Relation between Ma and Vrmechanical Advantage in Lever

Q.

Which one is the example of rest as well as motion at the same time?

1. A paper weight lying on a table.

2. A bird flying high in the sky.

3. A person sitting in a stationary train.

4. A person sitting in a moving car.

Q.

When the effort arm is greater than the load arm then mechanical advantage is

1. greater than one.

2. less than one.

3. Equal to one

4. Cannot be determined

Q.

The $\mathrm{MA}$ of a machine is $5$ and its efficiency is $80\%$. It is used to lift a load of $200\mathrm{kgf}$ to a height of $20\mathrm{m}$. What is the effort required?

1. $10\mathrm{kgf}$

2. $20\mathrm{kgf}$

3. $40\mathrm{kgf}$

4. $50\mathrm{kgf}$

Q.

The ratio of Load to the effort is a reciprocal of mechanical advantage.

1. True

2. False

Q.

A simple machine has a mechanical advantage of $4$. How much load can be overcome if a force of $36N$ is applied?

Q.

Calculate the mechanical advantage of a lever in which the effort arm is 50 cm and the load arm is 2cm.

___

Q.

A system of pulleys is used to lift a load of 1000 kg wt. If the velocity ratio efficiencies and the efficiency are $20$and $90\%$ respectively, then the effort required to lift the load is ____ N

1. $5.6\times {10}^7$

2. $5.6\times {10}^{-3}$

3. $5.6\times {10}^5$

4. $560$

Q.

For a lever, $MechanicalAdvantage=\frac{loadarm}{effortarm}$.

1. True
2. False

Q.

A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf by applying an effort at distance 15 cm from the fulcrum. Find the mechanical advantage of fire tongs.

1. 75

2. 0.75

3. 25

4. 0.25

Q. the effort applied to lift a 60 N box using a simple machine is 45 N.Find the MA of the machine.​