A diesel engine a. uses only air during the intake stroke. b. is an external-combustion engine. c. uses a spark plug to ignite fuel. d. uses Freon.

Changes in which no new kinds of matter are produced are called

The energy content of a certain food is to be determined in a bomb calorimeter that contains 3 kg of water by burning a 2-g sample of it in the presence of 100 g of air in the reaction chamber. If the water temperature rises by 3.

True or false Hydrogen fuel cells generate electricity by combining hydrogen with oxygen.

Julio hit a baseball. What caused the ball to change direction at the time of impact? a. the force of gravity b. the speed of the ball c. the force of his swing d. the weight of the air

These types of electromagnetic waves are right next to red light on the electromagnetic spectrum: A. radio B. X rays C. infrared D. blue light

Suppose your bathroom scale reads your mass as 60 kg, with a 4% uncertainty. what is the uncertainty in your mass in kilograms?

An automatic dryer spins wet clothes at an angular speed of 5.2 rad/s. Starting from rest, the dryer reaches its operating speed with an average angular acceleration of 3.2 rad/s². How long does it take the dryer to come up to speed?

A cyclist named Carly Daugherty accelerates from 0 m/s to 8 m/s in 3 seconds. What is her acceleration? Is this acceleration higher than that of Soul Train's car, which accelerates from 0 to 30 m/s in 8 seconds? How do you know

Two 4.0kg masses are 1.0m apart on a frictionless table. Each has 1.0μC of charge. Part A What is the magnitude of the electric force on one of the masses? What is the initial acceleration of each mass if they are released and allowed to move?

When a person stands on a rotating merry-go-round the frictional force?