Question

If elevator shown in figure is moving upwards with a constant acceleration 1 metre per second square, the tension in the string connected to the block A of mass 6 kg would be​

Answer 1

Answer:

T = 66 N

Explanation:

Pull force by gravity

= mg

= 6 x 10 N

= 60 N

According to Newton's second law of motion,

F = ma

T - mg = ma (As the lift is moving upwards)

T - 60 = 6 x 1

T = 6 + 60

T = 66 N

Therefore, the tension in string is 66 N.

Answer 2

Answer:

TENSION ( T ) = 66 N

★ AS ; LIFT MOVE UPWARDS ; EFFECTIVE GRAVITY INCREASE AS ( g + a ) .

★ TO BALANCE THE WEIGHT OF BLOCK ; TENSION HAS TO BALANCE IT ; SO ;

» T = M × g + m × a ( Acceleration of lift )

★ T = M ( g + a )

» T = 6 ( 10 + 1 )

» T = 6 ( 11 )

★ TENSION ( T ) = 66 NEWTON

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