An empty coal-car (mass 20,000.kg) of a train coasts along at 10.m/s. An unfortunate 3000. kg elephant falls from a bridge and drops vertically into the car. Determine the speed of the car immediately after the elephant is added to its contents
What will be an ideal response?
8.7 m/s
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Approximately how old are the erosion channels seen on the surface of Mars?
A) 3 billion years B) 4.6 billion years C) 1 billion years D) 500 million years
A 0.50-kg toy is attached to the end of a 1.0-m very light string. The toy is whirled in a horizontal circular path on a frictionless tabletop
If the maximum tension force that the string can exert on an object without breaking is 350 N, what is the maximum speed the toy can have without breaking the string? A) 700 m/s B) 26 m/s C) 19 m/s D) 13 m/s
Which source generates the most energy over its lifetime?
A) A supernova. B) A gamma-ray burst. C) A quasar. D) The Sun. E) A camp fire.
Process of Science: If any single test of a scientific hypothesis contradicts it, the hypothesis must be revised. (Assume that you've ruled out errors in the testing process; that is, the test result really does contradict the hypothesis.)
Indicate whether the statement is true or false