A block is launched up an incline plane. After going up the plane, it slides back down to its starting position. The coefficient of friction between the block and the plane is 0.3 . The time for the trip up the plane:
a. is the same as the time for the trip down.
b. is more than the time for the trip down.
c. is less than the time for the trip down.
d. cannot be found without knowing the angle of inclination.
c
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____ about 130 km above Earth's surface near the polar regions when energy in the solar wind guided by Earth's magnetic field excites gases in the upper atmosphere
a. Coronas occur b. Flares occur c. Auroras occur d. Coronal holes occur e. Nuclear fission occurs
If the distance between us and a star is doubled, with everything else remaining the same, the luminosity
A) is decreased by a factor of four, and the apparent brightness is decreased by a factor of four. B) is decreased by a factor of two, and the apparent brightness is decreased by a factor of two. C) remains the same, but the apparent brightness is decreased by a factor of two. D) remains the same, but the apparent brightness is decreased by a factor of four. E) is decreased by a factor of four, but the apparent brightness remains the same.
What is the sum of 1.53 + 2.786 + 3.3?
A) 8 B) 7.6 C) 7.62 D) 7.616 E) 7.6160
Which of the following lists the planets of our solar system in the correct order from closest to farthest from the Sun?
A) Earth, Mars, Mercury, Venus, Jupiter, Saturn, Uranus, Neptune B) Mercury, Earth, Venus, Mars, Jupiter, Saturn, Neptune, Uranus C) Mercury, Venus, Mars, Earth, Saturn, Jupiter, Neptune, Uranus D) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune