Physics

posted by .

An automobile travelling with a speed of 60km/hr, can apply brake to stop within a distance
of 20m. If the car is going twice as fast then calculate the stopping distance and stopping time?
(b) Given R1 = 5.0 ± 0.2 and R2 = 10.0 ± 0.1. calculate the total resistance in parallel with possible
% error?

  • Physics -

    a. The stopping distance is proportional to the square of the initial velocity:

    Ds = 2^2 * 20m = 80m = Stopping distance.

    The stopping time is proportional to the initial velocity:

    Vo = 60000m/h * (1h/3600s) = 16.67m/s.

    a = (Vf^2-Vo^2) / 2d,
    a = (0-(16.67)^2 / 40 = 6.94m/s.

    Ts = (vF-2Vo) / A,
    tS = (0 - 33.33) / -6.94 = 4.80s.

    b. Do you mean +-0.2% and +-0.1%?

  • Physics -

    32

  • Physics -

    1346-

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    The algebraic relation d= 0.0056s2 +0.14s models the relation between a vehicle's stopping distance d, in metres and its speed s, in km/h. a) What is the fastest you could drive and still be able to stop within 80m?
  2. PHYSICS

    A 745i BMW car can brake to a stop in a distance of 122 ft from a speed of 60.0 mi/h. To brake to a stop from a speed of 80.0 mi/h requires a stopping distance of 221 ft. What is the average braking acceleration for the following intervals?
  3. Physics

    A race car can be slowed with a constant acceleration of -11 m/s^2 a. If the car is going 55 m/s, how many meters will it travel before it stops?
  4. physics

    A 1500 kg automobile travels at a speed of 105 km/h along a straight concrete highway. Faced with an emergency situation, the driver jams on the brakes, and the car skids to a stop. (a) What will be the car's stopping distance for …
  5. Physics

    A 1500 kg automobile travels at a speed of 105 km/h along a straight concrete highway. Faced with an emergency situation, the driver jams on the brakes, and the car skids to a stop. (a) What will be the car's stopping distance for …
  6. math

    If a car is speeding down a road at 40 (mph), how long is the stopping distance compared to the stopping distance if the driver were going at the posted speed limit of 25 ?
  7. Math

    The algebraic relation d= 0.0056s2 +0.14s models the relation between a vehicle's stopping distance d, in metres and its speed s, in km/h. a) What is the fastest you could drive and still be able to stop within 80m?
  8. physics - stopping distance

    when a driver brings a car to a stop by breaki.g as hard as possible the stopping can be regarded as the sum of reaction distance and breaking distance. tje following data are given, v1 m/s contains 10,20,30. reaction distance are …
  9. Physics

    Frank is traveling the posted speed limit of 36 mi/hr in a school zone. A deer darts out between two cars. He instantly hits the brakes and the car decelerates at a rate of 5.0 m/s^2. a) how much stopping distance will he require in …
  10. Physics mechanics

    Car travelling speed 30 km/h stops after 8m distance through brakes.If same car moves at 60km/h. what is the stopping distance

More Similar Questions