51. The slope of the distance-time graph represents:
a) acceleration
b) change in acceleration
c) speed
d) distance
52. The area under a speed-time graph represents:
a) acceleration
b) Δa
c) distance
d) velocity
53. You drop a rock from a bridge to the river below. When the rock has fallen 4m, you drop a second rock. As the rocks continue their free fall, their separation:
a) increase
b) decrease
c) stay the same
d) None
54. A 30 kg object is supported by a rope, such that tension in the rope is equal to its weight. The weight of the object is:
a) 30kg
b) 30N
c) 294N
d) 9.8N
55. The force needed to produce an acceleration of 10ms⁻² in a ball mass of 0.5kg is:
a) 20 N
b) 10.5 N
c) 9.5 N
d) 5 N
56. What is the mass of a car that is travelling with a velocity of 20m/s[W] and moment of 22000 kg m/s[W]?
a) 440000 kg
b) 21980 kg
c) 22020 kg
d) 1100 kg
57. An object on earth and taken to the moon should have:
a) Less mass / less weight
b) same mass/more weight
c) same mass/less weight
d) less mass/ same weight
58. The heat death of the universe will occur when the temperature:
A. Difference is zero
B. Is maximum
C. Is minimum
D. None of the above
59. By increasing the temperature of the source, the efficiency of the Carnot engine is:
A. Increased
B. Decreased
C. Unchanged
D. None of the above
60. Under Isothermal conditions, the internal energy of the gas is:
A. Unchanged
B. Decreases
C. Increases
D. None of the above
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