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The difference in tensions in the string at lowest and highest points in the path of the particle of mass 'm' performing vertical circular motion is:....
a) 2 mg
b) 4 mg
c) 6 mg
d) 8 mg
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The S.I. unit of compressibility is __________.
Concept: undefined >> undefined
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A stone of mass 2 kg is whirled in a horizontal circle attached at the end of 1.5m long string. If the string makes an angle of 30° with vertical, compute its period. (g = 9.8 m/s2)
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A body cools from 62°C to 54°C in 10 minutes and to 48°C in the next 10 minutes. Find the temperature of the surroundings.
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The susceptibility of magnesium at 300K is 1.2 x 10-5. At what temperature will the susceptibility increase to 1.8 X 10-5?
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A planet is revolving around a star in a circular orbit of radius R with a period T. If the
gravitational force between the planet and the star is proportional to `R^(-3/2)` then
A) `T^2 prop R^(5/2)`
B) `T^2 prop R^((-7)/2)`
C) `T^2 prop R^(3/2)`
D) `T^2 prop R^4`
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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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