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The substance which allows heat radiations to pass through is _______.
(A) iron
(B) water vapour
(C) wood
(D) dry air
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Explain the working of transistor as a switch.
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A particle of mass m performs the vertical motion in a circle of radius r. Its potential energy at the highest point is _______. (g is acceleration due to gravity)
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The kinetic energy per molecule of a gs at temperature T is ________.
(a) `(3/2)RT`
(b) `(3/2)K_BT`
(c) `(2/3) RT`
(d) `(3/2)("RT"/M)`
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A body cools from 80° C to 70° C in 5 minutes and to 62° C in the next 5 minutes. Calculate the temperature of the surroundings.
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Obtain expressions of energy of a particle at different positions in the vertical circular motion .
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Discuss the interlink between translational, rotational and total kinetic energies of a rigid object rolls without slipping.
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Answer in Brief:
A rigid object is rolling down an inclined plane derive the expression for the acceleration along the track and the speed after falling through a certain vertical distance.
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A pendulum consisting of a massless string of length 20 cm and a tiny bob of mass 100 g is set up as a conical pendulum. Its bob now performs 75 rpm. Calculate kinetic energy and increase in the gravitational potential energy of the bob. (Use π2 = 10)
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The ratio of emissive power of perfect blackbody at 1327°C and 527°C is ______.
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State applications of eddy currents.
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Answer in brief.
What is the natural frequency of the LC circuit? What is the reactance of this circuit at this frequency?
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Answer in brief.
What is the natural frequency of the LC circuit? What is the reactance of this circuit at this frequency?
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In a series LR circuit XL = R and power factor of the circuit is P1. When capacitor with capacitance C such that XL = XC is put in series, the power factor becomes P2. Calculate P1/P2.
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In a series LR circuit XL = R and power factor of the circuit is P1. When capacitor with capacitance C such that XL = XC is put in series, the power factor becomes P2. Calculate P1/P2.
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Derive an expression for the impedance of an LCR circuit connected to an AC power supply. Draw phasor diagram.
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Derive an expression for the impedance of an LCR circuit connected to an AC power supply. Draw phasor diagram.
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A 10 μF capacitor is charged to a 25 volt of potential. The battery is disconnected and a pure 100 m H coil is connected across the capacitor so that LC oscillations are set up. Calculate the maximum current in the coil.
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A 10 μF capacitor is charged to a 25 volt of potential. The battery is disconnected and a pure 100 m H coil is connected across the capacitor so that LC oscillations are set up. Calculate the maximum current in the coil.
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The second law of thermodynamics deals with transfer of ______.
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