Question

In the graph shown for change of state ,why are the melting and boiling point shown by a line drawn parallel to the time axis (or X-axis)

Answer 1

Explanation:

In a 400 meter race the athlete A, who came first completed the race in 80 seconds. After 70 seconds, he was 50 metres behind that of the athlete B, who came second. If athlete B has covered 360 metres after 70 seconds, then i) What is the distance covered by athlete A in last 10 seconds? ii) If athlete A was moving with an average velocity of 8 m/s till 70 seconds, then how much he had accelerated in last 10 seconds to reach his destination? iii) A stop watch was used to record the timings of the athletes. Draw a speed- time graph to show the nature of the motion exhibited by the hand of the stop watch if the watch is circular in shape.