science

Suppose an ideal car jack has an input work 2750 J. It lifts a car 0.35 meters in 8 seconds.

a. What is the output work of the jack?
b. How much power is required to lift the car?
c. What is the efficiency of the jack?

I can't give a answer because I am very confused.

  1. 👍
  2. 👎
  3. 👁
  1. a. An ideal jack: Work output = Work input = 2750 J.

    b P = Work/t = 2750J./8s.= 344 J/s = 344 Watts.

    c. Efficiency = Po/Pi = 344/344 = 1.0 = 100 %.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A jack exerts a vertical force of 4.5 x 10^ 3 newtons to raise a car 0.25 meter. How much work is done by the jack?

  2. Physics

    A tow truck pulls a car from rest onto a level road. The tow truck exerts a horizontal force of 1500 N on the car. The frictional force on the car is 810 N. Calculate the work done by each of the following forces on the car as the

  3. Science

    The handle of a car jack is moved 75 cm and the car is lifted 2.5 cm. What is the ideal mechanical advantage of this car jack?

  4. English

    1. My father goes to work by car. 2. My father goes to work by his car. 3. My father goes to work in his car. (Which one is grammatical?) English - Jen, Tuesday, May 18, 2010 at 11:11pm I would say "my father drives his car to

  1. Physics

    Amechanic pushes a 2.50*10^3 kg car from rest to a speed of v, doing 5.00*10^3 Jof work in the process, During this time, the car moves 25.0m. Neglecting friction between car and road, find (a) v and (b) the horizontal force

  2. MATH

    a rule of thumb used by car dealers is that the trade in value of a car decreases by 20% of its value each year. suppose the initial value of your car is $23,500. write an equation expressing the trade in value of your car as a

  3. Physics

    Two cars travel at the same speed, so that they move 105 km in one hour. One car, a sleek sports car, has a motor that delivers only 35 kW of power at this speed. The other car needs its motor to produce 65 kW to move the car this

  4. physics

    A mechanic pushes a 2.50 x 10^3 kg car from the rest to a speed of v, doing 5000J of work in the process. During this time, the car moves 25.0 m. Neglecting friction between car and road, find (a) v and (b) the horizontal force

  1. physics

    A short train (an engine plus four cars) is accelerating at 1.10 . The mass of each car is 38000 , and each car has negligible frictional forces acting on it. In solving this problem, note the importance of selecting the correct

  2. physics

    A mechanic lifts the front of a car with a jack. Find the mechanical advantage if a force of 30.0 lb on the jack handle lifts the car that weighs 960 lb

  3. science

    The handle of a car jack is moved 75 cm and the car is lifted 2.5 cm. What is the ideal mechanical advantage of this car jack?

  4. Chemistry

    Jack occasionally goes to work by bicycle where he exhales once per 3.00 sec. If in Jack’s every exhale is 4.50% CO2 (by volume), he exhales a total volume of 4.6 L each time, and it takes Jack 20.0 minutes to bike to work, how

You can view more similar questions or ask a new question.