Which simple machines make up a wheelbarrow?

The ratio of the output work to input force is the _ of the machine?

When a bat strikes a ball, the force exerted can send the bat backwards. The force exerted on the bat is due to Newton's II law.

In a simple model of the hydrogen atom, the electron moves in a circular orbit, of radius 0.053nm, around a stationary proton. How many revolutions per second does the electron make?

Many scientists accept a theory about the origin of the universe, called the big bang theory. describe at least one piece of scientific evidence that is used to support this theory of the origin of the universe.

A nonzero net force acts on a particle and does work. Which one of the following statements is true? A. The kinetic energy of the particle changes, but the speed of the particle does not change. B.

Which of the following is a vector quantity? A. 83 ounces of liquid B. 55 km/hr in a truck C. 15 seconds of travel D. 10 m/s down

Which of the following best describes the ultraviolet catastrophe of blackbody radiation? A. As energy is added to an object acting as a blackbody radiator, its emissions move to the ultraviolet part of the electromagnetic spectrum. B.

Is an engine-activated booster unit that reduces the effort required to apply the hydraulic brakes

A box is lowered using a rope. If the acceleration of the box, is 2.5 m/s2 (downward) and the tension in the rope is 31 N, what is the mass of the box (in kg) ?

On a very hot summer day, the rooms on the first floor of a house stay cooler than the rooms on the second. Which form of thermal energy flow causes this to occur? A) Conduction B) Convection C) Kinetic D) Radiation