Plutonium-239 and uranium-235 undergo fission when bombarded by
a. protons.
b. neutrons.
c. alpha particles.
d. electrons.
b
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What evidence suggests that life arises relatively easily?
A) Life was present on Earth soon after the end of the heavy bombardment. B) Life is currently present in extreme environments like deep ocean volcanic vents. C) All organisms on Earth use DNA as their genetic material. D) Tardigrades, small animals, can survive exposure to the near-vacuum of space.
An American football field, including end zones, is 360 feet long and 160 feet wide. If you needed to describe it for someone in Europe using the metric system,
which one of the following quantities would be closest to its area in square meters? (2.54 cm = 1.00 in.) A) 4,920 m2 B) 5,350 m2 C) 88.0 m2 D) 12,100 m2 E) 13,200 m2
A piano wire of length 1.5 m vibrates so that one-half wavelength is contained on the string. If the frequency of vibration is 65 Hz, the amplitude of vibration is 3.0 mm, and the density is 15 g/m, how much energy is transmitted per second down the wire?
a. 21 W b. 11 W c. 5.4 W d. 2.2 W e. 1.1 W
Minimal orbit speed about Earth is about 8 km/s, and about Jupiter is
A) less than 8 km/s. B) more than 8 km/s. C) about 8 km/s.