Question

1. Simple harmonic motion is example of

2.Formula of Sin (alfa+ Beta ) =
3.Dimension of work is

4.If mass of body is doubled and radius also doubled the gravitational force is:
a. half b. increase four times c. becomes doubled d. NOT
5 .Unit of density =
6.Two circles of radius 3 cm and 4 cm touch each other externally. The distance between their centre is a
: 1cm b. 4cm c. 5cm d. 7em
D. is correct​

Answer 1

1  an oscillatory motion.

2  sin(α - β) = sinα cos β - cos α sin β.

3  [M1 L2 T-2].

4  If the mass of both of the objects is doubled, then the force of gravity between them is quadrupled; and so on. Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces.

5  Kilogram per cubic meter

6  The distance between their centres is 7 cm. If the radius of one circle is 4 cm, then the radius of the other circle will be. 3 cm. 4 cm.

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