Question

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.

Answer #1

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 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.

An Amazon package of mass ? = 163 kg is released from rest at
point A and slides on the frictionless track shown. Point A is ?? =
7.90 ? above the ground. Point B is ?? = 2.50 ? above the ground.
Ignore air resistance.
a) Determine the potential energy of the Amazon package at Point
A relative to the ground.
b) Determine the speed of the Amazon package at Point B.
c) The Amazon package hits the ground...

An object of mass 5 kg is released from rest 24525 m above the
ground and allowed to fall under the influence of gravity. Assume
the gravitational force is constant, with g=9.8 m/sec2 , and the
force due to air resistance is proportional to the velocity of the
object with proportionality constant k= 1 kg/sec. Approximate when
(in seconds) the object will strike the ground.

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

An object of mass 120 kg is released from rest 480000 m above
the ground and allowed to fall under the influence of gravity.
Assume the gravitational force is constant, with g=9.8
m/sec2 , and the force due to air resistance is
proportional to the velocity of the object with proportionality
constant k= 3 kg/sec. Approximate the speed (in m/sec) of the
object when it strikes the ground.

A 1-kg ball is released from a height of 6 m, and a 2-kg ball is
released from a height of 3 m. Air resistance is negligible as they
fall. Which of the following statements about these balls are
correct? (There could be more than one correct choice.)
Both balls will reach the ground with the same speed.
As they reach the ground, the 1-kg ball will have more kinetic
energy than the 2-kg ball because it was dropped from...

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...

A
ball of mass 2.25 kg is released from rest at height 5.29 m above
the floor. It falls, hits the ground, and rebounds to height 3.19 m
above the floor. Assume none of the losses are due to air friction.
Find the impulse, in N-s, exerted by the floor on the ball. The
sign of your answer will give the direction of the impulse.

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...

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