True or False: If a force of 6 lbs is required to hold a spring stretched 5 inches beyond its natural length, then 60 lb-in. of work is done in stretching it from its natural length to 10 in. beyond its natural length.

1
True or False If a force of 6 lbs is required to
hold a spring stretched 5 inches beyond its
natural length, then 60 lb-in. of work is done in
stretching it from its natural length to 10 in.
beyond its natural length.

1. True
2. False

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2
A heavy rope, 80 ft long, weighs 0.6 lb/ft and
hangs over the edge of a building 140 ft high.
How much work is done in pulling the rope to the
top of the building?

1. 1,920 ft-lb
2. 1,921 ft-lb
3. 2,020 ft-lb
4. 1,870 ft-lb
5. 1,769 ft-lb

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3
An aquarium 3 m long, 8 m wide, and 1 m deep is
full of water. Find the work needed to pump half
of the water out of the aquarium. (Use the facts
that the density of water is image and image
.)

1. 29,250 J
2. 29,411 J
3. 29,400 J
4. 28,400 J
5. 29,410 J

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4
When gas expands in a cylinder with radius
image , the pressure at any given time is a
function of the volume image . The force
exerted by the gas on the piston ( see the figure
) is the product of the pressure and the area
image Find the work done by the gas when the
volume expands from volume image to volume
image image

1. image
2. image
3. image
4. image
5. image

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5
Use Newton's Law of Gravitation to compute the
work required to launch a 1,600 - kg satellite
vertically to an orbit 1,100 km high. You may
assume that Earth's mass is 5.98 image 10 24 kg
and is concentrated at its center. Take the
radius of Earth to be 6.37 image 10 6 m and G
6.67 image 10 - 11 N image m 2 / kg 2. Round
the answer to the nearest million.

1. image
2. image
3. image
4. image

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