You have 10 tungsten bulbs, and each uses 100 watts. You leave them all on for an hour. The energy used is
A. 10 kilowatt-hours
B. 1 kilowatt-hour
C. 10 kilowatts
D. 1000 watts
Answer: B. 1 kilowatt-hour
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The ____________________ of a radioactive substance is the amount of time for the substance to be reduced by half
Fill in the blank(s) with correct word
Uranus completes an orbit around the Sun every 84 years and spins once every 17 hours, approximately. Which of the following could be observed from the planet Uranus?
A. one sunrise every 17 hours on the equator B. nights lasting several years near the pole tipped away from the Sun C. days lasting several years near the pole tipped toward the Sun D. season cycle of 84 years near the poles E. All of these choices are correct.
An astronaut is standing on the surface of a planetary satellite that has a radius of 1.74 × 106 m and a mass of 7.35 × 1022 kg
An experiment is planned where a projectile needs to be launched straight up from the surface. What must be the minimum initial speed of the projectile so it will reach a height of 2.55 × 106 m above this satellite's surface? (G = 6.67 × 10-11 N ? m2/kg2)
In the middle of the Crab Nebula (M1) is
a. a black hole. b. a pulsar. c. a quasar. d. a white dwarf.