The minimum energy needed to produce a positron is
a. 3 MeV
b. 2 MeV
c. 1 MeV
d. 4 MeV
e. 0.51 MeV
e
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The densely packed neutrons of a neutron star cannot balance the inward pull of gravity if the total mass is:
A) less than 1.0 solar masses. B) greater than Schwartzschild's limit of 3 solar masses. C) Chandrasekhar's limit of 1.4 solar masses. D) between 1.4 and 2.0 solar masses. E) greater than 25 solar masses.
What is the minimum amount of energy required for a 70.0-kg climber carrying a 20.0-kg pack to climb Mt. Everest, which is 8850 m high?
a. 8.67 MJ c. 4.41 MJ b. 7.81 MJ d. 0.900 MJ
The maximum displacement of a mass attached to a spring is 0.122 m, while its highest acceleration is 0.953 m/s2. What is its maximum speed?
A) 0.358 m/s B) 0.108 m/s C) 0.831 m/s D) 0.341 m/s E) 0.538 m/s
Warm air has a higher capacity for water vapor, because in warm air
A) fast-moving water-vapor molecules are too energetic to stick together. B) molecules expand. C) water-vapor molecules condense. D) there are more water vapor molecules than in cool air.