Suppose you wanted to show the Sun on the same scale. About how big would it need to be?
A) 3.5 centimeters in diameter (the size of a golf ball)
B) 35 centimeters in diameter (a little bigger than a basketball)
C) 3.5 meters in diameter (about 11-1/2 feet across)
D) 3.5 kilometers in diameter (the size of a small town)
C) 3.5 meters in diameter (about 11-1/2 feet across)
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An object that is 75 cm tall is located 3.8 m in front of a plane mirror. The image formed by the mirror appears to be
A) on the mirror's surface. B) 1.9 m behind the mirror's surface. C) 3.8 m behind the mirror's surface. D) 1.9 m in front of the mirror. E) 3.8 m in front of the mirror.
A scientist intuitively believes that a higher power must be present in the universe. However, she can provide no experimental data to support her belief. This is an example of
A) pseudoscience B) hypothesis-driven science C) nonscience D) discovery science
An avalanche of ice and snow of mass 1 500 kg slides a vertical distance of 190 m down a mountainside. If the temperature of the ice, snow, mountain and surrounding air are all at 0°C, what is the change in entropy of the universe?
a. 2.05E+4 J/K b. 1.02E+4 J/K c. 5.12E+3 J/K d. 3.41E+3 J/K e. 1.04E+3 J/K
The force of gravity is the only one of the four forces felt on very large size scales. Which of the following best explains why the other forces don't play a major role on large scales?
A) The other three forces are all very short in range, and cannot be felt over large distances. B) The strong and weak forces act only on very small scales, and large objects tend to be electrically neutral and therefore don't feel an electromagnetic force. C) Gravity is by far the strongest force, so it simply dominates on large size scales. D) Effects of the strong and weak forces tend to cancel out effects of the electromagnetic force on large scales.