Homework Help: physic

Posted by Chan on Saturday, October 24, 2009 at 2:30am.

Please help me I have no idea how to do this problem at all.
Question:A sledge loaded with bricks has a total mass of 17.8 kg and is pulled at constant speed by a rope inclined at 20.8° above the horizontal. The sledge moves a distance of 20.6 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.500.
(a) What is the tension in the rope?_ N

(b) How much work is done by the rope on the sledge?__ kJ

(c) What is the mechanical energy lost due to friction?__KJ

physic - bobpursley, Saturday, October 24, 2009 at 7:03am
you start by breaking up the tension in the rope into a vertical part (which reduces force normal and friction), and a horizontal part.
Forcenormal=mg-vertical component of tension
Friction=forcenormal*mu
so to move, the horizontal component of tension must at least equal fricion.

You can now find tension from that.
work on sled? tensioninhorizontal*distance.
frictionwork? friction*distance

Answer this Question

Related Questions

physic - Hi! I try already but, the answer is wrong could you help me to fix it ...
physic - Hi! please help A sledge loaded with bricks has a total mass of 17.8 kg...
physics - A sledge loaded with bricks has a total mass of 18.9 kg and is pulled ...
physics - A sledge loaded with bricks has a total mass of 18.9 kg and is pulled...
10th grade - A sledge loaded with bricks has a total mass of 18.0 kg nd is plled...
physics - A sled loaded with bricks has a total mass of 18.0 kg and is pulled at...
Physics- Elena please help! - A sled loaded with bricks has a total mass of 18.0...
Physics- Elena please help! - A sled loaded with bricks has a total mass of 18.0...
physics - A sled loaded with bricks has a total mass of 23.0 kg and is pulled at...
Physics URGENT!!! - A sled loaded with bricks has a total mass of 18.0 kg and is...

For Further Reading

First Name:
School Subject:
Answer: