$(a)$ Define circular motion.
$(b)$ "Uniform circular motion is an accelerated motion". Justify this statement with reason.
$(c)$ An artificial satellite is moving in a circular orbit of radius $42250\, km.$ Calculate its speed if it takes $24$ hours to revolve once around the earth.
$(a)$ Define circular motion.
$(b)$ "Uniform circular motion is an accelerated motion". Justify this statement with reason.
$(c)$ An artificial satellite is moving in a circular orbit of radius $42250\, km.$ Calculate its speed if it takes $24$ hours to revolve once around the earth.
$(a)$ If a body is moving along a circular path, then the body is said to be in circular motion.
$(b)$ Circular motion is an accelerated motion because the direction of its velocity is continuously changing but the magnitude of its velocity remains same.
$(c)$ Distance covered in one revolution
$2 \pi r=2 \times 3.14 \times 42250=265330\, km , t=24$ hour
Therefore, Speed $=\frac{\text { Distance }}{\text { Time }}=\frac{265330}{24}$
$=11055.42 km h ^{-1}$
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$(b)$ Give one example of non$-$uniform motion.
$(c)$ Two cars $A$ and $B$ have their $x-t$ graph as shown in figure. Which has greater velocity ?
$(d)$ What is the quantity which is measured by the area occupied below the velocity$-$time graph ?
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