Physics - Gravitation

Question - 1

consider a body at rest on the surface of the rotating earth. if the gravitational force of attraction between the body and the earth vanishes but the earth is still rotating, the body will

  • A fly forward along the tangent to the earth's  surface 
  • B fly away outward along the radius of the 
  • C fly backward along the tangent to the earth's surface
  • D move backward a little distance and then remain at rest

Question - 2

the length of a seconds pendulum on a planet where g is 4.9 ms-2, is

  • A 12.5 cm
  • B 50 cm
  • C 100 cm
  • D 200 cm

Question - 3

the angular velocity of a geo-stationary satellite is 

  • A \(\frac { \pi }{ 12 } deg\quad { h }^{ -1 }\)
  • B \(\frac { \pi }{ 6 } deg\quad { h }^{ -1 }\)
  • C 15 deg h-1
  • D 15 rad h-1

Question - 4

the moon completes its one revolution around the earth is 27 days. A satellite encircling the earth in a orbit of radius equal to half of the satellite will complete its ine revolution in nearly

  • A \(\frac { 27 }{ { (4) }^{ 1/3 } } \) days and will resolve 2.7 times faster
  • B 10 days and will resolve 2.7 times faster
  • C 13.5 days and will resolve 2.7 times faster
  • D 19 days and will resolve with the same speed

Question - 5

A satellite is orbiting in a circular orbit around the earth. a book is just dropped out of it. 

  • A the book will describe a parabolic path in the direction  of motion of the satellite
  • B the book will fall towards the earth and the satellite will  rise up slightly
  • C the book will describe a parabolic path opposite to ythe direction of motion of the satellite
  • D the book will describe the circular motion parallel to the direction of the motion  of the satellite

Question - 6

the value of the gravitational constant (G)

  • A depends on the nature of masses
  • B depends on the location of masses in the universe
  • C is a constant when earth and any other body in the universe are involved
  • D none of the above

Question - 7

if the distance between the sun and the earth is increased to four times its present value. the centripental force of the revolution of the will

  • A increase to four times its present value
  • B decrease to sixteen times its present value
  • C increase to sixteen times its present value
  • D increase to eight times its presnt value

Question - 8

the angular velocity of a satellite just above around a planet of density \(\rho \) is \(\omega \) . if G universal gravitational constant, then the ratio \(\frac { \omega }{ \sqrt { \rho G } } \) is nearly equal to

  • A 2
  • B 0.5
  • C 4
  • D 0.25

Question - 9

the  inertial mass of a body is considered as

  • A the mass at rest
  • B the mass in motion
  • C referred to gravitational pull
  • D the concept in effective weight

Question - 10

the matter from a rotating star of radius R  starts to escape from its equater or if the angular velocity of star proportional to

  • A \(\sqrt { R } \)
  • B \(\sqrt { R } \)3
  • C \(\frac { 1 }{ \sqrt { R } } \)
  • D \(\frac { 1 }{ \sqrt { R } } \)3
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