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

Physics & Space Science

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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.

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science