Answer:
The answer is A
Explanation:
Someone shouting to you from across a room
Answer:
1. An increase in the core temperature
2. A decrease in the core radius.
Explanation:
The sun is a Main Sequence star. A Main Sequence star is powered by fusing hydrogen into Helium within its core.
For this fusion to take place, a temperature of at least 10 million Kelvin is required, beyond this point, the fusion rate is directly related to the core temperature. If the temperature increases, the fusion rate will greatly increase.
Something similar happens if the core reduces its radius. This can happen at the end of the star's lifetime, shortly before it becomes a red giant. Once the hydrogen is depleted, the core will start to shrink because the force of gravity, and as it gets smaller, gets more compressed, and its temperature increases. The outer layers of remaining Hydrogen that were outside the core now begin to heat up, and as the core continues to shrink, the star gets hot enough to begin the fusion process again, and the fusion rate can even be higher than it was during the first phase of the star, as the star becomes a Red Giant.
Answer:
2.15 m
Explanation:
Newton's Law of Universal Gravitation:
is the gravitational force of attraction
is the universal gravitational constant
and
are the two masses of the two objects
is the distance between the centers of the two objects.
List the known values:
Plug these values into the equation:
Notice that the units
,
, and
cancel out. We are left with the unit
for radius r.
Get rid of the units to make the problem easier to read.
Multiply the masses together.
Multiply the gravitational constant and the masses together.
Solve for
by dividing both sides by 3.47 * 10^(-8) and moving
to the left.
Take the square root of both sides.
The students are sitting about 2.15 m apart from each other.
Answer: 1.65
Explanation: Snell's law says that index of refraction of the first material times sine theta one equals index of refraction of the second material, which we don't know, multiplied by sine theta two, . So, we'll solve this for N two by dividing both sides by sine theta two. So, N two is N one sine theta one over sine theta two . So, that's 1.33 index of refraction of water times sine of 45.7degrees incidence angle divided by sine of 30.5 degrees angle of refraction, giving us 1.65.
The formula for snell's law is N1*sintheta1=N2*sinetheta2
Nuclear energy has practically no harmful emission (unless you consider water vapour to be bad).