Gravitation-Energy [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 5 - 8 of 19

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Question 5

Question MCQ▾

A body of mass 250 kg falls on the earth from infinity. What will be its energy on reaching the earth? Radius of the earth is 6400 km and g = 9.8 m/s2 . Air friction is negligible.

Choices

Choice (4)Response

a.

1.56 ⨯ 1010 J

b.

1.27 ⨯ 109 J

c.

2.27 ⨯ 1010 J

d.

2.54 ⨯ 109 J

Edit

Question 6

Question MCQ▾

If g is the acceleration due to gravity on the earth՚s surface the gain in P. E. of an object of mass m raised from the surface of the earth to a height of the radius R of the earth is -

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 7

Question MCQ▾

With what velocity must a body be thrown upward form the surface of the earth so that it reaches a height of 10 Re? Mass of earth M = 6 ⨯ 1024 kg, radius Re = 6.4 ⨯ 106 m and G = 6.67 ⨯ 10-11 N-m2 /kg2 .

Choices

Choice (4)Response

a.

10.7 ⨯ 103 m/s

b.

10.7 ⨯ 105 m/s

c.

1.07 ⨯ 104 m/s

d.

10.7 ⨯ 104 m/s

Edit

Question 8

Question MCQ▾

The masses and the radius of the earth and the moon are M1 , M2 and R1 , R2 respectively their centers are at distance d apart. The minimum speed with which a particle of mass m should be projected form a point midway between the two centers so as to escape to infinity will be

Choices

Choice (4)Response

a.

b.

c.

d.

Edit