(newton's 2nd & 3rd laws) finding mass

  • Thread starter shamma
  • Start date
  • #1
6
0
A mass is hanged by 2 cables, the first makes 30° with the ceiling while the second makes 60° with the ceiling. Find the attached mass if the first tension is 24.5 N and the second tension is 42.7 N.

my way:
T1=24.5N θ=30
T2=42.7N θ= -60
m=?
m=Fnet/a

the ans should be (m=5.017 Kg)
 

Answers and Replies

  • #2
998
15
How many forces act on the mass?
 
  • #3
6
0
3 forces
Fg and 2 tension forces
 
  • #4
998
15
Now find the vertical components of the two tensions.
 
  • #5
6
0
T1: 24.5 sin 60=21.21N
T2: 42.7 sin 30=21.35N
 
  • #6
998
15
T1: 24.5 sin 60=21.21N
T2: 42.7 sin 30=21.35N

If you draw a diagram you will notice that the above are the HORIZONTAL components.

(Incidentally, the horizontal components must be equal in magnitude)
 
  • #7
6
0
yes, your right.
 

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