1040 kg car is travelling at a velocity of 8.2 m/s. How much work must be done by the engine to speed up the car to a velocity of 15.5 m/s. Neglect friction
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A 1040 kg car is travelling at a velocity of 8.2 m/s. How much work must be done by the engine to speed up the car to a velocity of 15.5 m/s. Neglect friction.
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- i) A small 25g toy rocket is launched straight up from the ground at 144 km/h (a) What is the kinetic energy of the toy rocket? (b) Find the work done by gravity after it has risen 220 m. (i) (a). The kinetic energy of the toy rocket is = (b). The work done by gravity after it has risen 220 m is =In a time of T seconds, a motorcycle can accelerate from rest to the speed v. (a) Determine the amount of time (in terms of 7) required for it to accelerate from v to 6v if the power output remains constant. At = (b) Determine the speed of the motorcycle (in terms of v) 3T after starting. Vf=A sprinter with a mass of 55 kg is running at a speed of 3.8 m/s. In a burst of speed to win the race, she increases her speed to 5.9 m/s. Determine the work that the sprinter does to increase her speed.
- If a 1300 kg car can accelerate from 30 km/h to 65 km/h in 4.0 s , how long will it take to accelerate from 65 km/h to 95 km/h ? Assume the power stays the same, and neglect frictional losses.1. A jeep with mass of 2000 kg is going 18 m/s at the bottom of a hill that is 50.0m high. When it reaches the top, it is travelling at 10m/s. (a) what is the total work done by all forces (the jeep engine, the mud, gravity, etc) as it ascends the hill? (b) What is the minimum work required by engine of the jeep if only the engine and gravity are doing work (if there is na friction, forces from mud, etc)?A 500 kg dragster reaches a speed of 90 m/s on level ground, starting from rest. Its efficiency is only 8.20% in producing kinetic energy, because of friction and its design for high power without regard to efficiency. (a) How many gallons of fuel does it use during this acceleration, given there are 1.30 x 10 3 of energy per gallon? gal (b) How much waste beat (in 3) is produced? 3 (c) Once it is brought back to rest (assuming the engine shuts off at the end of the race), how much waste heat (in 3) has been produced?
- Assume that before the accident happened, the car was going at a constant velocity of 60Km/h on a level highway for a distance of 10.0km. The car accelerated briefly to 70.0Km/h to pass another car and then returns to 60.0Km/h as it descends the other side of the hill, even though the driver has taken her foot off the accelerator. Describe the energy transformations taking place when the engine was not doing the work.A 3500 lb SUV is traveling at 30 mph up a 6% slope when the engine quits. Use work and energy to determine the distance traveled until the vehicle comes to rest (at which point the parking brake is applied). Assume drag forces are negligible.