Which increases the work output of a machine?
a reducing friction
b reducing input distance
cincreasing output distance
dincreasing friction


If you maintain the machine and follow all the directions and instructions concerning how to both build ( if it doesn't come built) and maintaining it, then the machine most likely would last a long time 

hope this helps
I would say C because extra friction would make the machine work more and therefore create more heat.
Bicyclist initial kinetic energy is Ek=(1/2)*m*v² where m is his mass and v is his speed and that is equal to:

Ek=(1/2)*60*2²=120 J.

When we add the increased work output, we get the total kinetic energy:

Ek(total)=Ek+W= 120 J + 1800 J= 1920 J

So Ek(total)=1920 J = (1/2)*m*V² where V is the speed after the bicyclist increased his work output. So lets solve for V:


30*V²=1920, we divide by 30,

V²=64, and take the square root of both sides,

V=8 m/s. 

So the speed of the bicyclist after the increased work output is V=8 m/s.

There are only two things you can do to increase the work output of a machine:

1).  Increase the work INput to the machine.

2).  Make the machine more efficient ... do things like lubricating it better to eliminate some internal friction.

The proposal is not accepted because of greater reduction in work output and efficiency


The following factors influence the turbine output with the suggestion below

1 - Enthalpy at the turbine exit

2 - Heat losses in the turbine

The work output of the steam turbine is



m is the mass of thee steam flowing through the turbine,

h₁ is the specific enthalpy of the steam leaving the turbine, and

Q_{loss} is the heat loss from the turbinee due to the cooking water.

Enthalpy at the turbine exit; on cooling the turbine with the cooling water, the beck pressure of the turbine is decrease.

this further decrease the specific enthalpy at the turbine exit.

the result is greater reduction in the work output and efficiency,

Heat losses in water in the turbine;

On passing the cooking water around the turbine mst of the heat is carried away by this cooliing water. As the heat losses increases in the turbine, there is a greater reduction in the work output and efficiency.

Therefore, The proposal is not accepted because of greater reduction in work output and efficiency

Option (c) is correct.

Friction is a force that opposes the motion of an object. Friction is a non conservative force. So the work done against the friction is dissipated as heat and gets wasted.That decreases the work output of a machine.We can increase the work output of a machine by using efficient fuels,using lubricants etc. we can also improve the design of the machine to increase the work output. Thus increasing friction will not increase the work output but will decrease it.

D. Increasing output distance


The work done for any machine is given by:  

Output work done of machine = W = Fd


F = output force  

d = output distance  

Output work of machine can only be increased by increasing output force or output distance. Hence, in the current situation output work of machine can be increased by increasing output distance.

8 was the correct answer, thanks

A reducing friction
A reducing friction

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