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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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 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.
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.
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