The planet whose pole was facing the Sun when Voyager 2 approached in 1986 was
A) Uranus. B) Neptune. C) Saturn. D) Jupiter. E) Mars.
A
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Earth is about 150 million km from the Sun, and the apparent brightness of the Sun in our sky is about 1,300 watts per square meter
Determine the apparent brightness we would measure for the Sun if we were located one-third of Earth's distance from the Sun.
Which of the following properties describes a low-mass star?
A) ends its life as a supernova B) late in life, fuses carbon into oxygen C) has longer lifetimes than high mass stars D) has higher main-sequence luminosities than high mass stars
A catcher arranges to catch a baseball dropped from a height 50 m above his glove. However, his friends substitute a soft 250 g red grapefruit, so that it will smash apart when he catches it. His glove stops the grapefruit in 0.010 s. What force does the glove exert on the grapefruit?
a. 0.078 3 N b. 783 N c. 2 450 N d. 24 500 N e. 78 300 N
A satellite with a rest mass of 200 kg and a speed of 0.800c and a second satellite with a rest mass of 100 kg and a speed of 0.600c are traveling toward each other in deep space
The satellites collide and somehow manage to stick together. What is the rest mass of the combined object after the collision? A) 300 kg B) 389 kg C) 416 kg D) 457 kg E) 587 kg