हिंदी

Explain How, a Karate Player Can Break a Pile of Tiles with a Single Blow of His Hand.

Advertisements
Advertisements

प्रश्न

Explain how, a karate player can break a pile of tiles with a single blow of his hand.

टिप्पणी लिखिए
Advertisements

उत्तर

A karate player can break a pile of tiles with a single blow because he strikes the pile with his hand very fast. In doing so, the large momentum of his hand is reduced to zero in a very short time. This exerts a large force on the pile of tiles which is sufficient to break them apart.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 2: Force and Laws of Motion - Very Short Answers 1 [पृष्ठ ५५]

APPEARS IN

लखमीर सिंग Physics Part 1 [English] Class 9
अध्याय 2 Force and Laws of Motion
Very Short Answers 1 | Q 21 | पृष्ठ ५५

वीडियो ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्न

A hockey ball of mass 200 g travelling at 10 m s−1 is struck by a hockey stick so as to return it along its original path with a velocity at 5 m s−1. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.


An object of mass 1 kg travelling in a straight line with a velocity of 10 ms−1 collides with, and sticks to, a stationary wooden block of mass 5 kg. Then they both move off together in the same straight line. Calculate the total momentum just before the impact and just after the impact. Also, calculate the velocity of the combined object.


Name the physical quantity which is considered to be a measure of the quantity of motion of a body.


Calculate the change in momentum of a body weighing 5 kg when its velocity decreases from 20 m/s to 0.20 m/s.


A gun of mass 3 kg fires a bullet of mass 30 g. The bullet takes 0.003 s to move through the barrel of the gun and acquires a velocity of 100 m/s. Calculate:

  1. the velocity with which the gin recoils.
  2. the force exerted on gunman due to recoil of the gun

State the law of conservation of momentum.


Why would an aircraft be unable to fly on the moon ?


A boy of mass 50 kg running at 5 m/s jumps on to a 20 kg trolley travelling in the same direction at 1.5 m/s. What is their common velocity ?


Two billiard balls A and B, each of mass 50 g and moving in opposite directions with speed of 5 ms–1 each, collide and rebound with the same speed. If the collision lasts for 10–3 s, which of the following statements are true?

  1. The impulse imparted to each ball is 0.25 kg ms–1 and the force on each ball is 250 N.
  2. The impulse imparted to each ball is 0.25 kg ms–1 and the force exerted on each ball is 25 × 10–5 N.
  3. The impulse imparted to each ball is 0.5 Ns.
  4. The impulse and the force on each ball are equal in magnitude and opposite in direction.

A girl riding a bicycle along a straight road with a speed of 5 ms–1 throws a stone of mass 0.5 kg which has a speed of 15 ms–1 with respect to the ground along her direction of motion. The mass of the girl and bicycle is 50 kg. Does the speed of the bicycle change after the stone is thrown? What is the change in speed, if so?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×