an inclined plane pulling a drum of 50kg of drum with 25N FORCE. CALCULATE THE mechanical advantage, and what will be its velocity ratio if its 40% efficienct

A110-pound person pulls herself up 4.0 feet. this took her 2.5 seconds. how much power was developed? 0.13 hp 0.32 hp 2.0 hp 3.1 hp

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same