What is the kinetic energy of a 10kg object moving at 2.0m/s?

What kind of reaction occurs when potassium is placed in water? a. a single-displacement reaction c. a decomposition reaction b. a double-displacement reaction d. electrolysis

A post is wrapped two full turns around with a belt. The tension in the belt is 7500 N by exerting a force of 150 N on its free end. Determine the coefficient of static friction between the belt and the post.

How do the charges compare when two objects are charged through friction? A. The objects become oppositely charged and have equal amounts of charge. B. The objects become positively charged and have equal amounts of charge. C.

A 60-gallon water heater is initially filled with water at 66°F. Determine how much energy, in Btu, needs to be transferred to the water to raise its temperature to 104°F. Given: The water properties at an average water temperature of 85ºF rho = 62.

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.032.03 times a second. A tack is stuck in the tire at a distance of 0.357 m0.357 m from the rotation axis.

A machine called a centrifuge is used in

Suppose the skin temperature of a naked person is 34°C when the person is standing inside a room whose temperature is 26°C. The skin area of the individual is 1.2 m2. (a) Assuming the emissivity is 0.

Which of the following is NOT a way to increase energy efficiency? a. putting insulation in your home c. using public transportation b. recycling d. using low heat lightbulbs

A 20kg child lifts his 0.5kg ball of the floor to put it away on his bookshelf 1.5 meters above the ground. How much work has he done?

When you touch a hot object, a reflex controls your movements. but how do you know the object was hot?