Answer:
A star with 15 solar masses is too big to be a main-sequence star.
Answer:
1.2 102j
Explanation:
because it is the most important for me
Answer:

Explanation:
From the question we are told that:
Coefficient of kinetic friction 
Vertical Mass 
Horizontal mass
Generally the equation for kinetic force
is mathematically given by

Generally the equation for T is mathematically given by

For 

Therefore substituting


Answer:
7.8x10^10
Explanation:
divide that value by 10000000000
and you get 7.8
P=4800kgm/s
As
p=mΔv
where p is momentum, m is mass and v is velocity
Given values is
m =1200kg
Δv= 17m/s-13m/s=4m/s
Now
p=mΔv
p=(1200kg)*(4m/s)
p=4800kgm/s