The speed of a boat is often given in knots. If a speed of 5 knots were expressed in the SI system of units, the units would be:
a. m
c. m/s
b. s
d. kg/s
C
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The largest diameter telescopes are used to observe
A) radio waves. B) infrared light. C) visible light. D) ultraviolet light. E) x-rays.
This figure shows an all-sky map of the cosmic microwave background recorded by the Planck mission. What do the dark and bright variations represent?
A) regions of the sky with very slightly different density at the time the radiation was emitted B) regions of the sky with different proportions of hydrogen and helium at the time the radiation was emitted C) the present distribution of galaxies in the universe D) regions of the sky with different amounts of dark energy
A diver in midair is pulled toward the pool below by the force of gravity from Earth. Earth experiences an upward force from the diver that ________.
A. is greater than the force on the diver by Earth B. is less than the force on the diver by Earth C. is equal to the force on the diver by Earth D. There is no upward force by the diver on Earth. E. There is insufficient information to determine the gravitational pull on Earth by the diver.
The potential energy of a pendulum is least
a. when its potential energy is greatest. b. at the top of its swing. c. at the bottom of its swing. d. when its total energy is greatest.