The total kinetic plus potential energy of a body
a. can be negative.
b. always stays constant if the body is freely falling.
c. always stays constant if friction is acting.
d. can remain constant even if the body's speed is decreasing.
a, b, d
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All water—groundwater, surface water, and frozen water—flows downslope in response to
A) pressure. B) hydraulic gradient. C) permeability. D) gravity.
The ?0 meson has a mass of 264 times that of an electron
What is the approximate range of the force mediated by this particle? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 1.5 × 10-14 m B) 1.5 × 10-10 m C) 1.5 × 10-12 m D) 1.5 × 10-15 m
The focal lengths of the objective lens and the eyepiece of a microscope are 0.50 cm and 2.0 cm, respectively,
and their separation adjusted for minimum eyestrain is 6.0 cm. If the microscope is focused on a small object, what is the distance between the object and the objective lens? A) 0.31 cm B) 0.42 cm C) 0.49 cm D) 0.57 cm E) 0.73 cm
The motion of a Foucault pendulum proves that Earth is
a. rotating. b. revolving. c. precessing. d. an oblate spheroid.