What sample of matter is a single substance

The table shows the changes in velocity for several different cars. Each change takes place over a 10-second interval. Which cars are either speeding up or slowing down?

What causes melting of material under divergent plate boundaries?

A 60-kg box is being pushed a distance of 6.2 m across the floor by a force P with arrow whose magnitude is 150 N. The force P with arrow is parallel to the displacement of the box. The coefficient of kinetic friction is 0.21.

A current of 16.5 mA is maintained in a single circular loop with a circumference of 2.55 m. A magnetic field of 0.720 T is directed parallel to the plane of the loop. What is the magnitude of the torque exerted by the magnetic field on the loop?

Part A Does the number of particles change as the substance changes its state?

Give three examples of situations where you want as little energy as possible to be dissipated.

Which form of cell division creates the sperm and egg, resulting in half of the chromosomes as the other cells?

The effects on marijuana can last up to

A ball is dropped from an initial height and allowed to bounce repeatedly. On the first bounce (one up-and-down motion), the ball reaches a height of 32 inches. On each successive bounce, the ball reaches 75% of its previous height.

An inductor with an inductance of 3.50 H and a resistance of 8.00 Ω is connected to the terminals of a battery with an emf of 4.00 V and negligible internal resistance.