A bumper car is moving at constant velocity when another bumper car starts to push on it with a constant force at an angle of 60 degrees with respect to the first car's initial velocity. The second bumper car continues pushing in exactly that direction for some time. What is most likely to happen is that
a. the first car will stop moving.
b. the first car will move in the direction of the force. c. the first car's velocity will increase in magnitude but not change direction.
d. the first car's velocity will gradually change direction more and more toward that of the force while increasing in magnitude. e. the first car's velocity will gradually change direction more and more toward that of the force while decreasing in magnitude.
D
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In star clusters, the ____ stars are giant stars fusing helium in their cores and then in their shells
a. turnoff point b. main sequence c. turnon point d. hydrogen flash e. horizontal branch
An ambulance is generating a siren sound at a frequency of 2,400 Hz. The velocity of sound is 345.0 m/s. If the observer is traveling at a velocity of 24.00 m/s toward the stationary ambulance, then what is the frequency of the siren perceived by the observer?
A. 2,657 Hz B. 2,567 Hz C. 2,532 Hz D. 2,500 Hz E. 2,479 Hz
If an object's mass decreases while a constant force acts on it, the acceleration
A) decreases. B) remains the same. C) increases. D) will be zero.
In the unified model of active galactic nuclei, the broad line region in an active galactic nucleus is
a. composed of clouds of gas and stars moving at very high orbital velocities near a supermassive black hole. b. composed of a supermassive black hole surrounded by empty space. c. responsible for producing the bright continuous radiation from within the event horizon. d. responsible for the narrow absorption lines seen in Type 2 Seyfert galaxies. e. located far from the core beyond the disk of stars of the galaxy.