To begin a fission reaction, a neutron is shot at high speed into the nucleus of an atom of Uranium-235. This process releases a large amount of energy contained within the nucleus. The diagram above illustrates this process as well as possible by-products.Based on the diagram and information, which statement best describes the fission reaction shown?
Answer(s): C
An animal population can increase or decrease because of food scarcity or other changes in a habitat. The graph below shows changes in a rabbit population over a 10-year period.According to the graph, during which period of time were the numbers of rabbits leaving the population and joining the population about the same?
Answer(s): E
The gear combination shown below is an example of a simple machine.The shaft on the large gear can rotate at a certain speed.How fast will the small gear rotate?
Answer(s): A
On a sunny day, a magnifying glass can concentrate sunlight to the point where the light can cause paper to burn.Which of the following materials would be the best substitute for a magnifying glass?
Answer(s): B
Some work is converted into heat whenever there is friction. For example, when you rub your hands together, they feel warm because of the friction. The same effect occurs when an automobile axle spins on ball bearings--the axle and bearings get hot.A mechanic says that the heat produced will be decreased if grease is deposited between the bearings and the axle.Which of the following statements would provide the strongest support for the mechanic's claim?
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