The 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 half the earth's distance from the Sun.
The Sun would appear four times brighter. So the apparent brightness would be 4 × 1,300 watts per square meter = 5,200 watts per square meter.
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Humans are scientifically classified as Homo sapiens. In this system, the word Homo refers to the
A) family B) genus C) order D) species
It takes 40 J to push a large crate 4 m across a floor. The force exerted on the crate is
A) 4 N. B) 10 N. C) 40 N. D) 160 N. E) 1600 N.
The following three appliances are connected in parallel across an ideal 120-V dc power source: 1200-W toaster, 650-W coffee pot, and 600-W microwave. If all were operated at the same time what total current would they draw from the source?
A) 5.0 A B) 4.0 A C) 20 A D) 10 A
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