1. A ball with a mass of 200 g is whirled in a circle at the end of a string 100cm long whose breaking strength is 100 N. neglecting gravity, the maximum speed of the ball is approximately.
2.A 1-kg object is moving at 10m/s. To double its kinetic energy, its speed should be increased to approximately.
3.A 430-g soccer ball lying on the ground is kicked with a force of 800N. If the kick lasts 0.01 s, the ball flies off with a speed of.
4. The speed of a 4000-kg truck whose KE is 1.8 MJ is
5.the 2.5-kg head of an ax exerts a force of 80kN as it penetrates 18mm into the truck of a tree. the speed of the ax head when it strikes the tree is.
(1) Tension force = Centripetal force = m v^2 /r
100 = 0.2 * v^2 / 1
v^2 = 100/0.2 = 500
v = sqrt 500 = 22.36 m/s is the maximum speed
(None of the options match. Please check again at your end.)
(2) Since KE ...
All the problems are solved in steps.