A force of 5.0 N is applied to a 20-kg mass on a horizontal frictionless surface. As the speed of the mass increases at a constant acceleration, the power delivered to it by the force:
a. remains the same.
b. increases.
c. decreases.
d. doubles every 4.0 seconds.
b
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Which of the following are predictions of inflation theories?
A. The cosmic microwave background must be uniform. B. The Universe expanded rapidly over a short period of time. C. The smaller initial size of the Universe allowed thorough mixing. D. All of these choices are correct.
Water in a dish is set on a table in an initially empty closed room and begins to evaporate. The temperature of the water will
A. remain the same. B. begin to decrease. C. begin to increase. D. not be able to be predicted based on the information given.
According to Kepler's third law (p2 = a3), how does a planet's mass affect its orbit around the Sun?
A) More massive planets orbit the Sun at higher average speed. B) A planet's mass has no effect on its orbit around the Sun. C) More massive planets must have more circular orbits. D) A more massive planet must have a larger semimajor axis.
A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it approaches a stationary pedestrian
What frequency does the pedestrian hear? The speed of sound in air is 343 m/s. A) 200 Hz B) 375 Hz C) 400 Hz D) 425 Hz E) 450 Hz