When an object is released from rest and falls in the absence of friction, which of the following is true concerning its motion?
A) Its velocity is constant.
B) Both its acceleration and its velocity are constant.
C) Neither its acceleration nor its velocity is constant.
D) Its acceleration is constant.
D
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A person drops a brick from the top of a building. The height of the building is 400 m and the mass of the brick is 2.00 kg. What will be the speed of the brick right before it touches the ground? Use g = 10.0 m/s2
A) 10.0 m/s B) 13.2 m/s C) 89.4 m/s D) 59.4 m/s E) 63.2 m/s
What physical property of a star does the spectral type measure?
A) density B) luminosity C) temperature D) mass E) composition
The tides on Earth are an example of
A) Newton's first law of motion. B) Newton's second law of motion. C) Newton's third law of motion. D) the universal law of gravitation. E) none of the above
Force F required to hold the 75-lb weight in equilibrium is:
(A) 37.50 lb
(B) 18.75 lb
(C) 56.25 lb
(D) 25.0 lb
