You are lifting a 15 kg weight. You lift the bar 0.25 m a total of 15 times. a. What is the total height the bar was lifted?

b. What is the force needed?

c. What is the work done?

Explanation:

Given parameters:

Mass of the weight  = 15kg

Height of bar lift  = 0.25m

Number of times lifted  = 15times

Unknown:

Total height the bar was lifted  = ?

Force needed for the lift = ?

Work done  = ?

Solution:

To solve this problem we need to understand that;

        Work done  = Force x distance

         Work done = mass x acceleration due gravity  x height

         Work done  = weight x height

a. Total height:

   Total height  = 0.25 x 15  = 3.75m

b. Force needed ;

   Force needed  = Weight of bar  = mass x gravity

                                                        = 15 x 9.8 = 147N

 So;

    Force used for the 15 times  = 15 x 147  = 2205N

c. Work done ;

      Work done  = weight x height  = 2205 x 3.75  = 8268.75J

divide the right side by the left side

0.024÷1.2=0.02 for example

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation: