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Question 2
The root-mean-square speed (thermal speed) of a certain sample of carbon dioxide molecules, with
a molecular weight of 44 g/mol, is 396 m/s. What is the root-mean-square speed (thermal speed) of
water vapor molecules, with a molecular weight of 18 g/mol, at the same temperature?
(1) 253 m s.
(2) 396 m s.
(3) 421 m s.
(4) 619 ms.
(6) None of the above,

1point) a skydiver weighing 130 lb (including equipment) falls vertically downward from an altitude of 14,000 ft and opens the parachute after 20 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.85|v|0.85|v| when the parachute is closed and is of magnitude 17|v|17|v| when the parachute is open, where the velocity vv is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. find the speed of the skydiver when the parachute opens. speed is 150.6121788 ft/s find the skydiver's height when the parachute opens. height is 2338.98591 ft find the limiting velocity vlvl after the parachute opens. (think about whether this should be positive or negative.) vl=vl= 7.647 ft/s

Velocity is a description of both speed and direction, therefore it - a vector - a force arrow - the same as acceleration - a magnitude

Properties seen when one one substance changes to another are known as properties