A heat pump has a coefficient of performance of 4 . If the heat pump absorbs 20 cal of heat from the cold outdoors in each cycle, the heat expelled (in cal) to the warm indoors is
a. 34
b. 27
c. 36
d. 40
e. 80
B
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A box weighing 550N slides at constant speed across a flat parking lot, under the influence of a stiff wind. The wind applies a force of 155N parallel to the surface of the parking lot. What is the angle relative to the vertical of the contact force applied by the ground.
a. 
b. 
c. 
d. 
e. 
All stars that become supernovae will leave behind a neutron star
Indicate whether the statement is true or false
A 3.0-kg object moving in the positive x direction has a one-dimensional elastic collision with a 5.0-kg object initially at rest. After the collision the 5.0-kg object has a velocity of 6.0 m/s in the positive x direction. What was the initial speed of the 3.0 kg object?
a. 6.0 m/s b. 7.0 m/s c. 4.5 m/s d. 8.0 m/s e. 5.5 m/s
The normal force is always equal to the force of gravity
Indicate whether the statement is true or false