A motorist travels south at 30 m/s for 4 minutes, then turns west and advances for 1 minute at 35 m/s, accelerating at 0.2 m/s2 and finally veers northwest when he runs out of benzine, so his speed decreases at 0,7 m/s2 until it stops completely. For this trip, calculate: a) Movement of the rider for the total journey.
b) The average speed.
c) The average speed.

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)

If a star is moving toward earth, it is