How to find Mass of an object when given Force and an angle

  • Thread starter Thread starter physics120bsu
  • Start date Start date
  • Tags Tags
    Angle Force Mass
AI Thread Summary
To find the mass of an object given a force of 7 N at 0 degrees and an opposing force of 40.3 N at 100 degrees, the correct approach involves resolving the forces into their x and y components. The vertical component of the 40.3 N force was incorrectly calculated as 40.9 N, which exceeds the original force's magnitude, indicating an error. The net force should be calculated by considering both the vertical and horizontal components to determine the resultant force acting on the mass. It is essential to correctly apply the formula Ʃ Force = Mass * Acceleration to find the mass accurately. Posting calculations and clarifying the reference for angles can help in resolving the issue.
physics120bsu
Messages
2
Reaction score
0
A mass is being held steady by a force of 7 N at 0 degrees and an opposing but equating force of 40.3 N at 100 degrees. Find the mass of the object.

Ʃ Force = Mass * Acceleration.

I found the vertical contribution of force from the force at 100 degrees to be 40.9 N but I attempted to calculated the mass from this by using this at a normal force that would oppose weight and so I divided by 9.8 and found 4.17 kgs and that was wrong. What do I do?
 

Attachments

  • physics.gif
    physics.gif
    2.1 KB · Views: 1,031
Last edited:
Physics news on Phys.org
Is that the question verbatim?
 
You can find the x and y components of each and find the resulting vector from that.
 
The question has an image so I wrote it instead. Is there a way I can put an image up on this site?
 
You should post your calculations. You have a force of 40.3 N @ 100 deg. (referenced to what?), yet you calculated a vertical component of 40.9 N. The magnitude of the component can't be greater than the magnitude of the original vector.
 
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}...
TL;DR Summary: Find Electric field due to charges between 2 parallel infinite planes using Gauss law at any point Here's the diagram. We have a uniform p (rho) density of charges between 2 infinite planes in the cartesian coordinates system. I used a cube of thickness a that spans from z=-a/2 to z=a/2 as a Gaussian surface, each side of the cube has area A. I know that the field depends only on z since there is translational invariance in x and y directions because the planes are...
Back
Top