Physics

Work, power & energy Solutions

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R (BradshawRPHY1) / Homework 5, energy 21-22 / View
Jordan d
will compress. After compressing the spring,
the block will slide up the plane to some maxi-
mum height, ha, after which it will again slide
back down.
How much work is done on the block be-
tween its release at height h and its ascent to
its next maximum height?
1. 303.521
2. 429.05
3. 360.44
4. 300
5. 665.742
6. 440.964
7. 396.296
8. 420.37
9. 405
10084.36
Answer in units of N/m.
1. 2u magha
2. None of these
3. Magh-hA) +2j1 magha
4.0
5. More information is needed.
022 (part 2 of 2) 10.0 points
Find the work done in stretching the spring
1. 0.54439
2. 6.73465
3. 3.216
4. 1.51704
5. 5.5161
6. 4.2012
7. 3.996
8. 5.9696
9. 1.2285
6. mag (h - ha)
10. 2.454
020 10.0 points
An elevator of mass m is initially at resto
the first floor of a building. It moves upward,
and passes the second and third floors with
a constant velocity, and finally stops at the
fourth floor. The distance between adjacent
floors is h.
What is the net work done on the elevator
during the entire trip, from the first floor to
the fourth floor?
wer in unsur J.
1. W = -3 mgh
2. W=3mgh
3. W=0
023 10.0 por
A cheerleader its his 41.3 kg partner steht
up off the ground a distance of 0.285 m befo
releasing her. Assume the partner's velocity
is zero at the beginning and the end of the lift.
The acceleration of gravity is 9.8 m/s.
If he does this 15 times, how much work has
he done?
1. 16134.7
2. 3003.03
3. 1657.98
4. 4360.38
5. 6223.77
7624.8
7. 9514.35
8. 1730.26
10218.8
7837.24
wer in units of J.
4. W = -4mgh
5.
Wmeh
6. None of these.
021 (part 1 of 2) 10.0 points
The force required to stretch a Hooke's law
spring varies from O N to 68.1 N as we stretch
the spring by moving one end 16.2 cm from
(part 1 of 3) 10.0 points