College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Compare the kenetic energy of an 800.0 kg car moving at 20.0 m/s to the kenetic energy of a 1,600 kg car moving at an identical speed
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- 7. A crate of mass 10.0 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100 N parallel to the incline, which makes an angle of 20.0° T with the horizontal. The coefficient of kinetic friction is 0.400, and the crate is pulled 5.00 m. (a) How much work is done by the gravitational force on the crate? (b) Determine the increase in internal energy of the crate- incline system owing to friction. (c) How much work is done by the 100-N force on the crate? (d) What is the change in kinetic energy of the crate? (e) What is the speed of the crate after being pulled 5.00 m?arrow_forwardCatching a wave, a 77-kg surfer starts with a speed of 1.1 m/s, drops through a height of 1.50m, and ends with a speed of 8.5 m/s.How much nonconservative work was done on the surfer?arrow_forwarda weight lifter holds a 50kg weight a distance of 3m above the ground for 30 seconds.How much work is done on the weight in that time? Calculate it both ways and make sure that they match.arrow_forward
- A 5 kg object is fired straight up with an initial speed of 100 m/s. Ignore air resistance and set the initial height of the object at zero. Use g = 10m/s/s. Find the total energy of the object. Find the height of the object when its speed is 50 m/s. Find the speed of the object when its height is 80 m. Find the maximum height of the object. A child and sled have a combined mass of 50 kg. The child starts sliding from rest at the top of a 10 m high hill. On the way down, friction reduces the total energy by 3000 J. What is the child's speed at the bottom of the hill?arrow_forwardwhat is the minimum energy required to increase the speed of a 975 kg car from 20 km/h to 80 km/harrow_forwardA cable car with a mass of 5200-kg in Los Angeles (CA) is pulled a distance of 360 m along a cable up a hill inclined at 12° from the horizontal. The change in the potential energy of the car is 3.8 x10^6 3.9 x10^5 1.8 x10^7 O2.3 x10^7arrow_forward
- The driver of a 760.0 kg car decides to double the speed from 21.1 m/s to 42.2 m/s. What effect would this have on the amount of work required to stop the car, that is, on the kinetic energy of the car? KE x 105 J KE = × 105 J (select) v times as much work must be done to stop the car.arrow_forwardA 1000 kg sports car is initially traveling at 5 m/s . The driver then applies the brakes for several seconds so that 25 of net work is done on the car. Calculate the initial and final kinetic energy of the car.arrow_forwardAt NASA's Zero Gravity Research Facility in Cleveland, Ohio, experimental payloads fall freely from rest in an evacuated vertical shaft through a distance of 132 m. (a) If a particular payload has a mass of 28 kg, what is its potential energy relative to the bottom of the shaft? (b) How fast will the payload be traveling when it reaches the bottom of the shaft? Convert your answer to mph for a comparison to highway speeds.arrow_forward
- A 4 kg block is initially sliding up a 30° incline at 6 m/s. It slides 3 m along the surface before coming to rest. Gravity did ____ J of work on the block during this segment of motion. A 4 kg block is initially sliding up a 30° incline at 6 m/s. It slides 3 m along the surface before coming to rest. Kinetic friction did ____ J of work on the block during this segment of motion.arrow_forwardA 17.0 kg object was let go down an incline that is 3.50 m high. The object reaches the bottom of the incline with a speed of 1.30 m/s. Find the amount of energy dissipated by friction?arrow_forward
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