Mechanics | Relativity Answers

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 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

an astronaut plays paddle ball in orbit. the ball is hit with a speed of 5.21 m/s in the positive direction and has an average negative acceleration of 4.5 m/s2. How far does the ball travel before it stops and begins to return toward the paddle? How long is it moving in the positive direction?

The weight of a rock on the moon is 0.85 N. If acceleration due to gravity on the moon is 1.7 m/s2, what will be its weight on the earth

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?

A 5 kg ball dropped from rest at a height of 10 meters and rebounds from the floor with a speed of 12 m/s. How much energy is lost as a result of the bounce?

distance 200 m,east time elapsed
300 m,west 400 sec
find for velocity
100 m,east time elapsed
400 m,west 400 sec

how do you find sliding friction