A mass is suspended vertically from a spring so it is at rest at the equilibrium position. The mass is pulled straight down to an extension x and released so that it oscillates about the equilibrium position. The speed of the mass is greatest when the mass is
A. at its maximum upward travel.
B. at the equilibrium point.
C. at its maximum lower travel.
D. somewhere between the equilibrium point and maximum extension.
B. at the equilibrium point.
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Work Done by a Gas: A gas expands from an initial volume of 0.040 m3 to a final volume of 0.085 m3 while its pressure increases linearly with the volume (so that the process follows a straight-line path in a pV diagram) from 110 kPa to 225 kPa. How much work is done by the gas during this expansion?
A. 5.2 kJ B. 7.5 kJ C. 7.8 kJ D. 11 kJ E. 12 kJ
Water ripples are produced by making a cork oscillate up and down at a frequency of 5 Hz. The peaks of the ripples are 0.03 meters apart. What is the speed of the water ripples?
A solid object floats in water with three-fourths of its volume beneath the surface. What is the object's density? The density of water is 1000 kg/m3
A) 1333 kg/m3 B) 1000 kg/m3 C) 750 kg/m3 D) 250 kg/m3
When we consider a thin horizontal layer of the atmosphere, of thickness dy, of area A, with pressure P on the bottom, with an average mass m per molecule, and nV molecules per unit volume, the magnitude of the difference of the pressure at the top and bottom of the layer is given by dP =
a. mgdy. b. mgnVdy. c. mgAdy. d. mgnVAdy. e. mgnVAPdy.