An apparent westward motion of a planet in the sky compared to the background stars (as viewed from Earth) when observed on successive nights is referred to as
a. epicycle.
b. retrograde motion.
c. prograde motion.
d. heliocentric motion.
e. deferent.
b
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Earth's magnetic field is generated by the dynamo effect in the
a. molten metallic core. b. solid central core. c. plastic mantle. d. crust. e. aurora.
A flat piece of iron is tightly tied against top of a wooden block. The iron-wood block floats in a bucket of water. If the iron-wood block flips over so the iron is on the bottom, the water level at the side of the bucket
A) rises. B) falls. C) remains the same.
A ball is thrown vertically upwards at 29.4 m/s. For its complete trip (up and back down to the starting position), its average speed is:
a. 14.7 m/s. c. 4.90 m/s. b. 9.80 m/s. d. not given.
For condensation of a vapor using multiple horizontal cold tubes, suggest an arrangement of the tubes to maximize condensation.
What will be an ideal response?