Verifying Calculating Force on Elevator Support Cable

AI Thread Summary
The discussion focuses on calculating the force acting on an elevator's support cable, given its mass of 1.10e3 kg and an upward acceleration of 0.45 m/s². The formula used is F=ma, incorporating gravitational acceleration of 9.8 m/s². The calculated force is 1.12e4 N, with attention to significant figures based on the problem's original data. Participants confirm the calculation and discuss the significance of proper significant figures in the answer. The context includes a take-home test, highlighting the use of online resources for assistance.
ilkjester
Messages
35
Reaction score
0
Pretty sure I got it right just going to ask you guys to make sure.

Homework Statement


An elevator with a mass of 1.10e3 accelerates upward at 0.45 m/s squared. What is the force acting on the elevator's support cable?


Homework Equations


F=ma


The Attempt at a Solution


The 9.8 is for gravity.
f=(1.10e3)(0.45+9.8)
f=1.12e4
I think I got the right amount of sig figs to but I am not to good with those.
 
Physics news on Phys.org
Looks right to me.
 
Looks good. The general rule of thumb for the # of sig figs is to look at the original problem; whatever the LOWEST amount of sig. figs. used in the problem statement is, is what you should give your answer in.

Casey
 
Thanks guys We have a take home test this week and I am feeling pretty good about it. I don't get the whole take home part though because were aloud to use the internet and whatever but if i have any questions ill be sure to ask.
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
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...
Back
Top