Advertisements
Advertisements
प्रश्न
A car of mass 480 kg moving at a speed of 54 km h-1 is stopped by applying brakes in 10 s . Calculate the force applied by the brakes .
Advertisements
उत्तर
Mass, m = 480 kg.
Initial velocity, u = 54 km/hr = 15 m/s.
Final velocity, v = 0.
Time, t = 10 s.
Acceleration = Change in velocity/time.
Or, a = (v - u)/t.
Or, a = (0 - 15)/10 = -1.5 ms-2.
Here, negative sign indicates retardation.
Now, Force = Mass × Acceleration
Or, F = (480) (1.5) = 720 N.
APPEARS IN
संबंधित प्रश्न
What is the C.G.S. unit of force? How is it defined?
Describe, briefly how can you calculate the value of ‘g’ with a simple pendulum.
What is the SI unit of force?
Define momentum of a body.
Which has more momentum: a fast pitched soft ball or a soft pitched soft ball?
What will be the momentum of a body at rest?
Define the constant of gravitation.
What are the SI units of constant of gravitation?
Name and state the action and reaction in the following case:
Pushing a wall.
A force acts for 0.1 s on a body of mass 3.2 kg initially at rest. The force then ceases to act and the body moves through 3 m in the next one second. Calculate the magnitude of force.
