What causes some materials to have magnetic field

What is density an example of?

A mutation causes a dog to be born with a tail that is shorter than normal. Which best describes this mutation?

A total distance of 4.5km. The overall journey takes 0.62h, whats the average velocity

A wave has a wavelength of 9mm and a frequency of 19 hertz. What is its speed? Edit:: Answer is 171 mm/s

You wish to cook some pasta and so take some water and heat it on a stove. If you use 2000 grams of water with an initial temperature of zero degrees C, how much energy would you need to add to raise the temperature to 100° C is all of the stove

Which of the following diagnostic procedures uses ultrasound?

Why is it easier to read black text on a white background than to read green text of any light color?

If object A has more mass than object B, does object A contain more matter? Explain.

Describe a beach that was near stormy seas and powerful waves

We all depend on electricity. Most electricity is created by electromagnetic generators at large power plants and distributed through an electric grid.