PHYSICS HIGH SCHOOL

In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a _____ reaction. The opposite process is a _____ reaction.options for both of the blanks are
A) combustion
B) decomposition
C) replacement
or D) synthesis

Answers

Answer 1
Answer: In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a "Decomposition reaction". The opposite process is a "Synthesis" reaction.

In short, fill your blanks as:
1st blank  → Option B
2nd blank → Option D

Hope this helps!
Answer 2
Answer:

Answer : The correct option for 1st blank is Decomposition and for 2nd blank is Synthesis.

Explanation :

  • Decomposition reaction : This reaction occurs when one bigger molecule decomposes into two or more smaller molecules.
  • Synthesis reaction : This reaction occurs when two or more smaller reactants combine to form a single large product.
  • Combustion reaction : This reaction occurs when a hydrocarbon molecule react with the oxygen molecule to produce carbon dioxide and water.
  • Replacement reaction : This reaction occurs when the more reactive element replaces the less reactive element in a compound.

When potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen that means one bigger molecule decomposes into two or more smaller molecules. So, this an example of a decomposition reaction.

And in the opposite process that means potassium oxide, nitrogen, and oxygen are combined to form potassium nitrate means two or more small reactant combine to form a single large product. So, this an example of synthesis reaction.

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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.

Longitudinal waves compress the medium they travel though. One example of a longitudinal wave is a

Answers

Answer: Waves in compressed string

Explanation:

Longitudinal waves are waves in which the vibration of the medium is going parallel to the direction of the waves produced by the medium.

Longitudinal wave can occur in compressed string. A compressed string displaced horizontally will transmit wave in the same horizontal direction. That's why they are longitudinal waves.

Answer:

It is sound waves

(I did USAtestprep)

Explanation:

A ball rolls down an incline with an acceleration of 10 cm/s^2. If it starts with an initial velocity of 0 cm/s and has a velocy of 50 cm/s when it reaches the bottom of the ramp, how long is the ramp?

Answers

Given a = 10 cm/s²
          u = 0 cm/s
          v = 50 cm/s
we know that 
         v²=u²+2aS
        2500=2×10×S
        2500÷20 = S
        S= 125 cm
The ramp is 125 cm

Final answer:

The time for the ball to reach the bottom of the ramp is 5 seconds. Using this time value, the acceleration, and the initial velocity, you can calculate the length of the ramp, which is found to be 125 cm.

Explanation:

The question involves the physics principles of kinematics, specifically the concept of acceleration. Given that the initial velocity is 0 cm/s, the final velocity is 50 cm/s, and the acceleration is 10 cm/s^2, you can find the time it took for the ball to reach the bottom using the formula vf=vi+at (Final velocity = initial velocity + acceleration * time). Substituting the given values, you get the equation 50cm/s = 0cm/s + 10cm/s^2 * time, simplifying which gives time = 5 seconds.

To find the length of the ramp, you can use another kinematic equation, d = vit + 0.5at^2 (Distance = initial velocity * time + 0.5 * acceleration * time^2). Substituting the values we know, (initial velocity = 0, acceleration = 10 cm/s^2, time = 5 s), the equation simplifies to d = 0*5 + 0.5*10*5^2 = 0 + 0.5*10*25 = 125 cm. Therefore, the length of the incline or ramp is 125 cm.

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Alejandra weighs 225 newtons. how much work does she do against gravity when she climbs to a ledge at the top of a 15 meter climbing wall

Answers

Work=Fd
=Fgd
= 225N * 15M
= 3375 Nm

Final answer:

Alejandra does 3375 Joules of work against gravity when she climbs to the ledge at the top of the climbing wall.

Explanation:

In order to calculate the work done against gravity, we can use the formula: Work = Force x Distance. The force of gravity can be calculated using the equation: Force = mass x acceleration due to gravity. Given that Alejandra weighs 225 newtons and the distance she climbs is 15 meters, we can plug these values into the formula to find the work done:

Work= (225 N) x (15 m) = 3375 Joules

Therefore, Alejandra does 3375 Joules of work against gravity when she climbs to the ledge at the top of the climbing wall.

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What is an example of Deceleration?

Answers

That's a word often used to mean "slowing down". An example is what happens
when the brake is applied in a moving car.

But 'deceleration' is a very unofficial, unscientific word.  If the forward speed
is decreasing, then a much more useful concept is "negative acceleration".
When the body starts moving with a slower speed than the initial speed and it slows down continuously, the this is called deceleration. Examples of deceleration - 

When a ball is thrown upwards, its speed goes on decreasing as its height increases.
When a car applies brakes.

The process by which water diffuses from a region of greater concentration to a region of lesser concentration is called

Answers

Answer:

osmosis is the correct answer.

Explanation:

The process by which water diffuses from a region of greater concentration to a region of lesser concentration is called osmosis.

Osmosis is a process in which solvent moves through a selective semipermeable membrane into a more concentrated region.

There are three types of Osmotic solutions

  • isotonic solution where the osmotic pressure is the same across the membrane.
  • hypotonic solution where the osmotic pressure is lower compared to another solution.
  • hypertonic solution where the solute concentration is higher as compared to the other solution

Osmosis is the process by which water diffuses from a region of greater concentration to a region of lesser concentration
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