Which of the following is true?
A. Energy is measured in joules, and power is measured in calories.
B. Power is energy divided by time.
C. Batteries release energy, but TNT releases power.
D. Power signifies a very large value of energy.
E. All of the above.
Answer: B. Power is energy divided by time.
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The high ____________________ of quasars reveals to astronomers that they must be very distant
Fill in the blank(s) with correct word
The most massive and densest planets are the terrestrials
a. True b. False Indicate whether the statement is true or false
Given that Mercury, Mars, and some of the moons of the gas giants are covered with craters, why do we not see lots of impacts happening today?
A. Most of the impacts happen on the far sides of these bodies. B. Gravitational interactions between planets and planetesimals ejected most of the larger debris. C. We would, but the impacts have always happened at a very slow rate and built up over billions of years. D. All the planetesimals have collided with planets already.
If 4.0 J of work are performed in stretching an ideal spring with a spring constant (force constant) of 2500 N/m, by what distance is the spring stretched?
A) 3.2 cm B) 3.2 m C) 0.3 cm D) 5.7 m E) 5.7 cm