A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going downwards, the velocity points __________ and the acceleration points __________
Fill in the blank(s) with correct word
down, down
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Which part of the electromagnetic spectrum generally gives us our best views of stars forming in dusty clouds?
A) infrared B) ultraviolet C) visible light D) blue light
A neutral atom loses one of its electrons. It is then
A) a negative ion. B) either a negative or positive ion, depending on which electron was lost. C) a positive ion. D) ashamed of itself. E) a neutral ion.
Where does nuclear fusion occur in the Sun?
A) on the surface B) in a layer just below the surface C) deep in its core D) in a layer just above the visible surface E) all of the above
A 1959 penny has a diameter of 19.55 mm, a thickness of 1.55 mm, and a mass of 2.500 g. What is its density?
A) 5.37 × 103 kg/m3 B) 21.5 × 103 kg/m3 C) 1.34 × 103 kg/m3 D) 2.68 × 103 kg/m3 E) 1.86 × 10-4 kg/m3