The Moon always keeps the same side facing Earth
a. True
b. False
Indicate whether the statement is true or false
True
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Why does something weigh less on the Moon than on Earth?
A. The Moon has no atmosphere to apply a downward force on surface objects. B. Earth's gravity pulls in the opposite direction as the Moon's, so the net force is reduced. C. The farther something is from Earth, the lower its weight. D. The Moon's lower mass creates a lower force of gravity at its surface. E. The object's weight is the same on the Moon as it is on Earth.
The planet Neptune was discovered by perturbations of
A) Uranus. B) its moons. C) Pluto. D) none of the above
The pupil of a cat's eye narrows to a slit width of 0.5 mm in daylight. What is the angular resolution of the cat's eye in daylight (? = 500 nm)?
A. 0.01 rads B. 10?5 rads C. 10?3 rads D. 10?4 rads E. 0.1 rads
A 15-kg mass, attached to a massless spring whose force constant is 2500 N/m, has an amplitude of 4 cm. Assuming the energy is quantized, find the quantum number of the system, n, if En = nhf
a. 1.5 × 10^33 b. 3.0 × 10^33 c. 4.5 × 10^33 d. 5.4 × 10^33 e. 1.0 × 10^33