In a automobile brake test the driver slammed on the brakes to see how long it would take the car to stop completely. see the graph. about what was the average speed of the car during the first 2 seconds of braking? a) 41 m/s b) 50 m/s c) 72 m/s d) 80 m/s

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

Talia is manufacturing rolls of wire for hanging pictures. she needs a material that is so that it can easily be pulled into wire without breaking.