Why are airbags, helmets, and other safety devices important? Physics

Which of the following supplies the heat for the hot reservoir in a car's engine? mixing gasoline with air cooling the exhaust gases igniting the gas-air mixture venting the exhaust gases

By what factor would a person's weight be increased if Earth had 10 times its present mass, but the same volume?

Some students fire a rocket of mass 0.150kg into the air. If at the top of it's flight it has a gravitational potential energy of 150J, What height did it reach?

What is the moho? a. the boundary between the outer and inner core b. the boundary between the crust and the mantle c. the material of which the mantle is composed d. an area of the mantle that will not transmit seismic waves?

A mule pulls a cart of milk 10 meters with a force of 50 Newton's. Calculate the work done by a mule

Whats an example of projectile motion

The fact that the sun rises and sets at different times during the day depending on the time of year is an example of a data trend. True or False

What sample of matter is a single substance

What is a hydraulic machine and what is its purpose? Explain how a simple hydraulic machine performs work.

Is the muzzle velocity a scalar or vector quantity?