Units and Measurements — Physics STD 11 Science — Question

A bullet of mass 20g enters into a fixed wooden block with a speed of 40ms^-1 and stops in it. Find the change in internal energy during the process.

Write two uses of v-t graph?

If an object is rotating then is there definitely any torque acting on it?

In a circuit containing a capacitor and an AC source the current is zero at the. stant the source voltage is maximum. Is it consistent with Ohm's law?

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

Answer the following :
There were two fixed points in the original Celsius scale as mentioned above which were  assigned the number 0°C and 100°C respectively. On the absolute scale, one of the fixed points is the triple-point of water, which on the Kelvin absolute scale is assigned the number 273.16 K. What is the other fixed point on this (Kelvin) scale?

An observer on the seashore sees waves reaching the shore, what type of waves does the observer see? Why?

The wheels of moving vehicles are made hollow in the middle and thick on the circumference, why?

An electric lamp and a candle produce equal illuminance at a photometer screen when they are placed at 80cm and 20cm from the screen respectively. The lamp is now covered with a thin paper which transmits 49% of the luminous flux. By what distance should the lamp be moved to balance the intensities at the screen again?

Choose the correct alternative :
(a) If the zero of potential energy is as infinity, the total energy of an orbiting satellite is negative of its kinetic/potential energy.
(b) The energy required to launch an orbiting satellite out of earth's gravitational influence is more/ less than the energy required to project a stationary object at the same height (as the satellite) out of earth's influence.