a) How high a hill can a car coast up (engine disengaged) if friction is negligible...
a) How high a hill can a car coast up (engine disengaged) if friction is negligible and its initial speed is 78.0 km/h?
m
(b)
If, in actuality, a 750 kg car with an initial speed of 78.0 km/h is observed to coast up a hill to a height 10.0 m above its starting point, how much thermal energy was generated by friction?
J
(c)
What is the average force of friction if the hill has a slope 2.5° above the horizontal?
Homework Answers
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a) How high a hill can a car coast up (engine disengaged) if
friction is negligible...
A car of mass 850 kg is initially moving at 110 km/h at the bottom of...
A car of mass 850 kg is initially moving at 110 km/h at the bottom of a large hill. Friction coefficient of 0.9 (rubber on dry asphalt) a) How high up the hill can the car coast (engine disengaged), if work done by friction is negligible? b) If, in actuality, the car is observed to coast up to a height of 22.o m above its starting point, how much thermal energy was generated by friction?
If a 791 kg car with an initial speed of 117.1 km/h is observed to coast...
If a 791 kg car with an initial speed of 117.1 km/h is observed to coast up a hill to a height 22.9 m above its starting point, how much thermal energy was generated by friction? Give your answer in kilojoules.
a hill and has an initial speed of 118 km/h at the bottom of the hill....
a hill and has an initial speed of 118 km/h at the bottom of the hill. The driver takes her foot off of the gas pedal and allows the car to coast up the hill. 33% Part (b) If, in actuality, a in J? Potential 96% 1 23 02
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.
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...
Problem # 4 The 3000 kg cable car shown in figure descends a 200 m-high hill....
Problem # 4 The 3000 kg cable car shown in figure descends a 200 m-high hill. In addition to its brakes, the cable car controls its speed by pulling a 2500 kg counterweight up the other side of the hill. The rolling friction of both the cable car and the counterweight are negligible. Counterweight 200 m 25° 35 A. Draw the free body diagrams of cable car (call it m,) and the counterweight (call it m2) mass. Draw component diagrams....
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...
You push a box of mass 16.3 kg with your car up to an icy hill...
You push a box of mass 16.3 kg with your car up to an icy hill slope of irregular shape to a height 4.5 m. The box has a speed 12.3 m/s when it starts up the hill, the same time that you brake. It then rises up to the top (with no friction) before immediately falling off a sheer cliff to the ground (with no drag). (a) What is the speed of the box at the top of the...
question 5 Module 2B: Velocity and Acceleration 4. A car travels up a hill at a...
question 5
Module 2B: Velocity and Acceleration 4. A car travels up a hill at a constant speed of 40 km/h and returns down the hill at a constant speed of 60 km/h. (a) The displacement for the round trip is Hint: Ar ? (b) The average velocity for the round trip is Hint: Ar (c) The average speed for the round trip skm/h km/h At average speed -total distacekm/h total time Assume the distance for one way is d,...
The figure below shows a 4800 kg cable car descending a high hill. A counterweight of...
The figure below shows a 4800 kg cable car descending a high hill. A counterweight of mass 4400 kg on the other side of the hill aids the breaks in controlling the cable car's speed. The rolling friction of both the cable car and the counterweight are negligible. a. How much braking force does the cable car need to descend with an acceleration of 0.15 m/s? b. What is the tension in the cable connecting the two cars in part...
a hill and has an initial speed of 118 km/h at the bottom of the hill. The driver takes her foot off of the gas pedal and allows the car to coast up the hill. 33% Part (b) If, in actuality, a in J? Potential 96% 1 23 02
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.
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...
Problem # 4 The 3000 kg cable car shown in figure descends a 200 m-high hill. In addition to its brakes, the cable car controls its speed by pulling a 2500 kg counterweight up the other side of the hill. The rolling friction of both the cable car and the counterweight are negligible. Counterweight 200 m 25° 35 A. Draw the free body diagrams of cable car (call it m,) and the counterweight (call it m2) mass. Draw component diagrams....
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...
question 5
Module 2B: Velocity and Acceleration 4. A car travels up a hill at a constant speed of 40 km/h and returns down the hill at a constant speed of 60 km/h. (a) The displacement for the round trip is Hint: Ar ? (b) The average velocity for the round trip is Hint: Ar (c) The average speed for the round trip skm/h km/h At average speed -total distacekm/h total time Assume the distance for one way is d,...
The figure below shows a 4800 kg cable car descending a high hill. A counterweight of mass 4400 kg on the other side of the hill aids the breaks in controlling the cable car's speed. The rolling friction of both the cable car and the counterweight are negligible. a. How much braking force does the cable car need to descend with an acceleration of 0.15 m/s? b. What is the tension in the cable connecting the two cars in part...
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