On a position-time graph, the slope of the straight line joining two points on the plotted curve that are separated in time by the interval Dt, is which of the following quantities?
a. average steepness
c. instantaneous velocity
b. average velocity
d. average acceleration
B
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A hypothesis that has been repeatedly and rigorously tested and supported is known as a:
a. model b. testable prediction c. scientific method d. scientific theory e. result
As a body cools, its ________ decreases.
A. brightness B. total emitted energy C. internal energy D. All of these choices are correct.
A packing crate slides down an inclined ramp at constant velocity. Thus we can deduce that
A) a frictional force is acting on it. B) a net downward force is acting on it. C) a net upward force is acting on it. D) it is not acted on by appreciable normal force. E) it is not acted on by appreciable gravitational force.
What is the energy of a photon that has a wavelength equal to the de Broglie wavelength of a proton having a speed of 7.1 × m/s? (mproton = 1.67 × 10-27 kg, c = 3.00 × 108 m/s)
A) 220 keV B) 150 keV C) 290 keV D) 360 keV E) 440 keV