Does electro magnetic waves require a medium to travel though one location

How o astronomers gather information to establish the hubble law?

A 4 kg block is pulled with 5.6 N of force to the right. The block experiences 1.1 N of friction. What is the acceleration of the block?

Briefly describe the layers of the earth.

What is the name of the force that opposes or slows down the motion of objects

Which one of the following light bulb produces lowest lumens per watt? A) Incandescent B) Fluorescent C) Compact fluorescent light D) Low pressure sodium

ions are atoms or groups of atoms that have a positive or negative charge. which of the following statements is true of ions?

1. According to the nebular theory, the solar system formed from? A. accretion of protoplanets. B. a large, thin cloud of dust and gas. C. colliding planetesimals. D. all of the above 2.

What is the difference between tangential acceleration and centripetal acceleration?

A ball rolls down a ramp. The ball has a mass of 1 kg and it has 18 joules of kinetic energy. What is the ball's speed?

Scientists now think high-fructose corn syrup may disrupt appetite control, making people more often o sleep get angry Ceat fast