How to Calculate Force Needed to Support a Man and Platform in Mid-Air?

AI Thread Summary
To calculate the force needed to support a man and a platform in mid-air, the equation F=ma is essential, where F is the force, m is the mass, and a is the acceleration. The problem requires careful consideration of the forces acting on the system, including tension and normal force. A diagram is crucial for visualizing the forces at play and understanding how to apply F=ma correctly. The solution involves determining the appropriate mass values for both the man and the platform. Overall, a systematic approach with clear diagrams will aid in solving the problem effectively.
wuffle
Messages
25
Reaction score
0

Homework Statement


Find the magnitude F of the force that the man must pull up on the rope, in order to
support himself and the platform at a xed position in mid-air (the rope is attached to a
ceiling above the man). Solve for F for a man of arbitrary mass M, and a platform of
arbitrary mass m (which includes the mass of the pulley).


Homework Equations



F=ma

The Attempt at a Solution



Obviously we should use F=ma and plug tension and normal force somewhere, I have no idea what and where to plug it in though, help!
 
Physics news on Phys.org
Drawing a diagram is important. Then one can discuss the problem.
The important point here is to be very carefull to what part of the system F=ma is applied.
 
this kind of problem always has a diagram, please draw it or attach a copy
 

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

Monkey accelerating up and down a rope
Replies
38
Views
4K
Analyzing Forces in a Platform and Pulley System
Replies
5
Views
3K
Solving Pulley and Platform Homework w/ Acceleration
Replies
35
Views
10K
Mechanics Pulley Platform Problem
Replies
13
Views
4K
What is the tension in the rope?
Replies
16
Views
7K
Tension force of block and rope
Replies
25
Views
5K
Balancing Forces on a Scale: Man with Pulleys and Tensions
Replies
7
Views
2K
Tension on a Massive Rope: How to Calculate Tension at Different Points
Replies
11
Views
3K
Find tension of a rope and kinetic force
Replies
13
Views
3K
Newton’s Law of Motions: tension forces in a pulley
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top