Does a good insulator prevent energy from getting through it, or slow its passage

An electroscope is charged by touching its top with positive glass rod. The electroscope leaves spread apart and the glass rod is removed. Then a negatively charged plastic rod is brought close to the top of the electroscope, but it does not touch.

You are in the bleachers at the World Series and a game winning baseball (mass 0.15 kg) approaches at 28 m/s. You want to catch it, but you don't want to hurt your had since that might impede your ability to do physics homework.

How far can light travel in one year? a. 10 trillion km b. 300,000 km c. 30 million km d. 100 billion km

Threshold potential refers to the membrane potential required to: A. initiate an action potential and open voltage-gated sodium ion channels. B. initiate an action potential. C. open voltage-gated sodium ion channels. D.

On June 9, 1983, the lower part of the Variegated Glacier in Alaska was observed to be moving at a rate of 64 m per day. What is this speed in kilometers per hour?

What factors determine whether a collision between two reactant molecules will result in a reaction?

As you brake your bicycle, your velocity changes from 20 east m/s to 10 east m/s in 5 seconds. What is your acceleration?

Some ancient civilizations used units of measure based on the length of certain seeds. what kind of problems might you expect with such a system?

You are standing on the SCALE The scale is on the floor. What are the forces on the SCALE?

which of the following is an example of a compound machine. a. a bicycle chain. b. a coffee mug. c. a paper cutter