Explanation:
When the block kept at rest is hit by a bullet, the block acquires certain velocity by the conservation of linear momentum.
Therefore, the linear momentum and the kinetic energy of the block change.
As some of the kinetic energy carried by the bullet transforms into heat energy, its temperature also changes.
However, the gravitational potential energy of the block does not change, as the height of the block does not change in this process.
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Two resistances 
and 
are joined as shown in the figure to two batteries of e.m.f. 
and 
. If is short-circuited, the current through is
|
(a) |
(b) |
(c) |
(d) |
The focal length of a convex lens is 10 cm and its refractive index is 1.5. If the radius of curvature of one surface is 7.5 cm, the radius of curvature of the second surface will be
|
(a) 7.5 cm |
(b) 15.0 cm |
(c) 75 cm |
(d) 5.0 cm |
What is the reading of voltmeter in the following figure
|
(a) 3 V |
(b) 2 V |
(c) 5 V |
(d) 4 V |
