A block has been placed on an inclined plane with the slope angle θ, block slide down the plane at constant speed. The coefficient of kinetic friction is equal to
1. sin θ 2. cos θ 3. g 4. tan θ
Subtopic: Friction |
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During SHM, a particle has displacement x from mean position. If acceleration. Kinetic energy and excess potential energy are represented by a K and U respectively, then choose the appropriate graph
A charged spherical conductor of radius a and charge q, is surrounded by another charged concentric sphere of radius b (b > a) . The potential difference between conductors is V. When, the spherical conductor of radius b is discharged completely, then the potential difference between conductor will be
Silver and copper voltmeters are connected in parallel with a battery of emf 12 V. In 30 min 1 g of silver and 1.8 g of copper are liberated. The energy supplied by the battery is
1. 720 J 2. 2.41 J 3. 24.12 J 4. 4.34 × 104 J
Subtopic: Heating Effects of Current |
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A magnet is cut in three equal parts by cutting it perpendicular to its length. The time period of original magnet is T0 in a uniform magnetic field B. Then, the time period of each part in the same magnetic field is