The work done by the gravitational force when a body is moved horizontally on Earth's surface is:
A. Depends on speed
B. Positive
C. Negative
D. Zero
Answer: Option D
Solution (By JKSSB Mock Tests)
Gravitational force acts vertically downward. For horizontal displacement, the angle between force and displacement is 90°, so work W = F·d·cos90° = 0. Gravity does no work for horizontal motion; it only does work for vertical displacement components. Memory aid: 'Work = F d cosθ; θ=90° ⇒ W=0'.
Explanation:
Nuclear fission is the process where a heavy, unstable nucleus (like Uranium-235) is split into two smaller, stable nuclei when bombarded with a neutron. This process releases a massive amount of energy and more neutrons, triggering a chain reaction. Nuclear fusion is the opposite process (combining light nuclei).
Explanation:
Copper wire obeys Ohm's law (V ∝ I) at constant temperature. Diode, transistor are non-ohmic (non-linear). Electrolytes can be non-linear. Metals are ohmic.
No comments yet. Be the first to start the discussion!