Numericals unit 4 class 11 physics nbf | 11th class physics | Numerical chapter 4 | NBF | Federal

Atif Ahmad Official・2 minutes read

Physics teacher Atif Ahmed solves numerical problems from the 11th class Physics book, covering topics like angular velocity, maximum speed limits, and moment of inertia, by applying formulas and calculations to real-world scenarios. The video provides detailed explanations and step-by-step solutions for each numerical problem, focusing on concepts like torque, centripetal force, and angular acceleration.

Insights

  • Atif Ahmed, a Physics teacher, demonstrates solving numerical problems from a Physics textbook chapter, providing detailed explanations and formulas for each scenario, aiding in a comprehensive understanding of angular velocity, centripetal force, moment of inertia, and angular momentum calculations.
  • The video showcases practical applications of physics concepts such as angular acceleration and artificial gravity, offering insights into real-world scenarios like calculating the maximum speed limit of a car on a circular turn or determining the angular speed for artificial gravity simulations, enhancing the viewer's grasp of physics principles in various contexts.

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Recent questions

  • How is angular velocity calculated?

    The angular velocity is determined by multiplying the number of revolutions by 2 pi radians and then dividing by time.

  • What is the formula for calculating centripetal force?

    The formula for calculating centripetal force is v = sqrt(gr), where v is the maximum speed limit, g is the acceleration due to gravity, and r is the radius of the circular turn.

  • How is the moment of inertia of a rotating stick calculated?

    The moment of inertia of a rotating stick is calculated using the formula specific to a rod rotating about its center, taking into account the mass and length of the stick.

  • How is angular momentum calculated for a rotating football?

    The angular momentum of a rotating football is calculated by multiplying the moment of inertia of a hollow sphere by the angular velocity of the football.

  • How is angular acceleration determined in different scenarios on a Merry Go Round?

    Angular acceleration on a Merry Go Round is calculated by dividing the torque by the moment of inertia, with different scenarios considered based on the presence of individuals on the Merry Go Round.

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Summary

00:00

Physics Teacher Solves Numerical Problems from Text

  • Atif Ahmed, a Physics teacher, is solving numerical problems from chapter four of the 11th class Physics National Book Foundation.
  • The video focuses on solving all the numerical problems from the chapter, with specific timestamps mentioned in the description for each numerical.
  • The first problem involves calculating the angular velocity of a flywheel in an engine that travels 3000 revolutions in one minute.
  • The angular velocity formula is discussed, with the angular displacement calculated based on the number of revolutions.
  • The solution involves multiplying the number of revolutions by 2 pi radians to find the angular displacement and then dividing by time to get the angular velocity.
  • The second problem deals with determining the maximum speed limit of a car passing through a circular turn with a radius of 14.5 meters.
  • The concept of centripetal force and frictional force acting as centripetal force is explained to calculate the maximum speed limit using the formula v = sqrt(gr).
  • The third problem involves finding the moment of inertia of a stick rotated by a PT teacher with a mass of 200g and a length of 0.8m.
  • The moment of inertia formula for a rod rotating about its center is discussed and applied to find the moment of inertia.
  • The fourth problem requires calculating the angular momentum of a football with a mass of 450g, rotating at an angular speed of 10 revolutions per second and a radius of 11cm.
  • The moment of inertia formula for a hollow sphere is used to calculate the moment of inertia, which is then multiplied by the angular velocity to find the angular momentum.

16:56

Angular Momentum Calculation on Merry Go Round

  • Value of mess: 0 p 4.5 kilograms
  • Square of aa value: 0.11 meter
  • Calculation result: 0 p 0.363 kilogram meter square
  • Moment of Inners of a Halosphere calculation
  • Angular momentum calculation with value substitution
  • Omega value: 10 revolutions per second
  • Final answer: 0.036 water seconds
  • Problem with a merry man in circus on a turntable
  • Initial and final moment of inertia comparison
  • Final angular velocity calculation: 30 radians per second
  • Boy exerts 200 Newton force on 30 kg Merry Go Round
  • Radius of Merry Go Round: 2 meters
  • Calculate angular acceleration in two scenarios
  • Scenario A: No one on the Merry Go Round
  • Scenario B: Boy weighing 20 kg sits 1.5 meters away from the center
  • Torque calculation: 400 Newton meter
  • Moment of inertia calculation for an empty Merry Go Round
  • Moment of inertia calculation with a boy sitting on the Merry Go Round

31:39

Physics Formulas and Calculations Explained

  • Formula for the disk is 1/2 * A * R^2, where A is mass and R is radius.
  • Given mass is 30 kg and radius is 2 meters, resulting in 60 kg meter square.
  • Angular acceleration formula is torque divided by moment of inertia, resulting in 6.67 radians.
  • Angular acceleration unit is radians per second square.
  • Total moment of inertia with a boy on the swing is 1005 kg meter square.
  • Angular acceleration with the boy is 3.8 radians per second.
  • Artificial gravity provides 5 meters per second square, with a 100-meter diameter.
  • Angular speed formula is square root of gravity divided by radius, resulting in 0.31 s.
  • Conversion to revolution per minute is 3.02 RPM.
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