A train, of mass 22 tonnes, moves along a straight horizontal track. A constant resistance force of 5000 N acts on the train. The power output of the engine of the train is 240 kW. Find the acceleration of the train when its speed is 20 ms.
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- When a car is moving at constant speed, the developed potential is used to overcome the frictional forces exerted by the air and the road. If the power developed by the motor is 50.0 hp, what is the total frictional force acting on the car at 24.6 m / s? 1 hp = 746 W.A car requires 72.8 hp to maintain a constant speed of 21.3 m/s on a straight, flat road. Assuming other losses are negligible, determine the magnitude of the total resistive force FR acting on the car (due to friction, air resistance, etc.). Use this conversion as needed: 1 hp = 746 W. FR = × 10³ NA child on a tricycle is moving at a speed of 1.40 m/s at the start of a 2.45 m high and 12.4 m long incline. The total mass is 45.5 kg, air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N, and the speed at the lower end of the incline is 6.80 m/s. Determine the work done (in J) by the child as the tricycle travels down the incline. J
- An elevator has a mass of 1160 kg and carries a maximum load of 612 kg. A constant frictional force of 3330 N retards its motion upward. What power must the motor deliver at a instantaneous speed of 3.38 m/s if the elevator is designed to provide an upward acceleration of 1.4 m/s2? The acceleration due to gravity is 9.8 m/s². Answer in units of W. Your response... Previous Responses X #1.55825.432 PALETTEThe electric motor of a model train accelerates the train from rest to 0.760 m/s in 20.0 ms. The total mass of the train is 545 g. Find the average power delivered to the train during its acceleration.A heavy box is pulled by a rope on a horizontal surface. (a) Assume that there is no frictional force between the box and the surface. If the tension force in the rope is 240 N and the box moves by the distance of 5.6 m in 2.9 s, what is the power output of the work done by the tension force? (b) Assume that the surface is rough and there is frictional force between the box and the surface. If the box moves at the constant speed of 0.31 m/s when the tension force is 240 N, what is the power output of the work done by the tension force?
- A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.50 x 105 N. In being launched from rest it moves through a distance of 93.6 m and has a kinetic energy of 4.37 x 107 J at lift-off. What is the work done on the jet by the catapult?A shopper pushes a grocery cart 39.25 m on level ground, against a 37.06 N frictional force. The cart has a mass of 19.79 kg. He pushes in a direction 24.67º below the horizontal. If the initial velocity was 1.78 m/s, and final speed was 16.88 m/2. What is the work done by the pushing force in unit of Joule?A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.37 x 105 N. In being launched from rest it moves through a distance of 80.6 m and has a kinetic energy of 4.56 x 107 J at lift-off. What is the work done on the jet by the catapult?
- The electric motor of a model train accelerates the train from rest to 0.760 m/s in 18.0 ms. The total mass of the train is 880 g. Find the average power delivered to the train during its acceleration.A 3.30-kN piano is lifted by three workers at a constant speed to an apartment 27.3 m above the street using a pulley system fastened to the roof of the building. Each worker is able to deliver 141 W of power, and the pulley system is 75.0% efficient (so that 25.0% of the mechanical energy is lost due to friction in the pulley). Neglecting the mass of the pulley, find the time required to lift the piano from the street to the apartment. minA 1.50 × 103-kg car starts from rest and accelerates uniformly to 16.9 m/s in 11.6 s. Assume that air resistance remains constant at 400 N during this time. (a) Find the average power developed by the engine. hp 29.7 (b) Find the instantaneous power output of the engine at t = 11.6 s, just before the car stops accelerating. 0.079670122 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. hp Need Help? Read It