Which of the following statements describe sliding friction? select all that apply. 1.) a force that causes an object to increase speed2.)a force in which one of the objects involved must be a liquid or a gas3.) a force that occurs any time two objects rub against each other4.) a force used to slow the speed of a moving object5.) a force that acts in the same direction as the motion of the object

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

At an oceanside nuclear power plant, seawater is used as part of the cooling system. this raises the temperature of the water that is discharged back into the ocean. the amount that the water temperature is raised has a uniform distribution over the interval from 10° to 25° c. what is the standard deviation of the temperature increase?

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