Who made the very first solar cell and in what year?

In this lab you will be given two polaroid sheets with unlabeled transmission axes. How can you tell, when looking through both polaroid sheets at the same time, if the transmission axes are crossed? 1.

Electrons are modeled using a "cloud" around the nucleus because they A) can not be precisely located. B) travel at the speed of light. C) exist in many places at once. D) move in an orbit about the nucleus.

Universal ethical standards also apply to international businesses. a. true b. false

What happens when two positive charges are near each other?

A cannon launches a 4.0kg bowling ball with 50J of kinetic energy what is the bowling ball's speed

How does friction affect all moving objects?

A force of 5N compresses a spring by 4cm. Find the force constant of the spring.

Which of the following equations are balanced correctly? A: Cu + H2O → CuO + H2 B: Zn + HCl → ZnCl2 + H2 C: 2C4H10 + 13O2 → 8CO2 + 10H2O D: 2Ag2O → 4Ag + O2

Two identical objects are moving directly toward one another at the same speed v. ~v - ~v m m What is the total kinetic energy of the system of the two objects?

Why would a long series of gradual ramps be better than one short, steep ramp for moving heavy blocks of stone?