Question

A turntable of radius 25cm and rotational inertia 0.0154kg.m^2 is spinning freely at 22rev/min about its central axis, with a 19.5g mouse on its outer edge. the mouse walks from the edge to the center. find the new rotational speed and the work done by the mouse

Answer 1

Explanation:

C)

Let the cost price be x

Since profit is given as 20%, selling price will be (1+0.2)x

Thus, selling price would be 1.2x.

When C.P. and S.P. are Rs. 20 less then,

C.P. =x−20

S.P. =1.2x−20

According to the given condition,

Now, 1.2x−20=1.3×(x−20)

⇒1.2x−20=1.3x−26

⇒1.3x−1.2x=−20+26

⇒0.1x=6

⇒x=60

therefore, the cost price of the article is Rs. 60.

Answer 2

Answer:

rs -60

Explanation:

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