3 years ago

I need help on both questions

Physics

2 answers:

saw5 [17]3 years ago

6 0

20 until 40 not moving
other with out 20 until 40 is moving

iris [78.8K]3 years ago

3 0

It's not in motion when the line straight and flat . there's #9

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Answer:

0.859375c

31.03 seconds

Explanation:

v' = Velocity of my ship = 0.4 c

u = Velocity of rocket = 0.7 c

c = Speed of light = $3\times 10^8\ m/s$

s = Distance between my ship and enemy ship = $8\times 10^6\ km$

Relativistic addition of speed is given by

$v=\dfrac{v'+u}{1+\dfrac{uv'}{c^2}}\\\Rightarrow v=\dfrac{0.7+0.4}{1+\dfrac{0.7c\times 0.4c}{c^2}}\\\Rightarrow v=0.859375\ c$

The speed of the missile is 0.859375c

Time is given by

$t=\dfrac{s}{v}\\\Rightarrow t=\dfrac{8\times 10^9}{0.859375\times 3\times 10^8}\\\Rightarrow t=31.03\ s$

It will take 31.03 seconds to reach me.

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