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.

All valid equations in physics have consistent units. Are all equations that have consistent units valid? a. No. Any equation can be made to have consistent units through unit conversion. b. Yes.

How do the NGSS use Crosscutting Concepts in a new way?

Assuming 70% of Earth's surface is covered in water at an average depth of 2.5 mi, estimate the mass of the water on Earth in Kilograms.

Once a satelite has entered a stable orbit round earth why does it not need fuel?

Justify why does a bird flap its wing to fly higher?

Can rocks be weathered by wind and chemicals in the air

1. if you rub a neutral glass rod with silk, the silk acquires a negative charge. if you rub a neutral glass rob with a rubber rob, the rubber rod acquired a negative charge.

What's a scientific inquiry

Calculate work If force of 50 Newton's and distance is 6 meters.

What heats up hot chocolate faster? milk or water?