Apulley system is because it decreases the

a. amount of effort needed to lift an object
b. amount of rope needed to lift an object
c. weight of the object
d. height that the object needs to be lifted

plz 20 points

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore

The diagram below shows the movement of particles. what does this piece of evidence best support? the collision theory the maxwell-boltzmann distribution the effect of pressure on reaction rates the effect of temperature on reaction rates