Can Someone Answer The First question for me? About which would require the grea

Question

Can Someone Answer The First question for me? About which would require the greater Energy, And for 2nd Question Part a i got answer as 2.01*10^6ms-2, So can you also check that for me? Please Explain Whatever You Do. It would help

Thank You

which would require the greater change in the Earth's orbital speed (30 km/s); slowing it down so that it would crash into the Sun, or speeding it up so that it would escape the Sun? Which would require the greater energy? ARBOR SCIENTIF Q2 [30 mins] When the Sun exhausts its nuclear fuel it will eventually become a white dwarf star. In this state the Sun will now have a mass that is 90% of its current mass, and contracted to the size of the Earth. Calculate: a) The surface free-fall acceleration of the white dwarf Sun.

Explanation / Answer

According to the given problem,

1.) Answer: Slowing it down so that it would crash into the Sun would require a loss of 30 km/s

Reason: In order to crash into the sun, the Earth's orbital speed of 30 km/s would have to be reduced to zero. This is a change of 30 km/s.

In order to escape the Sun, the Earth's orbital speed would have to be increased to 42.5 km/s, a change of 12.5 km/s.

So a greater change in speed is required to slow the Earth for a Sun crash than to speed it for solar escape.

2.) free fall acceleration = [(6.67*10--11)*(1.79*1030)]/(6.957*106)2

g` = 2.466*106 m/s2

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