Apipe 0.490 m long and closed at one end is filled with an unknown gas. the third lowest harmonic frequency for the pipe is 790 hz.
(a) what is the speed of sound in the unknown gas?
(b) what is the fundamental frequency for this pipe when it is filled with the unknown gas?
(a) number 374 units m/s
(b) number 257 units hz

In a system, when potential energy decreases, then entropy also decreases. true false

Ethanol has a heat of vaporization of 38.56 kj/mol and a normal boiling point of 78.4 c. what is the vapor pressure of ethanol at 14 c?

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.