A certain amount of work W is required to accelerate a car from rest to a speed v. If instead an amount of work equal to 2Wis done on the car, what is the carâ€™s speed?
Answer to relevant QuestionsCar B is traveling twice as fast as car A, but car A has four times the mass of car B. Which car has the greater kinetic energy? (a) Does efficiency describe how fast work is done? Explain. (b) Does a more powerful machine always per-form more work than a less powerful one? Explain. If a person does 50 J of work in moving a 30-kg box over a 10-m distance on a horizontal surface, what is the minimum force required? To measure the spring constant of a certain spring, a student applies a 4.0-N force, and the spring stretches by 5.0 cm. What is the spring constant? A particular spring has a force constant of 2.5 x 103 N/m. (a) How much work is done in stretching the relaxed spring by 6.0 cm? (b) How much more work is done in stretching the spring an additional 2.0 cm?
Post your question