JEE Main 2022 (Online) 28th June Evening Shift | Gravitation Question 78 | Physics

Water falls from a 40 m high dam at the rate of 9 $$\times$$ 10⁴ kg per hour. Fifty percentage of gravitational potential energy can be converted into electrical energy. Using this hydroelectric energy number of 100 W lamps, that can be lit, is :

(Take g = 10 ms^$$-$$2)

100

JEE Main 2022 (Online) 28th June Evening Shift

MCQ (Single Correct Answer)

-1

Two objects of equal masses placed at certain distance from each other attracts each other with a force of F. If one-third mass of one object is transferred to the other object, then the new force will be :

$${2 \over 9}$$ F

$${16 \over 9}$$ F

$${8 \over 9}$$ F

JEE Main 2022 (Online) 28th June Morning Shift

MCQ (Single Correct Answer)

-1

Two planets A and B of equal mass are having their period of revolutions T_A and T_B such that T_A = 2T_B. These planets are revolving in the circular orbits of radii r_A and r_B respectively. Which out of the following would be the correct relationship of their orbits?

$$2r_A^2 = r_B^3$$

$$r_A^3 = 2r_B^3$$

$$r_A^3 = 4r_B^3$$

$$T_A^2 - T_B^2 = {{{\pi ^2}} \over {GM}}\left( {r_B^3 - 4r_A^3} \right)$$

JEE Main 2022 (Online) 27th June Evening Shift

MCQ (Single Correct Answer)

-1

The distance of the Sun from earth is 1.5 $$\times$$ 10¹¹ m and its angular diameter is (2000) s when observed from the earth. The diameter of the Sun will be :

2.45 $$\times$$ 10¹⁰ m

1.45 $$\times$$ 10¹⁰ m

1.45 $$\times$$ 10⁹ m

0.14 $$\times$$ 10⁹ m

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