Can someone please help me with science.

Answer:

Without any external forces a moving object will continue to move in a straight line. The gravitational force between the two objects will provide the centripetal force to keep the objects moving around one another.

1. satellite in orbit around the earth             (motion of earth is negligible)

2. moon in orbit around the earth     (center of motion several thousand miles        

                                                             from center of earth)

3. earth in orbit around sun    (center of rotation close to center of sun)

4. binary stars         (if masses of stars are equal center of rotation is in middle)

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Answer:The greater the amount of water that there is it will take longer for the water to freeze because more heat has to be dissipated into the environment

Explanation:

Answer:

The greater the mass of water, the more heat has to be dissipated into the environment and the longer it will take to freeze. The greater the surface area of the water, the faster the water will lose its heat and freeze.

Answer: 8v

Explanation:

The total voltage drop across the first and second resistor is 8 V, hence option A is correct.

Voltage is the fluctuation in electric potential between the two places. It is sometimes produced by electric pressure, electric tension, or voltage source. The work required to move a test charge between two places in a static electric field corresponds to this. The derived measure for voltage in the International System of Units is called a volt. Work per unit energy is expressed in SI units as joules per coulomb, with 1 volt equaling 1 joule per 1 coulomb.

To detect the voltages between two locations in a circuit, use a voltmeter. A common reference point, like the system's foundation, is frequently utilized as one of the points.

A voltage can indicate either a supply of energy or its loss, dissipation, or storage.

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Answer:

The basic purpose for which most simple machines are designed is to reduce the effort (force) required to perform a simple task. To achieve this, the force applied must act over a longer distance or period of time resulting in the same amount of work being performed by a smaller force.

Answer:

to make work easier by reducing the effort to be used

Explanation:

Answer:

200W

Explanation:

W=F*d

P=W/t

P=(100)(10)/5

P=200

Answer:

B. x = 50, Y = 100 ,Z= 150

sorry if it's wrong

Answer:

212 degree F.

(100°C × 9/5) + 32 = 212°F

Answer:

ac = 72 m/s²

Fc = 504 N

Explanation:

We can find the centripetal acceleration of the hammer by using the following formula:

[tex]a_c = \frac{v^2}{r}[/tex]

where,

ac = centripetal acceleration = ?

v = constant speed = 12 m/s

r = radius = 2 m

Therefore,

[tex]a_c = \frac{(12\ m/s)^2}{2\ m}[/tex]

ac = 72 m/s²

Now, the centripetal force applied by the athlete on the hammer will be:

[tex]F_c = ma_c\\F_c = (7\ kg)(72\ m/s^2)[/tex]

Fc = 504 N

Answer:

D. Numbers of atoms

Explanation:

The feature of the components of matter that only stays the same in chemical reactions is: D. numbers of atoms.

The law of conservation of matter (LOCOM) states that mass can neither be created nor destroyed in any chemical reaction.

This ultimately implies that, a balanced chemical equation would always require the same number of atoms on both the reactant side and product side of a chemical reaction.

In conclusion, we can deduce that the feature of the components of matter that only stays the same in chemical reactions is: D. numbers of atoms.

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Answer:

Tiene que patear el balón cerca del nivel del suelo para conseguir el gol.

Explicación:

Leo Messi necesita patear el balón no en el aire, en el nivel del suelo para poder meter el gol para el equipo. Delante del fútbol hay muchos jugadores del equipo contrario dispuestos a detener el tiro libre de Leo Messi. Cuando Leo Messi patea el balón en el aire, los jugadores también saltan en el aire para detener el tiro libre que atraviesa la cabeza y para conseguir el gol Leo Messi tiene que evitar patear el balón en el aire y patear el balón cerca del nivel del suelo. que puede atravesar a los jugadores oponentes cuando lo saltan para detener el balón a través de sus cabezas para que el balón pase por debajo de sus pies y llegue a la portería.

Answer:

Explanation:

When a substance is heated the average kinetic energy of molecules increases and they start moving with an increased speed.As a result between mean separation between the molecules also increases

Halogens are highly reactive nonmetal elements in group 17 of the periodic table. ... Halogens are among the most reactive of all elements. They have seven valence electrons, so they are very “eager” to gain one electron to have a full outer energy level.

Answer:

O. Geologists and archaeologists use different dating processes to determine the age of rocks, fossils, and ancient artifacts.

Explanation:

Redioactive decay is the process whereby the radioactive materials reduces in quantity through the decay of its materials.

For example, if there where 100g of polonium today, and 5 years later, it has reduced to 30g, then, radioactive decay has taken place over the long period of time.

One of its major use is in the determination of the ages of rocks, fossils, and ancient artifiacts through its cabon dating inorder to determining the radioactive decay of those materials over the past few decades.

Absorption is defined as the process which involves the energy change of light to heat.

Thus is defined as the transfer of the energy of a wave to matter as the wave passes through it.

During this process, the light energy gets converted to heat energy which is usually felt on the substance which makes option B the most appropriate choice.

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Answer:

Methane, which generally produces more heat and energy got decreased in the Earth's system, leading to less energy in the Earth system and less energy absorbed by Earth's surface.

Explanation:

Methane produces a great deal of energy than any other gas that plays a role in the greenhouse effect. In several billions of years ago, humans were not engaging in activities that could increase the amount of methane in the earth's system most especially the atmosphere. Such activities that were not done include burning fossil fuel, raising livestock as we have now, and waste disposal. Natural process which includes natural air reduces some amount of methane in the atmosphere.

Answer:

true :-)

Explanation:

Translate : Physically, a stone is dropped into a well and after 10 seconds you can hear the crash against the bottom, if the speed?

Answer : 383 m

Answer:

the answer to this question will be False

Answer:

false.......,.....,...........

Answer:

400 turns

Explanation:

From the question given above, the following data were obtained:

Primary voltage (Vₚ) = 240 V

Number of turns in primary coil (Nₚ) = 8000 turns

Secondary voltage (Vₛ) = 12 V

Number of turns in secondary coil (Nₛ) =.?

The number of turns in the secondary coil can be obtained as follow:

Vₛ / Vₚ = Nₛ / Nₚ

12 / 240 = Nₛ / 800

0.05 = Nₛ / 800

Cross multiply

Nₛ = 0.05 × 800

Nₛ = 400 turns

Therefore, the number of turns in the secondary coil is 400 turns

Answer:

D

Explanation:

Answer:

Protium

Explanation: Protium is an isotope of hydrogen that is composed of one proton and one electron. It is the most abundant form of hydrogen.

Answer:

To be honest. I think all three of them are hydrogen i know Deuterium and Tritium are so I decided to research about protium and it said its also hydrogen.

Explanation:

Protium Deuterium and Tritium are all isotopes of hydrogen

Answer:

Explanation:

For A to become positively charged, a + charge must transfer from B to A.

The charge that must transfer for object A to become positively charged is the negative charge in object A.

Charging by conduction occurs when a charged object causes the flow of electron when it comes in contact with an uncharged object.

An object can either be negatively or positively charged. An object is said to be positively charged when it contains more protons than electron.

Therefore, for object A to be positively charged, the charge that must transfer for object A to become positively charged is the negative charge.

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Answer:

Explanation:

You didn't last any of the variables. You have to list the variables to tell which are which.

Answer:

Controlled variables are hot plate and measuring spoon

Dependant variables are scale and thermometer

Independant variables are beakers and water

Explanation:I tried my best, this should be right