Finding mass using charges and accerleration

In summary, the conversation discusses a problem involving a rod and a balloon with certain charges and a distance between them. The goal is to find the mass of the balloon using the given information. The equation Fe-Fg=ma is used, with Fg being the gravitational force and a being the acceleration of the balloon. The solution involves plugging in the known variables and solving for the mass.
  • #1
Ryan060
4
0

Homework Statement


A rod carrying a charge of 8.0uc held above a balloon carrying a charge of -.70 uc. at a height of 30cm. find the mass of the balloon

Homework Equations


fe= (q1*q2)/r^2[/B]
F=ma

The Attempt at a Solution


I do not want this problem solved for me I am very trapped at this moment. finding the electric force is easy but I cannot see how to find the mass because the fg is depended on the mass to calculate so if I do a force chart and set the sum of the forces in the y to Fe-Fg=ma with fg=-(mg) makes me stuck i need some assistance in how to actually work this problem like what correlation am I not seeing because the answer alone does not help me.
Thank you[/B]
 
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  • #2
It is not clearly stated, but I think the balloon is in equilibrium here, so you know its acceleration.
 
  • #3
mfb said:
It is not clearly stated, but I think the balloon is in equilibrium here, so you know its acceleration.
oh I forgot to add that the question lists the acceleration which was 1.5m/s/s toward the rod. what it wants me to find is the mass of the balloon using the charges listed and the distance between the two objects and somewhere in there using the acceleration I am just completely stumped on how to find the Fg in order to calculate the mass.
 
  • #4
Oh, okay.

Fine, you can still use Fe-Fg=ma. Plug in Fg and Fe you found (you don't have a numerical value for Fg yet, but that does not matter), you also know a, so the mass is the last unknown variable in the equation.
 

FAQ: Finding mass using charges and accerleration

1. How do charges and acceleration relate to finding mass?

According to Newton's Second Law, force (F) is equal to mass (m) multiplied by acceleration (a) (F=ma). Therefore, by measuring the force and acceleration of an object, we can calculate its mass using this formula.

2. What is the formula for finding mass using charges and acceleration?

The formula for finding mass using charges and acceleration is m = F/a, where m is the mass, F is the force, and a is the acceleration. This formula is derived from Newton's Second Law.

3. Can mass be found using only charges or only acceleration?

No, mass cannot be found using only charges or only acceleration. Both are necessary in order to calculate the mass of an object using the formula m = F/a.

4. How can we measure the force and acceleration of an object in order to find its mass?

Force can be measured using a spring scale or a force meter, while acceleration can be measured using a stopwatch and measuring distance traveled during a specific time period. Both measurements should be taken while the object is in motion.

5. Are there any limitations to using charges and acceleration to find mass?

Yes, there are some limitations. This method assumes that the object is accelerating at a constant rate and that the force acting on the object is due to the object's mass only. In real-life situations, there may be other forces at play that can affect the accuracy of this method.

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