What are two types of electrical contact?

a force of 9.0N is applied to a body at rest on a smooth horizontal surface. if the body has a mass of 18.0Kg and it moves in the direction of the force, find the workdone in (a) the first four seconds. (b) the fourth second

A lump of clay whose rest mass is 4 kg is travelling at three-fifths the speed of light when it collides head-on with an identical lump going the opposite direction at the same speed.

Which change is the best example of a physical change? (1) a cookie baking (3) ice cream melting (2) paper burning (4) a nail rusting

Select all that apply. Which statements are supported by the second law of thermodynamics? A.) The usable energy in the universe is decreasing. B.) The usable energy in the universe is increasing. C.) The energy of the universe is being destroyed. D.

This graph is accurate because A. electromagnetic waves cannot travel through a vacuum. B. mechanical waves move faster than electromagnetic waves. C. mechanical waves cannot travel through a medium. D.

Which actions are evidence that a chemical reaction has occurred? Check all that apply. A: a change in color B: the formation of a precipitate C: a clear liquid becoming cloudy D: a change in shape E: the formation of bubbles F: the formation of

Which sphere forms Earth's outermost layer? Atmosphere Biosphere Cryosphere Hydrosphere

an 100kg object traveling at 50m/s collides (perfectly inelastic) with a 50kg object initially at rest. what is the sum of the momentum of both objects prior to the collision?

A train moves at constant velocity of 50km/h. how far will it move in 0.5h?

Which process best describes part of a scientific investigation? O designing a solution O evaluating the conclusion O evaluating the solution O identifying the conclusion