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20J of heat energy is extracted from a cold reservoir when 30J of work is done on a refrigerator. What is the coefficient of the refrigerator?
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Oct 3, 2021
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Class-XI-PHYSICS
by
AdilsonLima
cbse
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What is the relation between work obtained in an reversible and irreversible process?
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Oct 3, 2021
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Class-XI-PHYSICS
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AdilsonLima
cbse
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A particle of mass m starts from the mean position of a SHM, at t=0, and goes towards -A. If the angular frequency of SHM is w, find the force acting on it as a function of time.
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Oct 3, 2021
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Class-XI-PHYSICS
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AdilsonLima
cbse
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Consider a particle undergoing an SHM of amplitude A & angular frequency w. What is the magnitude of displacement from the mean position when kinetic energy is equal to the magnitude of potential energy?
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Oct 3, 2021
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Class-XI-PHYSICS
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AdilsonLima
cbse
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What happens to the energy of a particle, in SHM, with time in the presence of damping forces?
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Oct 3, 2021
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Class-XI-PHYSICS
by
AdilsonLima
cbse
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What does the given equation: x = Asin(ky+wt+a) represent?
asked
Oct 3, 2021
in
Class-XI-PHYSICS
by
AdilsonLima
cbse
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1
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The gravitational potential energy of a body at a distance “r” from the centre of the earth is V. Its weight at a distance “2r” from the centre of the earth is _____
asked
Oct 3, 2021
in
Class-XI-PHYSICS
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AdilsonLima
cbse
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The velocity with which an object should be projected from the surface of the earth such that it reaches a maximum height equal to “n” time the radius of earth “R” is _____
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Oct 3, 2021
in
Class-XI-PHYSICS
by
AdilsonLima
cbse
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1
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The value ofthe gravitational field in a region is given by g = 2i + 3j. What is the change in gravitational potential energy of a particle of mass 5kg when it is taken from the origin O(0,0) to a point P(10, -5)?
asked
Oct 3, 2021
in
Class-XI-PHYSICS
by
AdilsonLima
cbse
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1
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The satellites orbiting the earth, eventually fall to the earth when they are left unsupervised or unattended because _____
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Oct 3, 2021
in
Class-XI-PHYSICS
by
AdilsonLima
cbse
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Two satellites of masses 50 kg and 100 kg revolve around the earth in circular orbits of radii 9R and 16R. What is the ratio of speeds of the two satellites?
asked
Oct 3, 2021
in
Class-XI-PHYSICS
by
AdilsonLima
cbse
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Most waves used for communication purposes rely on geostationary satellites because _____
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Oct 3, 2021
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Class-XI-PHYSICS
by
AdilsonLima
cbse
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1
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A geostationary satellite seems to be fixed in the sky because it does not orbit the earth.
asked
Oct 3, 2021
in
Class-XI-PHYSICS
by
AdilsonLima
cbse
0
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1
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A geosynchronous satellite always appears fixed in the sky.
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Oct 3, 2021
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Class-XI-PHYSICS
by
AdilsonLima
cbse
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1
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A completely elastic solid body partially regains its shape after removal of external force. True or False?
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Oct 3, 2021
in
Class-XI-PHYSICS
by
AdilsonLima
cbse
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1
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Stress in a solid body is defined as ___________ per unit area.
asked
Oct 3, 2021
in
Class-XI-PHYSICS
by
AdilsonLima
cbse
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1
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A car containing a beaker of water is moving horizontally on a level road. Consider two points, A & B, inside the water such that they are on the same horizontal level and are separated by a distance L.
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Oct 3, 2021
in
Class X
by
AdilsonLima
cbse
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Temperature is absolute. True or False?
asked
Oct 3, 2021
in
Class-XI-PHYSICS
by
AdilsonLima
cbse
0
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1
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At a given temperature a body emits energy of a single wavelength corresponding to that temperature. True or False?
asked
Oct 3, 2021
in
Class-XI-PHYSICS
by
AdilsonLima
cbse
0
votes
1
answer
Two bodies in thermal equilibrium can have different pressures. True or False?
asked
Oct 3, 2021
in
Class-XI-PHYSICS
by
AdilsonLima
cbse
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