A soccer ball of diameter 22.6cm and mass 426g rolls up a hill without slipping, reaching a maximum height of 5m above the base of the hill. (a) At what rate was it rotating at the base of the hill? (b) What was the rotational kinetic energy then? (Ignore rolling friction and assume total mechanical energy is conserved). [Hint: Soccer ball is a thin walled h

Answer with Explanation:

We are given that

Diameter=d=22.6 cm

Mass,m=426 g=

1 kg=1000 g

Radius,r=

1m=100 cm

Height,h=5m

a.By law of conservation of energy

Where

b.Rotational kinetic energy=

Rotational kinetic energy=8.35 J

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.

a cold ice-tea.

pour in room temperature or cold water. cover the pitcher and refrigerate. steep white or green tea for 6 to 8 hours; steep black or oolong tea for 8 to 12 hours.jun 28, 2015