If there are 146 neutrons in 238U, how many neutrons are found in the nucleus of 235U?
a. 141
b. 143
c. 145
d. 147
b
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The type of radio wave that produces the least static in a radio receiver is
A) AM. B) FM. C) neither of these
Find the orbital speed of an ice cube in the rings of Saturn. The mass of Saturn is 5.68 x 1026 kg, and use an orbital radius of 1.00 x 105 km. (G = 6.67 × 10-11 N ? m2/kg2 )
A) 19.5 km/s B) 27.5 km/s C) 13.8 km/s D) 9.40 km/s
During which of the following phases of life is a star's pressure and gravity out of equilibrium?
A) main sequence B) helium core fusion C) white dwarf D) red giant E) A star is never out of equilibrium.
A 5.0-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.6 m/s2 . What is the tension in the string?
a. 49 N b. 36 N c. 62 N d. 13 N e. 52 N