A 1200 kg car is traveling at 4.00 m/s and strikes a wall. The 1200 kg car bounces off the wall with a velocity of 4.00 m/s. If the contact with the wall by the car lasts for 0.100 seconds, then the impulse on the car is
A. 12,400 kg m/s.
B. 10,200 kg m/s.
C. 9,600 kg m/s.
D. 8,400 kg m/s.
E. 2,900 kg m/s.
C. 9,600 kg m/s.
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A neutron star is
A) the remains of a star that died in a massive star supernova (if no black hole was created). B) the remains of a star that died by expelling its outer layers in a planetary nebula. C) a star made mostly of elements with high atomic mass numbers, so that they have lots of neutrons. D) an object that will ultimately become a black hole.
Of the following photons, which has the lowest energy?
a. visible b. ultraviolet c. infrared d. microwave
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What behavior of muons moving through Earth's atmosphere was different compared to muons at rest in a way that helped confirm time dilation?
a. They moved a shorter distance in Earth's reference system than in their own. b. Their size was smaller as seen from Earth's reference system. c. Their arrival in Earth's atmosphere and their detection on the ground were no longer synchronized. d. Their speed was different as seen in Earth's reference system and in the reference system in which they were at rest. e. They lived longer as shown by traveling farther before decay in Earth's reference system.