snowmonkey12
Jan25-11, 07:12 AM
hi guys many thanks in advance for any help, im revising for an exam and got stuck on this question:
"A supernova of energy 10^44 J explodes in interstellar matter of density n0 = 10^6
m^−3 and pressure Pi = 3*10^−14 N m^−2. Estimate how much gas (mass) can
be disturbed by this supernova. The expansion happens at a velocity Vs = 4 km s^−1."
The answer sheet says the following:
"This is in the snowplough phase. Using the snowplough equations with V0 = 250 km s−1 and R0 = 7*10^17 m gives a time t = 1.7*10^14 s, radius R = 2.8*10^18 m and a mass affected M = 10^5 M⊙."
So basically i have no idea what equation/equations have been used or where the values for the variables. thanks again
"A supernova of energy 10^44 J explodes in interstellar matter of density n0 = 10^6
m^−3 and pressure Pi = 3*10^−14 N m^−2. Estimate how much gas (mass) can
be disturbed by this supernova. The expansion happens at a velocity Vs = 4 km s^−1."
The answer sheet says the following:
"This is in the snowplough phase. Using the snowplough equations with V0 = 250 km s−1 and R0 = 7*10^17 m gives a time t = 1.7*10^14 s, radius R = 2.8*10^18 m and a mass affected M = 10^5 M⊙."
So basically i have no idea what equation/equations have been used or where the values for the variables. thanks again