Assume that all four H-R diagrams below represent a star in different stages of its life, after it starts to fuse hydrogen in its core. Rank the HR diagrams based on when each stage occurs, from first to last.
Answers
Answer and explanation;
-The diagram at the left represents the Sun (or any other one-solar-mass star) as a hydrogen-burning main-sequence star, with spectral type G and one solar luminosity. The next diagram shows the Sun after it has exhausted its core hydrogen and left the main sequence, making it a sub-giant with energy generated by hydrogen burning in a shell around an inert helium core.
-The third diagram shows the Sun a little later; its energy source is still hydrogen shell burning, but at this point it has expanded in size so much that it is a red giant. The final diagram (far right) shows the white dwarf corpse of a one-solar-mass star; it is hot because it is the exposed core of the dead star, but dim because it is small in size.
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Rank in order, from largest to smallest, the electric field strengths E1, E2, E3, and E4 at the four labeled points in (figure 1). a) E1 > E2 > E3 > E4 b) E4 > E3 > E2 > E1 c) E2 > E1 > E4 > E3 d) E3 > E2 > E1 > E4
B) The alpha particle will reverse its direction.
C) The alpha particle will be deflected in a curve path.
Eliminate
D) The alpha particle will continue to travel in a straight line.
Answers
Answer:
C. The alpha particle will be deflected in a curve path.
Then the alpha particle will be deflected by a magnetic field.
B) The magnitude of gravitational forces is greater than the magnitude of electromagnetic forces.
C) The magnitude of electromagnetic forces is always equal to the magnitude of reaction forces.
D) The magnitude of gravitational forces is always equal to the magnitude of electromagnetic forces.
Answers
Answer:
The magnitude of electromagnetic forces is greater than the magnitude of gravitational forces.
Explanation:
There are four fundamental forces in nature. These are as follows :
(1) Gravitational force
(2) Electromagnetic force
(3) Weak force
(4) Strong force
Gravitational force is the weakest force among all the fundamental forces. The gravitational force exists between masses present in the universe while the electromagnetic force exist between charged particles. The magnitude of gravitational force is weaker than the electromagnetic force. It is about times more than gravitational force.
Hence, the correct statement about forces in the solar system is (A).
Answers
Answer:
If sound waves of the same energy were passed through a block of wood and a block of steel, which is more dense than the wood, the molecules of the steel would vibrate at a slower rate. Sound moves faster through denser air because the molecules are closer together in dense air and sound can be more easily passed on.
Explanation:
a. carbon
c. mercury
d. nitrogen
b. oxygen
Answers
-oxygen
-nitrogen
How many electrons pass the point in this time?
Answers
A = 0.12 C/s ... [b/c 1 A = 1 C/s]
t = 25 s
I = Q/t
Q = It
Q = 0.12 * 25 = 3 C
so 3C of charge passes the point during the
25 s interval
B. A generator
C. Mechanical energy
D. Electromagnetic energy