A 1750kg car starts at the bottom of a 20m tall hill traveling at 15 m/s....
A 1750kg car starts at the bottom of a 20m tall hill traveling at 15 m/s. During the trip up the hill, air resistance does -50 kJ of work on the car, and friction does an additional -120 kJ of work on the car. What is the minimum amount of work the engine must do in order for the car to reach the top of the hill?
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A 1750kg car starts at the bottom of a 20m tall hill traveling
at 15 m/s....
a 1750kg car is parked at the top of a hill with an incline of 12...
a 1750kg car is parked at the top of a hill with an incline of 12 degrees. Its brakes fail and the car starts rolling down the hill. a) how long will it take for the car to travel 200m and reach the bottom of the hill? (the coefficient of rolling friction between the tires and the road is 0.10) b) what will be its velocity at the bottom?
5. A 1000-kg car is at the top of a hill as shown, where its elevation...
5. A 1000-kg car is at the top of a hill as shown, where its elevation above the bottom of the hill is 120 m. a. What is its gravitational potential energy? 120 m b. If the cart starts from rest and rolls down the hill with negligible friction and air resistance, what will its kinetic energy be when it reaches the bottom? c. What will be its speed when it reaches the bottom? Suppose instead that there is noticeable...
A 1250 kg car drives up a hill that is 16.2 m high. During the drive,...
A 1250 kg car drives up a hill that is 16.2 m high. During the drive, two nonconservative forces do work on the car: (i) the force of friction, and (ii) the force generated by the car's engine. The work done by friction is -2.91 times 10^5 J; the work done by the engine is 6.64 times 10^5 J. Find the change in the car's kinetic energy from the bottom of the hill to the top of the hill.
A cyclist reaches the bottom of a hill with a speed of 18 m/s. Neglecting air...
A cyclist reaches the bottom of a hill with a speed of 18 m/s. Neglecting air resistance and other friction, to what maximum height can they coast up the hill without pedalling? a) 19 m b) 20 m c) 17 m d) 18 m
A 1500-kg car starts from rest and accelerates uniformly to 18.0 m/s in 12.0 s over...
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work , energy and power 120 m A boy rides a soapbox car down a hill...
work , energy and power
120 m A boy rides a soapbox car down a hill as shown. The total mass of the 60 m boy and the car is 50 kg. If 1 000) of work are done against friction, the total kinetic energy of car and rider at the bottom is
Wiring problem. In the elevator shaft of a tall building, there are 11 identical electrical wires...
Wiring problem. In the elevator shaft of a tall building, there are 11 identical electrical wires of finite resistance running from the top of the shaft to the bottom. An electrician needs to determine which wires at the bottom correspond to which wires at the top in order to repair the elevator. One battery and one ammeter are available, and the electrician can connect and disconnect any number of wires at either end. (a) If the electrician starts at the...
The 1930 kg cable car shown in the figure descends a 200-m-high hill. In addition to...
The 1930 kg cable car shown in the figure descends a 200-m-high hill. In addition to its brakes, the cable car controls its speed by pulling an 1760 kg counterweight up the other side of the hill. The rolling friction of both the cable car and the counterweight are negligible. (Figure 1) Part A How much braking force does the cable car need to descend at constant speed? Express your answer with the appropriate units. Value Units Submit Request Answer...
The driver of a 1.19 103 kg car traveling on the interstate at 35.0 m/s (nearly...
The driver of a 1.19 103 kg car traveling on the interstate at 35.0 m/s (nearly 80.0 mph) slams on his brakes to avoid hitting a second vehicle in front of him, which had come to rest because of congestion ahead. After the brakes are applied, a constant kinetic friction force of magnitude 7.96 103 N acts on the car. Ignore air resistance. (a) At what minimum distance should the brakes be applied to avoid a collision with the other...
Pictured below is a model for a train that is traveling at the steady speed of 50 m/s through standard air at sea level. The cross section of the train will be modeled as a semicircle so that the...
Pictured below is a model for a train that is traveling at the steady speed of 50 m/s through standard air at sea level. The cross section of the train will be modeled as a semicircle so that the train itself is half of a circular cylinder. Neglect the effects of any airflow beneath the train. The engine car drives the train with a propulsive thrust, and there is a coupling connecting the engine car to the passenger car. Assume...
5. A 1000-kg car is at the top of a hill as shown, where its elevation above the bottom of the hill is 120 m. a. What is its gravitational potential energy? 120 m b. If the cart starts from rest and rolls down the hill with negligible friction and air resistance, what will its kinetic energy be when it reaches the bottom? c. What will be its speed when it reaches the bottom? Suppose instead that there is noticeable...
A 1250 kg car drives up a hill that is 16.2 m high. During the drive, two nonconservative forces do work on the car: (i) the force of friction, and (ii) the force generated by the car's engine. The work done by friction is -2.91 times 10^5 J; the work done by the engine is 6.64 times 10^5 J. Find the change in the car's kinetic energy from the bottom of the hill to the top of the hill.
A cyclist reaches the bottom of a hill with a speed of 18 m/s. Neglecting air resistance and other friction, to what maximum height can they coast up the hill without pedalling? a) 19 m b) 20 m c) 17 m d) 18 m
work , energy and power
120 m A boy rides a soapbox car down a hill as shown. The total mass of the 60 m boy and the car is 50 kg. If 1 000) of work are done against friction, the total kinetic energy of car and rider at the bottom is
The 1930 kg cable car shown in the figure descends a 200-m-high hill. In addition to its brakes, the cable car controls its speed by pulling an 1760 kg counterweight up the other side of the hill. The rolling friction of both the cable car and the counterweight are negligible. (Figure 1) Part A How much braking force does the cable car need to descend at constant speed? Express your answer with the appropriate units. Value Units Submit Request Answer...
Pictured below is a model for a train that is traveling at the steady speed of 50 m/s through standard air at sea level. The cross section of the train will be modeled as a semicircle so that the train itself is half of a circular cylinder. Neglect the effects of any airflow beneath the train. The engine car drives the train with a propulsive thrust, and there is a coupling connecting the engine car to the passenger car. Assume...
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