A black hole is a star that has

begun to collapse in on itself

too little gravity to emit light

gotten to the middle of its life

become too bright to see

Which statement correctly describes a chemical reaction? Reactants come out of a reaction. Energy is always released. Bonds between atoms break and new bonds form. Products go into a reaction.

A skier has decided that on each trip down a slope, she will do 3 more jumps than before. On her first trip she did 5 jumps.

Lee pushes horizontally with a force of 68 N on a 25 kg mass for 30 m across a floor. Calculate the amount of work Lee did. Answer in units of J.

Matter is made up of the elementary particles leptons and hadrons. true or false

How many electrons must be removed from a neutral object to leave a net charge of 0.500 μc?

A bathroom scale is compressed 0.21 in. when a 210 -lb person stands on it. Assuming that the scale behaves like a spring that obeys Hooke's law, how much does someone who compresses the scale 0.06 in.

Explain what happens when a ferromagnetic material is made into a permanent magnet.

You are drawing a branching diagram to show the relationship between Turtles frogs and alligators which two organisms does the diagram indicateas having the most recent common ancestor

Estimate the length of the neptunian year using the fact that the earth is 1.50Ã108km from the sun on average.

Identify one type of electromagnetic energy that has a shorter wave length than green light