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2 years ago

Lesson 2 History of Physical Science

Physics

1 answer:

kolezko [41]2 years ago

4 0

The prompt above requires an explanatory essay. The focus of an explanatory essay is to give clarity to a concept. See the sample below.

<h3>What is the explanatory essay as per the prompt above?</h3>

From history, it is clear that Science builds on itself. For avoidance of doubt, this means that improvements in science are incremental with each improvement feeding off the last.

From the lesson we have examples of this phenomena such as that of Galileo. Recall that the text indicates that He improved the telescope; and while carrying out the same research that his predecessor Copernicus had done in relation to the stars and planets, Galileo used math to justify his position.

It is also on record that Johannes Kepler who lived in the same period as Galileo took interest in Astronomy. In this case, science built on itself because, Kepler's work served as the foundation for Sir Isaac Newton's work. This is also another example of how science builds on itself.

From the above textual evidence, it is given beyond reasonable double that science indeed builds on itself with the discovery of each generation serving as the foundation for the advancement of the next.

Learn more about Explanatory Essays at;
brainly.com/question/26984401
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A steel ball and a wooden ball of the same diameter are released together from the top of a tower. In the absence of air resista

ella [17]

Answer:

False

Explanation:

The steel ball and the wooden ball do not have the same force acting on them because their masses are different. But, they have the same acceleration which is the acceleration due to gravity g = 9.8 m/s².

Using the equation of motion under freefall, s = ut +1/2gt². Since u = 0,

s = 1/2gt² ⇒ t = √(2s/g)

Since. s = height is the same for both objects, they land at the same time neglecting air resistance.

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3 years ago

In both a dry cell and a wet cell battery, what causes the production of an electrical current.

koban [17]

Answer:

a. chemical reaction

Explanation:

In both a dry and wet cell battery, electric currents are produced through chemical reactions.

Both cells are together called electrochemical cells.

In these cells, chemical reactions produce an electric current.
They are devices that converts chemical energy into electrical energy
The reactions here are spontaneous redox reactions.
This causes the current to flow on their own in the circuit.

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3 years ago

Near the surface of the earth, objects in free fall (but not terminal velocity) experience

Mice21 [21]

D. Constant Acceleration

7 0

3 years ago

A ball is kicked from the ground into the air at a velocity of 3 m/s at an angle 35° above the horizontal and hits the ground so

Dennis_Churaev [7]

Answer:2.45 m/s

Explanation:

Given

Launch velocity $(u)=3 m/s$

launch angle $=35^{\circ}$

as the vertical velocity first decreasing to zero and then increases to original value so its avg is zero .

$v_{avg}=\frac{displacement}{time}$

$v_{avg}=\frac{Range}{time}$

$v_{avg}=\frac{u\cos \theta \times t}{t}$

thus $v_{avg}=\frac{3\cos 35\times t}{t}$

$v_{avg}=3\cos 35=2.45 m/s$

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3 years ago

Four identical metallic spheres with charges of +8.2 µC, +9.0 µC, −7.8 µC, and −8.8 µC are placed on a piece of paper. The paper

tigry1 [53]

Answer:

a) 0.15 μC b) 9.4*10¹¹ electrons.

Explanation:

As the total charge must be conserved, the total charge on the spheres, after being brought to contact each other, and then separated, must be equal to the total charge present in the spheres prior to be put in contact:

Q = +8.2μC +9.0 μC +(-7.8 μC) + (-8.8 μC) = +0.6 μC

As the spheres are assumed perfect conductors, as they are identical, once in contact each other, the excess charge spreads evenly on each sphere, so the final charge, on each of them, is just the fourth part of the total charge:

Qs = Qt/4 = 0.6 μC / 4 = 0.15 μC.

b) As the charge has a positive sign, this means that each sphere has a defect of electrons.

In order to know how many electrons are absent in each sphere, we can divide the total charge by the charge of one electron, which is the elementary charge e, as follows:

$N =\frac{0.15e-6C}{1.6e-19C} = 9.4e11 electrons$

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3 years ago