During the time that a planet is in its period of apparent retrograde motion, ________
A) the planet is getting closer to the Sun in its orbit
B) the planet appears to rise in the west and set in the east, rather than the usual rising in the east and setting in the west
C) over many days or weeks, the planet moves westward relative to the stars, rather than the usual eastward relative to the stars
D) the planet moves backwards (clockwise as viewed from above Earth's north pole) in its orbit of the Sun
C
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Mass on a Spring: A 0.16-kg block on a horizontal frictionless surface is attached to an ideal spring whose force constant (spring constant) is 360 N/m. The block is pulled from its equilibrium position at x = 0.000 m to a position x = +0.080 m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. When the position is x = -0.037 m, what is the acceleration of the block?
A. 83 m/s2 B. 43 m/s2 C. 64 m/s2 D. 270 m/s2 E. 370 m/s2
Electrons are used to produce X-rays by allowing a beam of electrons to strike a heavy metal surface. When the intensity of the electron beam is increased, this results in:
A. X-rays being produced having longer wavelength B. X-rays being produced having higher energy C. More X-rays produced per unit time D. Faster X-rays being produced
Why do Uranus and Neptune appear blue?
A) Oceans that are visible through their atmospheres are blue. B) The nitrogen gas in their atmospheres absorbs red light. C) The methane gas in their atmospheres absorbs red light. D) Small dust grains preferentially scatter blue light.
At about what frequency is Earth struck by a meteorite large enough (about 10 km in diameter) to cause mass extinctions?
A) about every 1 million years B) about every 10 million years C) about every 100 million years D) This has yet to occur on Earth.