If the displacement of an object, x, is related to velocity, v, according to the relation x = Av, the constant, A, has the dimension of which of the following?
a. volume
c. time
b. length
d. area
C
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How do astronomers estimate the approximate age of the Universe?
A. The age of the Universe is equal to 1/H. B. The age of the Universe is approximately the age of our Sun. C. The age of the Universe is equal to the Hubble constant (H). D. They measure the distance to the cosmic horizon and divide by the speed of light.
An object moving at a constant speed requires 6.0 s to go once around a circle with a diameter of 4.0 m. What is the magnitude of the instantaneous acceleration of the particle during this time?
A. 2.2 m/s2 B. 2.7 m/s2 C. 3.3 m/s2 D. 3.8 m/s2 E. 4.4 m/s2
If L represents angular momentum, I represents rotational inertia, p represents linear momentum, m represents mass, and r represents a distance, which of the following can represent kinetic energy?
A. p2/2m B. L2/2I C. rpI D. all of the above E. both (a) and (b)
The equators of all four jovian planets rotate more rapidly than the polar regions
Indicate whether the statement is true or false