PHYSICS MIDDLE SCHOOL

Which of the following terms is best described as the number of waves that pass a point in one second? A) wave speed B) period C) wavelength D) frequency

Answers

Answer 1
Answer:

The term that best describes how many waves that pass? It's frequency because how many waves are passed by a given point or time is called the waves frequency. I hope this helped you out on your assignment.


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COLLEGE

You wish to produce carbon dioxide for an experiment with plant growth. Vinegar (acetic acid) in a solution will react with chalk (calcium carbonate) to produce carbon dioxide. Your present experimental setup is not producing carbon dioxide quickly enough. What can you do to increase the rate of reaction? A. Warm the solution up.
B. Add less acetic acid to the solution.
C. Add more water to the acetic acid solution.
D. Reduce the volume of solution by pouring some out.

Answers

Answer:

Warm the solution up.

Explanation:

The rate of a reaction is the number of moles of reactants converted or products formed per unit time.

Factors which affect reaction rates include:

I. Nature of the reactants.

II. Concentration of solid and liquid reactants.

III. Pressure of gaseous reactants.

IV. Surface area of the reactants.

V. Temperature of the reaction mixture.

VI. Intensity of light.

VII. Catalyst.

For the above case, warming the solution will increase the temperature of a reaction system. When the temperature is raised, heat energy is supplied to the reactants and:

I. The number of particles with energies equal to or greater than the activation energy of the reaction increases.

II. There is increase in the average speed of the reactant particles due to their greater kinetic energy leading to higher frequency of collisions. This subsequently increases the number of effective collisions, the reaction proceeds at a faster rate and the volume of carbon dioxide produced will increase.

Another easier way is to reduce the amount of water added to the acetic acid so as to increase its concentration, thus, producing more gas.

I believe the correct answer is B
HIGH SCHOOL

Which tool to study space is the LEAST expensive? A) satellite B) space probe C) ground-based telescope D) human space exploration

Answers

C ground based telescope. Think of the cost of fuel in all the other options to launch them into space. A telescope is effective here on Earth.

Answer:

C ground -based telescope

Explanation:

HIGH SCHOOL

As object has a charge of 4.5 c. did it gain or lose electrons

Answers

The object lost electrons because one electron adds a negative to the object. 
COLLEGE

A machinist with normal vision has a near point at 25 cm. This machinist wears +4.25-diopter eyeglasses in order to do very close work. With these eyeglasses, what is the near point of the machinist? Assume that he wears the glasses extremely close to his eyes.

Answers

Answer:

Explanation:

As we know that normal near point is given as

now the power of the lens used is

focal length of the lens will be

now we have

now plug in all values in it

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