A pendulum has time period 2 s. If its length is increased by 4 times, new period is MCQ with Answer and Explanation

Explanation:
Nichrome (alloy of nickel, chromium) has high resistivity and high melting point, doesn't oxidize easily at high temperature. Copper has low resistivity, not suitable for heating element.

Explanation:
p = m v = 5 × 2 = 10 kg m/s. Direction same as velocity. Momentum vector. Unit kg·m/s.

Explanation:
The height of capillary rise is given by Jurin's law: h = 2Tcos(theta) / (rrhog). In a freely falling elevator, the effective acceleration due to gravity (g') is zero (weightlessness). As effective g approaches zero, the theoretical height h approaches infinity. In reality, the water will rise to the very top of the tube, regardless of its length, but will not overflow.