What is the ratio of the velocity of sound in helium gas to that in air at the same pressure and temperature? Molar mass of helium is 0.004 kg. = 1.66. On the basis of your answer, can you explain why you will sound funny if you happen to inhale helium gas and speak?

An object thrown vertically upward from the surface of a celestial body at a velocity of 36 m/s reaches a height of sequalsminus0.9tsquaredplus36t meters in t seconds. a. determine the velocity v of the object after t seconds. b. when does the object reach its highest point? c. what is the height of the object at the highest point? d. when does the object strike the ground? e. with what velocity does the object strike the ground? f. on what intervals is the speed increasing?

Select the three ways that the parallel-plate capacitor differs from a car battery.

In a series circuit the __ is the same at every point