A woman riding a ski lift with a constant velocity of 2.1 m/s up to the top of the hill suddenly hears a loud noise. As she turns to see a fighter jet doing acrobatics involving sharp turns, she accidentally knocks her skis off the lift. In the moment afterwards, which two objects have the same inertial frame of reference? A) the skier and her skis
B) the pilot and the jet
C) the skis and the ground
D) the skier and the lift

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.