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Grade: Upto college level

                        

a 10kg stone is suspended with a rope of breaking strength 30 kg-wt. the min time in which the stone can be raised through a height 10m starting from rest is ( taking g =10N/kg) (here what exactly is the breaking stress of the rope)

6 years ago

Answers : (5)

Vignesh M
42 Points
							Breaking Stress Is 30 kg-wt = 300N

a = f/m = 300/10 = 30m/s

Net acceleration  = 30 = g + a

threfore a = 20m/s

s = ut + 0.5at*t

threfore 

10 = 0 + 0.5*20*t*t
10 = 10*t*t
t = 1s.

If happy = Approve me
						
6 years ago
vansh kharbanda
20 Points
							but can u also explain what is breaking stress ??
						
6 years ago
Vignesh M
42 Points
							lllfescsfs
						
6 years ago
Vignesh M
42 Points
							Stress Is Actually Force Per Unit Area.
But Here Breaking Stress means to maximum Force which the string can sustain.
If Breaking stress in 300 N
then even 300.001 N would break the string.
For calculation purposes just use the value of Breaking stress as Max. Force or Just Force.
						
6 years ago
vansh kharbanda
20 Points
							thank you.
						
6 years ago
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