itsmarasilly said:Homework Statement
A student librarian picks up a 2.2 kg book from the floor to a height of 1.10 m. He carries the book 7.9 m to the stacks and places the book on a shelf that is 0.35 m above the floor. How much work does he do on the book?
Homework Equations
work=force(netdisplacement)=mg*(.35)
The Attempt at a Solution
work = ?(7.9-1.1)
work = ?(6.8) = 2.2(.35)
olgranpappy said:Only the displacement parallel to the force matters. Thus it was correct for you to use 0.35 meters in your equation. Now, tell us: what is m? what is g? what is mg?
itsmarasilly said:m = 1.10 or 7.9
g = 2200
mg = 2,200,000
no.itsmarasilly said:m = 1.10 or 7.9
olgranpappy said:no.
m is not 1.10 or 7.9.
m is the mass of the book. what is the mass of the book?
In scientific terms, work is defined as the force applied to an object multiplied by the distance over which the force is applied. Mathematically, it can be represented as W = F x d.
To calculate the amount of work done on an object, you need to know the force applied to the object and the distance over which the force is applied. Simply multiply the force by the distance to find the work done.
The SI unit for work is the Joule (J), which is equivalent to 1 Newton-meter (N*m). Other commonly used units include calorie (cal) and foot-pound (ft*lb).
Yes, work can be negative. This occurs when the force and direction of motion are in opposite directions, resulting in a negative value for work.
Work and energy are closely related concepts, with work being the transfer of energy from one object to another. The amount of work done on an object is equal to the change in energy of that object. This is represented by the equation W = ΔE, where ΔE is the change in energy.