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Consider an engine that absorbs 130 cal of heat from a hot reservoir and delivers 30 cal heat to a cold reservoir in each cycle. The engine also consumes \(2 \mathrm{~J}\) energy in each cycle to overcome friction. If the engine works at 90 cycles per minute, what will be the maximum power delivered to the load? [Assume the thermal equivalent of heat is \(4.2 \mathrm{~J} / \mathrm{cal}\) ]
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Dec 11, 2021
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Kinematics
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kritika
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A pair of parallel metal plates are kept with a separation ' \(\mathrm{d}\) '. One plate is at a potential \(+\mathrm{V}\) and the other is at ground potential. A narrow beam of electrons enters the space between the plates with a velocity \(v_{0}\) and in a direction parallel to the plates. What will be the angle of the beam with the plates after it travels an axial distance L?
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Dec 11, 2021
in
Magnetic effects of
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kritika
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A conducting circular loop of resistance \(20 \Omega\) and cross-sectional area \(20 \times 10^{-2} \mathrm{~m}^{2}\) is placed perpendicular to a spatially uniform magnetic field \(B\), which varies with time \(t\) as \(B=2 \sin (50 \pi t) T\). Find the net charge flowing through the loop in \(20 \mathrm{~ms}\) starting from \(\mathrm{t}=0\)
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Dec 11, 2021
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Magnetic effects of
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kritika
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A thin convex lens is placed just above an empty vessel of depth \(80 \mathrm{~cm}\). The image of a coin kept at the bottom of the vessel is thus formed \(20 \mathrm{~cm}\) above the lens. If now water is poured in the vessel up to a height of \(64 \mathrm{~cm}\), what will be the approximate new position of the image. Assume that refractive index of water is \(4 / 3 .\)
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Dec 11, 2021
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Kinematics
by
kritika
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90.1k
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1
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An object is placed \(60 \mathrm{~cm}\) in front of a convex mirror of focal length \(30 \mathrm{~cm}\). A plane mirror is now placed facing the object in between the object and the convex mirror such that it covers lower half of the convex mirror. What should be the distance of the plane mirror from the object so that there will be no parallax between the images formed by the two mirrors?
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Dec 11, 2021
in
Kinematics
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kritika
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90.1k
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1
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Consider a conducting wire of length \(L\) bent in the form of a circle of radius \(R\) and another conductor of length 'a' (a \(<<\mathrm{R})\) is bent in the form of a square. The two loops are then placed in same plane such that the square loop is exactly at the centre of the circular loop. What will be the mutual inductance between the two loops?
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Dec 11, 2021
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Kinematics
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kritika
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90.1k
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A galvanometer can be converted to a voltmeter of full-scale deflection \(V_{0}\) by connecting a series resistance \(R_{1}\) and can be converted to an ammeter of full-scale deflection \(I_{0}\) by connecting a shunt resistance \(R_{2}\). What is the current flowing through the galvanometer at its full-scale deflection ?
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Dec 11, 2021
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Kinematics
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kritika
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90.1k
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1
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A very long charged solid cylinder of radius 'a' contains a uniform charge density \(\rho\). Dielectric constant of the material of the cylinder is \(\mathrm{k}\). What will be the magnitude of electric field at a radial distance ' \(\mathrm{x}\) ' \((\mathrm{x}<\mathrm{a})\) from the axis of the cylinder?
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Dec 11, 2021
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Kinematics
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kritika
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90.1k
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Four identical point masses, each of mass \(m\) and carrying charge \(+q\) are placed at the corners of a square of sides 'a' on a frictionless plain surface. If the particles are released simultaneously, the kinetic energy of the system when they are infinitely far apart is
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Dec 11, 2021
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Kinematics
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kritika
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90.1k
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The bob of a swinging seconds pendulum (one whose time period is \(2 \mathrm{~s}\) ) has a small speed \(\mathrm{v}_{0}\) at its lowest point. Its height from this lowest point \(2.25 \mathrm{~s}\) after passing through it is given by
asked
Dec 11, 2021
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Kinematics
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kritika
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90.1k
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1
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A tennis ball hits the floor with a speed \(v\) at an angle \(\theta\) with the normal to the floor. If the collision is inelastic and the co-efficient of restitution is \(\varepsilon\), what will be the angle of reflection ?
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Dec 11, 2021
in
Kinematics
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kritika
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90.1k
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0
votes
1
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A block of mass \(m\) rests on a horizontal table with a co-efficient of static friction \(\mu\). What minimum force must be applied on the block to drag it on the table ?
asked
Dec 11, 2021
in
Laws of motion
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kritika
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90.1k
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0
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3
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A fighter plane, flying horizontally with a speed \(360 \mathrm{kmph}\) at an altitude of \(500 \mathrm{~m}\) drops a bomb for a target straight ahead of it on the ground. The bomb .should be dropped at what approximate distance ahead of the target ? Assume that acceleration due to gravity \((\mathrm{g})\) is \(10 \mathrm{~ms}^{-2}\). Also neglect air drag
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Dec 11, 2021
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Kinematics
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kritika
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90.1k
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0
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Consider the vectors \(\vec{A}=\hat{i}+\hat{j}-\hat{k}, \vec{B}=2 \hat{i}-\hat{j}+\hat{k}, \vec{C}=\frac{1}{\sqrt{5}}(\hat{i}-2 \hat{j}+2 \hat{k})\). What is the value of \(\vec{C} \cdot(\vec{A} \times \vec{B}) ?\)
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Dec 11, 2021
in
Physics and measurements
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kritika
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90.1k
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The frequency \(v\) of the radiation emitted by an atom when an electron jumps from one orbit to another is given by \(v\) \(=\mathrm{k} \delta \mathrm{E}\), where \(\mathrm{k}\) is a constant and \(\delta \mathrm{E}\) is the change in energy level due to the transition. Then dimension of \(\mathrm{k}\) is
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Dec 11, 2021
in
Physics and measurements
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kritika
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90.1k
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5
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A common emitter transistor amplifier is connected with a load resistance of \(6 \mathrm{k} \Omega\). When a small a.c. signal of 15 \(\mathrm{mV}\) is added to the base emitter voltage, the alternating base current is \(20 \mu \mathrm{A}\) and the alternating collector current is \(1.8 \mathrm{~mA}\). What is the voltage gain of the amplifier ?
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Dec 11, 2021
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Kinematics
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kritika
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90.1k
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3
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For nuclei with mass number close to 119 and 238 , the binding energies per nucleon are approximately \(7.6 \mathrm{MeV}\) and \(8.6 \mathrm{MeV}\) respectively. If a nucleus of mass number 238 breaks into two nuclei of nearly equal masses, what will be the approximate amount of energy released in the process of fission?
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Dec 11, 2021
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Kinematics
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kritika
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90.1k
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0
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A nucleus \(X\) emits a beta particle to produce a nucleus \(Y\). If their atomic masses are \(M_{x}\) and \(M_{y}\) respectively, the maximum energy of the beta particle emitted is (where \(m_{e}\) is the mass of an electron and \(c\) is the velocity of light)
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Dec 11, 2021
in
Kinematics
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kritika
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90.1k
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3
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If \(R\) is the Rydberg Constant in \(\mathrm{cm}^{-1}\), then hydrogen atom does not emit any radiation of wave-length in the range of
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Dec 11, 2021
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Kinematics
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kritika
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90.1k
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In a Frounhofer diffraction experiment, a single slit of width \(0.5 \mathrm{~mm}\) is illuminated by a monochromatic light of wavelength \(600 \mathrm{~nm}\). The diffraction pattern is observed on a screen at a distance of \(50 \mathrm{~cm}\) from the slit. What will be the linear separation of the first order minima?
asked
Dec 11, 2021
in
Optics
by
kritika
(
90.1k
points)
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