Find the force!

Classical Mechanics Level 3

Take g=9.8 m/s^2

Find that force!


The answer is 94.83.

Mardokay Mosazghi by Mardokay Mosazghi , 22, USA

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4 solutions

Ahmed Hassaneen
May 23, 2014

Net Force = 0 , F- f - mgsin(theta) = 0 , F= f+mgsin(theta) F = (0.23)(15)(9.8)cos(26) + (15)(9.8)sin(26) = 94.828 .

6 Helpful 0 Interesting 0 Brilliant 0 Confused
Bernardo Sulzbach
Jun 28, 2014

Plugging the following into Wolfram|Alpha 

(cos 26°)(15 kg)(0.23)(g)+(sin 26°)(15 kg)(g)

Returns 

 94.89 N
1 Helpful 0 Interesting 0 Brilliant 0 Confused
Pankaj Kumar
May 27, 2014

F = mgsin(26) + 0.23 * mgcos(26) = 94.92

0 Helpful 0 Interesting 0 Brilliant 0 Confused

Hello,

as the speed is constant, acceleration is 0 m/s^2...

F(nett) = 0

F - ( Wx + fk) = 0

F = Wx + fk = (15)(9.81)(sin 26) + (0.23)(15)(9.81)(cos 26)

F = ~ 94.926 N

Thanks yo....

0 Helpful 0 Interesting 0 Brilliant 0 Confused

what i did that i took g =10 instead of 9.8

Shashank Rustagi - 6 years ago

Log in to reply

Even i did the same and got 96.76

Vansh Verma - 5 years, 7 months ago

by approximate value....

MOHD NAIM MOHD AMIN - 6 years ago

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