A ball rolls horizontally off the edge of a cliff at 4.00 m/s. If the ball lands a distance of 30.0 m from the base of the vertical cliff, what is the height of the cliff?
A)
276 m
B)
138 m
C)
9.20 m
D)
552 m
E)
92.0 m
A
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a. True b. False Indicate whether the statement is true or false
In the late 1990's, it was announced that the expansion of the Universe is accelerating. What does this imply from the perspective of the big bang?
a. A force exists that we knew nothing about that causes the acceleration. b. The Universe must be closed. c. The Universe is finite. d. The amount of dark matter must be greatly less than the amount of normal matter. e. The Universe must be infinitely old.
The force due to gravity between two objects can be described using the equation Fg = G M1 M2 / d2. According to this equation, if the distance between two objects increases, what happens to the gravitational force between them?
A) The force increases. B) The force decreases. C) The force drops instantly to zero. D) The gravitational force is not affected by distance.
What is the specific 3-step energy generating process in the Sun called?
A. the proton-proton chain B. radiative transfer C. hydrostatic equilibrium D. thermography