26244.A artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy E0. Its potential energy is
2E0
E0
1.5 E0
–E0
26245.The dimensions of universal gravitational constant are
M2 L2 T-2
M-1 L3 T-2
M L-1 T-2
M L2 T-2
26246.A thief stole a box with valuable article of weight ‘W’ and jumped down a wall of height h. Before he reach the ground he experienced a load of
zero
W / 2
W
2 W
26247.The orbit velocity of an artificial satellite in a circular orbit just above the earth’s surface is v. For a satellite orbiting at an altitude of half of the earth’s radius, the orbital velocity is
$\dfrac{ev}{2}$
$\sqrt{\dfrac{3}{2}v}$
$\sqrt{\dfrac{2}{3}v}$
$\dfrac{2}{3v}$
26248.A satellite is orbiting close to the surface of the earth, then its speed is
$\sqrt{2gR}$
Rg
$\sqrt{Rg}$
$\sqrt{\dfrac{Rg}{2}}$
26249.If the change in the value of g at the height h above the surface of the earth is the same as at a depth x below it, then (both x and h being much smaller than the radius of the earth)
x = h
x = 2 h
x = $\dfrac{h}{2}$
x = h2
26250.The period of a satellite in a circular orbit of radius R is T. The period of another satellite in circular orbit of radius 4R is
T/4
8T
2T
T/8
26251.A planet moves around the sun. At a point A, it is closest from the Sun at a distance d1 and has a speed v1. At another point B, when it is farthest from the sun at a distance d2, its speed will be
$\dfrac{d_{1}v_{1}}{d_{2}}$
$\dfrac{d_{2}v_{1}}{d_{1}}$
$\dfrac{d_{1}^{2}v_{1}}{d_{2}^{2}}$
$\dfrac{d_{2}^{2}v_{1}}{d_{1}^{2}}$
26252.Acceleration due to gravity g in terms of mean density of Earth d (where R is radius of earth and G – universal gravitational constant) is
g = 4πR2 d G
g = $\dfrac{4\pi R^{2}G}{d}$
g = $\pi \dfrac{3}{4}RdG$
g = $\pi \dfrac{4}{3}pRdG$
26253.Geo-stationary satellite
revolves about the polar axis
has a time period less than that of the earth’s satellite
moves faster than a near earth satellite
is stationary in the space