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Matter In Our Surroundings
A body moves with a velocity of 2 m/s for 5 s, then its velocity uniformly increases to 10 m/s in next 5 s. Thereafter its velocity begins to decrease at a uniform rate until it comes to rest after 10 s.
(a) Plot a velocity-time and distance-time graph for the motion of the body.
(b) Mark the portions of the graph to show when the motion of the body is uniform and when it is non-uniform.
(c) From the graph find the total distance moved by the body after 2 s and 12 s and in the last 10 s.
(a) Fig. 8.34 shows the velocity-time graph and Fig. 8.35 shows the distance-time graph for the motion of the body.
Fig. 8.34. Velocity-time graph.
Fig. 8.35. Distance-time graph.
(b) From velocity-time, graph as shown in the fig., we note that the motion is uniform in portion AB and non-uniform in portions BC and CD.
(c) From distance-time graph, we observe the following:
Distance moved after 2 s = 4 m.
Distance moved after 12 s = 50 m.
Distance moved in last 10 s = 90 - 40
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Convert the following temperature to Celsius scale.
573 K
Convert the following temperatures to Kelvin scale
25°C
What is the physical state of water at
100 °C
For any substance, why does the temperature remain constant during the change of state ?
Suggest a method to liquify atmospheric gases.
Convert the following temperatures to Kelvin scale.
35°C
Give reason for the following observations.
Naphthalene balls disappear with time without leaving any solid.
Give reason for the following observations.
We can get the smell of perfume sitting several metres away.
What is the physical state of water at
a) 25°C
b)00C
c)1000C
What is the physical state of water at
0°C
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