Gravitation — Physics STD 11 Science — Question

A block of wood is floating in a lake. What is apparent weight of the floating block?

A particle is executing S.H.M. Identify the positions of the particle where:

1. K.E. of the particle is zero.
2. P.E. is zero.
3. P.E. is one fourth of the total energy.
4. P.E. and K.E. are equal.

A particle is in linear simple harmonic motion between two points, A and B, 10cm apart. Take the direction from A to B as the positive direction and give the signs of velocity, acceleration and force on the particle when it is:

At 2cm away from B going towards A.

The length of the string of a simple pendulum is measured with a metre scale to be 90.0cm. The radius of the bob plus the length of the hook is calculated to be 2.13cm using measurements with a slide callipers. What is the effective length of the pendulum? (The effective length is defined as the distance between the point of suspension and the centre of the bob.)

Which of the following methods can be used to measure the speed of light in laboratory?

1. Roemer method.
2. Fizeau method.
3. Focault method.
4. Michelson method.

What will be the time period of oscillation, if the length of a second pendulum is one third?

Which vector can be associated with a plane area? And what is its direction?

Write one application of Kirchhoff's law.

The pattern of standing waves formed on a stretched string at two instants of time are shown in The velocity of two waves superimposing to form stationary waves is 360ms^–1 and their frequencies are 256Hz

1. Calculate the time at which the second curve is plotted.
2. Mark nodes and antinodes on the curve.
3. Calculate the distance between A′ and C′.

Read each statement below carefully and state, with reasons and examples, if it is true or false:

A scalar quantity is one that

Does not vary from one point to another in space.