Apparent Weight & Lift

The weight of man in lift moving in upward direction with an acceleration 'a' is $660$ N. When the lift moves in the downward direction with the same acceleration, his weight is found to be $380$ N. The real weight of the man when the lift is at rest is

The weight of man in a stationary lift is $w_1$ and when it is moving downwards with uniform acceleration ' a ' is $w_2$. If the ratio $w_1 : w_2 = 4 : 3$, then the value of ' a ' is ( $g =$ acceleration due to gravity)

A child stands on a weighing machine inside a lift. When the lift is going down with acceleration $g/3$, the machine shows a reading 20 N. When the lift goes upwards with acceleration $g/3$, the reading would be ( $g =$ gravitational acceleration)

A balloon and its content having mass M is moving up with an acceleration ‘a’. The mass that must be released from the content so that the balloon starts moving up with an acceleration ‘3a’ will be (Take ‘g’ as acceleration due to gravity)

The mass of the lift is 200 kg, when it ascends with an acceleration of $4\text{ m/s}^{2}$ then the tension in the cable supporting the lift will be [Given: Acceleration due to gravity $g = 10\text{ m/s}^{2}$ ]

A wooden block of mass $5\text{ kg}$ rests on a soft horizontal floor. When an iron cylinder of mass $25\text{ kg}$ is placed on the top of the block, the floor yields and the block and the cylinder together go down with an acceleration of $0.1\text{ ms}^{-2}$. The action force of the system on the floor is equal to:

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring balance reads $49\text{ N}$, when the lift is stationary. If the lift moves downward with an acceleration of $5\text{ m/s}^{2}$, the reading of the spring balance will be $\left(g = 9.8\text{ m/s}^{2}\right)$

Given below are two statements:

Statement I: An elevator can go up or down with uniform speed when its weight is balanced with the tension of its cable.

Statement II: Force exerted by the floor of an elevator on the foot of a person standing on it is more than his/her weight when the elevator goes down with increasing speed.

In the light of the above statements, choose the correct answer from the options given below:

A block of mass M placed inside a box descends vertically with acceleration 'a'. The block exerts a force equal to one-fourth of its weight on the floor of the box. The value of 'a' will be

A person is standing in an elevator. In which situation, he experiences weight loss?

A monkey of mass $50\text{ kg}$ climbs on a rope which can withstand the tension (T) of $350\text{ N}$. If monkey initially climbs down with an acceleration of $4\text{ m/s}^{2}$ and then climbs up with an acceleration of $5\text{ m/s}^{2}$. Choose the correct option $\left(g = 10\text{ m/s}^{2}\right)$.

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring balance reads $49\text{ N}$, when the lift is stationary. If the lift moves downward with an acceleration of $5\text{ m/s}^{2}$, the reading of the spring balance will be $(g = 9.8\text{ m/s}^{2})$

The weight of a man in a lift moving upwards with an acceleration 'a' is 620 N. When the lift moves downwards with the same acceleration, his weight is found to be 340 N. The real weight of the man is

A person standing on a spring balance inside a stationary lift measures 60 kg. The weight of that person if the lift descends with uniform downward acceleration of 1.8 m/s2 will be ______________ N. [g = 10 m/s2]

A steel block of 10 kg rests on a horizontal floor as shown. When three iron cylinders are placed on it as shown, the block and cylinders go down with an acceleration 0.2 m/s2. The normal reaction R' by the floor if mass of the iron cylinders are equal and of 20 kg each, is ____________ N. [Take g = 10 m/s2 and $\mu$s = 0.2]

A balloon with mass m is descending down with an acceleration a (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration a?

A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s2. If g = 10 ms${}^{-2}$, the tension in the supporting cable is

The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, then its acceleration is:

A man weight 80 kg. He stands on a weighting scale in a lift which is moving upwards with a uniform acceleration of 5 m/s2. What would be the reading on the scale? (g = 10 m/s2)

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads $49\text{ N},$ when the lift is stationary. If the lift moves downward with an acceleration of $5\text{ m/s}^{2}$, the reading of the spring balance will be

A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope? (g = 10 m/s2)

A lift is moving down with acceleration $a.$ A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively

A lift of mass 1000 kg which is moving with acceleration of 1 m/s2 in upward direction, then the tension developed in string which is connected to lift is

One end of a mass-less rope, which passes over a mass-less and friction-less pulley $P$ is tied to a hook $C$ while the other end is free. Maximum tension that the rope can bear is $360\text{ N}.$ With what value of maximum safe acceleration (in $\text{ms}^{-2}$) can a man of $60\text{ kg}$ climb on the rope?

A monkey is decending from the branch of a tree with constant acceleration. If the breaking strength is 75% of the weight of the monkey, the minimum acceleration with which monkey can slide down without branch is