Nikola Tesla used rotating magnetic fields to generate, transmit, and use AC (alternating current). Today alternating current has replaced direct current in most situations. What is the advantage of using AC power over DC power?

How far can you go until you reach space?

1. A girl uses a skateboard to travel 65 meters in 25 seconds. What is her average speed?

How much heat (in kj) is required to warm 11.0 g of ice, initially at - 13.0 ∘c, to steam at 111.0 ∘c? the heat capacity of ice is 2.09 j/g⋅∘c and that of steam is 2.01 j/g⋅∘c?

Within the chain of infection, what is the reservoir? A. A way for the pathogen to enter the body B. The way for a pathogen to leave the host C. The location/place where the pathogens live and grow D. The way a pathogen can be transmitted

A can of juice had a mass of 250g. What does it weigh on earth?

The best way to prevent heat exhaustion while exercising is to

The highest frequency radio waves are which type?

When a mass is placed on a spring with a spring constant of 15 newtons per meter, the spring is compressed 0.25 meter. How much elastic potential energy is stored in the spring?

Explain why we see the Milky Way as a faint band of light stretching across the sky.

A piece of plastic tape coated with iron oxide is magnet - ized more in some parts than in others. When the tape is moved past a small coil of wire, what happens in the coil? What is a practical application of this?