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3 years ago

Please help ASAP <3 thanks

Physics

2 answers:

Vlad [161]3 years ago

7 0

1.false
2.true
3.true
4.true
5.false/not entirely sure
6.true

Eduardwww [97]3 years ago

5 0

<h2>1. Right answer: False </h2>

The tides are produced by a gravitational imbalance that decompensates the oceans throughout the Earth. They are ups and downs of sea level that occur several times a day and change with the lunar phases, but not because of the shape that the Moon looks like.

<em>However, it should be noted that the Sun also exerts a gravitational force in the oceans, but to a lesser extent, because it is further away than the Moon. </em>

The Moon attracts the water that is closest to it; thus, the part of the ocean that is facing the Moon bulges towards it, and on the opposite side too, the water bulges in the opposite direction.

This is due to inertia, because the Moon attracts the whole Earth, in addition to water. What happens is that the Earth is rigid and does not bulge.<u> Inertia resists gravity and pulls in the opposite direction</u>. That is why the ocean on the other side of the Earth also bulges, although less.

<h2>2. Right answer: True </h2>

The gravity field of the Earth can be used to accelerate a spacecraft. This is true when in a specific point the direction of the movement of the spacecraft is the same direction of the movement of the planet.

In this case the craft will be “catched” by the Earth’s gravitational field and its energy, accelerating the spacecraft. This is known as gravitational assistance.

<h2>3. Right answer: True </h2>

The Solar System is in one of the arms of the Milky Way (which is a spiral-shaped galaxy whose center has its own gravity), near Orion's arm.

The Sun along with the entire solar system, revolves around the center of the Milky Way in an almost circular orbit and travels at about 828,000 km/h .

<h2>4. Right answer: True </h2>

If the force of gravity were to disappear on Earth, everything that is not subjected to it would immediately fly into outer space in a straight line, including the water of the oceans and the terrestrial atmosphere.

If this happened, it would be fatal for life on Earth, given the great importance of the atmosphere that acts as a protective shield against meteorites, which disintegrate into dust due to the friction they suffer when making contact with air; in addition this shield absorbs much of the ultraviolet solar radiation in the ozone layer.

<h2>5. Right answer: False </h2>

The mass $m$ is the measure of how much matter there is in an object, this will remain the same regardless of whether it is on Earth or Jupiter. What does change is its weight $W$ (as seen on equation 1), which is the product of the mass and the gravity $g$ .

$W=mg$ (1)

This is because the gravity is not the same on Jupiter as it is on Earth.

<h2>6. Right answer: False </h2>

As explained in the prior answer, the weight is the product of the mass $m$ and the gravity $g$ :

$W=mg$ (1)

If we want to find the mass, we have to find $m$ in equation (1):

$m=\frac{W}{g}$ (2)

As you can see, the mass is the result of <u>dividing</u> the weight by the gravity.

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What caused magnetic fields? What happens If you keep breaking a magnet in two until you reach a single atom?

mote1985 [20]

magnetic materials will produce magnetic field near it

All magnets are made up of small magnet type atoms which are known as domains

These all atoms will align itself so that they all produce strong magnetic field along the axis

this magnetic field will become more strong as more number of atoms are aligned.

Now if we break the magnet into small piece then the magnetic field strength will start decreasing and at the end when only one atom will remain then the magnetic field strength will reduce to the field of one atom only.

6 0

3 years ago

Calculate the maximum capillary rise/fall of mercury in a 0.5 mm radius glass capillary. Assume that the surface tension for mer

tekilochka [14]

Answer: 0.01 m

Explanation: The formulae for capillarity rise or fall is given below as

h = (2T×cosθ)/rpg

Where θ = angle mercury made with glass = 50°

T = surface tension = 0.51 N/m

g = acceleration due gravity = 9.8 m/s²

r = radius of tube = 0.5mm = 0.0005m

p = density of mercury.

h = height of rise or fall

From the question, specific gravity of density = 13.3

Where specific gravity = density of mercury/ density of water, where density of water = 1000 kg/m³

Hence density of mercury = 13.3×1000 = 13,300 kg/m³.

By substituting parameters, we have that

h = 2×0.51×cos 50/0.0005×9.8×13,300

h = 0.6556/65.17

h = 0.01 m

8 0

3 years ago

Why does the large number of hydrogen atoms in the universe suggest that other elements?

lidiya [134]

Answer:

Explanation:

The abundance of the chemical elements is a measure of the occurrence of the chemical elements relative to all other elements in a given environment. Abundance is measured in one of three ways: by the mass-fraction (the same as weight fraction); by the mole-fraction (fraction of atoms by numerical count, or sometimes fraction of molecules in gases); or by the volume-fraction. Volume-fraction is a common abundance measure in mixed gases such as planetary atmospheres, and is similar in value to molecular mole-fraction for gas mixtures at relatively low densities and pressures, and ideal gas mixtures. Most abundance values in this article are given as mass-fractions.

For example, the abundance of oxygen in pure water can be measured in two ways: the mass fraction is about 89%, because that is the fraction of water's mass which is oxygen. However, the mole-fraction is about 33% because only 1 atom of 3 in water, H2O, is oxygen. As another example, looking at the mass-fraction abundance of hydrogen and helium in both the Universe as a whole and in the atmospheres of gas-giant planets such as Jupiter, it is 74% for hydrogen and 23–25% for helium; while the (atomic) mole-fraction for hydrogen is 92%, and for helium is 8%, in these environments. Changing the given environment to Jupiter's outer atmosphere, where hydrogen is diatomic while helium is not, changes the molecular mole-fraction (fraction of total gas molecules), as well as the fraction of atmosphere by volume, of hydrogen to about 86%, and of helium to 13%.[Note 1]

The abundance of chemical elements in the universe is dominated by the large amounts of hydrogen and helium which were produced in the Big Bang. Remaining elements, making up only about 2% of the universe, were largely produced by supernovae and certain red giant stars. Lithium, beryllium and boron are rare because although they are produced by nuclear fusion, they are then destroyed by other reactions in the stars.[1][2] The elements from carbon to iron are relatively more abundant in the universe because of the ease of making them in supernova nucleosynthesis. Elements of higher atomic number than iron (element 26) become progressively rarer in the universe, because they increasingly absorb stellar energy in their production. Also, elements with even atomic numbers are generally more common than their neighbors in the periodic table, due to favorable energetics of formation.

The abundance of elements in the Sun and outer planets is similar to that in the universe. Due to solar heating, the elements of Earth and the inner rocky planets of the Solar System have undergone an additional depletion of volatile hydrogen, helium, neon, nitrogen, and carbon (which volatilizes as methane). The crust, mantle, and core of the Earth show evidence of chemical segregation plus some sequestration by density. Lighter silicates of aluminum are found in the crust, with more magnesium silicate in the mantle, while metallic iron and nickel compose the core. The abundance of elements in specialized environments, such as atmospheres, or oceans, or the human body, are primarily a product of chemical interactions with the medium in which they reside.

4 0

3 years ago

A) the unstretched length of each elastic rope is 24m. The rope obeys hookes law. The vertical distance between P and Q is 35m.

solong [7]

Explanation:

a) The rope obeys Hooke's law, so:

F = k Δx

The elastic energy in the rope is:

EE = ½ k Δx²

Or, in terms of F:

EE = ½ F Δx

Use trigonometry to find the stretched length.

cos 20° = 35 / x

x = 37.25

So the displacement is:

Δx = 37.25 − 24

Δx = 13.25

The elastic energy per rope is:

EE = ½ (3.7×10⁴ N) (13.25 m)

EE = 245,000 J

There's two ropes, so the total energy is:

2EE = 490,000 J

Rounded to one significant figure, the elastic energy is 5×10⁵ J.

b) The elastic energy in the ropes is converted to gravitational energy.

EE = PE = mgh

5×10⁵ J = (1.2×10³ kg) (9.8 m/s²) h

h = 42 m

Rounded to one significant figure, the height is 40 m. So the claim is not justified.

6 0

2 years ago

80 POINTSSS

Semenov [28]

Answer:

closed parallel circuit

7 0

3 years ago