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  • To maintain a speed of 80 km/h by a bus of mass 500 kg on a plane rough road for 4 km distance, the work done by the engine of the bus will be _______ KJ. [The coefficient of fiction between tyre o

To maintain a speed of 80 km/h by a bus of mass 500 kg on a plane rough road for 4 km distance, the work done by the engine of the bus will be _______ KJ. [The coefficient of fiction between tyre of bus and road is 0.04. ]

Option: 1

784


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

 

For constant speed, WD by engine + WD by friction =0 [by WET ]

\begin{aligned} & W D_{\text {engine }}=-W D_{\text {friction }}=[-\mu \mathrm{mgx}] \\ & =0.04 \times 500 \times 9.8 \times 4 \times 10^3 \\ & =784 \mathrm{KJ} \end{aligned}

Posted by

Deependra Verma

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