Some men were trying to push a car that had run out of gas. They applied a total force of 570 N for 2 minutes Calculate the impulse force
If the cars velocity changed from 0 m/s to 1.20 m/s, calculate the mass of the car

Explain vector addition, triangle method and parallelogram method

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.