Two identical 2.55x10^-4 C charges are held 0.500 m apart. The second one is released. When it reaches a distance of 2.15 m from the other charge, how much has the electric potential energy changed?

(Unit=J)

A lever with an input arm of 2 meters high has a mechanical advantage of 4 what is the output arm's length

What is the acceleration a of the refrigerator 4 s after the person begins pushing on it with a force of 400 n?

When the air under the envelope is heated, the balloon lifts. Which of the following statements is true?

A block pushed with a force of 27 N accelerates at 5 m/s2. What is the mass of the block?

hen a constant force acts upon an object, the acceleration of the object varies inversely with its mass. When a certain constant force acts upon an object with mass, the acceleration of the object is.

How do mountins building and volcanos relate to plate motion at convergent boundaries

A 20kg box is dropped 13m. how much work is done

Suppose a person whose mass is m is being held up against the wall with a constant tangential velocity v greater than the minimum necessary. Find the magnitude of the frictional force between the person and the wall

A ball is being rolled by a normal push of 1000N. it is opposed by friction which has a force of 0.3kN and air resistance which has a force of 23N. Calculate the resultant force.

Consider a Young's two-slit experiment in which the wavelength of light is 37% smaller than the distance between the slits.