What is one characteristic of a sample of matter that indicates it is a pure substance?

1. Tonya had a hard time deciding between the Big Burger and the Crispy Chicken sandwiches, her two favorites. She chose the chicken because she had more recently had a burger. What was her opportunity cost?

How do electromagnetic forces work?

Choose the best answer for each situation. A scientist with the EPA examining water for contamination writes down that there was an iridescent sheen on the surface of the water. What type of data did the scientist record?

A disk with moment of inertia I relative to a vertical axis through its center is dropped onto another disk with moment of inertia equal to 2I which is rotating with angular velocity. Find the final angular velocity in terms of.

Notice that we have the weight of the crane exerting a torque about the front wheels of the same crane. to create a torque, a force must be present, so it would seem that somehow the weight of the crane is exerting a force upon its front wheels.

Which phases of matter do molecules have the lowest amount of energy?

How many Oxygen (O) atoms are in the following? H2O + CO2 4 3 2

How does surface roughness affect friction

Why does it hurt your hands when you carry heavy shopping in carrier bags?

Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?