show the complete solution A man exerts a 130 N force in pushing a wheelbarrow loaded with garden soil.  If he pushes it 50 m at a constant speed for 20 s, what is his power in watts? (Answer: 325 W)

Q: A man of mass 60 kg runs up a flight of 30 steps in 40 s. If each step is 20 cm high, calculate his…

A: Step 1   ∙Mass of man m=60kg   ∙Flight 30 steps in 40sec.   ∙Each step is 20cm high.

Q: In a time t=17.00 s, a 66.0-kg student runs at a steady pace up two flights of stairs whose combined…

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Q: calculate the power used lifting a 20 kg barbell to height of 0.75 m in 1.25 s.

A: given: mass of barbell m =20 kg height lifted h = 0.75 m time taken t = 1.25 sec

Q: Calculate the work done when a 20-N force pushes a cart 3.5m?

A: Write the expression for the work done to push the cart.

Q: Calculate the work done when a force of 5 N moves a book 1.2 m. (Remember that 1 N?m 5 1 J.)

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Q: how much work did the movers do (horizontally) pushing a 46 kg crate 11.9 m across a smooth floor…

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Q: what is the power of a crane that lifts it uniformly in a hurry to a height of 5 meters during 5…

A: The work done is calculated as, W=mghW=200×9.8×5W=9800 J

Q: What is the minimum work required to push a car with a mass of 1,500 kg car a distance 200 m upwards…

A: Given data: Mass of the car (m) = 1,500 kg Incline distance (d) = 200 m Incline angle θ= 20°…

Q: A crate of mass 95.6 kg is pushed along a floor with a force of 30 N for a distance of 18.5 m.…

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Q: m above

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Q: Show that 50 W of power is required to give a brick 100 J of PE in a time of 2 s.

A: Power = Work done /Time Work Done = Change in Potential Energy = 100 J

Q: Choose the BEST answer to the following: The power required to raise a 100-kg crate a vertical…

A: Given:Mass=100kgvertical distance =2mTime=4s

Q: Which requires more work - lifting a 50-kg sack a vertical distance of 2m or lifting a 25-kg sack a…

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Q: How much work does a supermarket checkout attendant do on a can of soup he pushes 0.670 m…

A: The work done is given by  Work = force x displacement

Q: force needed

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Q: average horsepower

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Q: What is the work required to raise a 200 kg barbell to a height of 1.25 m? Round off to the nearest…

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Q: A 1000-kg car travels with the horizontal at 20 m/s. Find the cruising kilowatt power required,…

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Q: An engine develops 55 kw of power. How much time does it take to lift 550 kg to a height of 40 m.

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Q: Find the power output of a 2-m dash-runner who accelerates from 0 to 4 m/s in 0.5 s if he is 60 kg.

A: Given Mass of runner m=60kg Initial velocity u=0m/s Final velocity v=4m/s Time t=0.5s

Q: A boy pushes a spring with maximum force of 75 N, compressing it 2.0 cm. How much work does the boy…

A: Given data: Applied force (F) = 75 N Compression or displacement (d) = 2.0 cm…

Q: Calculate the work done A car of weight 20000N climbs up a hill at8m/s speed. Gaining a height of…

A: Given : velocity=8m/s Weight = 20,000 N height=120 m time=100s g=10 m/s² Weight = mg Mass =…

Q: Calculate the power output in watts and horsepower of a shot-putter who takes 1.20 s to accelerate…

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Q: A worker pushes horizontally on a large crate with a force of 195 N, and the crate is moved 4.0 m.…

A: Given data: The applied force is F=195 N. The distance moved is s=4 m.

Q: What average horsepower is developed by an 80 kg man while climbing in 10 seconds a flight of stairs…

A: Given: mass of the man (m) = 80 kg time taken (t) = 10 s height raised (h) = 6 m Work done = W

Q: if you pull a wagon with a force of 200 Newton's and it takes you 20 seconds to pull it 10 meters of…

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Q: In climbing up a rope, a 62-kg athlete climbs a vertical distance of 5.0 m in 9.0 s. What minimum…

A: Given Data: The mass of an athlete is m=62 kg The vertical distance is, d=5 m The time required to…

Q: Calculate the work done on a laptop with a mass of 2 kg when it is pushed 0.5 m with a force of 5 N.

A: Given: F = 5 Ns = 0.5 m To find: Work done(W)

Q: Its takes 40 sec for a boy A to climb up a stairs while boy B takes 25 sec for the same job.…

A: Given data The time taken by boy A is given as tA = 40 sec. The time taken by boy B is given as tB…

Q: Show that about 786 W of power is expended when a 500-N barbell is lifted 2.2 m above the floor in…

A: The expression for the power is,

Q: If you pushed a cart for 3.34 meters along an incline of angle 11.51 by applying a force of 29.67…

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Q: If a force of 14.7 N is used to drag the loaded cart (from previous question) along the incline for…

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Q: A crate of mass 45 kg is pushed along a floor with a force of 20.022 N for a distance of 8.011 m.…

A: Given data:  Mass (m) = 45 kg Force (F) = 20.022 N Distance (d) = 8.011 m Required: Work done (W)

Q: In the future above, a box of mass 2.5kg is initially at rest on a rough inclined plane.  Assuming…

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Q: Calculate the potential energy of a ball having mass of 10 lbs on top os Stinson building at a…

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Q: Determine the work done in lifting a 50-pound object 4 feet.

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Q: A 100-lb boy runs up a staircase to a floor 15 ft higher in 5.45 s. His power output is.     Six…

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Q: Rita raises a 10.0 kg package to a height of 2.5 m in 2.0 s. How much power was expended on the…

A: Given Mass (m) = 10 kg  Height (h) = 2.5 m  time (t) = 2 s    Work done by Rita against gravity w =…

Q: Which requires more work—lifting a 50-kg sack a vertical distance of 2 m or lifting a 25-kg sack a…

A: Since the sack is lifted in vertical direction, work should be done opposite to the gravity.

Q: What is the dominant factor that affects the speed of an object that started from rest down a…

A: Work done on an object

Q: Find the mass of an object if it requires 700 W of power to raise it to the height of 70 m in 1.1…

A: Power = 700 W  Mass = M Height = 70 m  Time = 1.1 minutes

Q: A ball is dropped from the top of a building at 14m, and is in free fall. If the ball is 1.2kg, find…

A: Given : Height of a building (h) = 14 m Mass of a ball (m) = 1.2 kg

Q: Find the work done by gravity when a rock with mass m = 5kg falls a distance of 7m.

A: Given data: Mass (m) = 5 kg Distance (h) = 7 m Required: Work done by gravity

Q: A man pushes a lawn mower on a level lawn with a force of 203 N. If 53% of this force is directed…

A: The force acting on the lawn mover is F=53% of 203N=53100×203=107.59N

Q: A man pushes a mower on a level lawn with a force of 155 N over a horizontal distance 7.2 m in 8.0s.…

A: Given data The force is given as F = 155 N. The horizontal distance is given as d = 7.2 m. The time…

Q: A 3.0 kg ball is lifted two meters upward in two seconds, and a 6.0 kg ball is lifted one meter…

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Q: A student pushed a box 40m across a smooth horizontal floor using a constant force of 200N. If the…

A: Given values: Force applied, 200 N Displacement of the box, s=40 m Time, t=10 s

Q: 18. If 30 Joules of work is required to lift a 10-N box from the floor to a table, how high is the…

A: Given: The work done is 30 N. The applied force is 10 N.