A spring balance is attached to the ceiling of a lift.

Solution: Here; h = 24 m, p = 18 m and b = ? From Pythagoras theorem; b2 = h2 – p2 Or, b2 = 242 – 182 = 576 – 324 = 252 Or, b = √252 = 6√7...

(c) : For observer in the lift, acceleration = (g – a) For observer standing outside, acceleration = g.

(a) : Both the scales read Mkg each.

(d) : Acceleration of the system a = F/(m + M) Force on block of mass m = ma = mF/(m + M).

Correct option (c) Explanation: The ceiling pulls the chain with a force equal to the sum of weights of chain and the body.  So the pulling force = (w1 + w2)

(d)  -1/4kx2. Explanation:-  The work done by the spring on both of the masses is equal to the potential energy stored in the spring. The potential energy stored in the spring =...

(d)  -1/4kx2. Explanation:-  The work done by the spring on both of the masses is equal to the potential energy stored in the spring. The potential energy stored in the spring =...

(c) will go in a circular path EXPLANATION:  At the lowest point the bob is moving horizontally with the maximum speed. When we observe the bob from the box when free falling,...

Price ceiling means deciding lower prices as comared to market price of goods. In India, there are many goods on which government has imposed price ceiling, in order to keep...

(1) The reading of the spring balance is 24N. Explanation: When lift is stationary,  W1 = mg When the lift descends with acceleration a, W2 = m(g – a) W2/W1 = (g – a)/g = (9.8 - 5)/9.8 = 4.8/9.8 W2 = W1 x (4.8/9.8) = 49 x (4.8/9.8) = 24 N