A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600 N, what is the fundamental frequency?
a. 316 Hz
b. 632 Hz
c. 158 Hz
d. 215 Hz
e. 79 Hz
C
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The ground-state energy of an electron in a hydrogen atom is ?13.6 eV. This means that the binding energy of that electron is
A. ?13.6 eV. B. +13.6 eV. C. Some other value (specify).
Which statement could be considered a scientific theory?
a. Beauty pageant contestants are becoming increasingly more beautiful. b. Chemistry and physics are more exact sciences than biology. c. Change occurs in the inherited traits of a population over generations. d. The growth of a plant is faster in a growth chamber than in a greenhouse. e. Leaves bend toward the light because they know light is needed to grow.
Between A and D?
A. 0 s B. 2 s C. 3 s D. 4 s E. 5 s F. Other (specify)
Suppose you kick a soccer ball straight up to a height of 10 meters. Which of the following is true about the gravitational potential energy of the ball during its flight?
A) The ball's gravitational potential energy is greatest at the instant when the ball is at its highest point. B) The ball's gravitational potential energy is greatest at the instant it returns to hit the ground. C) The ball's gravitational potential energy is always the same. D) The ball's gravitational potential energy is greatest at the instant the ball leaves your foot.