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# HW_11 - P112 Spring 2008 Homework#11 Reading 11.1-11.3...

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P112 Spring 2008 Homework #11 Reading: 11.1-11.3, 10.4-10.7 Not all concepts will be covered in class – you are responsible for all material in the reading and in the homework problems. Problems: 1. A ladder 5.0 m long rests against a frictionless vertical wall with its lower end 3.0 m from the wall. The ladder weighs 160 N. The coefficient of static friction between the foot of the ladder and the ground is 0.40. A man weighing 740 N climbs slowly up the ladder. a) What is the maximum frictional force that the ground can exert on the ladder at its lower end? b) What is the actual frictional force when the man has climbed 1.0 m along the ladder? c) how far along the ladder can the man climb before it starts to slip? 2 . Show that the total energy of a satellite in circular orbit is half its potential energy. 3. A projectile is fired straight up from the surface of the earth with an initial speed v=8km/s. Find the maximum height it reaches, neglecting air resistance.

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HW_11 - P112 Spring 2008 Homework#11 Reading 11.1-11.3...

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