Hell all me life or death situation

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hell all please help me life or death situation

the starship enterprise wishes to fly to a distant galaxy 85 light years away. at what speed would it have to travel in order that the distance to the galaxy would only be 20 light years? :rolleyes:

a movving particle has a rent mass which is double in its kinetic energy. Find its speed and momentum :!)

you are sitting at rest on your brrom stick one day when a witch flies by at 0.25c the witch says her boomstick is 1.3 m long and yours is 1.5 m long what so you dtermine the length of these two brromsticks to be?
 
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did you already post these problems in the homework section?
DON"T DOUBLE POST PLEASE...THIS IS A SELFISH BEHAVIOR... YOU ARE WASTING OUR TIME TO READ THE SAME POST AGAIN... IF YOU JUST WANT PEOPLE DO HW FOR YOU... HIRE A PRIVATE TUTOR... WE DON"T DO HW FOR PEOPLE...
 
A set of homework problems really isn't a life or death situation. But welcome to physics forum. If you read the FAQ's here, you'll see that there is a forum set aside for homework problems, and that showing your attempts to solve the problems is highly encouraged.
 
I Do Have Atutor He Sux! =)
 
OK, so this has bugged me for a while about the equivalence principle and the black hole information paradox. If black holes "evaporate" via Hawking radiation, then they cannot exist forever. So, from my external perspective, watching the person fall in, they slow down, freeze, and redshift to "nothing," but never cross the event horizon. Does the equivalence principle say my perspective is valid? If it does, is it possible that that person really never crossed the event horizon? The...
ASSUMPTIONS 1. Two identical clocks A and B in the same inertial frame are stationary relative to each other a fixed distance L apart. Time passes at the same rate for both. 2. Both clocks are able to send/receive light signals and to write/read the send/receive times into signals. 3. The speed of light is anisotropic. METHOD 1. At time t[A1] and time t[B1], clock A sends a light signal to clock B. The clock B time is unknown to A. 2. Clock B receives the signal from A at time t[B2] and...
From $$0 = \delta(g^{\alpha\mu}g_{\mu\nu}) = g^{\alpha\mu} \delta g_{\mu\nu} + g_{\mu\nu} \delta g^{\alpha\mu}$$ we have $$g^{\alpha\mu} \delta g_{\mu\nu} = -g_{\mu\nu} \delta g^{\alpha\mu} \,\, . $$ Multiply both sides by ##g_{\alpha\beta}## to get $$\delta g_{\beta\nu} = -g_{\alpha\beta} g_{\mu\nu} \delta g^{\alpha\mu} \qquad(*)$$ (This is Dirac's eq. (26.9) in "GTR".) On the other hand, the variation ##\delta g^{\alpha\mu} = \bar{g}^{\alpha\mu} - g^{\alpha\mu}## should be a tensor...
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