As measured in earth's frame of reference, two planets are 384000 km apart. a spaceship flies from one planet to the other with a constant velocity, and the clocks on the ship show that the trip lasts only 1.02 s. how fast is the ship traveling?

Explanation:

   Time dilation formula is as follows

T₁ is time observed by stationary observer and T is time recorded by moving clock.

Given T = 1.02 and

T₁ = 3.84 X10⁸ / v [ Let v be velocity of spaceship as observed by observer on earth ]

Putting these values in the time dilation formula

3.84 x 10⁸ / v = \frac{1.02}{\sqrt{1-\frac{v^2}{9\times10^{16}} } }[/tex]

v = 2.345 x 10⁸ ms⁻¹

the device is called “ rocket engine”

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000