Answer:
6. Larry and Curley are doing work; Moe is doing no work
Step-by-step explanation:
The complete question is as follows:
Who is doing work?
Moe, Larry and Curley are hard at “work.” Moe is carrying a 17 kg box 4m horizontally across a room. Larry is lifting a 20 kg box from the floor to a shelf 3 m above the floor. Curley is climbing a ladder, to enter a hole in the ceiling 4 m above the floor.
Which of the Stooges is doing work?
1. Moe and Curley are doing work; Larry is
doing no work.
2. Larry is doing work; Moe and Curley are
doing no work.
3. Moe is doing work; Larry and Curley are
doing no work.
4. Curley is doing work; Moe and Larryy are
doing no work.
6. Larry and Curley are doing work; Moe is
doing no work.
ANSWER:
Since Moe is moving horizontally, therefore he is not doing any work. Because, moving horizontally in the gravitational field requires no work, as there is no force required to move horizontally on earth. Becuase te heigh covered while moving horizontally is zero.
Thus,
Work = mgh = mg(0) = 0
While, the Curley and Larry are both moving at a height with and without a load, respectively, thus they are doing work.
Thus. Larry and Curley are doing work; Moe is doing no work
