1) The slope of the illustrated plane is increased until, at θ = 26o the penguin is just on the verge of sliding. What is the coefficient of static friction between the penguin and the plane?
2) A child on a swing is pulled back by Daddy and released from rest at a height of 0.93 m above the swing's lowest point. Find the child's speed as the swing passes through its lowest point.
3) Two hockey pucks of equal mass approach each other head-on with equal speeds of 8.4 m/s. They collide and one puck leaves the collision with a speed of 6.4 m/s. What is the speed of the other puck after the collision?