हिंदी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान कक्षा ११

If the speed of the stone is increased beyond the maximum permissible value, and the string breaks suddenly, which of the following correctly describes the trajectory

Advertisements
Advertisements

प्रश्न

If the speed of the stone is increased beyond the maximum permissible value, and the string breaks suddenly, which of the following correctly describes the trajectory of the stone after the string breaks?

विकल्प

  • The stone moves radially outwards.

  • The stone flies off tangentially from the instant the string breaks.

  • The stone flies off at an angle with the tangent whose magnitude depends on the speed of the particle.

MCQ
Advertisements

उत्तर

The stone flies off tangentially from the instant the string breaks.

Explanation:

The trajectory of the stone after the string breaks, i.e., the stone flies off tangentially from the instant the string breaks.The velocity is always tangential to the circle at every point during the circular motion. When the string breaks, the particle proceeds to move in the tangential direction in accordance with Newton's first law of motion.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 4: Laws of Motion - EXERCISES [पृष्ठ ७०]

APPEARS IN

एनसीईआरटी Physics Part 1 and 2 [English] Class 11
अध्याय 4 Laws of Motion
EXERCISES | Q 4.22 | पृष्ठ ७०

संबंधित प्रश्न

Give the magnitude and direction of the net force acting on a drop of rain falling down with a constant speed.


The driver of a three-wheeler moving with a speed of 36 km/h sees a child standing in the middle of the road and brings his vehicle to rest in 4.0 s just in time to save the child. What is the average retarding force on the vehicle? The mass of the three-wheeler is 400 kg and the mass of the driver is 65 kg.


State Newton’s first law of motion. Give two examples to illustrate Newton’s first law of motion.


It is sometimes heard that the inertial frame of reference is only an ideal concept and no such inertial frame actually exists. Comment.


A particle is observed from two frames S1 and S2. Frame S2 moves with respect to S1with an acceleration a. Let F1 and F2 be the pseudo forces on the particle when seen from S1 and S2, respectively. Which of the following is not possible?


If you jump barefoot on a hard surface, your legs are injured. But they are not injured if you jump on a soft surface like sand or pillow. Why?


State Newton's first law of motion.


A force of 600 dynes acts on a glass ball of mass 200 g for 12 s. If initially, the ball is at rest, find

  1. Final velocity
  2. Distance covered.

Derive the relation between newton and dyne.


What do you mean by inertia of rest?


Give two examples of the following:
Inertia of rest


Newton's first law of motion describes ______.


A car of mass m starts from rest and acquires a velocity along east `v = vhati (v > 0)` in two seconds. Assuming the car moves with uniform acceleration, the force exerted on the car is ______.


A body of mass 10 kg is acted upon by two perpendicular forces, 6 N and 8 N. The resultant acceleration of the body is ______.

  1. 1 m s–2 at an angle of tan−1 `(4/3)` w.r.t 6 N force.
  2. 0.2 m s–2 at an angle of tan−1 `(4/3)` w.r.t 6 N force.
  3. 1 m s–2 at an angle of tan−1 `(3/4)` w.r.t 8 N force.
  4. 0.2 m s–2 at an angle of tan−1 `(3/4)` w.r.t 8 N force.

In a legend, the hero-kid kicked a toy pig so that it is projected with a speed greater than that of its cry. If the weight of the toy pig is assumed to be 5 kg and the time of contact 0.01 sec., the force with which the hero-kid kicked him was ______.

(Speed of cry = 330 m/s)


A smooth sphere of radius R and mass M is placed on the smooth horizontal floor. Another smooth particle of mass m is placed on the sphere and a horizontal force F is applied on the sphere as shown. If the particle does not slip on the sphere then the value of force F is ______.


A force F is applied to the initially stationary cart. The variation of force with time is shown in the figure. The speed of the cart at t = 5 sec is ______.

 


A balloon has mass of 10 g in air. The air escapes from the balloon at a uniform rate with velocity 4.5 cm/s. If the balloon shrinks in 5 s completely. Then, the average force acting on that balloon will be (in dyne).


What is the significance of Newton’s first law?


When does an object accelerate?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×