A heavy wire is suspended from a roof but no weight is attached to it lower end. Is it under stress. Explain?

Suupose a helical spring is suspended from the roof and a very small weight is attached to its lower end. What will happen to the spring when the current is passed thorugh it? Give reason to support your answer.

A mass of 2 kg is suspended with thread AB. Thread CD of the same type is attached to the other end of 2 kg mass. Lower thread is pulled gradually. harder and harder in the downward direction so as to apply force on AB. In the above given problem if the lower thread is pulled with a jerk, what happens?

A mass of 2 kg is suspended with thread AB. Thread CD of the same type is attached to the other end of 2 kg mass. Lower thread is pulled gradually. harder and harder in the downward direction so as to apply force on AB. Which of the threds will break and why?

A wire is suspended from the ceiling and strecthed under the action of a weight F suspended form its other end. Teh force exerted by the ceiling on it is equal and opposite to the weight.

A container opened from the top is made up of a metal sheet is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper ends as 8 cm and 20 cm, respectively. Find the cost of the milk which can completely fill the container, at the rate, of Rs 20 per litre. Also find the cost of metal sheet used to make the container, if it costs Rs 8 per 100 cm^2 . (Take pi = 3.14.)

A container, opened from the top and made up of a metal sheet, is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper ends as 8cm and 20 cm, respectively. Find the cost of the milk which can completely fill the container, at the rate of ₹ 20 per litre. Also find the cost of metal sheet used to make the container, if it costs ₹8 per 100 cm^2 ( Take pi = 3. 14 )

A container opened from the top and made up of a metal sheet, is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper end as 8 cm and 20 cm, respectively. Find the cost of made which can completely fill the container, at the rate of Rs 20 per litre. Also find the cost of metal shape used to make the container, if it costs Rs 8 per 16cm^(2) . (Take pi=3.14 )

Consider two cylindrical rods of identical dimensions, one of rubber and the other of steel. Both the rods are fixed rigidily at one end of the roof. A mass M is attached to each of the free ends aat the centre of the rods

A long rod made of soft iron is fixed in a vertical position. If a strong magnet A is brought into contact with its upper end, as shown in Fig., then the rod becomes so strongly magnetised that its lower end can support several small objects. If the same magnet is brought in contact with the side of the rod, quite close to the lower end (Fig,), then there is no such strong magnetisation, and the same objects cannot be supported at the lower end of the rod. Explain why magnet A acts differently in the two cases.