PHYSICS HIGH SCHOOL

Which force is always pulling but never pushes and is directly influenced by mass

Answers

Answer 1
Answer:

Answer: I know when it comes to magnetic objects the magnet always pulls not push.
Answer 2
Answer:

Answer:

i believe it is gravity

Explanation:

the gravitational force is a force that attracts any two objects with mass. it pulls things together does not pushes them.

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A rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the thrower at 5 m/s. Which statementcorrectly describes the momentum of the rubber ball?a. Its magnitude increased and its direction changed.b. Its magnitude increased but its direction remained the same.c. Its magnitude remained the same but its direction changed.d. Its magnitude and its direction both remained the same.

A train deports from a station at a constant acceleration of 5 m/s what is the speed of the train at the end of 20 seconds ?

Answers

You multiply the length of time by the speed, to get 100m/s

Which atomic number is the threshold value below which fusion may occur?

Answers

Answer:

The atomic number 26(iron) is the threshold value below which the fusion might occur.

Explanation:

Nuclear fusion is a reaction in which two or more nuclei are combined to form one or more different atomic nuclei and subatomic particles.

Energy released in a fusion reaction is because of a key feature of nuclear matter called the binding energy which is a measure of the efficiency with which its constituent nucleons are bound together.

As we go up in atomic number, the energy released per nuclei goes down until it hits a minimum which is for atomic number 26 (iron) and fusion is not possible.

Answer:

Atomic no. 26 i.e. Iron

Explanation:

Nuclear Fusion is a process in which two or more nucleus are fused(combined) together to make heavier nucleus and release a lot of energy and other subatomic particles in the process. Considerable amount of energy is required to fuse the nucleus together but the output energy is much more than the input energy. It becomes an exothermic process.

In case of heavier nuclei, this doesn't hold true as the process becomes endothermic. That means the output energy will be way lesser than the input energy given to fuse the nucleus. This happens for elements of atomic no. 26 or above. Even in stars we can find element till atomic no. 26 as they can be formed by fusion. When a star reaches to iron fusion stage that is the end of it and it explodes into a supernova.

A mole or fraction of a mole represents a _______number of atoms or molecules.a. specific
b. nonspecific

Can I get some help matching these from the left to the right?

1) increased surface area concentration decreases around solute
2) like polarity increases rate rate proportional to K.E.
3) temperature matching solvent and solute
4) stirring finely divided solute

Answers

A mole or fraction of a mole represents a nonspecific number of atoms or molecules. The answer is letter A.

The correct answer is number 2, like polarity increases rate rate proportional to K.E. 

The temperature at which the particles of a substance would have no kinetic energy isa. 2,273 k.
b. 0 k.
c. 0 ºc.
d. 273 k. answers

Answers

B) 0K

0K, also called absolute zero, is the lowest possible temperature theoretically possible (not yet reached!). It is believed that at this temperature, motion of all particles slows, and possibly stops. Also, remember that as the temperature decreases, the motion of particles also decreases. 

According to the periodic table, the average atomic mass of helium is A) 2 amu. B) 2.0026 amu. C) 4.0026 amu. D) 6.0026 amu.

Answers

Answer:

C) 4.0026 amu

Explanation:

Helium (He) is the 2nd element on the Periodic Table.

It's neutral atom has 2 protons and 2 electrons.

It is in the 1st period and the 18th row.

It is also a Noble gas.

Y = -2x + 5 and 2x + y = -7​

Answers

Answer:

not true

Explanation:

substitution is convenient here

2x + (-2x + 5) = -7

2x - 2x - 5 = -7

-5 = -7

not an equality, thus the lines are parallel and have no intersection
This is not an equality
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