Which of the following is true about frictional forces?

A box is being pulled right with a force of 40 N left 40 N, up 10 N and down 10 N

How much heat has to be added to 508 g of copper at 22.3°C to raise the temperature of the copper to 49.8°C? (The specific heat of copper is 0.377 J/g·°C.)

This is two or more elements chemically combined in a fixed ratio. Example: water, carbon dioxide, sodium chloride

Which of the following describes a chemical change A. burning paper B. freezing water C. melting ice D. bending a wire

What three forms of kinetic energy can a polyatomic molecule have?

A 29 foot ladder leans against a building so that the angle between the ground and the ladder is 75 ∘. How high does the ladder reach up the side of the building? Round to 2 decimal places.

What is a difference between an isotope and a ion

2. An airplane travels 335 miles in 45 minutes. How fast does it travel? How fast is that in km/hr?

A falling skydiver opens his parachute. A short time later, the weight of the skydiver-parachute system and the drag force exerted on the system are equal in magnitude.

Consider the expression below. Assume m is an integer. 6m (2m + 18) Enter an expression in the box that uses the variable m and makes the equation true. (Simplify your answer completely. If no expression exists, enter DNE.)