The Earth's lower atmosphere is kept warm by
A) solar radiation.
B) terrestrial radiation.
C) short-wave radiation.
Answer: B
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An 8.0 kg-m2 wheel with 155. Joules of rotational kinetic energy requires what torque to bring it to rest in 4.0 s?
A) -1.6 N-m B) -1.2 N-m C) +0.88 N-m D) -1.8 N-m E) -1.0 N-m
Which of the following types of electromagnetic radiation has the lowest energy?
a. X-rays b. visible light c. ultraviolet d. gamma rays e. infrared radiation
When a high-velocity beam of electrons is bent by a magnetic field, relativistic effects
A) increase momentum beyond its classical value. B) reduce the angle at which the beam is bent. C) both of these D) neither of these
Consider a sphere with a positive charge uniformly distributed on its surface. The sphere spins clockwise around the z axis. The magnetic field this sphere creates is
A. unidirectional. B. circular. C. radial. D. None of the above.