A table is pushed 15m across a room with a force of 50n. a) what is the work don?

b) if it takes 20 seconds to push the table across the room. what is the power?

The work is 750 J

The power is 37.5 watt

Explanation:

Mechanical Work and Power

Mechanical work is the amount of energy transferred by a force. It's a scalar quantity, with SI units of joules.

Being the force vector and the displacement vector, the work is calculated as:

If both the force and displacement are parallel, then we can use the equivalent scalar formula:

W=F.s

Power is the amount of energy transferred or converted per unit of time. In the SI, the unit of power is the watt, equal to one joule per second.

The power can be calculated as:

Where W is the work and t is the time.

a)

The table is pushed d=15 m across a room with a force F=50 N, thus the work is:

W=50 * 15 = 750 J

The work is 750 J

b)

The time needed to push the table is t=20 seconds, thus:

The power is 37.5 watt

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.