Question

how much work do you need to do if you use a force of 3 newtons to move a table 25 meters?
0.12 n - m
85 joules
0.12 joules
75 n - m
question 2
when is work performed?
work is performed when an object reaches a maximum velocity.
work is performed when an object moves.
work is when a force is applied to an object.
work is performed when a force is applied to an object and the object moves.
question 3
what is a joule?
1 n - m
1 foot / lb
1 meter
1 meter per second squared

Explanation:

Question 1

Step1: Recall the formula for work

The formula for work \(W\) is \(W = F\times d\), where \(F\) is the force and \(d\) is the distance.

Step2: Substitute the given values

Given \(F = 3\space N\) and \(d=25\space m\), then \(W=3\times25\).

Step3: Calculate the work

\(3\times25 = 75\space N - m\) (since \(1\space J=1\space N - m\))

Work is defined as the product of force and the displacement of an object in the direction of the force. So, work is performed when a force is applied to an object and the object moves. Just moving an object (\(F = 0\) in some cases) or just applying a force (\(d = 0\)) does not constitute work. Maximum velocity is related to kinetic energy, not directly to the definition of work.

By definition, \(1\space J=1\space N\times1\space m\) (from the work formula \(W = F\times d\), when \(W = 1\space J\), \(F = 1\space N\) and \(d = 1\space m\)). A foot - lb is a unit of work in the imperial system. A meter is a unit of length and 1 meter per second squared is a unit of acceleration.

Answer:

75 N - m

Question 2