A geostationary satellite is orbiting the earth at a height of 5R above that surface of the earth, R being the radius of the earth. The time period of another satellite in hours at a height of 2R from the surface of the earth is
5
10
A spherical planet has a mass Mp and diameter Dp. A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity, equal to
4GMp/Dp2
GMpm/Dp2
GMpm/ Dp2
GMpm/ Dp2
An alternating electric field of frequency v is applied across the dees (radius =R ) of a cyclotron that is being used to accelerate protons (mass = m). The operating magnetic field (B) used in the cyclotron and the kinetic energy (K) of the proton beam, produced by it are given by
Two sphere A and B of masses m1 and m2 respectively collide. A is at rest initially and B is moving with velocity v along the x -axis. After the collision, B has a velocity v/2 in a direction perpendicular to the original direction. The mass A moves after collision in the direction
same as that of B
opposite to that of B
If the radius of a star is R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q?
Q/4πR2σ
(Q/4πR2σ)-1/2
(4πR2Q/σ)1/4
(4πR2Q/σ)1/4
The damping force on an oscillator is directly proportional to the velocity. The units of the constant of proportionality are
kg ms-1
kg ms-2
kgs-1
kgs-1
Liquid oxygen at 50 K is heated to 3000 K at a constant pressure of 1 atm. The rate of heating is constant. which one of the following graphs represents the variation of temperature with time?
A.
Graph (a) shows the variation temperature with time. At first temperature will increase then there will be state change from liquid to gas.
One mole of an ideal gas goes from an initial state A to final state B via two processes. It first undergoes isothermal expansion from volume V to 3V and then its volume is reduced from 3V to V at constant pressure. The correct p-V diagram representing the two processes is
A solid cylinder of mass 3 kg is rolling on a horizontal surface with velocity 4 ms-1. It collides with horizontal springs of force constant 200 Nm-1. The maximum compression produced in the spring will be
0.5 m
0.6 m
0.7 m
0.7 m
A thermodynamic system is taken through the cycle ABCD as shown in a figure. Heat rejected by the gas during the cycle is
2 pV
4 pV
1/2 pV
1/2 pV