What of these is the largest contributor to the average annual radiation dose? (See Table 25-5 for relevant data.)

a. Exposure during medical procedures.
b. Radioactive isotopes of potassium in our bodies.
c. Cosmic rays.
d. Radon.
e. Nuclear power.


d

Physics & Space Science

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A marble has a diameter of 2 cm. At what distance would the marble have an angular diameter of 1 arc second

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Identify the FALSE statement. Asteroids:

are rocky or metallic bodies, meters to kilometers in diameter. orbit in a belt between Jupiter and Saturn. probably didn't accrete into a planet because Jupiter's gravity interfered. are irregular in shape, not spherical. number in the millions.

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How many more times is the atmospheric pressure in Jupiter's core greater than the atmospheric pressure at Earth's surface?

A) 100 thousand B) 100 million C) 1 million D) 10 thousand E) 10 million

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A 4.0-kg mass has a velocity of 4.0 m/s, east when it explodes into two 2.0-kg masses. After the explosion one of the masses has a velocity of 3.0 m/s at an angle of 60° north of east. What is the magnitude of the velocity of the other mass after the explosion?

a. 7.9 m/s b. 8.9 m/s c. 7.0 m/s d. 6.1 m/s e. 6.7 m/s

Physics & Space Science