A box is lifted at a constant speed of 7.0 m/s by a machine. If the power of the machine is 21000 W, then the force applied is equal.

a rock thrown horizontally at 20m/s from the top of a building 63m high. How far from the base of the building does the rock land?

A light ray is incident on a reflecting surface. If the light ray makes a 40° angle with respect to the normal to the surface, what is the exact angle (in degrees) made by the reflected ray relative to the normal?

Electrical energy can be transformed into other types of energy. We often experience this transformation of energy in our everyday lives. In one example the intended energy transformation produces thermal energy. That is the

How was the planet neptune discovered?

John pushes his bike along the sidewalk at a constant speed. If he increases the force on the bike, what happens?

8. A gas is contained in a horizontal piston-cylinder apparatus at a pressure of 350 kPa and a volume of 0.02 m3. Determine the work done by the piston on the gas if the cylinder volume is increased to 0.15 m3 through heating.

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg) when the elevator is at rest?

The hinge at A and cable BDC support beam ABC. Cable BDC passes over the pulley D that is pinned to the ceiling. (Assume that the + x-axis is to the right and the + y-axis is up along the page.

The "zone of avoidance" a) Accounts for the absence of any planet between the orbits of Mars and Jupiter Prevents collisions between planets in the Solar System.

Electric current is ...