An astronaut approaching the moon sends a radio signal of frequency `5 xx 10^(3)` MHz towards moon to find the speed of his rocket . The frequency of waves reflected back from the moon to find the speed of his rocket . The frequency .Calculate the velocity of the rocket relative to the moon.
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A series RLC circuit is in resonance with a source of frequency `omega_(0)` = 10 MHz. The current amplitude in the circuit is `I_(0)`. It was found th
Correct Answer - 0.25mH
2 Answers 2 views
A mass 2m moving with some speed is directly approaching another mass m moving with double speed.
Correct answer is (B) 3/2
2 Answers 25 views
Anthony spends `x%` of his salary towards expending on food , 2x% of the remaining on transport 3x% of the remaining towards various bills 4x% of the
Correct Answer - `F,T,I,R`
2 Answers 1 views
An astronaut accidentally gets separated out of his small spaceship accelerating in inter stellar space at a constant rate of 100 m s^-2.
1. Assuming absence of stars in the vicinity, the only gravitational force exerted on astronaut is by the spaceship. 2. But this force is negligible. 3. Hence, once astronaut is out of...
2 Answers 1 views
A person moves towards north with uniform speed of 15 m/s and cover 16 m. After this he moves towards east and covers 6 m and finallt covers 8 m dista
Correct Answer - (i)`30m,53^(@)`,N of E (ii)10 m, (iii)` 5m//s53^(@)`, N of E
2 Answers 1 views
A man travels two-third part of his total distance with speed `v_(1)` and rest one-third part with speed `v_(2)`. Find out the average speed of the ma
Correct Answer - `(3v_(1)v_(2))/(v_(2)+2v_(1))
2 Answers 1 views
A car is moving towards east with a speed of `25 km h^-1`. To the driver of the car, a bus appears to move towards north with a speed of `25 sqrt(3) k
Correct Answer - 50 km/h`(60^(@)N" of "E)`
2 Answers 1 views
A rocket of mass 20000 kg is ejecting the gases at the rate of 50 kg/sec with speed of 20 m/sec in gravity free space. Find the acceleration of rocket
Correct Answer - `a=(10)/(19)m//s^(2)`
2 Answers 1 views
The velocity of rocket with respect to ground is v1 and velocity of gases ejecting from rocket with respect to ground is v2 Then velocity of gases
Correct option is: (B) \(v_2 - v_1\) Then velocity of gases with respect is \(v = v_2 - v_1\)
2 Answers 4 views