An accurate clock shows the time as 3.00. After hour hand has moved 135°, the time would be

(a) the displacement is zero (d) the average velocity is zero Explanation: In one hour the tip of minute hand comes to the same position, so its displacement and average velocity is zero. Hence (a) and (d)...

The pendulum of the clock has time period 2.04sec. Now, No. or oscillation in 1 day = 24 x 3600/2= 43200 But, in each oscillation it is slower by (2.04 – 2.00)...

(a) the displacement is zero (d) the average velocity is zero Explanation: In one hour the tip of minute hand comes to the same position, so its displacement and average velocity is zero....

(c) The minute hand move over in 60 minutes = 360° So, angle made by minute hand in a minute =360°/60 = 6° So, in a period of 2 hours 20 minutes...

(b) No. of right angles in one hour = 2 ∴No. of right angles in 24 hours = 24 × 2 = 48

(d) Angle made by hour hand for 12 hours = 360° Angle made by hour hand for 1 hour = 360°/12 Angle made by hour hand for 6 hours =  360°/12 (6)...

(c) In one hour, hour hand and minute hand are at right angles 2 times. Time = 10 p.m – 1 p.m = 9 hr. ∴ No. of times, when both hands are...

(A) South-West

(A) North-East

The noise level is quite low at night. Therefore the sound of the clock appears much clearer at night than in the day.