A 10 kg box initially at rest is pulled with a 50 N horizontal force for 4 m across a level surface. The force of friction acting on the box is a constant 20 N. How much work is done by the force of friction?

When an electric current flows through a wire a magnetic field is created. To increase the power of the magnetic field you would A.

What is an incident wave, and a normal

List three devices that use electric current from batteries and three that use regular house current.

A lion accelerates from rest at a rate of 4.2 m/s. How far has the lion gone after 4 seconds?

What's the term for the idea that there aren't enough resources to satisfy everyone's wants and needs? A. Scarcity B. Consumer C. Supply D. Demand

Which statement about how light travels is true? A Light waves need a medium to travel, and they travel at the same speed even if the light source is moving.

Explain why the car reaches a top speed even though the thrust Force remains constant at 3500N

4. A helicopter is flying at a height of 1.5km. If it has 50MJ of G. P. E., what is the mass of the helicopter?

Unless otherwise posted, what is the speed limit in a school zone? florida

If you put in 10 J of work to push 1 c of charge against and electric field what will be its voltage with respect to its starting position? when released, what will be it's kinetic energy if it flies past it's starting position?