Power

A car maintains a maxiumum speed of 20 meters per second on an uphill road at an angle of 30 degrees. The weight of the car is 10,000 newtons. Determine (a) Power needed to maintain the speed uphill in Kw. (b) Minimum time it will take to accelerate from rest to 30 meters per second on a level road. (c) Max speed it will be able to maintain if the angle is 20 degrees. Could someone check this! I submitted it once and this was the answer I got. I don't understand why the the force to go up the hill was used on the parts (b) and (c). Please help with explanations. (a) Component of weight along the hill is mg*cos60 = 0.5mg but weight = mg = 10000 Newtons --> Component of weight alo... click for more

Collision or a parked car: speed, average force and momentum

A car with a mass of 2,200 kg traveling at a velocity of 20 m/sec collides with a parked car. After the collision its velocity is +10 m/sec. If the mass of the parked car is 1,200 kg, determine: (a) Speed of the parked car after the collision. (b) Average force exerted on the parked car if the collision time (delta t) =0.1 sec. (c) Total momentum after collision

Momentum - An 82kg man drops from rest on a diving board 3.0 m above the surface of the water and comes to rest 0.55 s after reaching the water. What force does he water exert on him?

An 82kg man drops from rest on a diving board 3.0 m above the surface of the water and comes to rest 0.55 s after reaching the water. What force does he water exert on him?

Momentum

A 2500 kg car traveling to the north is slowed down uniformly from an initial velocity of 20.0 m/s by a 6250 N braking force acting opposite the car's motion. Use the impulse-momentum theorem to answer the following questions: a. What is the car's velocity after 2.50 s? b. How far does the car move during 2.50 s? c. How long does it take the car to come to a complete stop?

Power, work

A car can accelerate from rest to 25 m/sec in 12 seconds on a level road. The weight of the car is 10,000 newtons. Determine (a) power used in the acceleration in Kw. (b) Maximum speeed it will be able to maintain on an uphill road of angle 30 degrees. (c) Work done by the force during the first 5 seconds from start. (d) average force acting on the car in part (a). I know that the answer to part (a) is 26.6 Kw. Please show how to do it as well as the rest of the questions.