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when the dimensions of the scattering particles are smaller than the wavelength of blue light

An empty 210 kg elevator accelerates upward
at 1.8 m/s2.
The acceleration of gravity is 9.8 m/s2 .
What is the tension in the cable that lifts
the elevator cab?

A pulley system with 76% efficiency is set up to lift a 18kg bag of nails. The bag is lifted to a height of 2.1m by a person pulling on the rope with a force of 58.0N.

3) What is the actual mechanical advantage of this pulley system?

4) What is the ideal mechanical advantage of this pulley system?

5) What is the distance the rope must be pulled in order to lift the bag of nails?

A pulley system with 76% efficiency is set up to lift a 18kg bag of nails. The bag is lifted to a height of 2.1m by a person pulling on the rope with a force of 58.0N.

1) What is the work done on the bag of nails by the pulley?

2) How much work is input to the system?

Two parallel and opposite forces, each 4,000 N are applied tangentially to the upper
and lower faces of a cubical metal block 25 cm on a side. Find the angle of shear and
the displacement of the upper surface relative to the lower surface. Shear modulus for
the metal is 80 GPa.

A 341kg crate needs to be lifted to a height of 2.2m using a ramp that is 7.2m long.

1) Ideally, how much work will it take to lift the crate?

2) What is the ideal mechanical advantage of this ramp?

3) If a force of 1344N is used to push the crate up the ramp, what is the work done on the crate?

A lever is used to lift a heavy load. When a 52 N force pushes the left end of the lever down 1.28 m, the load rises 0.23m.
4) If the lever is only 84% efficient, what is the work output?
5) If the lever is only 84% efficient, what would be the weight of the load it could lift with this output?

A lever is used to lift a heavy load. When a 52 N force pushes the left end of the lever down 1.28 m, the load rises 0.23m.
1) What is the ideal mechanical advantage of this lever?
2) What is the work input?
3) Calculate the weight of the load if the lever is 100% efficient

A 500 kg cannon rests on wheels that are free to roll. The cannon fires a 2 kg cannon ball horizontally with an average force of 400 N. What is the acceleration of the cannon ball? What is the recoil acceleration of the cannon

A force of 25 N accelerates a body by 5 m/s2. What is the mass of the body?

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