Suppose a car travels 108 km at a speed of 33.0 m/s and uses 1.8 gal of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (The energy content of gasoline is 140 MJ/gal.)
(a) What is the magnitude of the force exerted to keep the car moving at constant speed?
(b) If the required force is directly proportional to speed, how many gallons will be used to drive 108 km at a speed of 28.0 m/s?
Answers: 2
Physics, 22.06.2019 00:50
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Physics, 22.06.2019 14:10
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Answers: 2
Physics, 23.06.2019 00:30
Which of the following statements are evidence that gases do not always behave ideally? check all that apply.? a. co2 gas becomes dry ice (solid co2) at 1 atm and –78.5 °c. b. when two gases are mixed, they follow dalton\'s law of partial pressures. c. at 4 k and 1 atm, helium is a liquid. d. it is impossible to compress a gas enough so that it takes up no volume.
Answers: 3
Physics, 23.06.2019 00:30
Which of the following is a true statement about the acceleration ~a of the pendulum bob ~a is equal to the acceleration due to gravity. ~a is perpendicular to the bob’s trajectory. ~a is equal to the instantaneous rate of change in velocity. ~a is tangent to the bob’s trajectory.
Answers: 1
Suppose a car travels 108 km at a speed of 33.0 m/s and uses 1.8 gal of gasoline. Only 30% of the ga...
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