Question

Find the value of acceleration due to gravity on a star whose mass is 3 x 1030 kg and radius is 1.8 x 108 m. Given G = 6.67 x 10-11 N m2 kg-​​

Answer 1

Step-by-step explanation:

Given : Mass of earth m=6×10

24

kg

Mass of Sun M=2×10

30

kg

Distance between sun and earth r=1.5×10

11

m

Force of gravitation between them F=

r

2

GMm

F=

(1.5×10

11

)

2

6.67×10

−11

×(6×10

24

)×(2×10

30

)

=3.557×10

22

N

Answer 2

Answer:-

➙ A ball A is dropped from top of a tower. When it has fallen by 80 m from the top, another ball B is dropped from a point 120 m below the top. If both the balls reach the ground at the same moment, then the height of the tower will be 30 m/s.

Nisa has 3 different sorts of cards in a game: apple , cherry and grapes She chooses 2 cards from the set and swaps their places. She wants to arrange the cards so that all the cards with the same fruit on are next to each other.

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