A string with one end fixed is being whirled from the other free end so that it vibrates with the fundamental frequency of 20 Hz. Its next harmonic has a frequency equal to
A body is projected vertically from the surface of Earth of radius R with a velocity of equal to half the escape velocity. The maximum height gained by the body is
A trolley of mass 60 kg moves on a frictionless horizontal surface and has a kinetic energy of 120 J. A mass of 20 kg is
lowered vertically into the trolley. The total kinetic energy of the system is
A force of 0.03N is required to displace a body attached to a spring through 0.2m from its equilibrium position, calculate the spring constant of the spring:
In a balanced Wheatstone bridge containing resistance R1, R2, R3 and R4 the current through the galvanometer is zero. The galvanometer current will still be zero when
When a magnet was pushed towards a solenoid, the sensitive meter connected to the solenoid deflected to the right. When the same magnet was pulled away from the solenoid with the same speed, what was the deflection onthe meter?
A transformer consists of 500 turns in primary and 200 turns in secondary. When a battery of emf 9V is connected
at the primary, the voltage obtained at the secondary is
A step up transformer changes 220 V to 4400 V at 2A current. The primary of the transformer has 100 turns.The current in primary and the number of turns in secondary are respectively
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