An elevator is accelerating upward at a rate of 3.6 m/s2. a block of mass 24 kg hangs by a low-mass rope from the ceiling, and another block of mass 90 kg hangs by a low-mass rope from the upper block. (a) what are the tensions in the upper and lower ropes?

Question

21-10-2017
Physics

contestada

An elevator is accelerating upward at a rate of 3.6 m/s2. a block of mass 24 kg hangs by a low-mass rope from the ceiling, and another block of mass 90 kg hangs by a low-mass rope from the upper block. (a) what are the tensions in the upper and lower ropes?

Respuesta :

Otras preguntas

What does a sign that warns bikers of the presence of cars indicate? a) Speed limit ahead b) Biker rest area c) Car repair shop nearby d) Pedestrian crossing

What is a common cause of deterioration in natural fiber ropes?A) Sun exposureB) Water exposureC) Chemical exposureD) High temperatures

A student is keeping a moon-phase diary for the month of September. The student checks on the moon every few days and then records the name of the moon phase. T

The radical expressions √(2) and √(12) can be combined to become one radical expression through addition or subtraction. a. True b. False

When there is an electronic cash register with all prices entered, the bartender does not need to know the drink prices.a. trueb. false

What happens if you are downshifting, and the motorcycle is going too fast for the selected gear? a) Engine stalls b) Brakes lock c) Front wheel skids d) Transm

True or False: The false position method is slightly slower than the secant method.a.trueb.false

Thomas Edison tried to make a battery to power ________ that was never used by many in his lifetime. automobiles traffic lights lamps for miners railroad s

A mobile mass typically moves into the left atrium during systole and moves to the left ventricle during diastole.a. trueb. false

Main determinant of diffusion in healthy individuals a) Temperature b) Concentration gradient c) Surface area d) Distance

Nirina7 Nirina7 · Answer 1 · 2017-10-31T19:27:18+01:00

The answer:

When the elevator accelerates upward at a rate of 3.6 m/s², the value of the acceleration becomes

A=g+3.6=13.4 m/s²
and by using the newton's law, F=mass x A, we have
T1= (24 + 90 )x 13.4= 1527.6 N, where T1 is the Tension in upper rope
and
T2= ( 90 )x 13.4= 1206N, where T2 is the Tension in lower rope

When the elevator accelerates downward at a rate of 3.6 m/s², the value of the acceleration becomes
A=9.8 - 3.6 = 6.2 m/s²

T1= (24 + 90 )x 6.2= 706.8 N, where T1 is the Tension in upper rope
and
T2= ( 90 )x 6.2= 558N, where T2 is the Tension in lower rope