Question

@Abhisar
. A car of mass 1091 kg climbs a 5.0° slope at a constant speed of 80km/h Assuming that air resistance and friction with the road may be neglected, at what rate must the engine deliver mechanical energy to the car?

238 kW
31 kW
21 kW
39 kW

Answer 1

With you so far... what's next

Answer 2

Can u tell me the value of theta here ?

Answer 3

5

Answer 4

\(\huge\checkmark\)

Answer 5

So what's the equation

Answer 6

Rate of work done = power. And power = F.v = \(\sf \frac{W}{T}\)

Answer 7

Force acting on the car will be mg.sin5° = ?

Answer 8

931.85

Answer 9

Now calculate power by multiplying it with velocity.

Answer 10

I'm getting 74548

Answer 11

Now what

Answer 12

u converted 80 km/hr into m/s first ?

Answer 13

Oh

Answer 14

Thanks got 21 as my final answer

Answer 15

\(\color{red}{\huge\bigstar}\huge\text{You're Most Welcome! }\color{red}\bigstar\)
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