Sometimes, when a theory has been refined, tested, and confirmed so often that scientists have great confidence in it, it is called__________
A) parallax
B) a hypothesis
C) a natural law
D) a model
C
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A boy kicks a football from ground level with an initial velocity of 20 m/s at an angle of 30° above the horizontal. What is the horizontal distance to the point where the football hits the ground if we neglect air resistance?
A) 20 m B) 35 m C) 18 m D) 60 m E) 30.0 m
A water pump draws about 4.4 A when connected to 240 V. What is the cost (with electrical energy at 9 cents per kWh) of running the pump for 10 h?
a. 82 cents c. 95 cents b. 8.0 cents d. 15 cents
Which of the solenoids described below has the greatest magnetic field along its axis?
A) a solenoid of length L, with N turns and a current I B) a solenoid of length L, with N/2 turns and a current I C) a solenoid of length L/2, with N/2 turns and a current I D) a solenoid of length 2L, with N turns and a current I/2 E) a solenoid of length 2L, with 2N turns and a current 2I
All things being practically equal, if the energy content in gasoline were doubled, then the distance a car should travel per liter of gasoline should
1) be no different. 2) double. 3) quadruple. If the low-energy and high-energy fuels are burned in the same time, then compared to the POWER produced by combustion of the low-energy gasoline, the power produced by the combustion of the higher-energy gasoline should 4) be no different. 5) double. 6) quadruple.