In order to change water from a solid to a liquid, energy must be

a. removed

b. created

c. added

d. destoryed

What were Niels Bohr's experiments?

A child carries a 3N book at a constant velocity 4 meters across a horizontal floor. What is the net work done?

A wire of length L is wound around an iron cylinder mounted on a base. The two ends of the wire are connected to a battery via a switch that is initially open. A metal ring with a diameter larger than that of the cylinder sits on top of the coil.

What does a control group show in an experimental investigation? the effects that the scientists are causing by manipulating variables how nature would act without manipulation by the researchers why each part of a system is related to every other

A particular grocery bag can withstand 40 N of tension force before it rips. If a shopper places 3 kg of food in the bag, what is the maximum acceleration the bag can withstand before ripping?

A wheelbarrow is an example of what type of lever

Why is it necessary to evaluate an experiment

A positive charge Q1 = 34 nC is located at the origin. A negative charge Q2 = - 5.5 nC is located on the positive x-axis p = 15 cm from the origin. Calculate the location of x axis in cm where electric field is.

What scientific question does Isaac Asimov most clearly address with his story "Runaround"? A. Should robots be allowed to marry? B, should robots be treated as members of the family? C. Can robots be trained to follow a moral code? D.

The force generated by a single muscle fiber can be increased by increasing is called