To the outer edge of the Galaxy, the rotation curve finds objects moving ________ than Kepler's Laws would lead us to expect
Fill in the blank(s) with correct word
faster
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Kim is in a spaceship moving past you at half the speed of light. Which of the following correctly describes how you will perceive each other's time?
A) You will say that Kim's time is running slow, and she will say that your time is running slow. B) You will say that Kim's time is running slow, and she will say that your time is running fast. C) You will say that Kim's time is running fast, and she will say that your time is running slow. D) You will both agree that time runs at the same rate for both of you.
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.
The mass of a proton is 1.6726 × 10-27 kg and the mass of a neutron is 1.6606 × 10-27 kg. A proton captures a neutron forming a deuterium nucleus. One would expect the mass of this nucleus to be
A) equal to (1.6726 + 1.6606 ) × 10-27 kg. B) less than (1.6726 + 1.6606 ) × 10-27 kg. C) greater than (1.6726 + 1.6606 ) × 10-27 kg.
Find the frequency of X-rays of wavelength 1 Å = 10-10 m
a. 3 × 10^18 Hz b. 3 × 10^10 MHz c. 6 × 10^9 Hz d. 3 × 10^8 Hz e. 3 × 10^20 Hz