Ask Question
2 August, 09:01

A student lifts a 90 pound (lb) ball 4 feet (ft) in 5 seconds (s). How many joules of work has the student completed?

A) 770J

B) 369J

C) 488 ft lbs

D) 488.6 J

+4
Answers (1)
  1. 2 August, 10:51
    0
    Wending your way through this question and the list of choices

    is like running through a corn-maze on a moonless night with

    your eyes closed.

    Work = (force) x (distance)

    Keeping with the units used In the question ...

    Work = (90 pounds) x (4 feet) = 360 foot-pounds.

    If you want the work expressed in joules, then you need to convert

    pounds and feet to newtons and meters.

    (90 pounds) x (4.448 newtons/pound) = 400.32 Newtons

    (4 feet) x (1 meter / 3.28084 feet) = 1.219 meters

    Work = (force) x (distance)

    = (400.32 newtons) x (1.219 meters) = 488.1 joules.
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “A student lifts a 90 pound (lb) ball 4 feet (ft) in 5 seconds (s). How many joules of work has the student completed? A) 770J B) 369J C) ...” in 📙 Physics if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers