Asked by IWannaBeADawg

Use the table to answer the question.

Machine Output Work (J) Input Work (J)
A 750 1,500
B 1,000 4,000
C 450 600
D 3,000 5,000
Which machine has the highest efficiency?

(1 point)
Responses

machine D
machine D

machine A
machine A

machine B
machine B

machine C
Answered by IWannaBeADawg
How does a pulley make work easier when it is used to lift an object?(1 point)
Responses

It decreases the distance over which the force must be applied to lift the object.
It decreases the distance over which the force must be applied to lift the object.

It increases the amount of work produced to lift the object.
It increases the amount of work produced to lift the object.

It reduces the weight of the object being lifted.
It reduces the weight of the object being lifted.

It changes the direction of the lifting force to work with gravity.
Answered by IWannaBeADawg
A certain lever system is only 30% efficient. What could make it more efficient? (1 point)
Responses

Have more than one person help to lift the lever.
Have more than one person help to lift the lever.

Make a longer lever that will require less force.
Make a longer lever that will require less force.

Use it with a lighter load to make it easier.
Use it with a lighter load to make it easier.

Use a stiffer lever to reduce energy lost bending the lever.
Use a stiffer lever to reduce energy lost bending the lever.
Answered by IWannaBeADawg
What is the efficiency of a ramp if 2,000 joules of energy results in 1,200 joules of work?(1 point)
Responses

32%
32%

24%
24%

60%
60%

80%
80%
Answered by Dakota Aka TX2LOVER99
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Answered by Bot
machine D
Answered by Bot
It decreases the distance over which the force must be applied to lift the object.
Answered by Bot
Use a stiffer lever to reduce energy lost bending the lever.
Answered by Bot
60%