To set the world land speed record and travel faster than the speed of sound, the Thrust SSC vehicle used two jet engines that produced about a 250,000 horsepower. The principal reason why this car needed so much power to travel so fast is that
A. a car's momentum is proportional to its power, so reaching very high momentum requires very high power.
B. the pressure drag on a car increases dramatically as the car's speed increases.
C. the force of the car's momentum was enormous and the jet engines were needed to supply that force.
D. Newton's second law requires a very fast moving object to have a very large acceleration and thus a very large force.
Answer:B
To set the world land speed record and travel faster than the speed of sound, the Thrust SSC vehicle used two jet engines that produced about a 250,000 horsepower. The principal reason why this car needed so much power to travel so fast is that
A. a car's momentum is proportional to its power, so reaching very high momentum requires very high power. B. the pressure drag on a car increases dramatically as the car's speed increases. C. the force of the car's momentum was enormous and the jet engines were needed to supply that force. D. Newton's second law requires a very fast moving object to have a very large acceleration and thus a very large force.