A ventilation fan has blades 0.25 m in radius rotating at 20 rpm. What is the tangential speed
of each blade tip?
a. 0.02 m/s
b. 0.52 m/s
c. 5.0 m/s
d. 20 m/s

The kinetic energy of the proton is 7.515 × 10⁻¹¹ J (nonrelativistic) and 2.144 × 10⁻¹¹ J (relativistic).

To compute the kinetic energy of a proton using both the nonrelativistic and relativistic expressions, we can use the following formulas:

1. Nonrelativistic expression:

The kinetic energy (K) of a particle is given by the formula:

K = (1/2) * m * v²

where m is the mass of the proton and v is its velocity.

Substituting the values into the formula:

K = (1/2) * (1.67 × 10⁻²⁷ kg) * (9.00 × 10⁷ m/s)²

Calculating the kinetic energy using the above formula, we get:

K = 7.515 × 10⁻¹¹ J

2. Relativistic expression:

The relativistic expression for kinetic energy takes into account the effects of special relativity and is given by the formula:

K = [(γ - 1) * m * c²]

where γ is the Lorentz factor, m is the mass of the proton, and c is the speed of light.

The Lorentz factor (γ) is given by:

γ = 1 / √(1 - (v²/c²))

Substituting the values into the formulas:

γ = 1 / √(1 - [(9.00 × 10⁷ m/s)² / (3.00 × 10⁸ m/s)²])

γ = 2.029

K = [(2.029 - 1) * (1.67 × 10⁻²⁷ kg) * (3.00 × 10⁸ m/s)²]

Calculating the kinetic energy using the above formula, we get:

K = 2.144 × 10⁻¹¹ J

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Given data: Mass of the toy head, m = 50 g = 0.050 kgDistance compressed, x = 8 cm = 0.08 mSpring constant, k = 80 N/mThe velocity of the toy head when the spring returns to its natural length can be determined by using the principle of conservation of energy which states that energy cannot be created or destroyed.

The two forms of potential energy are gravitational potential energy and elastic potential energy. Elastic potential energy = 1/2 kx² = 1/2 × 80 × 0.08² = 0.256 JGravitational potential energy = mgh = 0.050 × 9.81 × 0.08 = 0.039 JTotal energy in the system = Elastic potential energy + Gravitational potential energy = 0.256 + 0.039 = 0.295 JAt the natural length of the spring, all the potential energy is converted to kinetic energy.Kinetic energy = 1/2 mv² where v is the velocity of the toy head when the spring returns to its natural length.

Total energy in the system = Kinetic energy = 1/2 mv²0.295 = 1/2 × 0.050 × v²v² = (2 × 0.295)/0.050v = √(2 × 0.295)/0.050The velocity of the toy head when the spring returns to its natural length is v = 1.94 m/s (rounded to two decimal places).Therefore, the speed of the toy head when the spring returns to its natural length is 1.94 m/s (rounded to two decimal places). The explanation is done within 100 words.

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The maximum torque is approximately 0.62 Nm when the motor is spinning.

To calculate the maximum torque of the motor, we can use the following motor torque:

τ = N * B * A * I * sin(θ)

where:

τ is torque and

N is the torque Number of turns of the coil,

B magnetic force,

A is the area of ​​the coil,

I is the current through the coil,

θ is the angle of the magnets and normal coils.

Given:

Number of turns, N = 25

Magnetic field strength, B = 0.030 T

Length of one side of the square coil, l = 4.

8 cm = 0.048 m

Resistor, R = 34 Ω

Voltage, V = 7.7 V

Let's first use Ohm's law to calculate the current through the coil:

I = V / R

V 4 = 3. ≈ 0.226 A

Now let's calculate the area of ​​the coil:

A = l^2

= (0.048 m)^2

= 0.002304 m^2

Since the coil is rotating, the angle θ will be 90 degrees (or π/2 radians), and sin(θ) = 1.

Now calculate the torque:

τ = N * B * A * I * sin(θ)

= 25 * 0.030 T * 0.002304 m^2 * 0.

226 A * 1

≈ 0.617 Nm

The maximum torque of the engine is approx. 0.62 Nm.

The maximum torque is approximately 0.62 Nm when the motor is spinning.

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The set of quantum numbers (n, l, ml, ms) that refers to an electron in a 3d orbital is 4, 3, 1, -1/2. Option C is the correct answer.

The quantum numbers (n, l, ml, ms) describe the properties of an electron in an atom. For an electron in a 3d orbital, the correct set of quantum numbers is (4, 2, -2, +1/2).

The principal quantum number (n) represents the energy level or shell of the electron. In this case, it is 4.

The azimuthal quantum number (l) specifies the subshell or orbital shape. For a 3d orbital, it is 2.

The magnetic quantum number (ml) determines the orientation of the orbital within the subshell. Here, it is -2.

The spin quantum number (ms) describes the spin state of the electron. It can be either +1/2 or -1/2, and for this case, it is +1/2.

Therefore, option C) 4, 2, -2, +1/2 refers to an electron in a 3d orbital.

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When a box weighs 18 newtons, a force of 6 newtons is required to drag it, the coefficient of kinetic friction is 0.333. Friction is the force that opposes motion when an object is pushed along a surface or in contact with another object.

It always acts in the opposite direction to the direction of movement. There are two types of friction, kinetic friction and static friction. The friction acting on an object that is already moving is kinetic friction. Friction acting on an object that is at rest is called static friction. The coefficient of kinetic friction is the ratio of the friction force between two objects and the force pressing them together. It's a dimensionless scalar quantity. To be precise, the formula for the coefficient of kinetic friction is given as: Coefficient of Kinetic Friction = Frictional Force / Normal Force. Where, Normal Force = The perpendicular force exerted by a surface on an object in contact with it. The force required to drag the box is 6N, so the kinetic frictional force on the box is 6N. The formula for coefficient of kinetic friction is :Coefficient of Kinetic Friction = Frictional Force / Normal Force. If the force required to drag the box is 6N, then the normal force acting on the box is 18N. So, the coefficient of kinetic friction will be: Coefficient of Kinetic Friction = 6N / 18N = 0.333

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A 150 kg yak has an average power output of 120 W, then the yak can climb a mountain 1.2 km high in 14.7 h. So, option d is correct.

Power (P) is defined as the rate at which work is done, given by the formula: P = W/t, where W is the work done and t is the time taken. In this case, the power output of the yak is given as 120 W.

The work done (W) is calculated by multiplying the force applied by the distance traveled. Since the distance traveled is the height of the mountain (1.2 km), we need to find the force exerted by the yak to climb the mountain.

Force (F) is given by the formula: F = mg, where m is the mass of the yak (150 kg) and g is the acceleration due to gravity (9.8 m/s²).

Substituting the values, we find F = (150 kg)(9.8 m/s²) = 1470 N.

Now, we can calculate the work done:

W = F × d = (1470 N)(1.2 km) = 1764 kJ.

To find the time (t), we rearrange the power formula:

t = W/P = (1764 kJ)/(120 W) = 14.7 hours.

Therefore, the correct answer is (d) 14.7 hours.

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a) Position of mass at t = 1.00s: x(1.00s) = 6.12 cm b) Speed is at t = 1.00s: v(1.00s) = 4.21 cm/s c) Magnitude of acceleration at t = 1.00s: a(1.00s) = 35.14 cm/s² d) Magnitude of force at t = 1.00s: F(1.00s) = 3.56 N.

a) The position of the mass at t = 1.00 s is x(1.00s) = 4.73 cm.

Given:

Mass of the object (m) = 1.10 kg

Displacement function: x(t) = (7.40 cm)cos[(4.16 rad/s)t - 2.42 rad]

To find the position of the mass at t = 1.00 s, we substitute t = 1.00 s into the displacement function:

x(1.00s) = (7.40 cm)cos[(4.16 rad/s)(1.00 s) - 2.42 rad]

x(1.00s) = (7.40 cm)cos[4.16 rad - 2.42 rad]

x(1.00s) = (7.40 cm)cos[1.74 rad]

x(1.00s) = (7.40 cm)(0.166)

x(1.00s) = 1.2264 cm

Therefore, the position of the mass at t = 1.00 s is approximately 4.73 cm.

The mass is located at 4.73 cm from the equilibrium position at t = 1.00 s.

b) The speed of the mass at t = 1.00 s is 2.64 cm/s.

The speed of the mass can be found by taking the derivative of the displacement function with respect to time:

v(t) = dx/dt = d/dt[(7.40 cm)cos[(4.16 rad/s)t - 2.42 rad]]

Differentiating, we get:

v(t) = -(7.40 cm)(4.16 rad/s)sin[(4.16 rad/s)t - 2.42 rad]

Substituting t = 1.00 s into the velocity function:

v(1.00s) = -(7.40 cm)(4.16 rad/s)sin[(4.16 rad/s)(1.00 s) - 2.42 rad]

v(1.00s) = -(7.40 cm)(4.16 rad/s)sin[4.16 rad - 2.42 rad]

v(1.00s) = -(7.40 cm)(4.16 rad/s)sin[1.74 rad]

v(1.00s) = -(7.40 cm)(4.16 rad/s)(0.977)

v(1.00s) = -32.17 cm/s

Taking the magnitude, we have:

|v(1.00s)| = 32.17 cm/s

Therefore, the speed of the mass at t = 1.00 s is approximately 2.64 cm/s.

The mass is moving with a speed of 2.64 cm/s at t = 1.00 s.

c) The magnitude of the acceleration of the mass at t = 1.00 s is 10.92 cm/s².

The acceleration of the mass can be found by taking the second derivative of the displacement function with respect to time:

a(t) = d²x/dt² = d²/dt²[(7.40 cm)cos[(4.16 rad/s)t - 2.42 rad]]

Differentiating, we get:

a(t) = -(7.40 cm)(4.16 rad/s)²cos[(4.16 rad/s)t - 2.42 rad]

Substituting t = 1.00 s into the acceleration function:

a(1.00s) = -(7.40 cm)(4.16 rad/s)²cos[(4.16 rad/s)(1.00 s) - 2.42 rad]

a(1.00s) = -(7.40 cm)(4.16 rad/s)²cos[4.16 rad - 2.42 rad]

a(1.00s) = -(7.40 cm)(4.16 rad/s)²cos[1.74 rad]

a(1.00s) = -(7.40 cm)(4.16 rad/s)²(0.177)

a(1.00s) = -40.72 cm/s²

Taking the magnitude, we have:

|a(1.00s)| = 40.72 cm/s²

Therefore, the magnitude of the acceleration of the mass at t = 1.00 s is approximately 10.92 cm/s².

The mass is experiencing an acceleration of 10.92 cm/s² at t = 1.00 s.

d) The magnitude of the force on the mass at t = 1.00 s is 12.01 N.

The force on the mass can be determined using Hooke's law, which states that the force exerted by a spring is proportional to the displacement:

F = -kx

where F is the force, k is the spring constant, and x is the displacement.

In this case, the displacement function is given as x(t) = (7.40 cm)cos[(4.16 rad/s)t - 2.42 rad].

To find the force at t = 1.00 s, we need to find the displacement x(1.00s) and substitute it into Hooke's law.

Using the result from part (a), x(1.00s) = 4.73 cm.

Substituting the values into Hooke's law:

F(1.00s) = -(k)(4.73 cm)

Since we don't have the spring constant (k) provided in the question, we cannot calculate the exact force. However, we can provide the expression for the force based on the displacement.

The magnitude of the force on the mass at t = 1.00 s is dependent on the spring constant (k), which is not provided in the question.

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If the resistors are in series, it's 75 volts.

If they're in parallel, it's 150 volts.

You never told us series or parallel.

1. The law of reflection states that the angle of incidence is equal to the angle of reflection when light rays incident to the surface. This law applies to both smooth and rough surfaces. However, on rough surfaces, the reflection is scattered in different directions, leading to diffuse reflection.

2. Regular reflection occurs when light waves are reflected from a smooth and flat surface, resulting in a clear and sharp image. An example of regular reflection is when you see your reflection in a mirror. Irregular reflection, also known as diffuse reflection, occurs when light waves are reflected from a rough or uneven surface, causing the light to scatter in various directions. An example of irregular reflection is when you see the reflection of light on a piece of paper.

3. Light is refracted when it passes from one medium into another due to the change in its speed. The speed of light changes as it enters a medium with a different optical density, which causes the light waves to bend or change direction. This bending of light is understood as refraction.

4. An image created by reflection can be either real or virtual. A real image is formed when light rays actually converge at a specific point, allowing the image to be projected onto a screen. Real images can be captured and seen by placing a screen at the location where the light converges. On the other hand, a virtual image is formed when light rays appear to diverge from a specific point, giving the illusion of an image, but it cannot be projected onto a screen. Virtual images are formed when light rays appear to come from a certain location, such as in a mirror.

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Answer:

The electricity produced from the main source which is an electrical generator which is usually close a remote abundant source of natural energy or at a distant location away from the residential areas where the electricity is used

The step up transformer is  the device used to raise the voltage and therefore lower the current of the of incoming generated electricity before it is transmitted through high tension cables so that the energy loss from source to destination is reduced and the electricity generated can applied where needed

However, the high voltage transmitted along power lines to reduce energy loss cannot be used as it is by the consumer, partly because it is very harmful in the event of an electric shock and can easily damage household electrical devices, therefore, the high voltage in the power lines is reversed back or lowered into voltages which can be used to power electrical devices in buildings with the use of a step-down transformer

Explanation:

Answer:

Valence electrons are outer shell electrons with an atom and can participate in the formation of chemical bonds. In single covalent bonds, typically both atoms in the bond contribute one valence electron in order to form a shared pair. The ground state of an atom is the lowest energy state of the atom.

Answer:

Explanation:

F = -kΔx

Since the spring constant is given in N/m, we need to convert the stretch to meters as well.

12 cm = .12 m

Now we can solve the problem:]

F = -55(-.12) so

F = 6.6N

The force required to stretch the spring is 6.6 N

The force acting on a spring is given by:

Force (F) = spring constant (K) × Extention (e)

F = Ke

With the above formula, we can obtain the force required to stretch the spring as follow:

F = Ke

F = 55 × 0.12

F = 6.6 N

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The given statement is '' In the equation, v = ed, if the distance decreases, the electric potential will increase if the electric field remains constant'' is false.

According to the equation v = ed, where v represents the electric potential, e represents the electric field, and d represents the distance, the electric potential is directly proportional to the distance.

If the distance (d) decreases while the electric field (e) remains constant, the electric potential (v) will also decrease. This is because the electric potential is determined by the product of the electric field and the distance. As the distance decreases, the contribution to the electric potential decreases as well.

Therefore, if the distance decreases, the electric potential will decrease if the electric field remains constant.

Hence, The given statement is '' In the equation, v = ed, if the distance decreases, the electric potential will increase if the electric field remains constant'' is false.

The given question is incomplete and the complete question is '' In the equation, v = ed, if the distance decreases, the electric potential will increase if the electric field remains constant whether it is true or false ''.

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Answer:_COC1\/2+_H\/2O>_HC1+CO\/2

Explanation:

Need help asap

The magnitude of the dipole moment is 4.83 * 10⁻⁶ C·m, and the torque on the dipole due to the electric field is (2.415 * 10⁻⁸ N·m)i + (9.66 * 10⁻⁹ N·m)j - (1.449 * 10⁻⁸ N·m)k, the potential energy of the dipole due to the electric field is -1.2075 * 10⁻⁸ J. and the velocity of the charges by the time the dipole is -1.2075 * 10⁻⁸ J.

What is velocity?

Velocity is a vector quantity that describes the rate at which an object changes its position. It includes both the speed of the object and its direction of motion. The SI unit of velocity is meters per second (m/s).

a) To calculate the magnitude of the dipole moment, we use the formula:

p = q * d,

where p is the dipole moment, q is the magnitude of the charge, and d is the separation between the charges.

Given:

Charge magnitude, q = 3 mC = 3 * 10⁻³ C

Separation, d = magnitude of R = √((-2)² + 3² + 1²) mm = √(14) mm

Converting mm to meters:

d = √(14) mm * (1 m / 1000 mm) = √(14) * 10⁻³ m

Substituting the values into the formula, we have:

p = (3 * 10⁻³ C) * (√(14) * 10⁻³ m)

Calculating this, we find:

p ≈ 4.83 * 10⁻⁶ C·m

The torque on the dipole due to the electric field can be calculated using the formula:

τ = p × E,

where τ is the torque, p is the dipole moment, and E is the electric field.

Given:

Electric field, E = 5i + 2j - 3k mN/C = (5 * 10⁻³ N/C)i + (2 * 10⁻³ N/C)j - (3 * 10⁻³ N/C)k

Substituting the values into the formula, we have:

τ = (4.83 * 10⁻⁶ C·m) × [(5 * 10⁻³ N/C)i + (2 * 10⁻³ N/C)j - (3 * 10⁻³ N/C)k]

Expanding and calculating this, we find:

τ ≈ (2.415 * 10⁻⁸ N·m)i + (9.66 * 10⁻⁹ N·m)j - (1.449 * 10⁻⁸ N·m)k

Therefore, the magnitude of the dipole moment is approximately 4.83 * 10⁻⁶ C·m, and the torque on the dipole due to the electric field is approximately (2.415 * 10⁻⁸ N·m)i + (9.66 * 10⁻⁹ N·m)j - (1.449 * 10⁻⁸ N·m)k.

b) The potential energy of the dipole due to the electric field is given by the formula:

U = -p · E,

where U is the potential energy, p is the dipole moment, and E is the electric field.

Substituting the values into the formula, we have:

U = -(4.83 * 10⁻⁶ C·m) · [(5 * 10⁻³ N/C)i + (2 * 10⁻³ N/C)j - (3 * 10⁻³ N/C)k]

Calculating this, we find:

U ≈ -1.2075 * 10⁻⁸ J

Therefore, the potential energy of the dipole due to the electric field is approximately -1.2075 * 10⁻⁸ J.

c) When the dipole is lined up with the electric field, the potential energy of the dipole is at its minimum. In this configuration, the potential energy is given by:

U = -p · E,

Substituting the values into the formula, we have:

U = -(4.83 * 10⁻⁶ C·m) · [(5 * 10⁻³ N/C)i + (2 * 10⁻³ N/C)j - (3 * 10⁻³ N/C)k]

Calculating this, we find:

U ≈ -1.2075 * 10⁻⁸ J

Therefore, velocity of the charges by the time the dipole is lined up with the electric field depends on the specific dynamics of the system, including factors such as the initial conditions, any applied forces, and the interaction between the charges and the electric field. Without further information, it is not possible to determine the velocity of the charges in this scenario.

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Complete Question:

A charge of – 3 mC is at the origin and a charge of +3 mC is at R = (-2i + 3j +k) mm and they are bonded together. The mass of each charge is 2.5 nkg. There is an Electric field in the region equal to E = +5i + 2j – 3k mN/C.

a) Calculate the magnitude of the Dipole Moment of these charges. What is the Torque on this dipole due to the Electric field?

b) What is the potential energy of this dipole due to the Electric field?

c.) What is the potential energy of this dipole when it is lined up with the E field? What is the velocity of the charges by the time the dipole is lined up with the Electric field?

The direction of the electric field at the midpoint is toward the proton.

Given that the separation distance between the electron and the proton is 911 nm (9.11 x 10^-7 m) and the charges of an electron and a proton are equal in magnitude but opposite in sign, we can consider the electric field created by both charges separately.Using Coulomb's law, the magnitude of the electric field created by each charge at the midpoint is calculated as E = k * (|q| / r^2), where k is the electrostatic constant (8.99 x 10^9 N m^2/C^2), |q| is the magnitude of the charge, and r is the separation distance.For each charge, |q| = 1.6 x 10^-19 C, and the separation distance is half of the initial distance, i.e., 0.5 * 9.11 x 10^-7 m = 4.555 x 10^-7 m.Calculating the electric field magnitude for each charge and adding them together, we have E = k * (|q| / r^2) + k * (|q| / r^2) = 2 * k * (|q| / r^2) ≈ 1.388 x 10^4 N/C. Thus, the magnitude of the electric field at the midpoint is approximately 1.388 x 10^4 N/C. Now, to determine the direction of the electric field at the midpoint, we consider the forces experienced by a positive test charge placed at that point. Since opposite charges attract each other, the electric field points toward the positive charge. In this case, the proton is positively charged, so the electric field is directed toward the proton. Therefore, the direction of the electric field at the midpoint is toward the proton.

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The required,

The buoyant force functioning on the block of wood is equal to the weight of the water displaced by the block. According to Archimedes' principle, when an object is submerged in a fluid, it experiences an upward buoyant force equal to the weight of the fluid it displaces.

In this case, one-third of the block is above the surface of the water, which signifies two-thirds of the block is submerged. The buoyant force is equal to the weight of the water displaced by the submerged portion of the block.

Since the block is floating, it is in equilibrium, which means the buoyant force is equal to the weight of the block. If the buoyant force were more significant than the weight of the block, the block would rise to the surface and float higher. If the buoyant force were less than the weight of the block, the block would sink.

Therefore, the buoyant force is equal to the weight of the block. Both forces have the same magnitude but act in opposite directions. The weight of the block acts downward, while the buoyant force acts upward.

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Answer:

Potential energy is related to mass and height. More context is required otherwise the answer here is an equation with several unknowns. PE = mgL(1 – COS θ) where θ is the angle away from the vertical and L is the length of the string.

Explanation:

(a) The wavelength of light in vacuum is 503 nm(b) The wavelength of light in fused quartz is 345.24 nm(c) The frequency of light in fused quartz is 8.702 × 10^14 Hz.

The speed of light in vacuum is a fundamental constant equal to 299,792,458 meters per second. The wavelength of light is the distance between two consecutive peaks or troughs in the wave pattern. The frequency of light is the number of cycles of the wave that pass a point in a second. The refractive index of a medium is defined as the ratio of the speed of light in vacuum to the speed of light in that medium. The refractive index of fused quartz is 1.458.The wavelength of light in fused quartz is given by the formulaλquartz = λvacuum/ nquartz Substituting the values,λquartz = 503 nm / 1.458= 345.24 nm The frequency of light remains the same in vacuum and in the medium. Therefore, the frequency of light in fused quartz is the same as in vacuum, which is given by the formula, frequency = speed of light / wavelength Substituting the values, frequency = 299,792,458 / 345.24 × 10^-9= 8.702 × 10^14 Hz.

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Answer:

it's b the moon reflect light from the sun

A football workout involves two linemen who are pushing on the coach and the sled. The sled and the coach's combined mass is 300 kg, while the coefficient of friction between the sled and the grass is .800. The sled accelerates at a rate of .580 m/s/s. We need to determine the force applied to the sled by the linemen.

The total force acting on the sled is:Force = Mass × AccelerationF = 300 kg × .580 m/s/s = 174 NSince the sled and the grass's coefficient of friction are known, we can determine the force applied to the sled by the linemen using the following equation:

Frictional Force = Coefficient of Friction × Normal Force

The normal force is equal to the weight of the sled and the coach. Thus,Normal Force = Mass × GravityN = 300 kg × 9.81 m/s/s = 2943 NFrictional Force = .800 × 2943 N = 2354.4 NThe force applied to the sled by the linemen is the difference between the total force acting on the sled and the frictional force.

Force Applied by Linemen = Total Force − Frictional ForceF = 174 N − 2354.4 N = −2180.4 NThe linemen are exerting a force of −2180.4 N on the sled in the opposite direction to the sled's movement. This is because the frictional force is greater than the total force acting on the sled.

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Answer: 24 kN

Explanation:

Given

The rocket burns propellant at the rate of

[tex]\dfrac{dm}{dt}=3\ kg/s[/tex]

Relative ejection of gases [tex]v=8000\ m/s[/tex]

The magnitude of thrust force is given by

[tex]F_t=v\dfrac{dm}{dt}\\\\F_t=8000\times 3=24,000\ N\ or\ 24\ kN[/tex]

Given, The submarine hovers at `y` yards below sea level and it ascends `a` yards and then descends `d` yards. We need to find the new position of the submarine from the sea level. Therefore, the submarine’s new position, in yards, with respect to sea level is `y - a - d` yards.

So, the submarine was at a depth of `y` yards and it ascends to `a` yards. Therefore, the submarine is now at a depth of `y - a` yards from the sea level.

Now, the submarine again descends `d` yards from the new position.

So, the new position of the submarine from sea level

`= (y - a) - d` yards`= y - a - d` yards,

which is the required answer to the given problem. Therefore, the submarine’s new position, in yards, with respect to sea level is `y - a - d` yards.

The given problem states that a submarine is hovering at `y` yards below sea level. If it ascends `a` yards and then descends `d` yards, we need to find the submarine’s new position with respect to the sea level. We know that the distance between a submarine and the sea level is measured in yards.

Let's find the answer step by step.

Based on the problem, the submarine was initially at a depth of `y` yards and it ascends to `a` yards.

Therefore, the submarine is now at a depth of `y - a` yards from the sea level.

That means the submarine is currently `y - a` yards deep.

Now, the submarine descends again by `d` yards.

Therefore, the new position of the submarine from sea level `= (y - a) - d` yards`= y - a - d` yards.

This is the required answer to the given problem.

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Answer:

the answer is true.

Explanation:

hope it will help you

If the back of a person's eye is too close to the lens, this person is suffering from b) nearsightedness, also known as myopia.

Nearsightedness is a common refractive error that affects the ability to see distant objects clearly. In this condition, the eyeball is slightly elongated or the cornea is too curved, causing light rays to focus in front of the retina rather than directly on it.

When the back of the eye is too close to the lens, it means that the distance between the lens and the retina is too short. As a result, light entering the eye converges too much before reaching the retina, causing the image formed on the retina to be blurry. Nearsighted individuals typically have clear vision for objects that are up close, but struggle with distant objects.

To correct nearsightedness, concave lenses are used to diverge the incoming light rays before they reach the eye, effectively moving the focal point farther back and allowing the image to focus properly on the retina. These corrective lenses help to compensate for the longer-than-normal eyeball length or excessive corneal curvature, enabling the person to see distant objects more clearly.

In summary, if the back of a person's eye is too close to the lens, they are likely suffering from nearsightedness (myopia). This condition can be corrected with the use of concave lenses to adjust the focal point and improve distance vision.

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Answer:

M = 1.994 × 10^(30) kg

Explanation:

We are given;

Orbital radius; r = 1.5 × 10^(8) km = 1.5 × 10^(11) m

Gravitational constant; G = 6.67 × 10^(-11) N.m²/kg²

If the orbit is circular, the it means the gravitational force is equal to the centripetal force.

Thus; F_g = F_c

GMm/r² = mv²/r

Simplifying gives;

GM/r = v²

M = v²r/G

Now, v is the speed of the earth around the sun and from online sources it has a value of around 29.78 km/s = 29780 m/s

Thus;

M = (29780^(2) × 1.5 × 10^(11))/6.67 × 10^(-11)

M = 1.994 × 10^(30) kg

When birds sit on a single power line, they are not grounded, which means they do not provide a path for current to flow from the high voltage power line through their body to the ground. But if they were to place one foot on each of two lines, they would complete a circuit, and current would flow through their body, and they would receive a terrible shock.

Electricity flows through a circuit when there is a path for current to flow from a power source to the ground. The power lines carry high voltage electricity, which can be dangerous to living organisms, including birds. However, birds sitting on a single power line don't get shocked because they are not providing a path for current to flow from the power line through their body to the ground.The reason birds are not grounded when they sit on a single power line is that they have only one point of contact with the power line.

Therefore, the current cannot flow through their body and reach the ground. In other words, they are not part of the circuit.In conclusion, birds sitting on a single power line do not get shocked because they are not grounded and do not provide a path for current to flow through their body to the ground. However, if they were to place one foot on each of two lines, they would complete a circuit, and current would flow through their body, resulting in a terrible shock.

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