Question

A 4.0 kg mass starting at rest is dropped from a height of 120 m above the surface of the Earth. As it falls it experiences an air resistance of 13 N. Just before it strikes the ground, determine the change in potential energy ΔU, the work done by the air W, the final kinetic energy Kf, and its final speed vf

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A 4.0 kg mass starting at rest is dropped from a height of 120 m
above the surface of the Earth. As it falls it
experiences an air resistance of 13 N. Just before it
strikes the ground, determine the change in potential energy ΔU,
the work done by the air W, the final kinetic energy Kf,
and its final speed vf.

A stone 0.44 kg mass is released from rest from a height of 29.4
m above the ground. Ignoring air resistance and letting the ground
be the zero potential energy level,
Determine the final kinetic energy of the stone using energy
conservation principle only, not as a free fall.
Determine the work done on the stone by gravity.

A hot air balloon drops a 20 kg package from rest at a height of
120 m from the ground. Assume we can ignore friction losses, as the
package falls through the air.
a) How much initial potential energy is stored by the
package?
b) What is the kinetic energy of the package just before it hits
the ground?
c) What is the speed of the energy before it hits the
ground?

1 a) Starting from rest, a 50 Kg person dives
into water from a height of 80 m above the water
surface. Air resistance is negligible. (Use g= 10 m/s2)
Calculate (A) the diver’s KE just before striking the water surface
(B) the velocity of the diver just before striking the water (C)
the work done by gravitational force on the diver (D) the power
delivered by gravitational force on the diver
b) A ball of mass m=0.2 Kg
sitting...

An object of mass 120 kg is released from rest 480000 m above
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Assume the gravitational force is constant, with g=9.8
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constant k= 3 kg/sec. Approximate the speed (in m/sec) of the
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A ball of mass 0.4 kg is lifted up to a height of 10 m. what is
the ball's potential energy at this point? if the ball is dropped
from the rest at this height, what is the ball's speed just before
it hits the ground. if the force of air resistance is 0.1 N, what
is the ball's speed just before it hits the ground?

a
mass if 48.0 kg is dropped from a height of 29.0 m. what is the
kinetic and potential energy when it is
a) dropped
b) half way to the ground
c) about to strike the ground

A rock is dropped, from rest, from a height of 8.9 m above the
ground at t = 0 s. At the same time that the rock is
dropped a stone is thrown upward from a height of 1.1 m above the
ground at a speed of 7.1 m/s. The stone travels straight upward
toward the rock. There is no air resistance.
a. Determine the height above the ground where the rock hits
with the stone. Blank 1. Calculate the...

An 80 kg object is dropped from rest from a height of
25 meters above the ground. Use the concept of energy conservation
to find its speed when it is 10 meters above the ground. (Please
explain, very confuse)

A
ball of mass 5.93 kg is released from rest at height 7.62 m above
the floor. It falls, hits the ground, and rebounds to height 3.2 m
above the floor. Assume none of the losses are due to air friction.
Find the work done against friction, in J, on the ball during the
contact with the ground

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