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A ball of mass m is dropped from a height h on to a rigid floor. If e is the coefficient of restitution, the time required for complete bounce is
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A stone is projected from a horizontal plane. It attains maximum height ‘H’ & strikes a stationary smooth wall & falls on the ground vertically below the maximum height. Assuming the collision to be elastic the height of the point on the wall where ball will strike is
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A stone is projected from a horizontal plane. It attains maximum height ‘H’ & strikes a stationary smooth wall & falls on the ground vertically below the maximum height. Assuming the collision to be elastic the height of the point on the wall where ball will strike is
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Two short magnets are placed on a peice of cork which floats on water .The magnets are so arranged that the axis of one produced bisects the axis of the other at right angles .Then the cork will-
1. rotates only
2. moves along a straight line
3. has rotational as well as translational
4. has neither translational nor rotational
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A magnetic needle is kept in a nonuniform magnetic feild . It experiences -
a force or a torque or both???
why??
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If a magnet is kept in air surrounded by an iron ring .The lines of forces from the magnet will be-
1. crowded in the air
2. evenly distributed
3.crowded in the ring
4. unevenly distributed
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A hollow sphere is filled with water through a small hole in it. It is then hung by a long thread and made to oscillate. As the water slowly flows out of the hole at the bottom, the period of oscillation will
(A) Continuously increase
(B) Continuously decrease
(C) First increase and then decrease to original value
(D) First decrease and then increase to original value
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A particle of mass m is attached to a spring of spring constant k and has a natural angular frequency w0. An external force F(t) proportional to coswt(w!=w0) is applied to the oscillator. The time displacement of the oscillator will be proportional to?
(A)m/(w02-w2)
(B)1/m*(w02-w2)
(C)1/m*(w02+w2)
(D)m/(w02+w2)
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A particle of mass m is attached to a spring of spring constant k and has a natural angular frequency w0. An external force F(t) proportional to coswt(w!=w0) is applied to the oscillator. The time displacement of the oscillator will be proportional to?
(A)m/(w02-w2)
(B)1/m*(w02-w2)
(C)1/m*(w02+w2)
(D)m/(w02+w2)
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SIR PLEASE GIVE ME A PROOF THAT
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SIR PLEASE GIVE ME A PROOF THAT
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find the length of the perpendicular drawn upon the plane 3x - 6y + 5z = 12 from the origin.
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) according to a book “if a soft iron is placed inside the
solenoid the intensity of field increases.”
MY VIEW: But since
soft iron is a magnetic substance, so the soft iron will convert into a magnet which
will have poles opposite to the polls of the magnetic poles of the solenoid. As
a result of which the net magnetic field will be reduced.
Sir please clarify the above statement.
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according to a book “if a soft iron is placed inside the solenoid the intensity of field increases.”
MY VIEW: But since soft is a magnetic substance, so the soft iron will convert into a magnet which will have poles opposite to the polls of the magnetic poles of the solenoid. As a result of which the net magnetic field will be reduced.
Sir please clarify the above statement.
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according to the definition of solenoid:
“When large number of turns of insulated copper wire is wound on a tube of thick paper or asbestos of china clay, then this long helical coil is called solenoid.”
Why we use copper instead of any other conductor in making a solenoid?
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equatorial line refers to the perpendicular bisector to the centre of the axis.
Am I correct? If not then what does it mean by equatorial position?
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according to a book, “earth’s magnetic field is uniform only for a short region of space “
Since the magnetic field of earth determines the geographical south and north direction.
If earth’s magnetic field is not uniform then the magnet cannot determine the correct geographical north and south direction.
Sir please clarify the above statement
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according to a book, “earth’s magnetic field is uniform only for a short region of space “
Since the magnetic field of earth determines the geographical south and north direction.
If earth’s magnetic field is not uniform then the magnet cannot determine the correct geographical north and south direction.
Sir please clarify the above statement
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how we place the magnetic keepers and how does it conserves the magnetic property of a magnet? Please explain
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what is reason behind the face, which states that:
“If a magnet is kept isolated for a long interval of time, then its magnetic property decreases.”
