Boojho walks to his school which is at a distance of 3 km from his home in 30 min. On reaching, he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 min. His average speed in $km / h$ is
The diagram shows a pendulum in periodic motion. The time period of a pendulum is the time taken by the bob to make one complete oscillation. What would be the movement of the bob for one complete oscillation of the pendulum?
Two clocks A and B are shown in figure. Clock A has an hour and a minute hand whereas clock B has an hour hand, minute hand as well as a second hand. Which of the following statement is correct for these clocks?
A
A time interval of 30s can be measured by clock A
B
A time interval of 30s cannot be measured by clock B
✓
Time interval of 5 min can be measured by both A and B
D
Time interval of 4 min 10s can be measured by clock A
Answer
Correct option: C.
Time interval of 5 min can be measured by both A and B
The table lists a few motions which relate to measuring time. (i) Motion of pendulum. (ii) Sand falling in an hourglass. (iii) Change in the position of shadow. Which of these motions can be considered as a periodic motion?
A student wants to measure the speed of a ball rolling down a ramp. He found a few instruments which are listed in the lists. (i) Hourglass (ii) Thermometer (iii) Measuring tape (iv) Stopwatch (v) Balance scale Which of these are required to measure the speed of the ball?
Figure shows an oscillating pendulum Time taken by the bob to move from A to C is $t_1$ and from C to O is $t_2$ The time period of this simple pendulum is