The figure below shows a force distance graph for a car being on a horizontal ground

      

The figure below shows a force distance graph for a car being on a horizontal ground
dist12632019337.png

a) Calculate the total work done
b) If the velocity just before reaching point D is 6m/s, calculate the power developed by the agent providing the force at this point.
c) An electric pump can raise water from a lower-level reservoir to the high level reservoir to the high level reservoir at the rate of 3.0 x 105 kg per hour. The vertical height of the water is raised 360m. If the rate of energy loss in form of heat is 200 kW, determine the efficiency of the pump.

  

Answers


Wilfred
(a)
Total work done= area under graph i.e between the x-axis and the line graph
w.d = 240000J. (Note that w.d is a scalar quantity and thus the –ve is consider as +ve)

(b)
dist1b2632019342.png

(c)
dist1c2632019344.png
Wilfykil answered the question on March 26, 2019 at 12:44


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