What is the force exerted on the keys in circular motion?

  • Thread starter Thread starter skajdhfkjsdfh
  • Start date Start date
  • Tags Tags
    Motion
AI Thread Summary
To find the force exerted on the keys in circular motion, first calculate the angular velocity, which is 6.28 radians per second for 3 revolutions per second. The centripetal acceleration can be determined using the formula a = v²/r, where v is the linear velocity and r is the radius of the circular path (0.8 m). By substituting the values, the centripetal force can be calculated using F = m*a, where m is the mass of the keys (0.3 kg). Understanding the relationship between acceleration and force is crucial for solving this problem effectively.
skajdhfkjsdfh
Messages
1
Reaction score
0
Please try this problem. I am really stuck!

My keys of .3 kilograms revolve uniformly in a circle attached by a cord of 0.8 m long. The keys make 3 complete revolutions in one second. Find the force exerted on them by the cord.
 
Physics news on Phys.org
You need to tell us what you know and where you are stuck. What do you know about the acceleration of an object in circular motion? What do you know about the relation between acceleration and force?
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
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 »

Similar threads

Acceleration in uniform circular motion is uniform or non-uniform?
2
Replies
55
Views
3K
A Car on a Banked Curve Moving in Uniform Circular Motion
Replies
7
Views
3K
Is the Instantaneous Circle Proven When Centripetal Force is Removed?
Replies
6
Views
2K
Circular Motion Questions (energies, forces, angular velocities, etc.)
Replies
2
Views
1K
Relation between the velocity vector and the acceleration vector of an object
Replies
1
Views
696
Circular motion grade 12 physics
Replies
4
Views
2K
Solving a Problem: Forces Acting on P
Replies
5
Views
1K
Dynamics of Circular Motion
Replies
12
Views
517
Tension of string acting on stone moving in horizontal circular motion
Replies
19
Views
3K
Circular Motion -- Swinging keys on a string in a vertical circle
Replies
6
Views
4K

Hot Threads

Recent Insights

Back
Top