Let's say that during a thunderstorm you measure the time lag between the flash and the thunderclap to be 3 seconds. If the speed of sound is about 340 m/s, which of the following is the best estimate of your distance to the lightening bolt?
1.about 3 km
2.about 0.3 km
3.about 1 km
4.about 10 km
3
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A bullet is fired through a board, 14.0 cm thick, with its line of motion perpendicular to the face of the board. If it enters with a speed of 450 m/s and emerges with a speed of 220 m/s, what is the bullet's acceleration as it passes through the board?
a. ?500 km/s2 b. ?550 km/s2 c. ?360 km/s2 d. ?520 km/s2 e. ?275 km/s2
According to current science, why didn't oxygen begin to accumulate in the atmosphere for more than a billion years after life appeared on Earth?
A) Early forms of animal life consumed the oxygen released by plants during the first billion years of life on Earth. B) Early life did not release oxygen, and oxygen releasing organisms didn't evolve for a billion years after the earliest life. C) Oxygen was removed from the atmosphere by dissolving in the ocean as quickly as it was released by life. D) Oxygen was removed from the atmosphere by chemical reactions with surface rocks as quickly as it was released by life.
The circular velocity of a satellite orbiting Earth is given by . In this equation, M represents the ____
a. mass of the satellite, and r its radius b. mass of the satellite, and r the distance from Earth to the satellite c. mass of the satellite, and r the distance from Earth's surface to the satellite d. mass of Earth, and r the radius of Earth e. mass of Earth, and r is the distance from Earth to the satellite
The energy released per reaction is smaller for fusion reactions than for the typical fission reactions. Yet fusion produces more energy per pound of fuel than fission of elements because
A. the daughter nuclei produced by fission each have excess kinetic energy. B. the fusion fuel consists of very light elements. C. fusion occurs in the sun.