Question

A 1,710 kg pile driver is used to drive a steel beam into the ground. The pile driver falls 9 m before contacting the beam, and it drives the beam 13 cm into the ground before coming to rest. Using energy considerations, calculate the amplitude of the average force (in N) the beam exerts on the pile driver while the pile driver is brought to rest.

Answer #1

A 2,200-kg pile driver is used to drive a steel I-beam into the
ground. The pile driver falls 4.60 m before coming into contact
with the top of the beam, and it drives the beam 15.8 cm farther
into the ground as it comes to rest. Using energy considerations,
calculate the average force the beam exerts on the pile driver
while the pile driver is brought to rest.

Use a mass of 10,000 kg of steel in pile driving. To
make the pile into the ground 20 cm. If the force used to impact
the pile to the ground 1 cm is 125 kN. Find the fast velocity when
the steel hits the pile.

A dart gun has a spring with a constant of 875 N/m. The spring
is initially compressed 5.5 cm. You fire a 0.075-kg dart from a
height of 0 m. The dart hits a wall at a height of 1.5 m. Ignore
air resistance.
What is the initial potential energy of the
spring?
What is the speed of the dart just before it hits the
wall?
The dart then penetrates 0.5 cm into the wall before coming to
rest.
How...

A car of mass 772 kg is traveling 26.4 m/s when the driver
applies the brakes, which lock the wheels. The car skids for 4.47 s
in the positive x-direction before coming to rest.
HINT
(a)
What is the car's acceleration (in m/s2)? (Indicate
the direction with the sign of your answer.)
m/s2
(b)
What magnitude force (in N) acted on the car during this
time?
N
(c)
How far (in m) did the car travel?
m

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.

A 4 kg block is sliding at an initial speed of 10 m/s across a
surface, encountering a constant friction force of 9 N. How much
work is done on the block after it slides 20 cm?
How fast is the block moving after sliding 20 cm?
What's the total distance the block travels before coming to
rest?
What is the average power of friction on the block over the time
it takes the block to come to rest?
What...

A drill is used to spin a wheel that begins from rest for two
seconds. Then while the wheel is still spinning, it is placed on
the ground at the bottom of a hill. The idea is to find out how far
up the hill the wheel will go. The drill exerts a force of 15-Nm,
we'll assume that there is NO energy lost due to friction or air
resistance. The wheel in question will be treated as a solid...

3) A 3 kg block is sliding at an initial speed of 9 m/s across a
surface, encountering a constant friction force of 10 N. How much
work is done on the block after it slides 25 cm? Correct, computer
gets: -2.50 J Hint: Does the block gain or lose energy during this
process? What sign does this imply for the work done on it? 4) How
fast is the block moving after sliding 25 cm? Correct, computer
gets: 8.91...

21) A person carries a 25.0-N rock through the path shown in the
figure, starting at point A and ending at point B. The total time
from A to B is 1.50 min. How much work did gravity do on the rock
between A and B?
A) 625 J
B) 20.0 J
C) 275 J
D) 75 J
E) 0 J
22) A person carries a 2.00-N pebble through the path shown in
the figure, starting at point A and...

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