Oscillations — Physics STD 11 Science — Question

The mean value of period of oscillation of a simple pendulum in an experiment is 2.62s. The arithmetic mean of all the absolute errors is 0.11s. Round off the period of simple pendulum to appropriate number of significant figures with reasons.

The moon takes about 27 days to complete one orbit around the earth. The orbit is nearly a circle of radius 3.8 × 10⁸m. Calculate the mass of the earth from this data.

A tuning fork of frequency 440Hz is attached to a long string of linear mass density 0.01kg/m kept under a tension of 49N. The fork produces transverse waves of amplitude 0.50mm on the string.

1. Find the wave speed and the wavelength of the waves.
2. Find the maximum speed and acceleration of a particle of the string.
3. At what average rate is the tuning fork transmitting energy to the string?

Can Bernoulli’s equation be used to describe the flow of water through a rapid in a river? Explain.

The temperature and the dew point in an open room are 20°C and 10°C. If the room temperature drops to 15°C, what will be the new dew point?

What should be the maximum average velocity of water in a tube of diameter 2cm so that flow is laminar? The viscosity of water is 0.001Nm^-2s.

Explain why:
The earth without its atmosphere would be inhospitably cold.

Evaluate Rydberg constant by putting the values of the fundamental constants in its expression.

Sketch the magnetic field lines for a current-carrying circular loop near its centre. Replace the loop by an equivalent magnetic dipole and sketch the magnetic field lines near the centre of the dipole. Identify the difference.