A size-5 soccer ball of diameter 22.6cm and mass 426g rolls up a hill without slipping, reaching a maximum height of 4.50m above the base of the hill. We can model this ball as a thin-walled hollow sphere. A) At what rate was it rotating at the base of the hill?B) How much rotational kinetic energy did it then have?

Which of the following are guidelines to follow for obtaining accurate observations

What was the first instrument to ever record an earthquake?

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?