A 5.00-kg box slides 3.00 m across the floor before coming to rest. What is the coefficient of kinetic friction between the floor and the box if the box had an initial speed of 3.00 m/s?
A) 1.50
B) 0.587
C) 0.153
D) 0.306
E) 0.200
C
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If the red shifts of quasars arise from the expansion of the universe yet they have brighter magnitudes than galaxies with the same red shifts, the quasar must be
a. very small. b. within the Local Group. c. a single star with an extremely large mass. d. be moving toward Earth with a large radial velocity. e. emit a very large amount of energy per second.
A totally eclipsed Moon glows coppery red because
a. the Moon's surface is made of iron ore which is red in color. b. red light is cooler than blue light. c. during a lunar eclipse the Sun is cooler than normal and its light is more red. d. only red light is able to pass completely through Earth's atmosphere and reach the Moon. e. the Moon appears red during a total solar eclipse, not a total lunar eclipse.
A quasar is a strong X-ray pulsar that emits radiation at set time intervals.
Answer the following statement true (T) or false (F)
A nucleus undergoes radioactive decay, emitting a gamma ray. Which of the following statements is true?
A. A nuclear proton changes into an electron-positron pair. B. Both daughter and parent nuclei have the same atomic number. C. The daughter nucleus is more massive than the parent. D. The daughter nucleus has more neutrons than the parent.