tissue in most vertebrates and some mollusks. The optics of the eye create a focused two-dimensional image of the visual world on the retina. The retina processes that image within the retina, sending nerve impulses along the optic nerve to the visual cortex to produce vision. The retina functions in many ways similar to the film and image sensors in cameras.

The neural retina consists of several layers of neurons connected by synapses and supported by an outer layer of pigment epithelial cells. The main light-sensitive cells in the retina are photoreceptor cells, of which there are two types: rods and cones. Rods work primarily in low light and provide monochromatic vision. Cones function in bright environments, use different opsins to perceive color, and are responsible for sharp vision used for tasks such as reading. A third type of photosensitive cell, the photosensitive ganglion cell, is important in entrainment of circadian rhythms and reflex responses such as the pupillary light reflex.

Therefore, x= 0.002833333 cm

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Answer:

3924 Joules

Explanation:

Potential Energy is calculated with the formula:

PE = mgh

From the problem m=200kg and h=2m so the gain in PE when the weights are lifted is 200*(9.81)*2 = 3924 J

Answer:

To construct an electric circuit to light a bulb with maximum brightness, you will need to follow these steps:

1) Assemble the materials: Gather the two dry cells, two bulbs, and the conducting wire.

2) Connect the cells: Place the two dry cells side by side, making sure that the positive terminal of one cell is connected to the negative terminal of the other cell. This will create a series circuit.

3) Connect the bulbs: Attach one end of a length of conducting wire to the positive terminal of one of the dry cells. Connect the other end of the wire to the base of one of the bulbs. Then, attach another length of conducting wire to the base of the first bulb and connect the other end to the negative terminal of the other dry cell.

4) Test the circuit: Touch the base of the second bulb with one hand and the negative terminal of the second dry cell with the other hand. If the bulb lights up, the circuit is complete. If it does not, check the connections to make sure they are secure and that the bulbs are functioning properly.

5) Adjust the brightness: If the bulb is not as bright as you would like, you can try using a different bulb or adding additional cells to the circuit to increase the current. Be aware that adding too many cells can cause the bulb to burn out or create a hazard, so use caution when adjusting the brightness.

In order to build an electric circuit that will light a bulb as brightly as possible, you must do the following steps: Gather the components: assemble the conducting wire, two bulbs, and two dry cells.

Join the cells, and align the positive terminal of one cell with the negative terminal of the other cell by placing the two dry cells side by side.

Connect the bulbs join the positive terminal of one of the dry cells to one end of a piece of conducting wire.

Modify the brightness: If the light isn't as bright as you'd want it to be, you may try using a different bulb or expanding the circuit with more cells to boost current.

Therefore, bright as you'd want it to be, you may try using a different bulb or expanding the circuit.

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The direction of the force of sliding friction is always that of velocity of the object.

Moving against the surface's normal, the force of sliding friction acts in a direct proportion to the weight.

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Answer: 0.18 m/s

Explanation:

This is a conservation of momentum problem.  Total momentum before the collision must equal the total momentum after the collision.  

Momentum = p = mv

let x = velocity of the second marble after the collision

(0.15 kg)(2.5 m/s) + (0.25 kg)(-3.0 m/s) = (0.15 kg)(-2.8 m/s) + (0.25 kg)(x)

-0.375 kg·m/s = -0.42 kg·m/s + (0.25 kg)x

(0.25 kg)x = (0.42 - 0.375) kg·m/s =  0.045 kg·m/s

x =  (0.045 kg·m/s) / (0.25 kg) = 0.18 m/s

Only gravity acceleration is needed.

If we let gravity be g

I will rename M1 as M₁ for the first mass

I will rename M2 as M₂ to further reduce the possible confusion of a subscript with a multiplicand.

The tension in the string will support the weight of M₂ and will supply the centripetal force required to keep M₁ on a circular path:

M₁v²/R = M₂g

v = √(M₂gR/M₁)

A object of mass M1 travels in a circular path of radius R on a horizontal table. The object is attached to a string that passes through a hole in the center of the table.  An object of mass M2 is attached to the other end of the strings and hangs vertically under the table, which produces a force on M1. All frictional forces are considered to be negligible.

Therefore, Only gravity acceleration is needed.

If we let gravity be g

I will rename M1 as M₁ for the first mass

I will rename M2 as M₂ to further reduce the possible confusion of a subscript with a multiplicand.

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The block requires the smallest applied force to keep it moving at constant velocity is copper = 0.36. Hence option c is correct.

Velocity is defined as the speed of change in the object's position relative to time and a frame of reference. A specification of a thing's speed and direction of motion is what velocity is.

The force of friction and the applied (horizontal) force must be different for an object to accelerate or decelerate, and they must be equal for it to move at a constant speed.

Thus, the block requires the smallest applied force to keep it moving at constant velocity is copper = 0.36. Hence option c is correct.  

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Your question is incomplete, but probably your complete question was

A 10 kilogram block of each of these materials is pulled horizontally across a steel floor at a constant velocity. Which block requires the smallest applied force to keep it moving at a constant velocity?

Al = 0.47

brass= 0.44

copper = 0.36

steel = 0.57