Find the magnitude of the horizantal force

  • Thread starter dg_5021
  • Start date
  • #1
80
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Hey can someone please help me with this problem. accorning to the back of the book the answer is 28N. I tried doing this first multipling 1.41*7.5 = 10.575. Then i used this formula 10.575cos(13)= but i got 9.59625.
Am I missing a step, please help?

Problem:
a shopper pushes a 7.5-kg shopping cart up a 13 incline. Find the magnitude of the horizantal force, F, needed to give the cart an acceleration of 1.41 m/s2.
 

Answers and Replies

  • #2
80
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someone please help?
 
  • #3
Tide
Science Advisor
Homework Helper
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You need to account for the fact that gravity is tending to accelerate the shopping cart downhill. :-)
 

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