A mole of oxygen (O2 ) molecules and a mole of carbon dioxide (CO2 ) molecules at the same temperature and pressure have
A) the same number of atoms.
B) different average kinetic energy per molecule.
C) the same number of molecules.
D) the same average molecular speeds.
E) different volumes.
C
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A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
a. +2.0 J b. +20 J c. ?2.0 J d. ?20 J e. +40 J
Five boys are pushing on a snowball, and each is pushing with a force of 20.0 N. However, each boy is pushing in a different direction. They are pushing north, northeast, east, southeast, and south. (Each boy is pushing at an angle of 45.0° relative to his neighbor.) What is the magnitude of the total force on the ball?
a. 54.2 N c. 24.1 N b. 48.3 N d. 0 N
A negative charge, if free, tries to move
A) from high potential to low potential. B) from low potential to high potential. C) toward infinity. D) away from infinity. E) in the direction of the electric field.
A 100-kg student eats a 200-Calorie doughnut. To "burn it off", he decides to climb the steps of a tall building. How high (in m) would he have to climb to expend an equivalent amount of work? (1 food Calorie = 103 calories.)
a. 273 b. 623 c. 418 d. 854 e. 8 400