Hello, I need some help with physics. Thank you! Question 1

Calculate the rotational inertia of a solid, uniform sphere with a mass of 18.4 kg and a radius of 0.99 m. Round your answer to one decimal place.

Question 2

Consider a see-saw with a total length of 8 m. A child with a mass of 30 kg sits on the very end of the see-saw. The child's parent, who has a mass of 78 kg, sits on the other side of the see-saw such that she balances the see-saw. How far from the pivot must the parent sit?

Question 3

You are looking for your iPhone and have decided to look under your couch. The couch is 2.6 m long and the centre of mass of the couch is 10.4 cm from the middle (towards one end). The couch has a mass of 92.4 kg. What is the minimum force required to lift one end of the couch in Newtons? Leave your answer to the nearest whole number.