(a) Define circular motion. (b) "Uniform circular motion is an accelerated motion". Justif

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7. MOTION

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$(a)$ 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.

Option A

Option B

Option C

Option D

Solution

$(a)$ 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 $=\frac{\text { Distance }}{\text { Time }}=\frac{265330}{24}$

$=11055.42 km h ^{-1}$

Standard 9

Science

A train is travelling at a speed of $90\, km h ^{-1}$. Breaks are applied so as to produce a uniform acceleration of $0.5\, m s ^{-2}$. Find how far the train will go before it is brought to rest.

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A frog hops along a straight line path from point $'A^{\prime}$ to point ${ }^{\prime} B ^{\prime}$ in $10\, s$ and then turns and hops to point ${ }^{\prime} C^{\prime}$ in another $5\, s$. Calculate the average speed and average velocity of the frog for the motion between $(a)(A)$ to $(B)(b)(A)$ to $(C)($ through $B)$

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What can you say about the motion of a body if its displacement$-$time graph is a straight line parallel to the time axis ?

easy

Two cars $A$ and $B$ have their displacement$-$time graph as given below. Which car has a greater velocity ?

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Differentiate between distance and displacement.

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$(a)$ 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.

Solution

Similar Questions

A train is travelling at a speed of $90\, km h ^{-1}$. Breaks are applied so as to produce a uniform acceleration of $0.5\, m s ^{-2}$. Find how far the train will go before it is brought to rest.

What can you say about the motion of a body if its displacement$-$time graph is a straight line parallel to the time axis ?

Two cars $A$ and $B$ have their displacement$-$time graph as given below. Which car has a greater velocity ?

Differentiate between distance and displacement.

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$(a)$ 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.