If a force always acts perpendicular to an object's direction of motion, that force cannot change the object's kinetic energy
A) True B) False
A
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The wavelength in air (temperature of 20°C) of a sound wave of frequency 0.50 kHz is
A) 0.68 m. B) 0.75 m. C) 2.0 m. D) 1.5 m. E) 1.8 m.
How small a time interval is needed for a good calculation of instantaneous speed?
a. Instantaneous speed is calculated for a single instant. b. Three days is small enough. c. Use the longest interval of travel to avoid numerical error. d. An interval short enough so that the answer won't change very much if you use a shorter one. e. A single second is short enough.
If the source moves, the wavelength of the sound in front of the direction of motion is smaller than the wavelength behind the direction of motion
Indicate whether the statement is true or false
Arrange the strong (S), electromagnetic (EM), weak (W), and gravitational (G) forces from weakest to strongest.
A. W, G, EM, S B. W, G, S, EM C. G, W, S, EM D. G, W, EM, S E. W, S, G, EM