A hovercraft of mass 83.0 kg can move on a horizontal surface, the x-y plane. A single unbalanced force acts on the hovercraft, but the size of the force is unknown. The hovercraft initially has a velocity of 4.0 m/s in the positive x direction and some time later has a velocity of 7.0 m/s in the positive y direction. How much work is done on the hovercraft by the force during this time?

1369.5 J

Explanation:

According to the work-energy theorem, the work done on an object is equal to the change in kinetic energy of the object itself.

Therefore, we can write:

where:

W is the work done on the hovercraft

m = 83.0 kg is the mass of the hovercraft

u = 4.0 m/s is the initial velocity (in the positive x-direction)

v = 7.0 m/s is the final velocity (in the positive y-direction)

Here the direction of motion of the hovercraft has changed; however, we can ignore this fact, since work is a scalar so the direction of the velocity does not matter.

Therefore, the work done by the force is:

so easy. just google the electromagnetic waves and it’ll pop up.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.