Question

questions and answers

1. Two persons are applying force on two opposite sides of a moving cart. The cart still moves with the same speed in the same direction. What do you infer about the magnitudes and direction of the forces applied?
2. Why mountaineers suffer from nose bleeding? Explain in detail.
3. A lady went to the market to buy a blanket. The shopkeeper showed her blankets made up of acrylic fibres as well as made up of wool. She preferred to buy an acrylic blanket. Can you guess why?​

Answer 1

1. Force applied is of equal magnitude in the opposite direction hence the cart moves with the same speed in the same direction.

2. Air pressure goes on decreasing as we go higher up, so at high altitudes, the atmospheric pressure becomes less than the pressure exerted by the blood inside the body. This causes some of the blood vessels burst and the nose starts bleeding.

3. Refer the attachment!

Answer 2

1. The magnitude of forces applied by both persons is same. The resulting force is 0 and there is no change in the speed or direction of the cart.
2. As the altitude increases the atmospheric pressure decrease. And the air becomes thinner and there will be very less oxygen at high altitude. So due to which the blood vessels present inside our their nose bursts and starts bleeding. This is why Mountaineers suffer from nose bleeding.
3. Acrylic is man-made fibre. Since, acrylic resembles wool so it is also known as artificial wool or synthetic wool. Acrylic is cheaper than natural wool and can be dyed in various colour. Thus acrylic is very popular and taking the place of wool today. Acrylic is used in making sweaters, blanket, and other many clothes. Thus,She preferred Acrylic fibre.
4. Hope this helps u.