Saturday

August 30, 2014

August 30, 2014

Posted by **Mitch** on Saturday, March 6, 2010 at 8:29pm.

It wants me to find the work. now i know w=Fxdr. what i want to know is why when you take the dot product of both, you get a different answer compared to when you just multiply the magnitudes.

- physics -
**drwls**, Saturday, March 6, 2010 at 8:36pmIt is called a dot product, but you typed it like a cross product, which is something else entirely.

The dot product of two vectors is the product of their magnitudes TIMES the cosine of the angle between the vectors. These vectors are not parallel in this case, so the cosine is less than 1.

In your case, the cross product is 16, and the product of the magnitudes is 19.41. The cosine of the angle between the vectors is 0.824. There is a 34.5 degree angle between them.

**Related Questions**

physics - When we studied the concept of work, we learned that work = force x ...

principles of physics - When we studied the concept of work, we learned that ...

Simple Probability Question - A small manufacturing company has rated 80% of its...

physics - A 100kg mass starts from rest at the top of an incline plane that ...

physics - A 100kg mass starts from rest at the top of an incline plane that ...

Physics - h t t p : / / i m g 2 0 5 . i m a g e s h a c k . u s / i / c a p t u ...

Algebra - According to a poll conducted in a company, 47% of the employees ...

Physics - A perforated bead of mass 37g moves on a frictionless horizontal ...

physics - A 100 kg mass starts from rest at the top of an incline plane that ...

Physics - Select which of the following statements are True or False. Assume ...