A ball on a string is being whirled around overhead when the string breaks. The ball will move in the direction of the centripetal force the moment the string breaks
a. True
b. False
Indicate whether the statement is true or false
False
RATIONALE: False, the ball will move in the direction of the velocity vector when the string breaks.
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Non-conservative forces can change the mechanical energy of a system
Indicate whether the statement is true or false
Which of the following descriptions shows two objects of EQUAL mass-energy?
A fuse or circuit breaker is placed in series with appliances as shown in this figure. Why not put it parallel to the appliances?
a. That would cause too much current into the appliances. b. It would work the same as putting them in series. c. The fuse or circuit breaker must be able to stop an excess current through the appliances by stopping the current through itself. d. It would have only half the current flowing through it if it were in parallel. e. It would waste electrical energy by being connected all the time that way.
Sound waves in the early universe traveled faster than half of the speed of light
Indicate whether the statement is true or false