Units and Measurements — Physics STD 11 Science — Question

Do A and A.U. stand for same length?

Gravitational force of attraction between two bodies of unit mass placed at unit distance apart is known as _________.

A pendulum clock gives correct time at the equator. Will it gain time or loose time as it is taken to the poles?

The gravitational potential energy of a body at a distance r from the centre of earth is U. What is the weight of the body at that point?

The oscillator of a pendulum is negatively charged and a positively charged conductor plate is placed below it. The pendulum is made to oscillate. What will be the effect on the time period of the pendulum?

Two persons pull a rope towards themselves. Each person exerts a force of 100N on the rope. Find the Young's modulus of the material of the rope if it extends in length by 1cm. Original length of the rope = 2m and the area of cross-section = 2cm².

Can the entire kinetic energy be dissipated in a completely inelastic collision?

What are the factors that may affect elasticity of a material?

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 4cm away from B going towards A.

At which point on its path a projectile has the smallest speed?