King Kong falls from the top of the Empire State Building, through the air (air friction is present), to the ground below
How does his kinetic energy (K) just before striking the ground compare to his potential energy (U) at the top of the building? A) K is equal to U.
B) K is less than U.
C) K is greater than U.
D) It is impossible to tell.
B
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Which of these is an electronic instrument that can plot voltage as it varies with time?
A. An electroscope B. An oscilloscope C. An ammeter D. A galvanometer
Which star is the closest if all have the same apparent brightness?
A. a temperature 6000 K main sequence star B. a red giant C. a temperature 10000 K main sequence star D. a main sequence star with a luminosity 100 times that of the Sun E. white dwarf
If Newton's law of universal gravitation turned out to be Gm1m2/r rather than Gm1m2/r2, tides on Earth
A. would not happen because the force of gravity from the Moon would be too strong. B. would still occur because each side of the Earth would feel a different gravitational force from the Moon. C. would not occur because gravity would then be a repulsive force. D. would not occur because the Sun would cancel out the Moon's gravity.
Which of the following statements expresses what we mean by a scientific theory?
A) a simple model that explains a wide variety of phenomena and that has survived repeated tests B) an explanation for a physical phenomenon, an explanation that hasn't been tested yet C) an educated guess