How much power is required to lift a heavy solid concrete beam with mass 253.23 kg upward with a constant speed of 4.83 m/s using a crane? P = ____ watts CompmeiThie rest can be saved alYour anwers are saved automaticallyComptton StatosA Moving to another question will save this response.Question 6How much power is required to lift a heavy solid concrete beam with mass 253.23 kg upward with a constant speed of 4.83 m/s using a crane?wattsInput only the number. Round off to the nearest whole number.A Moving to another question will save this response.

Write the given values with the suitable variables. m=253.23 kgv=4.83 m/s Here, m is the mass and v…

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How much power is required to lift a heavy solid concrete beam with mass 253.23 kg upward with a constant speed of 4.83 m/s using a crane? P = ____ watts

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter7: Work And Kinetic Energy

Section: Chapter Questions

Problem 97AP: Grains from a hopper falls at a rate of 10 kg/s vertically onto a conveyor belt that is moving...

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Give an example of a situation in which there is a force and a displacement, but the force does no work. Explain why it does no work.
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A sled stalls from rest at the top of a snow-covered incline that makes a 22 angle with the horizontal. After sliding 75 m down the slope, its speed is 14 m/s. Use the work-energy theorem to calculate the coefficient of kinetic friction between the runners of the sled and the snowy surface.
(a) How long will it take an 850-kg car with a useful power output of 40.0 hp (1hp=746W) to reach a speed of 15.0 m/s, neglecting friction? (b) How long will this acceleration take if the car also climbs a 3.00-m-high hill in the process?
A 100 — kg man is skiing across level ground at a speed of 8.0 m/s when he comes to the small slope 1.8 m higher than ground level shown in the following figure. (a) If the skier coasts up the bill, what is his speed when he reaches the top plateau? Assume friction between the snow and skis is negligible. (b) What is his speed when he reaches the upper level if an 80 — N frictional force acts on the skis?
“ E=K+Uconstant is a special case of the work energy theorem.” Discuss this statement.
(a) What is the average useful power output of a person who does 6.00106J of useful work in 8.00 h? (b) Working at this rate, how long will it take this person to lift 2000 kg of bricks 1.50 m to a platform? (Work done to lift his body can be omitted because it is not considered useful output here.)
A man of mass 80 kg runs up a flight of stairs 20 m high in 10 s. (a) how much power is used to lift the man?(b) If the man’s body is 25 efficient, how much power does he expend?
An 8.0-g bullet has a speed of 800 m/s. (a) What is its kinetic energy? (b) What is its kinetic energy if the speed is halved?
Grains from a hopper falls at a rate of 10 kg/s vertically onto a conveyor belt that is moving horizontally at a constant speed of 2 m/s. (a) What force Is needed to keep the conveyor belt moving at the constant velocity? (b) What is the minimum power of the motor driving the conveyor belt?
A student expends 7.5 W of power in lifting a textbook 0.50 m in 1.0 s with a constant velocity. (a) How much work is done, and (b) how much does the book weigh (in newtons)? The answers to Confidence Exercises may be found at the back of the book.
Give an example of a situation in which there is a force and a displacement, but the force does no work. Explain why it does no work.