1
AP EAPCET 2022 - 4th July Morning Shift
+1
-0

A projectile is thrown straight upward from the earth's surface with an initial speed $$v=\alpha v_e$$ where $$\alpha$$ is a constant and $$v_e$$ is the escape speed. The projectile travels upto a height 800 km from earth's surface, before it comes to rest. The value of the constant $$\alpha$$ is (radius of the earth $$=6400 \mathrm{~km}$$)

A
$$\frac{1}{3}$$
B
$$\frac{1}{2}$$
C
$$\frac{2}{3}$$
D
$$\frac{3}{4}$$
2
AP EAPCET 2021 - 20th August Morning Shift
+1
-0

The gravitational potential energy is maximum at

A
infinity
B
the earth's surface
C
the centre of the earth
D
twice the radius of the earth
3
AP EAPCET 2021 - 20th August Morning Shift
+1
-0

A geostationary satellite is taken to a new orbit, such that its distance from centre of the earth is doubled. Then, find the time period of this satellite in the new orbit.

A
24 h
B
4.8 h
C
48$$\sqrt2$$ h
D
24$$\sqrt2$$ h
4
AP EAPCET 2021 - 19th August Evening Shift
+1
-0

The distance through which one has to dig the Earth from its surface, so as to reach the point where the acceleration due to gravity is reduced by 40% of that at the surface of the Earth, is (radius of Earth is 6400 km)

A
2560 km
B
3000 km
C
3260 km
D
1560 km
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