Everyone receives background radiation. This comes from various sources; the ground, medical procedures, radon in the air, etc. On the average, people in the United States receive about

A. a mrem of radiation a day
B. 300 mrems of radiation a day
C. A rad of radiation a day


A. a mrem of radiation a day

Physics & Space Science

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Astronaut Jennifer's lifeline to her spaceship comes loose and she finds herself stranded, "floating" 100 m from the mothership. She suddenly throws her 2.00-kg wrench at 20 m/s in a direction away from the ship

If she and her spacesuit have a combined mass of 200 kg, how long does it take her to coast back to her spaceship? A) 1000 s B) 750 s C) 500 s D) 250 s E) 2.50 min

Physics & Space Science

The position of an air-track cart that is oscillating on a spring is given by the equation x = (12.4 cm) cos[(6.35 s-1)t]. At what value of t after t = 0.00 s is the cart first located at x = 8.47 cm?

A) 7.39 s B) 7.75 s C) 4.34 s D) 0.108 s E) 0.129 s

Physics & Space Science

A marshmallow in a vacuum becomes

A) larger. B) smaller. C) does not change.

Physics & Space Science

A particle with charge q is located inside a cubical gaussian surface. No other charges are nearby. If the particle can be moved to any point within the cube, what maximum value can the flux through one face approach?

1. 0 2. q/2?0 3. q/6 ?0 4. q/8 ?0 5. depends on the size of the cube

Physics & Space Science