C. hydrogen accreted onto a white dwarf from a close companion rapidly fuses to helium, releasing a large amount of energy.
The accreted material, composed mainly of hydrogen, is compacted on the surface of the white dwarf due to the intense gravitational force on that place. As material accumulates, The white dwarf becomes increasingly hot, until it reaches the critical temperature for ignition of nuclear fusion.
Explanation:
It is necessary that the student is always focused on his / her greatest goal in his / her academic life. There are many students who aspire to enter a certain college, or to pursue a particular professional career. So my advice for facing social changes that can have a negative impact on your success as a student is to plan your future goals and ambitions, always be up to date with the demands of society, seek help if necessary and always dedicate yourself to the maximum in your studies.
The piece of iron is brought from a temperature of 100C to a temperature of 22C. In this process, the heat released by this piece of iron is
where
is the mass of the piece of iron,
is the iron's specific heat, and the temperature variation is
. Using these values, the amount of heat released by the iron is
With negative sign because it is amount of heat released. This heat is then trasferred to the water, so the amount of heat absorbed by the water is Q=6.9 kJ.
Answer:
Explanation:
Let's use the conservation of momentum to solve it.
(1)
- The total initial momentum will be:
- The total final momentum will be: , but as they stick together after the collision, v1f = v2f = vf.
So we can rewrite (1), using the above information:
Finally, the magnitude of the velocity of the wreckage of the two cars immediately after the collision is:
I hope it helps you!
200 m to km = 0.2 km
200 m to cm = 20 000 cm
Have a nice day