A 50-kg ice skater moving at 6 m/s collides with a second stationary skater with mass 70 kg. The skaters cling together after the collision and move without friction. Compute their speed after the collision
2.5 m/s
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For each 4He produced in a proton-proton chain, _____
A) the first reaction must occur four times. B) the first and second reactions must occur twice. C) the second and third reactions must occur four times. D) the third reaction must occur twice.
Intensity: A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions. What is the average intensity of the light from this bulb at a distance of 0.400 m from the bulb?
A. 14.9 W/m2 B. 37.2 W/m2 C. 27.4 W/m2 D. 11.9 W/m2 E. 29.8 W/m2
Interstellar dust consists mostly of
A) ozone "smog." B) microscopic particles of carbon and silicon. C) hydrogen and helium atoms. D) tiny grains of water ice. E) the same tiny particles found in household dust.
All of the stars we see at night with our unaided eyes are within
A) 10,000 light-years, which is a small portion of our galaxy. B) 100,000 light-years, which encompasses most all of our galaxy. C) 5 million light-years, which encompasses our local group. D) 14 billion light-years, which encompasses the observable universe.