john marsh

If a plane is diving straight towards the ground at 500 m/s how high up must he pull out of the dive to avoid hitting the ground.

a rope can withstand 300N of force before snapping. assume that a 4 kg object is attached to the rope and is being spun in a horizontal circle with a .5 m radius. Find the velocity of the object when the rope breaks.

a man and a woman are sitting .5m away from each other. the man has a mass of 75 kg and the woman has a mass of 65 kg. what is the attractive force between them due to gravity?