PHYSICS HIGH SCHOOL

At which point in the life cycle of a star does nuclear fusion begin?A. Black hole
B. Main sequence
C. Nebula
D. Protostar

Answers

Answer 1
Answer: I would say B : main sequence is the answer . this is the answer i believe because the star will increase in size and than shine brightly and when it's done , it will get smaller turning into  nebula , eventually exploding sometime around the last stage , but not the last stage of b , c, or d

i really hope that this helps you a lot.
Answer 2
Answer:

Final answer:

The correct answer is D. Protostar.

Nuclear fusion in a star's lifecycle begins during the protostar stage. This is when the temperature and pressure of the protostar ignite nuclear fusion, transitioning into a main sequence star.

Explanation:

In the life cycle of a star, nuclear fusion begins when the star has reached the protostar stage. The initial stage in the development of a star is the nebula, which is a cloud of dust and gas. Over time, the nebula's materials collapse under gravity to form a hot core known as a protostar.

When the protostar's temperature and pressure rises, it triggers nuclear fusion and the star begins turning hydrogen into helium.

This marks the transition from a protostar to a main sequence star, which is the stage of stable nuclear fusion.

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Approximately how long does it take the Sun to orbit the center of the Milky Way Galaxy? A) 2 million years B) 20,000 years C) 2 billion years D) 200,000 years E) 200 million years

Answers

Answer: THE OPTION IS E(ABOUT 200 MILLONS YEARS

Explanation:

The diagram shows the electric field in the vicinity of a charge. At which point is the electric field strongest? 1) W 2) X 3)Y 4)Z

Answers

The strength of electric field depends on the distance from the charge and also the distance between the electric field lines. If the electric field lines are closer to each other, the electric field is strong there. closer the electric field lines to each other in a region, stronger is the electric field. Electric field lines are closest in region Y. hence the electric field is strongest in region Y.

So correct choice is

3) Y

Final answer:

The electric field strength at a given point is determined by how densely the lines on a diagram represent it. The denser the lines, the stronger the field. Therefore, the field strength is strongest where the lines are most closely packed.

Explanation:

The electric field strength at a given point in space is determined by how close the point is to the charge source and the quantity of the charge. In diagrams, the electric field strength is represented by the density of the lines - in other words, the area with the most lines is where the electric field strength is strongest. Based on this principle, if we are to choose between points W, X, Y, and Z, the electric field is strongest at the point where the lines are most densely packed.

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a stone falls from a ledge and takes 8 seconds to hit the ground. The stone has an original velocity of 0 m/s. How tall is the ledge

Answers

The height of a falling object, h, in terms of the seconds passed, t, is
h = 0.5(-9.8t^2) + v_0t + h_0
0 = -4.9(8)^2 + 0 + h_0
h_0 = 64 * 4.9
= 313.6 meters

Here's a formula that tells the distance covered by an
accelerating object starting from rest.  The formula is
very useful, and it's simple enough to memorize:

       Distance = (1/2) (acceleration) (time squared) .

If the object is falling, then the acceleration is gravity, 9.8 m/s²,
and the distance is

                         (4.9) (time²) .

In this question,

                     D  =  (4.9) (8²)

                         =  (4.9 x 64)  =  313.6 meters.

Coupla comments:

-- This calculation ignores air resistance. 
    We kind of ALWAYS do that, otherwise
    the calculation would be very complicated,
    and would need a lot of other numbers
    that we don't know, like the size and shape
    of the falling object, and the density of the air.

--  This is a very big building ... about 1,029 feet.
     In New York City, the Chrysler building and
     the New York Times building are both only
     15 feet taller than that.
    

Select all types of energy. a. sound. b. heat. c. touch. d. taste. e. electrical

Answers

Answer:

A,E,B

Explanation: touch and taste are just senses.

Acceleration occurs whenever an ___________________ force acts on an object.

Answers

Acceleration occurs whenever the forces on an object are unbalanced.

It's the group of forces on the object that's either balanced or unbalanced.
There's no such thing as "an unbalanced force".
Acceleration is known to occur whenever an unbalanced force acts on an object.

Diffusion is the net movement of particles from a region of higher concentration to a region of low concentration, due to their kinetic energy, down a concentration gradient. A)True B)False

Answers

Answer:

False

Explanation:

NOT due to their kinetic energy
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