Both a radio wave and light wave have identical
A) speeds.
B) wavelengths.
C) frequencies.
D) all of the above
E) none of the above
Answer: A
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An object attached to the end of a string swings in a vertical circle (R = 1.2 m), as shown. At an instant when ? = 30°, the speed of the object is 5.1 m/s and the tension in the string has a magnitude of 20 N. What is the mass of the object?
a.
2.0 kg
b.
1.5 kg
c.
1.8 kg
d.
1.2 kg
e.
0.80 kg
A car starts from rest and accelerates at 6.00 m/s2. How far does it travel in 3.00 s?
A) 9.00 m B) 18.0 m C) 27.0 m D) 36.0 m E) 54.0 m
When a photon collides with a free electron at rest and the direction of motion of the photon changes,
a. the magnitude of the momentum of the photon does not change. b. the momentum of the electron does not change. c. the kinetic energy of the electron does not change. d. the total energy of the photon does not change. e. both the magnitude of the momentum and the total energy of the photon decrease.
Which of the following statements about degeneracy pressure is not true?
A) Degeneracy pressure keeps any protostar less than 0.08 solar mass from becoming a true, hydrogen-fusing star. B) Degeneracy pressure can halt gravitational contraction of a star even when no fusion is occurring in the core. C) Degeneracy pressure is a consequence of the laws of quantum mechanics. D) Degeneracy pressure varies with the temperature of the star.