Which of the following is a method of energy transport?
a. convection b. radiation
c. conduction d. All of the other choices are correct.
d
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A ball is rolled up an incline so that it goes part-way up and then rolls back down. Which of the graphs below could represent its acceleration vs. time from the instant it is released until it returns to where it started?
Why does the nuclear force have a short range?
a. Because the exchanged particles have nonzero mass, and thus limited time before they can complete the exchange. b. Because the low mass of the exchange particles means their exchange is effective only over short distances. c. Because the exchange particles have zero mass and thus limited time before they can complete the exchange. d. Because the exchanged particles must travel long distances to complete the exchange. e. Because it is the weakest of the four forces.
What is the reactance of a 1.0 mH inductor at 60 Hz?
What will be an ideal response?
An airplane travels 80 m/s as it makes a horizontal circular turn which has a 0.80-km radius. What is the magnitude of the resultant force on the 75-kg pilot of this airplane?
a. 0.69 kN b. 0.63 kN c. 0.66 kN d. 0.60 kN e. 0.57 kN