PHYSICS HIGH SCHOOL

Nuclear fusion occurs in stars.
a. True
b. False

Answers

Answer 1
Answer:

Answer : The given statement is True.

Explanation -

Nuclear fusion is a thermonuclear reaction in which light stable nuclei combine with each other in order to form a heavy stable nucleus with the release of large amount of energy.

In case of stars, four hydrogen nuclei combine with each other to form a helium nucleus with a release of 26 Mev per cycle.

Thus, nuclear fusion occurs in stars is true statement.


Answer 2
Answer:  Stars are powered by nuclear fusion in their cores, mostly converting hydrogen into helium. The production of new elements via nuclear reactions is called nucleosynthesis. A star's mass determines what other type of nucleosynthesis occurs in its core (or during explosive changes in its life cycle). READ THIS AND YOU WILL UNDERSTAND I THINK IS TRUE 

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In a video game, a flying coconut moves at a constant velocity of 20 meters/second in the positive direction. The coconut hits an obstacle and moves in the opposite direction with a constant velocity of 10 meters/second. What’s the change in velocity of the coconut?

Answers

Answer:

30 negative  is the change in velocty

Explanation:

Answer:-30 m/s

Explanation:

An insect is able to walk across the surface of a pond without sinking because of the A. polarity of the water molecules.
B. process of evaporation.
C. surface tension of the water.
D. adhesion of the insect's feet to the surface of the water.

Answers

C. surface tension of the water.
the answer to that will be D because it has nothing at all to do with the water because either way the water shall stay the same if the animal or insect could or could not be able to walk on water.

What is the most important reason to control the condition of a experiment

Answers

The most important reason to control the conditions of an experiment is to make sure that the environment is affecting the results of the experiment--which would void the study. 

The basic building block of life is

Answers

The basic building block of life is molecules, more specifically macromolecules. There are four different macromolecules which could all be described as the building blocks of life, namely carbohydrates, proteins, nucleic acids and proteins.

Which statement best describes perigee?A. The closet point in the Moon's orbit to Earth
B. The farthest point in the Moon's orbit to Earth
C. The closest point in Earth's orbit of the Sun
D. The Sun's orbit that is closest to the Moon

Answers

Answer:

A. The closest point in the Moon's orbit to Earth

Explanation:

The perigee is defined as the closest point in the orbit of an object (such as a satellite) from the centre of the Earth. In this case, the Earth's satellite is the Moon, so the perigee is defined as the closest point in the Moon's orbit to Earth. so option A is the correct one.

Let's see instead the names of the other options:

B. The farthest point in the Moon's orbit to Earth  --> this point is called apogee

C. The closest point in Earth's orbit of the Sun  --> this point is called perihelion

D. The Sun's orbit that is closest to the Moon --> this point has no specific name
A. The closet point in the Moon's orbit to Earth

Hope I helped:P

What force is needed to give a 0.25-kg arrow an acceleration of 196 m/s2? A. 0.25 N B. 49 N C. 196 N D. 748 N

Answers

The answer is B. 49 N

Force is equal to the mass of that object multiplied by itsacceleration:

F = m × a 
The unit of force is N = kg * m/s².

It is given:
m = 0.25 kg
a = 196 m/s²

F = m × a = 0.25 kg × 196 m/s² = 49 N

B.49 N is the ANSWER! I took the test on k12 and it was right
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