4. The mechanical advantage of a pulley system is 10. It takes 130 N of force to lift a crate without the pulley system. a. What is the mass of the crate?
b. How much force needs to applied to the pulley system in order to lift the crate?
c. How much power is exerted by the machine if the crate lifts 750 cm in 2 seconds? Express the units two different ways.

Please help me

it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.

okay i have so many questions. but the big one here is: um wt..f is this mess? ?

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.