The percentage error in measurement of a cube's side is 2%. Maximum percentage error in its volume is: MCQ with Answer and Explanation

Explanation:
3 half-lives (9/3=3) => (1/2)³ = 1/8.

Explanation:
By conservation of momentum: initial momentum = 0 (system at rest). Final momentum: m_bullet×v_bullet + m_gun×v_gun = 0. Thus (0.02 kg)(300 m/s) + (2 kg)(v_gun) = 0 ⇒ 6 + 2v_gun = 0 ⇒ v_gun = -3 m/s. Magnitude is 3 m/s; negative sign indicates opposite direction to bullet. This demonstrates momentum conservation in isolated systems. Memory tip: Recoil velocity = -(m_bullet/m_gun)×v_bullet. Such numerical problems test application of conservation laws, frequently appearing in competitive exams with varying mass ratios and velocities.

Explanation:
Work = force × displacement in direction of force. Displacement zero, so work zero. Physiology work is done internally, but physics work zero.