We use the alloy invar in pendulum clocks.

An alloy is

The amplitude of a simple pendulum decreases with time. But there is no decrease in the amplitude of a pendulum clock. Why?

(A) : Invar is used in metal tapes, balance wheels and pendulum clocks. ( R) : The coefficient of linear expansion of invar is very low.

What is a simple pendulum ? Is the pendulum used in a pendulum clock simple pendulum ? Give reason to your answer.

The length of minutes hand in a pendulum clock is 10 cm. The speed of the tip of the hand is

The time represented by the clock hands of a pendulum clock depends on the number of oscillations performed by pendulum. Every time it reaches to its exterme position the second hand of the clock advances by one second that means second hand moves by two second when one oscillation is completed. (a) How many number of oscillations completed by pendulum of clock in 15 minutes at calibrated temperature 20^(@)C (b) How many number of oscillations are completed by a pendulum of clock in 15 minutes at temperature of 40^(@)C if alpha = 2 xx 10^(-5)//"^(@)C (c ) What time is represented by the pendulum clock at 40^(@)C after 15 minutes if the initial time shown by the clock is 12:00 pm? (d) If the clock gains two seconds in 15 minutes in correct clock then find-(i) Number of extra oscillations (ii) New time period (iii) change in temperature.

The time period of a pendulum clock is :

If the length of a simple pendulum of a clock incrreases by 2% how much loss or gain of second per day will take place ?

Why do we use invar material for the pendulum of good clocks ?

Statement-1 : Pendulum clocks go slow in summer and fast in winter. Statement-2 : The length of the pendulum used in clock increases in summer.