a toy/model steam engine. how it works and how to measure horse power
B i think ........................
Im fairly certain that the answer would be D, and this is because of the law of conservation of energy/momentum.
Answer:
Explanation:
Given

Motor reverse its direction when \omega =0



(b)





There are several different methods, depending on the particular situation. A few that might occasionally be useful include:
-- Read the label on the package.
-- Measure the mass and multiply by the local acceleration of gravity.
-- Measure the mass AND the local acceleration of gravity, then multiply.
-- Place the object or sample on a bathroom scale.
-- Place the object on one end of a symmetrical see-saw. Through trial and error, determine the weight required on the other end to balance the system.