Physics

Question 1

Angular displacement

Answer 1

It is defined as the change in angular position.
It is a vector that is perpendicular to the plane of the motion.

theta = s/r

Question 2

units of angular displacement

Answer 2

radian (used unit)
degree
revolution

Question 3

relation between radian ,revolution and degree

Answer 3

2pai radian=360*=1 rev

Question 4

Angular velocity

Answer 4

The angular velocity is defined as the time rate of change of angular displacement.
omega=theta/t
if avg, deta must be added in the formula

Question 5

relation between linear velocity and angular velocity

Answer 5

The linear velocity of a point on the rotating body can also be called the tangential velocity because the point is moving along the tangential direction at any instant.
v=r.omega

Question 6

Angular acceleration

Answer 6

The angular acceleration is defined as the time rate of change of angular velocity.
alpha=deta omega/deta t

Question 7

relation between linear acceleration and angular acceleration

Answer 7

The linear acceleration of a point on the rotating body can also be called the tangential acceleration because the point is moving along the tangential direction at any instant.
s=r. alpha

Question 8

Is uniform circular motion accelerated?

Answer 8

Yes, Even though the speed is constant, the direction changes with time.

Question 9

How does a particle need to move to get the centripetal acceleration? why?

Answer 9

The particle must move in uniform circular motion because it has an acceleration due to the change in direction of the linear velocity. a_c=v^2/r or a_c=r . omega^2

Question 10

units of frequency in circular motion

Answer 10

cycle per second, oscillation per second, vibration per second , per second and hertz

Question 11

How to overcome the forming of electricity

Answer 11

To overcome this danger, the air in the theatre is made electrically conducting by making the atmosphere moist and humid to drain the accumulated electricity into the earth as soon as they form.
A person should touch ocassionally the water tapes,pipes or radiators to drain the acquired electricity into the earth.

Question 12

Kirchoff’s rules

Answer 12

Kirchoff’s first or junction rule is based on conservation of electric charge. Second or loop rule is based on conservation of energy.

Junction rule
The algebraic sum of the current into any junction is zero.

Loop Rule
The algebraic sum of the voltage changes around any closed path of the circuit must be zero.

Question 13

Magnetic flux

Answer 13

The total magnetic lines of force passing normally through a surface(curved or plane) is called magnetic flux.

Telsa metre square

The intensity of the magnetic field is proportional to the quantity called magnetic flux density which is a vector denoted by B.

Question 14

Magnetic flux density

Answer 14

The total magnetic lines of force passing normally through a surface of unit area is called magnetic flux density.

B= pi/ A

unit- Tesla(T) ,Gauss 1G=10^-4 T

Question 15

Magnetic flux density

Answer 15

The total magnetic lines of force passing normally through a surface of unit area is called magnetic flux density.

B= pi/ A

unit- Tesla(T) ,Gauss 1G=10^-4 T