Which is the correct definition of a chemical reaction? A. Substances are mixed together. B. Substances interact to form new substances. C. Things change color. D. Substances melt.

You drag a (n) 17.4 kg steamer trunk over a rough surface by a constant force of 173 N acting at an angle of 31.5 ◦ above the horizontal. You move the trunk over a distance of 13.4 m in a straight line, and the coefficient of kinetic friction is 0.

What separates the crust to the mantle?

An object of mass 40 kg is raised to a height of 5 m above the ground. what isnits potential energy? if the abject is allowed to fall, find its kinetic energy when itbis half way down (g=10m/s)

A 0.25 kg hockey puck is sliding along the ice with an initial velocity of 5 m/s when a player strikes it with his stick, causing it to reverse its direction and giving it a velocity of 30 m/s.

Recall that in the equilibrium position, the upward force of the spring balances the force of gravity on the weight.

Which of these is the most effective way for manny to cool down after kickboxing? start static stretches to increase his flexibility walk around to lower his heart rate sit and catch his breath to avoid light-headedness run one to three miles to

One of the driving forces of plate motion is: A. volcanic eruptions along coastlines B. meteor impacts in the ocean basins C. convection currents in the mantle D. hot liquid magma in the inner core

Which element is required for the combustion of fossil fuels? nitrogen hydrogen oxygen carbon

When air pressure is lower what happens to a balloon filled with air

Determine the power input for a motor necessary to lift 300 lb at a constant rate of 7 ft/s. the efficiency of the motor is ϵ = 0.65.