What is the efficiency of a tractor that has a work output of 300j and a work input of 400j

A gust of wind blows an apple from a tree. As the apple falls, the force of gravity on the apple is 9.39 N downward, and the force of the wind on the apple is 1.54 N to the right. What is the magnitude of the net external force on the apple?

A propagating wave in space with electric and magnetic components. These components oscillate at right angles to each other. It may travel in a vacuum.

A likely future model for the electrical grid is a decentralized system where power is generated from numerous sources distributed across the grid. What would the primary role of nuclear power be in this model?

a 0.2kg ball rotates at a constant speed of 3 m/s on the end of 1.2 m long string. what is the centripetal acceleration of the object?

What will happen to the pressure of a container of gas if the volume of the gas is tripled and the temperature is doubled?

The direction of the magnetic field is determined by which of the following? A. energy of the current B. magnetic domain C. magnetic force D. direction of the current

A ship is traveling at 154 m/s and accelerates at a rate of 1.80 m/s^2 for 1 minute. What will its speed be after that minute? Calculate the answer in both meters per second and kilometers per hour.

Gerry is looking at salt under a powerful microscope and notice a crystalline structure. what can be known about the salt sample that Gerry is looking at

The kinetic energy of a moving object is equal to the work required to bring it to its speed from rest, or the work the object can do while being brought to rest.

Imagine standing on a bathroom scale and reading your weight. now lift one foot and read your weight again. does the scale read more, less or the same weight when you are standing on one foot?