Finding unknown mass with tension

  • Thread starter Thread starter x__o
  • Start date Start date
  • Tags Tags
    Mass Tension
AI Thread Summary
To find the mass of a key using tension without a scale, the setup involves analyzing the forces acting on the key suspended by strings. The equations T2 = mg and Ty = T1sinθ are used, but the user struggles to determine the tension values. It is noted that both x and y components of the tensions need to be considered for accurate calculations. The discussion emphasizes the importance of resolving the forces in both dimensions to solve for the unknown mass. Understanding the complete tension system is crucial for finding the mass accurately.
x__o
Messages
2
Reaction score
0

Homework Statement



so my teacher assigned me a to find the mass of this key without a scale using strings at whatnot.


Homework Equations





The Attempt at a Solution


i tried setting up the system like this:

____ceiling_____
\ /
\/
O
|
[Key]

and i can't seem to find it because i can't find tension.

T2=mg and Ty=T1sinθ

2T1y=T2
 
Physics news on Phys.org
What about the x components of the tensions? You need to find both the x and components for both strings. I'm assuming there is two strings there.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Thread 'Egg Drop Challenge! Need ideas for winning designs'

I was thinking using 2 purple mattress samples, and taping them together, I do want other ideas though, the main guidelines are; Must have a volume LESS than 1600 cubic centimeters, and CAN'T exceed 25 cm in ANY direction. Must be LESS than 1 kg. NO parachutes. NO glue or Tape can touch the egg. MUST be able to take egg out in less than 1 minute. Grade A large eggs will be used.
View full post »

Similar threads

Why are the forces on torque tension and not the weight of the mass?
Replies
7
Views
1K
"Tension: T1 vs T2 - What is Correct?
Replies
1
Views
2K
Calculating tensions and acceleration
Replies
10
Views
2K
Time it Takes for a Transverse Pulse to Travel a Distance "L" Up a Cable Against Gravity?
Replies
13
Views
1K
Motor lowers a mass over a pulley, find acceleration of mass
Replies
3
Views
2K
Find Acceleration & Tension in a System with Two Blocks and a Connecting Cord
Replies
6
Views
2K
Quick Question about Torque and Tension
Replies
7
Views
3K
Find the tension in the lower string and the rotation rate
Replies
9
Views
4K
Resolving forces: Mass on a string
Replies
4
Views
4K
Problem with pulleys - two fixed and one movable
Replies
22
Views
365

Hot Threads

Recent Insights

Back
Top