Explain why an electromagnet usually has a core of iron or steel

What is the number of complete oscillations of a wave per second

In order of fastest to slowest, how do sound waves travel through different mediums? solids > liquids > gases gases > liquids > solids solids > gases > liquids liquids > solids > gases

Suppose we imagine the sun to be about the size of a grapefruit. how big an area would the orbits of the eight planets of the solar system cover? the size of a western state (e. g.

What part of the water cycle is the ocean part of?

Why do stars fall down from the sky every time you walk by?

Which is the best example of Newton's Second Law of Motion? A student has on roller skates and he decides to push against the railing. He immediately begins to roll backwards. A small ball and a larger ball with greater mass are dropped from a roof.

Which of the following represents a car traveling 20 miles/hour? 40 miles traveled in 2 hours 60 miles traveled in 6 hours 40 miles traveled in 3 hours 10 miles traveled in 5 hours

What is micromegas consider to be

A group of scientists is trying to launch an object into orbit, and the object is traveling at 6500 m/s. Which best explains why the object will not successfully orbit Earth? A.) There is not enough air resistance to keep the object moving. B.

Why is a coin able to float on top of water in a glass