1
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
Two cars of masses m1 and m2 are moving in circles of radii r1 and r2, respectively. Their speeds are such that they make complete circles in the same time t. The ratio of their centripetal acceleration is
A
m1r1 : m2r2
B
m1 : m2
C
r1 : r2
D
1 : 1
2
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
The mass of a spaceship is $$1000$$ $$kg.$$ It is to be launched from the earth's surface out into free space. The value of $$g$$ and $$R$$ (radius of earth ) are $$10\,m/{s^2}$$ and $$6400$$ $$km$$ respectively. The required energy for this work will be:
A
$$6.4 \times {10^{11}}\,$$ Joules
B
$$6.4 \times {10^8}\,$$ Joules
C
$$6.4 \times {10^9}\,$$ Joules
D
$$6.4 \times {10^{10}}\,$$ Joules
3
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
Two bodies of masses $$m$$ and $$4$$ $$m$$ are placed at a distance $$r.$$ The gravitational potential at a point on the line joining them where the gravitational field is zero is:
A
$$ - {{4Gm} \over r}$$
B
$$ - {{6Gm} \over r}$$
C
$$ - {{9Gm} \over r}$$
D
zero
4
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
The height at which the acceleration due to gravity becomes $${g \over 9}$$ (where $$g=$$ the acceleration due to gravity on the surface of the earth) in terms of $$R,$$ the radius of the earth, is:
A
$${R \over {\sqrt 2 }}$$
B
$$R/2$$
C
$$\sqrt 2 \,\,R$$
D
$$2\,R$$
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