• 9.8 m/sec²
• 4.9 m/sec²
• 19.6 m/sec²
• 2.45 m/sec²
• #### 2.  A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is

• Positive
• Negative
• Zero
• may be positive or negative
• #### 3.  If the radius of the earth were to be raise by 1% its mass remaining the same, the acceleration due to gravity on the surface of the earth will

• increase by 1%
• decrease by 2%
• decrease by 1%
• increase by 2%

• R
• R/2
• R/3
• R/4

• 7 km/sec
• 112 km/sec
• 12.2 km/sec
• 1.1 km/sec
• #### 6.  Who among the following first gave the experimental velocity of G?

• Cavendish
• Copernicus
• Brook Taylor
• none of these
• #### 7.  A satellite S is move in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth .

• The acceleration of S is always directed towards the centre of the earth.
• The angular momentum of S about the centre of the earth changes in direction, but its magnitude remains constant.
• The total mechanical energy of S varies periodically with time.
• The linear momentum of S remains constant in magnitude.

• r²g / w
• R²w²/ g
• RG w²
• R²g / w²

• 64.5
• 129
• 182.5
• 730
• #### 10.  The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio.

• 1 : 2
• 2 : 1
• 3 : 5
• 5 : 3
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Practice More On Chapter 8 Gravitation
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