The last selection is the exactly one. This is the reason that wrenches have long handles. If the bolt is yes, really stuck or rusted top top there, a human who is careful and also knows what he"s law will periodically put one end of a 2-ft pipe over the wrench-handle, and also then press on the other finish of the pipe. Advertise on a point that"s farther away from the bolt always makes it simpler to unscrew.

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1). You apply a force of 50 N come a shovel. The shovel applies a pressure of 500 N come the weed. The mechanical benefit is 10.

TRUE

As we recognize that mechanical benefit is given as

2). You use a force 10 N to a bar which forces a tv to lift with a pressure of 20 N. The mechanical benefit is 200.

FALSE

As we understand that mechanical advantage is given as

3). That is feasible to usage a simple machine and gain no mechanical benefit No simple device can every it is provided a mechanically advantage.

FALSE

It is possible to have no mechanical advantage in those situations where used force is very same as the pressure to pull up.

4). If you want to background a 50kg thing up 5meters, girlfriend would have to supply a mechanical benefit of 10.

FALSE

It is not crucial to use MA = 10 to traction upwards a offered object

C

B

C

Explanation:

To increase the effectiveness of a machine, it is advisable the one reduces friction within the an equipment parts as much as feasible through usual procedures such as greasing and oiling. This is help to reduce the quantity of power lost due to friction thus contributing to calculation which ultimately is helpful in calculating efficiency of a machine.

Efficiency can"t be 100% since it is found by dividing work output verses input however the output is normally slightly much less than the entry energy as result of energy losses within a machine. The casualty that take place are mainly attributed to frictional losses.

Here efdiciency and also work output room given yet input is missing. Converting effectiveness into decimal we have actually 0.75 and since efficiency=output/input climate the input will certainly be provided by output/efficiency and by substitution 240/0.75=320 J

C. The occupational would continue to be the same and also mechanical advantage would increase.

You"re tho doing the same thing, yet having a much longer ramp would certainly make the work-related done much easier (mechanical benefit has increased)

The price is A & C just took it.

The mechanical benefit of a lever deserve to be calculated.

Explanation:

If the length of the initiative arm and the size of the resistance eight are offered we have the right to calculated the mechanical benefit of a lever. That is additionally defined together the ratio of output force to the entry force. Mathematically, the is given by :

Where

is the calculation force

is the input force

A bar is a simple device in which there is a Plank the is free to complimentary to rotate about a pivot. So, the correct choice is (a) "the mechanical advantage of a lever can be calculated".