Hi, I have a couple of questions and i was hoping anyone could be help me by exp

Question

Hi,
I have a couple of questions and i was hoping anyone could be help me by explaining logically the reason for the right answer, Thanks :)

1(i) A simple pendulum is suspended from the ceiling of a stationary elevator, and the period is measured. If the elevator moves with constant velocity, does the period:
a) increase

b) decrease

c) remain the same

(ii) If the elevator accelerates upwards, does the period

a) increase

b) decrease

c) remain the same

2) A pendulum clock depends on the period of a pendulum to keep correct time. Suppose a pendulum clock is keeping correct time and Dennis the Menace slides the bob of the pendulum downward on the oscillatory rod. Does the clock run

a) slow

b)fast

c) correctly

Explanation / Answer

pendulum period T = 2 sqrt(L/g)

1. (i) c)

elevator moves in constant speed means no acceleration.

(ii) b)

when elevator accelerates upward, the effective g increases, thus period decreases.

2. a)

As L increases, period will increase, so it will run slow

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