In which of these cases is NO work done on the football? A) You lift a football off the ground. B) You raise a football over your head. C) You carry a football across a field. D) You push a football across the floor.

What type of potential energy does a roller coaster have? Explain

A car at a stoplight has a velocity of 0 km/hr. three seconds after the light turns green, the car has a velocity of 30 km/hr. what is the acceleration of the car?

A typical internal combustion gasoline engine is only about 25% efficient. What happens to the other 75% of the energy? A. It remains in the fuel. B. It is converted to unusable forms of energy. C. It is converted to other usable forms of energy. D.

You need to purchase a motor to supply 400 joules [J] in 10 seconds [s]. All of the motors you can choose from are 80% efficient. What is the minimum wattage [W] on the motor you need to choose

A transfer of heat within a liquid or gas that involves warm particles moving in currents is - A. connection. B. convection. C. conduction. D. correction.

A tow truck pulls a 500 kg car so that the car accelerates 2 m/s2. What is the net force on the car? 250 N 498 N 1000 N 502 N

Which force keeps you near earths surface?

Name one process that requires a force in the human body.

Which describes the electric forces inside an atom

Why can radio telescopes be used 24 hours a day?