When is the average velocity of an object equal to the instantaneous velocity?
A) only when the velocity is increasing at a constant rate
B) only when the velocity is decreasing at a constant rate
C) when the velocity is constant
D) always
E) never
C
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What is the primary way in which we determine the mass distribution of a spiral galaxy?
A) We count the number of stars we can see at different distances from the galaxy's center. B) We calculate its mass-to-light ratio. C) We apply Newton's version of Kepler's third law to the orbits of globular clusters in the galaxy's halo. D) We construct its rotation curve by measuring Doppler shifts from gas clouds at different distances from the galaxy's center.
A tetherball is attached to a pole with a 2.0-m rope. It is circling at 0.20 rev/s. As the rope wraps around the pole, it shortens. How long is the rope when the ball is moving at 6.0 m/s?
a. 1.8 m c. 1.2 m b. 0.83 m d. 1.0 m
The function of an enzyme is to ____
a. carry coded information to the rest of the cell b. regulate chemical reactions within a cell c. provide the basic building blocks of a cell d. carry the genetic information of a cell e. provide the structure and function of a cell
A negatively charged rod is brought close to an uncharged electroscope. While the rod is close one's finger touches the far side of the metal ball on the electroscope. After the charged rod has been removed the finger is removed. The electroscope is
A. positively charged. B. uncharged. C. negatively charged.