A car with a mass of 1 200 kg is traveling at 62 km/hr when the driver sees a dog running across the street. He applies the brakes and 10 seconds later the car is moving at 17 km/hr. (a) Calculate the initial momentum of the car. (b) Calculate the change in momentum of the car. (c) Calculate the net force applied by the brakes of the car

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.

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