PART - 2 CH - 13 Oscillations — Physics STD 11 Science — Question

A hole of area 4cm² is formed in the side of a ship 2.4m below the water level. What minimum force is required to hold on a patch covering the hole from the inside of the ship? Given that density of sea water = 1.03 × 103kg m^-3.

In the decay ⁶⁴Cu → ⁶⁴Ni + e⁺ + v, the maximum kinetic energy carried by the positron is found to be 0.650MeV.

1. What is the energy of the neutrino which was emitted together with a positron of kinetic energy 0.150MeV?
2. What is the momentum of this neutrino in kg-m/s?

Use the formula applicable to a photon.

A particle executes S.H.M. of period 8 sec. After what time of its passing through the mean position will the energy be half kinetic and half potential?

A heavy particle of mass m falls freely near the earth's surface. What is the torque acting on this particle about a point 50cm east to the line of motion? Does this torque produce any angular acceleration in the particle?

The dielectric strength of air is 3.0 × 10⁶V/m. A parallel-plate air-capacitor has area 20cm² and plate separation 0.10mm. Find the maximum rms voltage of an AC source that can be safely connected to this capacitor.

An astronaut inside a small spaceship orbiting around the earth cannot detect gravity. If the space station orbiting around the earth has a large size, can he hope to detect gravity?

The separation between a node and the next antinode in a vibrating air column is 25cm. If the speed of sound in air is 340m/s, find the frequency of vibration of the air column.

If the velocity of light is taken as the unit of velocity and year as the unit of time, what must be the unit of length? What is it called?

A spy jumps from an airplane with his parachute. The spy accelerates downward for some time when the parachute opens. The acceleration is suddenly checked and the spy slowly falls on the ground. Explain the action of parachute in checking the acceleration.