# EV HSC 1st Paper 3rd Chapter Physics Note. Dynamics

EV HSC 1st Paper 3rd Chapter Physics Note. Dynamics. The physics is one of the oldest academic disciplines, perhaps the oldest through the inclusion of astronomy. In the last two millennia, physics was a part of natural philosophy, chemistry, certain branches of mathematics and biology, but during the scientific revolution in the 17th century, the natural sciences emerged as unique in its own right research programs. Physics intersects with many interdisciplinary areas of research, such as Biophysics and quantum chemistry, and physics limits are not rigidly defined. New ideas in physics often explain the fundamentals of other sciences mechanisms, to open new avenues of research in areas such as mathematics and philosophy.

## EV HSC 1st Paper 3rd Chapter Physics Note. Dynamics

Dynamics

Ques No.I

In a cricket field of average radius 66m, team ‘A’ is doing fielding and B is doing batting. A batsman hits the ball at an angle of 30° with the horizontal when a bowler bowls a ball with a velocity 100kmh-1 towards the batsman. As a result, the ball gains the equal velocity of the ball when struck bowler. A fielder at a position just 20m away from the corresponding batsman starts running towards just after the ball was batted with a velocity 10ms1.

a. What is surface energy?    1

b. How will a passenger of a bus determine the average velocity of the running bus using the kilometer stones by the sides of the road and a hand watch with him? Explain.      2

c. What is the maximum height reached the ball in the stem?             3

d. Give your opinion whether the batsman could be ‘caught out’ in the event of the stem.  4

Solution to the question no. 1

a. If a straight line considered on the surface of a liquid, then on both sides of that line the tangential force per unit length that act on the surface of the liquid is called surface tension.

b. If the total distance (d) traveled by a moving object in a particular direction is divided by the total time taken then we will get the average velocity of the object. In the highway road, there are kilometer posts seen after every one kilometer. A passenger on Board-2018 a bus can determine the average velocity of the bus simply observing the number of kilometer post and time from hand watch.

Let the passenger counts total 4 kilometers post counting from 1. The distance will be (4 – 1) = 3 km. Again let, passenger notices the times from his hand watch which is 1.5 min. So. The average velocity of the bus, V=d/t=3/1.5km min-1.=2 km min-1= 120 kmh-1

In this way, a passenger can determine the average velocity of the car while running on the road.

c. Velocity of the ball, Vo = 100 km h-1

= 27.78 ms -1, Angle = 30° So Maximum height.

= 9.84 m.

Physics is one of the oldest academic disciplines and, through its inclusion of astronomy, perhaps the oldest. Over the last two millennia, physics, chemistry, biology, and certain branches of mathematics were a part of natural philosophy, but during the scientific revolution in the 17th century, these natural sciences emerged as unique research endeavors in their own right. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. New ideas in physics often explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in academic disciplines such as mathematics and philosophy.

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