A lift of mass 400kg is hung by a wire. Calculate the tension in the wire when the lift is at rest.

In a normal atom, how many electrons are there compared with protons?

Rubies are used in electronics

Sodium chiorine is an ionic compound. If you drop a large crystal of sodium chloride on the floor. What would happen

Assume that a 15-kg ball moving at 8 m/s strikes a wall perpendicularly and rebounds elastically at the same speed. What is the amount of impulse given to the wall?

Which quantities decrease as the distance between a planet and the Sun increases? Check all that apply. tangential speed mass gravitational force area swept out in a day distance traveled in a day

What amount of heat is required to raise the temperature of 25 grams of copper to cause a 15º C change? The specific heat of copper is 0.39 J/gº C. 115 J 150 J 250 J 300 J

Plasma is the most abundant state of matter in the universe

What environmental effects are shared by all fossil fuels

Joseph runs 40 yards In 2.5 seconds. What Is Joseph's speed?

Unlike gases, water exerts no pressure. If there's a structural problem on a submarine, the submarine is not likely to be crushed as it descends. True or False?