
#1
Feb2405, 09:14 PM

P: 256

only two horozontal forces act on a 3kg mass. one force is 9.0 N acting due east, and the other is 8.0 N acting 62 degrees north of west. what is the magintude of the body's acceleration.
The answer in the book is 2.9 m/s^2. but how can this be? shouldn't the solution be (9 + 8cos(118))/3 = 1.74808 m/s^2 ? 



#2
Feb2405, 09:28 PM

P: 1,445

you are missing a component of the force
Sure you got that first part right but you're missing the fact that there is ANOTHER COMPONENT of force being appleid on this object. You decomposed that 8N force in 8cos 62 and 8sin62 what hapopened to the 8sin62? 



#3
Feb2405, 09:31 PM

P: 1,047

What about the northward component of the second force?
The book's answer is correct. 



#5
Feb2405, 10:09 PM

HW Helper
P: 4,125

You can deal with x and y components separately as you did, or you can use trigonometry to add the two force vectors.




#6
Feb2505, 07:39 AM

Math
Emeritus
Sci Advisor
Thanks
PF Gold
P: 38,904

"i can't be this dumb. can i? "
Don't ask questions like that! You might not like the answers! 


Register to reply 
Related Discussions  
Dumb Question  General Physics  41  
dumb question  Introductory Physics Homework  15  
God, you're dumb... and you're a WHAT?  General Discussion  60  
Do you like dumb questions?  General Engineering  20  
How dumb are we?  General Discussion  1 