The weak magnetic field of Europa may originate from a rapidly rotating liquid iron core
Indicate whether the statement is true or false
FALSE
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Which statement about photons is true?
A) An infrared photon has less energy than an x-ray photon, but travels at the same speed. B) An infrared photon has less energy than an x-ray photon, and travels more slowly. C) An infrared photon has more energy than an x-ray photon, and travels more quickly. D) An infrared photon has more energy than an x-ray photon, but travels at the same speed.
Approximately how many times does an average human heart beat in a lifetime?
A) 3 × 1011 B) 3 × 1010 C) 3 × 109 D) 3 × 108 E) 4 × 107
A baseball catcher puts on an exhibition by catching a 0.200-kg ball dropped from a helicopter at a height of 150 m above the catcher. If the catcher "gives" with the ball for a distance of 0.755 m while catching it, what average force is exerted on the mitt by the ball? (g = 9.80 m/s2)
a. 39.7 N b. 294 N c. 389 N d. 399 N e. 1110 N
Fresh water enters the ocean by runoff from streams and rivers,
A) precipitation of rain over the ocean, and evaporation of coastal waters. B) evaporation of surface water, and melting of glacial ice. C) precipitation, and melting of glacial ice. D) none of these