Question

the mass. of car is 900kg is traveling at constant speed of 30m/sec against a resistine force of 2000n, as shown in figure.calculate that power the car engine has to driver to the wheels
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Answer 1

Answer:

60 KW

Explanation:

Given :

• Mass of the car = 900 kg

• Constant speed with which the car is moving = 30 m/s

• Resistive force acting on the car = 2000 Newtons (opposite direction force)

To find :

• Power the car had to deliver to its wheels

Power = work done/time

Time will be 1 second as we have to find power per second

Work done = Force × distance × sin theta

Distance per second = 30×1 = 30 metres

Work done = 2000×30×sin 90°

Work done = 60,000 Joules

Power = 60,000/1

Power = 60,000 watts

60 kw

The minimum power to be delivered is 60 KW

Answer 2

AnswEr :

Given that mass of car is 900 kg , travelling at a constant speed of 30 m/s against a resistance force of 2000N.

We have to find power to drive the car.

Here we have,

➡ Mass (M) = 900 kg

➡ Speed (v) = 30 m/s

➡ Force (F) = 2000 N

➡ Power (P) = ?

Concept :

↗ We know, power = Work done/Time

↗ Work done = Force × Displacement

↗ Velocity = Displacement/Time

↗ Power = (Force × Displacement)/Time

∴ Power (P) = Force × Velocity

Substituting values,

→ Power = 2000 × 30

→ Power = 60000

→ Power = 60000 Watts. / 60 kilowatts.

∴ Power needed to drive car = 60000 W / 60 kW [Ans.]