Which of the following is not a standard metric unit?
a. Kilogram
b. Meter
c. Second
d. Gram
d
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What is the difference in meaning between the terms weather and climate?
A) Weather refers to local conditions, and climate refers to global conditions. B) Weather refers to short-term variations in conditions, and climate refers to long-term variations in conditions. C) Weather refers to small storms, and climate refers to large storms. D) Weather refers to wind and rain, and climate refers to processes like convection. E) There is no difference between weather and climate.
A stone is thrown vertically upward. At the top of its vertical path the force acting on it is
A) zero. B) only the force due to gravity. C) due to air resistance. D) both due to gravity and air resistance.
Two charged bodies separated by a distance d exert a repulsive electrical force on each other. The signs of the charges on the two bodies might be
a. + and +. b. – and –. c. + and –. d. any of the above. e. not determinable.
An alpha particle is emitted from a radioactive source with an energy of 5 MeV. How fast is it moving (in m/s)? (m = 4.002 603 u, 1 u = 1.66 × 10^-27 kg.)
a. 2.4 × 10^7 b. 1.6 × 10^7 c. 3.7 × 10^7 d. 4.6 × 10^7 e. 2.1 × 10^7