Post a New Question

Physics ~please help me!

posted by .

1.) A car (m=1200 kg) moves form 2.0 m/s to 15.0 m/s in 100 m.
a) What is the initial kinetic energy of the car?
b) What is the final kinetic energy of the car?
c) what is the net work applied to the car?
d) what force is applied to the car?

2.) A simple pendelum is 1.5 m long and has 3.0 kg bob attached.

a) how much work was done by the chain to pull the car to the top?

b) how much potential energy does it have to the top?

c) what is the total energy of the system?

d) how much kinetic energy does it have at the bottom?

>> FORMULAS <<
KE= 1/2 v^2 (kinetic energy)
PE=mgh (potential energy)
kg.m/s^2.m
W= Fd (work equals force and distance)

~please help me!

  • Physics ~please help me! -

    a) (1/2) m v^2 = .5 * 1200 * 4 = 2,400 Joules

    b) (1/2) m v^2 = .5 * 1200 *225 = 135,000 Joules

    c) 135,000 - 2,400 = 132,600 Joules

    d) Force * distance = 132,600
    100 F = 132,600
    F = 1,326 Newtons

  • Physics car is typo? What is "top" ? , what chain? me! -

    how far do you lift the bob, up to horizontal? up to top ?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics-energy conservation

    when you apply the brakes of a car its kinetic energy or energy of motion decreases. a)to what form of energy is the kinetic energy converted?
  2. Physics

    A 1200 kg car is moving on the freeway at 65 mph. (A) find the magnitude of its momentum and its kinetic energy in SI units. (b) if a 2400 kg SUV has the same speed asthe 1200 kg car, how much momentum and kinetic energy does it have?
  3. physics

    A car is moving such that its kinetic energy is 2.20×105 J. The car accelerates and the engine does 2.10×105 J of work to accelerate the car. What is the final kinetic energy of the car?
  4. Physics

    A car is traveling at 14 m/s. How fast would the car need to go to double its kinetic energy?
  5. physics

    Let a force of 1500 Newtons act through a distance of 200 meters on a 1500 kg car which starts from rest. a. What is the work done?
  6. physics

    An experimental flywheel, used to store energy and replace an automobile engine, is a solid disk of mass 202.0 kg and radius 0.35 m. (a) What is its rotational inertia?
  7. physics

    A car has a flywheel ( a diks of R=0.2m and uniformly distributed mass M=100kg) that can convert 25% of the rotational kinetic energy into translational kinetic energy. The mass of the car is 1000kg ( including flywheel). Suppose the …
  8. physics

    I need help understanding these, please. Thanks! 1. A 2 kg body moves with constant velocity when a force of 10 N is applied. What is the coefficient of kinetic friction between the table and the body?
  9. Physics

    A car is moving such that its kinetic energy is 6.20×105 J. The car accelerates and the engine does 2.90×105 J of work to accelerate the car. What is the final kinetic energy of the car?
  10. Physics

    A car is moving such that its kinetic energy is 6.20×105 J. The car accelerates and the engine does 2.90×105 J of work to accelerate the car. What is the final kinetic energy of the car?

More Similar Questions

Post a New Question