As a car moves forward on a level road at constant velocity, the net force acting on the tires is:
a. greater than the normal force times the coefficient of static friction.
b. equal to the normal force times the coefficient of static friction.
c. the normal force times the coefficient of kinetic friction.
d. zero.
d
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A container with rigid walls is filled with 4 mol of air with CV = 2.5R. How much does the internal (thermal) energy change if the temperature of the air rises from 16°C to 437°C? The ideal gas constant is R = 8.314 J/mol ? K
A) 35 kJ B) 421 J C) 3.5 kJ D) 8.75 kJ
A rock's initial melting temperature is primarily determined by
A) the rocks mineralogy. B) its water content. C) its internal temperature. D) its heat source.
Object and image for a plane mirror occur
A) along the same plane. B) equal distances from the mirror. C) at right angles to each other. D) all of the above E) none of the above
Which of these is emitted when an electron falls from a higher to lower orbital?
A) a photon B) a positron C) a neutrino D) a graviton E) another electron