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
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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
a. 4.1 cm b. 4.1 miles c. 4.1 m d. 4.1 ft e. 4.1 km
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.
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
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