A diagram that shows the Earth at the center of the solar system is known as a what?1. geocentric model.
2. heliocentric model.
3. universe model.
4. Earth-moon-sun model.

Answers

Answer 1

Answer: The correct answer for the question that is being presented above is this one: "1. geocentric model." A diagram that shows the Earth at the center of the solar system is known as the geocentric model. It is also known as the Ptolemaic system is a superseded description of the universe, where the Earth is at the center of all the celestial bodies.

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A train whistle is at a higher pitch (note) as it approaches you and then drops to a lower pitch as it moves away. This effect is called?

Answers

the effect is called The doppler effect

The effect being mentioned is called "The doppler effect".

A baby pushes a toy across the floor with a force of 5 newtons

Answers

The baby has nice coordination and fine motor control.

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Using a candle as the object on an optical bench set up as shown in the diagram. What two measurements must be taken in order to find the focal length of the lens?

Answers

Answer:

When you view the candle with a lens, located at a distance D of the candle, you will see an inverted image of the candle, and this image of the candle may be a little distorted. At this point you need to change the distance between the observer (you) and the lens.

When the image of the candle is nitid (this means that the image is focalized)

You need to measure the distance between the lens and the observer. suppose that this distance is d.

(this process is usually written as: If the actual height of the candle is H, you need to record the distance where the image of the candle also has a height H)

Now, the focal point of the lens will be obtained with the lens maker equation:

1/D + 1/d = 1/f

where f is the focal point of the lens.

What is the gravitational force acting on a 70.0 kg object standing on the earth's surface ?

Answers

g( gravitational acceleration)=-9.81 m/s^2
m(mass) = 70.0 kg

According to Newton's second law of motion:

"F=ma"

Force is equal mass per acceleration therefore

W=mg
This is because weigth is the force of gravity acting in a body and "a" is replaced by "g" because "g"
is gravitational acceleration

Therefore:

W= mg
W= (70.0 kg) (-9.81m/s^2)
W= -686.7 N

* The "N" means newton which is (kg* m/s^2)

Final answer:

The gravitational force acting on a 70.0 kg object on Earth is calculated using the formula w=mg and is equal to 686 N.

Explanation:

The gravitational force acting on a 70.0 kg object standing on the earth's surface can be calculated using the formula for weight (which is essentially the gravitational force on the object): w = mg, where m is the mass of the object and g is the acceleration due to gravity. On Earth, g is approximately 9.8 m/s².

Therefore, the gravitational force (weight) acting on this object can be calculated as follows: w = mg = (70.0 kg)(9.8 m/s²) = 686 N. Thus, the gravitational force on this 70.0 kg object standing on the earth's surface is 686 Newtons. It's important to understand that this force will vary if the object is moved to a location where g is different, like on the moon.

Learn more about Gravitational Force here:

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On a spending spree in Malaysia, you buy an ox with a weight of 28.9 piculs in the local unit of weights: 1 picul = 100 gins, 1 gin = 16 tahils, 1 tahil = 10 chees, and 1 chee = 10 hoons. The weight of 1 hoon corresponds to a mass of 0.3779 g. When you arrange to ship the ox home to your astonished family, how much mass in kilograms must you declare on the shipping manifest? (Hint: Set up multiple chain-link conversions.)

Answers

Answer:

1747.41 kg

Explanation:

If 1 piculs = 100 gins,

Then 28.9 piculs = (28.9 × 100) gins = 2890 gins.

Also,

If 1 gin = 16 tahils

then 2890 gins =( 16 × 2890 ) = 46240 tahils

Also,

If 1 tahil = 10 chees,

Then 46240 tahils = 46240 × 10 chees = 462400 chees.

Also,

If 1 chee = 10 hoons

Then 462400 chees =( 10 × 462400) hoons = 4624000 hoons.

Also,

If 1 hoon = 0.3779 g,

Then 4624000 hoons = 0.3779 × 4624000 = 1747409.6 g.

The mass in kg that i will declare in the shipping manifest = (1747409.6/100 )kg = 1747.41 kg

Which of the following group 7A elements is the most reactive?

Answers

Among the elements in group 7A, the most reactive would be Fluorine. Fluorine is a major component of toothpaste, what we use to brush and clean our teeth with. It is so reactive that it cannot be contained in glass.

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