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dem82 [27]
2 years ago
9

Scientific theories are explanations for scientific phenomena that can be changed when and if new information is found to suppor

t or refute the explanation. Which of the following statements provides an example of a scientific theory?. a.. An object at rest will remain at rest unless acted on by an outside force.. b.. Species evolve by passing on advantageous hereditary traits.
Physics
1 answer:
MatroZZZ [7]2 years ago
3 0
"An object at rest will remain at rest unless acted on by an outside force" is the one statement among the following choices given in the question that provides an example of a scientific theory. The correct option among the two options that are given in the question is the first option or option "a". I hope the answer helped you.
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An air conditioner operating between 93°F and 70°F is rated at 4000 Btu/h cooling capacity. Its coefficient of performance is 27
lana [24]

Answer:P_{in}=0.25\ Hp

Explanation:

Given

Operating temperatures are

T_L=70^{\circ}F\approx 294.261\ K

T_H=93^{\circ}F\approx 307\ K

COP is 27\% of Carnot refrigerator

COP_{carnot}=\dfrac{T_L}{T_H-T_L}

COP_{carnot}=\dfrac{294.261}{307-294.261}

COP_{carnot}=\dfrac{294.261}{12.74}

COP_{carnot}=23.09\approx 23.1

actual COP=0.27 \times COP_{carnot}

COP_{actual}=6.237

Also, COP=\dfrac{\text{Desired effect}}{\text{Power in}}

6.237=\frac{4000}{P_{in}}

P_{in}=\frac{4000}{6.237}=641.33\ Btu/h

P_{in}=0.25\ Hp

6 0
2 years ago
What is your displacement if you travel 5 miles north to the store
kumpel [21]

Answer:

5miles North

Explanation:

The displacement to the store is 5miles northward.

Displacement is the distance traveled in a specific direction. Displacement is a vector quantity.

A vector has both magnitude and direction.

The magnitude is the amount of that quantity

The direction is its orientation from a reference.

 Therefore, the displacement is 5miles north

3 0
2 years ago
What is the voltage of a computer with 30 Ω of resistance and 15 amps of current?
Kryger [21]

Answer:

120 V

Explanation:

5 0
2 years ago
In order to open the clam it catches, a seagull will drop the clam repeatedly onto a hard surface from high in the air until the
Vedmedyk [2.9K]

Answer:

2.2 s

Explanation:

Hi!

Let's consider the origin of the coordinate system at the ground, and consider that the clam starts with zero velocity, the equation of motion of the clam is given by

x(t) = 23.1 m - \frac{1}{2}(9.8 m/s^2) t^2

We are looking for a time t for which x(t) = 0

0 = 23.1 m - (4.9 m/s^2) t^2

Solving for t:

t = \sqrt{\frac{23.1}{4.9}} s = 2.17124 s

Rounding at the first decimal:

t = 2.2 s

4 0
2 years ago
Which of the following compounds is not likely to have ionic bonds? Question 5 options: LiF NaCl CH4 MgF2
Harrizon [31]

Answer:

CH4

Explanation:

CH4 is joined together by a covalent bond, aka a bond between two non-metals. Non-metals are found on the right side of the periodic table and include Carbon (C) and Hydrogen. Although Hydrogen is technically on the left side of the table, it has the characteristics of a non-metal. Futhermore, Ionic bonds generally are between an element on the right joined with an element on the left. This is because ionic bonds want charges that will cancel out to create a neutral molecule.

example: LiF

Li→ Li+

F→F-

(Li+)+(F-)=charges cancel out.

7 0
2 years ago
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