Question

Assuming the height of your working desk is h=1.0m above the floor, the mass of ypur book is 100 times of your pen. assume there is no air friction in the room. What is the ration Ubook/Upen of their Potential energies with respect to the ground? if both the bok and the pen drop from rest from your table to the floor, what will be the ratio Vbook/Vpen of their speeds right before they hit the ground?

Answer #1

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

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.

Q1.Energy is defined as
the ability to do work.
the conservation of displacement.
the distance traveled divided by time.
the time rate of doing work.
Q2.While rearranging a dorm room, a student does 300 J
of work in moving a desk 2.0 m. What was the magnitude of the
applied horizontal force?
150 N
600 N
0 N
2940 N
Q3.Power
is force divided by time.
is work divided by time.
is work times time.
has the same units as...

Show all your steps and draw diagrams where necessary. Add
explanatory notes where necessary. 1. A 20-kg child swings back and
forth on a swing such that her height h in m from the ground as a
function of x is described by: h(x) = 0.5 + 0.45x2 for -1.2 m x
1.2 m (a) What is the position of the child when x = 0? (b) Show
graphically how the potential and kinetic energies of the child...

8 through 10 done please!!
3.13.6
Question 110 pts
A 319 kg motorcycle is parked in a parking garage. If the car has
35,494 J of potential energy, how many meters above ground is the
car? Report your answer to 1 decimal place. Please do not include
units or the answer will be marked incorrect.
Flag this Question
Question 210 pts
A box sitting on the top of a hill has 252 J of potential energy.
If the hill is...

just do questions 5 through 10
3.13.6
Question 110 pts
A 319 kg motorcycle is parked in a parking garage. If the car has
35,494 J of potential energy, how many meters above ground is the
car? Report your answer to 1 decimal place. Please do not include
units or the answer will be marked incorrect.
Flag this Question
Question 210 pts
A box sitting on the top of a hill has 252 J of potential energy.
If the hill...

answer all questions
3.13.6
Question 110 pts
A 319 kg motorcycle is parked in a parking garage. If the car has
35,494 J of potential energy, how many meters above ground is the
car? Report your answer to 1 decimal place. Please do not include
units or the answer will be marked incorrect.
Flag this Question
Question 210 pts
A box sitting on the top of a hill has 252 J of potential energy.
If the hill is 279 meters...

ch 6
1:
It is generally a good idea to gain an understanding of the
"size" of units. Consider the objects and calculate the kinetic
energy of each one.
A ladybug weighing 37.3 mg
flies by your head at 3.83 km/h
.
×10
J
A 7.15 kg
bowling ball slides (not rolls) down an alley at 17.5 km/h
.
J
A car weighing 1260 kg
moves at a speed of 49.5 km/h.
5:
The graph shows the ?-directed force
??...

do all five questions
Question 1
20 pts
Ignoring the effects of air resistance, if a ball falls freely
toward the ground, its total mechanical energy
Group of answer choices
increases
remains the same
not enough information
decreases
Flag this Question
Question 2
20 pts
A child jumps off a wall from an initial height of 16.4 m and lands
on a trampoline. Before the child springs back up into the air the
trampoline compresses 1.8 meters. The spring constant...

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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