In a machine the effort required to lift certain load is 150N, when efficiency is 65%. Finc the ideal effort.

Q: Ideal mechanical advantage is equal to the displacement of the effort force divided by the…

A: Every physics student is taught the principle of lever action. In this lever-action, the force is…

Q: A block and tackle system has two blocks and each block has 6 pulleys. If a downward effort of 260N…

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Q: (a) What is the average power consumption in watts of an appliance that uses 2.79 kW · h of energy…

A: Given , Energy(E) = 2.79 kW.h OR.         E= (2.79)(3600)kilojoule                E= 10044 kJ

Q: What is the average useful power output of a tractor that does 290O J of useful work in 4.8 hours?…

A: We know that, Power= Work done per unit time Where time is in seconds  , Mathematically, P = W x t…

Q: What do you understand

A: Given;  What do we understand if the machine is 85% efficient. Derive the statement ?

Q: A simple wheel and axle has a wheel diameter of 3m and an axle diameter of 25cm. What effort is…

A: The diameter of the wheel: dw=3 m The axle diameter: da=25 cm=0.25 m The mass: m=850 kg Efficiency:…

Q: A winch is driven by a 4.0 kW electric motor and is lifting a load of 400 kg to a height of 5.0 m.…

A: Formula of efficiency is as follows: η(%)=PoPin×100…

Q: The disk has an angular acceleration a =8 rad.s2 and an angular velocity w =2rad.s1 at the instant…

A: Given:- The radius r= 0.5 m  The angular velocity =2 rad/sec The angular acceleration = 8 rad/s2…

Q: A box is pulled by a force of 200N making an angle of 30° with the horizontal. How much work is done…

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Q: A student who weighs 569N climbs a stairway (vertical height of 4.3 m) in 26 s. (a) How much work is…

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Q: A leamer weighing 800N runs up 20 stairs each 20cm high in 4 seconds. How much power is exerted by…

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Q: What is the current total mechanical energy of 80-kg skydiver whose speed is 70 m/s at an altitude…

A: solution as

Q: A block of mass 1 kg is pushed up a surface inclined to horizontal at an angle of 30o by a force of…

A: Given data: Mass of block is, m=1 kg. Angle made by the horizontal is, θ=30∘. Force parallel to…

Q: Find the work required to pitch a 6.3 oz softball at 95 ft/sec. The work required to pitch a 6.3 oz…

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Q: The reservoir is filled to a depth of 5 ft, and the water is to be pumped to thesame level as the…

A: No work is done if the water is to be pumped to the same level as the top. Now,Work done(W)…

Q: A horizontal f orce of 140 Newton is needed to pull a 60.0 kilogram box across a horizontal floor at…

A: Given,Mass of the box, m = 60.0 kgHorizontla Force, F = 140 Nbox is moving with constant speed.

Q: A wire 4 m long and 0.2 mm in diameter is stretched by a force of 8 kg. Wt. If the wire elongates by…

A: Description : In this case we have to find the energy stored in the wire by having length of wire 4…

Q: Mechanical energy is conserved when a system is Select all that apply. isolated in equilibrium an…

A: Ans is Isolated

Q: A textbook claims that walking at a speed of 1.39 m/s requires a power output Pwalk=280 W. The basal…

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Q: A box is pulled by a force of 200N making an angle of 30° with the horizontal. How much work is done…

A: Given: Force applied F  = 200 N at angle θ=30° displacement d = 20 m

Q: A 60.5 kg mass is to be lifted 1.20 meters using a ramp that makes an angle of 9.75 degrees with the…

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Q: What average mechanical power (in W) must a 72.0 kg mountain climber generate to climb to the summit…

A: Given :      Mass of the climber, m = 72 kg      Height of the hill, h = 345 m      time taken, t =…

Q: What average mechanical power (in W) must a 70.5 kg mountain climber generate to climb to the summit…

A: Write the given values with suitable variables. m=70.5 kgh=305 mt=47 min=47×60 s=2820 s Here, m, h,…

Q: Water is lifted out of a well 20.0 mm deep by a motor rated at 1.10 hp. Assuming efficiency 85 % ,…

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Q: An inclined plane at an angle of 15o is used to lift a 250 kg sofa through a vertical height of 5…

A: Draw the free-body diagram of the sofa:

Q: A winch is driven by a 4.0 kW electric motor and is lifting a load of 400 kg to a height of 5.0m. If…

A: Input power, P =  4 kW = 4000 W  mass, m = 400 kg  height, h = 5 m  time, t = 8.6 s   The power is…

Q: A pulley system made up of 3 pulleys, is used to lift a load of 10kg through a height of 50cm. If…

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Q: Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity.…

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