a 45kg box of books is lifted o a bookself 1.75 m above the floor. how much work was done to lift the books?

Which statement best describes the law of conservation of energy? a. Energy can be destroyed but not created. b. We need to conserve our natural resources. c. Energy cannot be created or destroyed. d.

An electron and a proton

Salt water has greater density than fresh water. A boat floats in both fresh water and in salt 12) water. Where is the buoyant force greater on the boat?

List four ways of separate a mixture

First answer gets Brainliest! Which of the following statements describes the difference between physical and chemical weathering? A. Physical weathering affects rocks, while chemical weathering affects only minerals. B.

A group of two or more stars is called a A. solar system B. neutron star C. protostar D. star system

Which of the following is an example of potential energy? View Available Hint (s) Which of the following is an example of potential energy?

What type of material is wrapped around an object could cause the object to lose the most heat

What is the importance of the ozone layer?

Which of the following is an example of plasma?