Homework Help: Discrete Math: Applications of Dot Product

Posted by Anonymous on Saturday, February 23, 2008 at 5:29pm.

A 35-kg trunk is dragged 10m up a ramp inclined at an angle of 12 degrees to the horizontal by a force of 90 N applied at an angle of 20 degrees to the ramp. At the top of the ramp, the trunk is dragged horizontally another 15m by the same force. Find the total work done.

Here's what I have so far:

35 x 9.8 = 343 N

And I don't know how to solve this problem. Please provide a step by step solution! I know you use the formula:

W = (F (dot) d)(cosx)

Textbook Answer: 2114 J

Discrete Math: Applications of Dot Product - bobpursley, Saturday, February 23, 2008 at 5:55pm
work=90*10*cos12 + 15*90*cos32

I am assuming the force does not change direction when one gets tothe top, the problem is unclear to me on that point.
Discrete Math: Applications of Dot Product - Anonymous, Saturday, February 23, 2008 at 6:07pm
When calculated that equation to get an answer, it didn't match up with the textbook answer.

Answer this Question

Related Questions

Math: Dot Product - A box with a weight of 215 N rests on a ramp. There is a ...
Math: Applications of Dot Product - 15) In Question 14, if the ramp makes an ...
Calculus - A box is dragged with a force of 115 N up a ramp a distance of 3 m. ...
calculus - A box is dragged with a force of 115 N up a ramp a distance of 3 m. ...
Physics - a trunk is dragged across a level floor using a massless rope that ...
Dot Product 1 - A crate is dragged 3m along a smooth level floor by a 30n force ...
Calculus - Dot Product - A crate is dragged 3m along a smooth level floor by a ...
Vectors - check calculation - A box is dragged with a force of 115 N up a ramp a...
PHYSICS - Determine the normal force for a laundry basket with a mass of 5.8 kg ...
physics - a 65kg oak trunk is placed on a board, inclined at an angle of 30 with...

For Further Reading

First Name:
School Subject:
Answer: