Answer:
Displacement = 70 m towards east
Explanation:
Displacement is the shortest distance between the two points.
Let us say that he starts at the point O and travels in a path ABC.
If we join the initial and final point of the path travelled by him, it will give the displacement of the man.
Distance from O to A = 40 m
Distance from A to B = 70 m
Distance from B to C = 40 m
Distance from O to A = Distance from B to C
We want the displacement which is distance between the points O and C
In rectangle opposite sides are equal. Hence Distance from O to C = Distance from A to B
Displacement = Distance from A to B
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The best reason for buckling of rail tracks on hot summer days is the thermal expansion or compressive forces acting on the rail tracks.
<u>Explanation:</u>
The rail tracks are composed of metals and they are rigidly connected with each other. If the materials used in construction of rail tracks are old, then there can be weakening of the track materials leading to decrease in their resistivity to thermal heat.
So this increase in temperature on hot days leads to compressive stress on the tracks which causes the tracks to expand and misaligned themselves.
Also the loosening of the ballast, ties and fasteners enhance the speed of buckling on hot summer days. Thus due to thermal expansion of the materials of the tracks, they buckle up as there is no space for desired expansion.
"Graph A" is the one among the following stars given in the question that is most<span> likely to end up as a supernova. The correct option among all the options that are given in the question is the first option. I hope that this is the answer that has actually come to your great help.</span>
Answer:
combination of strength and speed
Explanation:
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