Which of the following is a conservative force? (All refer to a car on a slope.)
a. The force you exert on the car pushing it uphill.
b. The force exerted by rain drops falling on the car.
c. The frictional force of the road on the car.
d. The gravitational force acting on the car.
e. The force you exert on the car (pushing it uphill) after it starts to slide downhill.
d
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Thermodynamic Processes: When a gas expands adiabatically,
A. the internal (thermal) energy of the gas decreases. B. the internal (thermal) energy of the gas increases. C. it does no work. D. work is done on the gas. E. the temperature of the gas remains constant.
A boat hits a sandbar and slides some distance before coming to rest. Which of the arrows shown below best represents the direction of the boat’s acceleration as it is sliding? (Hint: Draw a motion diagram.)
A. A
B. B
C. C
D. D
E. E
F. F
T. Zero
An object is thrown downward with an initial (t = 0) speed of 10 m/s from a height of 60 m above the ground. At the same instant (t = 0), a second object is propelled vertically upward from ground level with a speed of 40 m/s. At what height above the ground will the two objects pass each other?
a. 53 m b. 41 m c. 57 m d. 46 m e. 37 m
Elastic Collisions: A block of mass m = 3.6 kg, moving on a frictionless surface with a speed vi = 9.3 m/s, makes a sudden perfectly elastic collision with a stationary block of mass M, as shown in the figure. Just after the collision, the 3.6-kg block recoils with a speed of vf = 2.7 m/s. What is the speed V of the other block?
A. 6.6 m/s B. 8.0 m/s C. 9.3 m/s D. 10.7 m/s E. 12.0 m/s