The total energy of a particle executing SHM is 80 J
The total energy of a particle executing SHM is 80 J. What is the potential energy when the particle is at a distance of 3/4 of amplitude from mean position
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(a) 60 […]
Physics
An electric current passes through a long straight wire
An electric current passes through a long straight wire. At a distance 5 cm from the wire, the magnetic field is B. The field at 20 cm from the wire would be
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A 10 micro farad capacitor is charged to 500 V and then its plates are joined
A 10 micro farad capacitor is charged to 500 V and then its plates are joined together through a resistance of 10 ohm. The heat produced in the resistance is
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(a) 500 […]
A bomb of mass 30 kg at rest exploded into two pieces of masses 18 kg
A bomb of mass 30 kg at rest exploded into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass if 6 m/s. The kinetic energy of the other mass […]
The masses of two radioactive substances are same and their half lives
The masses of two radioactive substances are same and their half lives are 1 year and 2 years respectively. The ratio of their activities after 6 years will be
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(a) 1 : […]
In a water fall, the water falls from a height of 100 m. If the entire kinetic energy
In a water fall, the water falls from a height of 100 m. If the entire kinetic energy of water is converted into heat, the rise in temperature of water will be
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When the angle of incidence is 60° on the surface of a glass slab, it is found
When the angle of incidence is 60° on the surface of a glass slab, it is found that the reflected ray is completely polarised. The velocity of light in glass is
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(a) √2 […]
A spring of spring constant 5 x 10³ N/m is stretched initially by 5 cm
A spring of spring constant 5 x 10³ N/m is stretched initially by 5 cm from the unstretched position. The work required to stretch it further by another 5 cm is
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(a) […]
The density of ice is 0.9 g/cc and that of sea water is 1.1 g/cc
The density of ice is 0.9 g/cc and that of sea water is 1.1 g/cc. An ice berg of volume V is floating in sea water. The fraction of ice berg above water level is […]
A 1 kg particle strikes a wall with velocity 1 m/s at an angle 30° and reflects
A 1 kg particle strikes a wall with velocity 1 m/s at an angle 30° and reflects at the same angle. If it remains contact with wall for 0.1 sec, then the force is