- #1
charlie05
- 128
- 6
Hello everybody,
I am sorry, but I need your help with my physics homework. I will be very happy if somebody could help me.
1. Homework Statement
Task: The ship passed through the wormhole. The “new” temperature of cosmic microwave background is T = 0,3 K. The curvature of the universe is, same as before, negligible and the "old" Hubble’s parameter was H0 = (67,7±0,5) km · s−1· Mpc−1. The "new" value of Hubble’s parameter is H = (57 ± 4) km · s−1 · Mpc−1. We suppose that the ship is still in our universe.
Hint: ρcrit = 3H2 / 8πG; eHt
a) Does the ship move to the past or to the future?
b) Does the ship move also in place? And for how far?
c) Specify the ratio of space distance (against the present).
d) Verify by calculation that the ship is really still in our universe.
e) For how many years the ship "travel"?
a) I think that ship moved to the future, because “new” temperature of cosmic microwave background is T = 0,3 K while now this temperature is about 2,7 K. The whole universe is getting colder so for that reason I think that ship moved to the future.
In other tasks I don’t know how to solve. I think that in one task I will compare the critical density which I calculate by formula in hint.
I want to thank you in advance for your help and willingness!
I am sorry, but I need your help with my physics homework. I will be very happy if somebody could help me.
1. Homework Statement
Task: The ship passed through the wormhole. The “new” temperature of cosmic microwave background is T = 0,3 K. The curvature of the universe is, same as before, negligible and the "old" Hubble’s parameter was H0 = (67,7±0,5) km · s−1· Mpc−1. The "new" value of Hubble’s parameter is H = (57 ± 4) km · s−1 · Mpc−1. We suppose that the ship is still in our universe.
Hint: ρcrit = 3H2 / 8πG; eHt
Homework Equations
a) Does the ship move to the past or to the future?
b) Does the ship move also in place? And for how far?
c) Specify the ratio of space distance (against the present).
d) Verify by calculation that the ship is really still in our universe.
e) For how many years the ship "travel"?
The Attempt at a Solution
a) I think that ship moved to the future, because “new” temperature of cosmic microwave background is T = 0,3 K while now this temperature is about 2,7 K. The whole universe is getting colder so for that reason I think that ship moved to the future.
In other tasks I don’t know how to solve. I think that in one task I will compare the critical density which I calculate by formula in hint.
I want to thank you in advance for your help and willingness!