Finding Cable Tension in Elevator w/ Initial Velocity

AI Thread Summary
To find the tension in the cable of an elevator with an initial upward velocity, the relevant equations involve gravitational force and acceleration. The tension is not simply equal to mass times acceleration, as the weight of the elevator must also be considered. The provided change in height and acceleration suggests the need for potential energy calculations, but participants express confusion over the relevance of height in this context. There is uncertainty about the completeness of the problem statement, indicating that additional information may be necessary for a proper solution. The discussion highlights the need for clarity in physics problems involving multiple variables.
adhoward24
Messages
8
Reaction score
0

Homework Statement



An elevator with a small initial upward velocity being raised by a cable. The tension in the cable is constant. Find the magnitude of the tension in the cable. Be certain that the method you are using will be accurate to two significant figures.

Acceleration=10 m/s^2
Mass=60kg
Change in height = 4m

Homework Equations



PE=Mass*Acceleration*height

The Attempt at a Solution



Isn't Tension equal to MA? I try that but that's 600 N and that's not the correct answers.

Sorry i don't know the answer i just know that that's not right.
 
Last edited:
Physics news on Phys.org
what is the answer? is it on the book? I calculated it by saying T-W = 60(10).. seems okay to me, not sure though

I don't know what to do with the change in height :S
 
Yea me too, i don't know why the question provided the "h" value, and there is a value for acceleration also,,

Feels like the question is not complete,
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'Collision of a bullet on a rod-string system: query'
In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
Back
Top