Base your answer to the following question on the
information below.
A 2.00 × 106

-hertz radio signal is sent a distance of

7.30 × 1010

meters from Earth to a spaceship

orbiting Mars.



Approximately how much time does it take the radio
signal to travel from Earth to the spaceship?

Answer:

the potential energy = 2.625

Explanation:

potential energy = mass× acceleration due to gravity × height

mass = 0.75kg

acceleration due to gravity =10m/s²

height =0.35 meters

potential energy = 0.75kg× 10m/s² × 0.35m =2.625 N

The cheetah that can accelerate from rest to a speed of 30.0 m/s in 7.00s has an acceleration of: 4.285 m/s²

The formula and procedure we will use to solve this exercise is:

a = (vf - vi) /t

Where:

Information about the problem:

Applying the acceleration formula we have:

a = (vf - vi) /t

a = (30.0 m/s - 0 m/s) /7.00 s

a = (30.0 m/s m/s) /7.00 s

a = 4.285 m/s²

It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2

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23. Young stars in spiral galaxies are typically found in the disk.

24. in the elliptical galaxies a few new stars might show up in the bulge

25. Stars are formed in the disk of our galaxy.

Elliptical galaxies are generally composed of older stars, with little to no ongoing star formation. This is due to the fact that they have used up or lost most of their interstellar medium. So, there are typically no young stars in elliptical galaxies.

Our galaxy, the Milky Way, is a barred spiral galaxy.

Stars are primarily formed in the disk of our galaxy, particularly in the spiral arms where the interstellar medium is densest.

This is where new stars, including young blue stars and star clusters, are most frequently born. The bulge and halo regions of the Milky Way are primarily composed of older stars, with very little ongoing star formation.

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Answer:

The velocity after 2 seconds can be found through:

V = u +a*t

Where V is final velocity, u is initial velocity, a is acceleration and t is time.

V = 0 + 2* 2= 4 meters/second

The distance (s) can be found through:

V^2= u^2 +2*a* s

Where V is final velocity, u is initial velocity, a is acceleration.

4^2= 0^2 + 2 *2*s

16= 0 + 4s

s= 4 meters

Distance (s) can also be found through:

s= ut + 1/2 at^2

s= 0+ 1/2 *2*2^2= 1 *2*2

s= 4 meters

Explanation:

Answer:

True

Because mitochondria is the powerhouse of the cell.

Explanation:

Hope this helps you

Answer:

True

Explanation:

The ozone layer is a region of the Earth's stratosphere that contains a high concentration of ozone (O3) molecules.

It plays a crucial role in protecting life on Earth by absorbing the majority of the Sun's harmful ultraviolet (UV) radiation. The depletion of the ozone layer, primarily caused by human activities, leads to an increase in UV radiation reaching the Earth's surface. This has significant adverse effects on human health, ecosystems, and the environment.

The ozone layer is located in the Earth's stratosphere, approximately 10 to 50 kilometers above the surface. It is formed by the interaction of UV radiation from the Sun with oxygen molecules (O2). The UV radiation breaks apart the oxygen molecules, and the resulting oxygen atoms (O) combine with other oxygen molecules to form ozone (O3).

The ozone layer is essential because it acts as a shield, absorbing the majority of the Sun's UV-B and UV-C radiation, preventing it from reaching the Earth's surface. UV radiation is harmful to living organisms, as it can cause DNA damage, skin cancer, cataracts, and weakened immune systems. The ozone layer's ability to filter out these harmful rays helps protect human health and supports the functioning of ecosystems.

However, human activities have significantly contributed to the depletion of the ozone layer, primarily through the release of certain chemicals known as ozone-depleting substances (ODS), such as chlorofluorocarbons (CFCs) and halons. These substances were commonly used in aerosols, refrigeration, air conditioning, and fire suppression systems. Once released into the atmosphere, ODS molecules can reach the stratosphere and undergo reactions that break down ozone molecules.

The depletion of the ozone layer has several detrimental effects. Increased UV radiation reaching the Earth's surface can lead to an increase in skin cancer cases, cataracts, and other health issues in humans. UV radiation also harms phytoplankton, which are vital for marine ecosystems and the global carbon cycle. Additionally, UV radiation can negatively impact terrestrial and aquatic ecosystems, causing DNA damage, reduced plant growth, disruption of food chains, and harm to coral reefs and other sensitive marine organisms.

Recognizing the importance of protecting the ozone layer, the international community developed the Montreal Protocol in 1987, which aims to phase out the production and use of ODS. Through global efforts to reduce ODS emissions, there has been a gradual recovery of the ozone layer in recent years.

In short , the ozone layer acts as a natural shield, protecting life on Earth from harmful UV radiation. The depletion of the ozone layer due to human activities has severe consequences for human health, ecosystems, and the environment. It is crucial to continue efforts to reduce ozone-depleting substances and preserve the integrity of the ozone layer for the well-being of present and future generations.

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Answer:

hmm...

Explanation:

Answer: wave a has the higher ampllitude while wave b has the lower amplitude.

Explanation:

wave a has the amplitude of 4 while wave b has the amplitude of one

The length of the rubber band that the boy must use is 0.024 m or 24 mm.

To determine the length of the rubber band, we can use the formula for the potential energy stored in a stretched spring, which is also applicable to a stretched rubber band:

where U is the potential energy stored in the rubber band, k is the spring constant (or in this case, the rubber band constant), and x is the displacement of the rubber band from its natural length.

Since the rubber band is stretched by 0.25 of its natural length, the displacement x is 0.25 times the natural length of the rubber band.

We can solve for the rubber band constant k by using the formula for the velocity of a projectile launched by a spring (or in this case, a rubber band):

where v is the velocity of the projectile, m is the mass of the rubber band, M is the mass of the projectile, and k is the spring constant. We can rearrange this equation to solve for k:

k = (v² M) / (2 m)

We can now combine the two equations to solve for the length of the rubber band, L:

U = 1/2 k x²

U = 1/2 ((v² M) / (2 m)) (0.25 L)²

U = (v² M L²) / (32 m)

The potential energy stored in the rubber band must be equal to the kinetic energy of the projectile when it is launched:

U = 1/2 M v²

(v² M L²) / (32 m) = 1/2 M v²

L = ((16 m v²) / (k M))

L = ((16 m v²) / ((v² M) / (2 m) M))

L = √(32 m^2 / M)

L = (0.032 M)

Substituting the given values, we get:

L = √(0.032 * 0.006)

L = 0.024 m

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Answer:

A manometer is a device similar to a barometer that can be used to measure the pressure of a gas in a vessel. An enclosed pressure gauge is a U-shaped tube with one arm closed, another arm that connects to the electricity to be measured, and a permanent liquid (usually mercury) in between.

Answer:

Endothermic reaction

Explanation:

(a) Endothermic reaction: These are reactions that absorb heat from the surrounding during a chemical reaction. The enthalpy change for endothermic reaction is always positive,  and the energy level of the product is higher than that of the reactant

(b) Exothermic reaction: These are reactions that release heat to the surrounding during chemical reaction. The enthalpy change for exothermic reaction is always positive, and the energy level of the product is lower than that of the reactant.

From the diagram in the question,

Since the energy level of the product is higher than that of the reactant then the reaction is an endothermic reaction and as such, ΔH is positive

Explanation:

Answer:

Potential gravitational energy is the energy that the body has due to the Earth's gravitational attraction. In this way, the potential gravitational energy depends on the position of the body in relation to a reference level.

Explanation:

“The electric flux through a closed surface is equal to the net charge inside the surface divided by the physical constant. This law is a fundamental principle in electrostatics and is expressed mathematically as E.ds = Q/ε0.

Gauss’s Law for electric fields is a fundamental principle in physics, specifically in the study of electrostatics. The law describes the relationship between the electric flux and the distribution of electric charges in a given space. Simply put, it states that the electric flux through a closed surface is proportional to the total amount of electric charges inside the surface. In mathematical terms, the statement of Gauss’s Law for electric fields is as follows: E.ds = Q/ε0Here, E.ds represents the electric flux through a closed surface, Q represents the total electric charge enclosed within the surface, and ε0 is the physical constant known as the permittivity of free space. This equation can be used to calculate the electric field created by a given charge distribution, provided that the electric flux through a closed surface around the distribution is known.

Gauss’s Law for electric fields states that the electric flux through a closed surface is proportional to the net electric charge enclosed within the surface. This law is a fundamental principle in electrostatics and is expressed mathematically as E.ds = Q/ε0.

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Answer:

increases

Explanation:

as we know, that submarines need to be really really strong to go down in the ocean. That means that the more they go down in the water (liquid) then, they will face more pressure. That as we said, that the more down they go, the more pressure will be on them, which means that the pressure will keep on increasing as you go down and down in the ocean.

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Many bird wings are more convex on the upper surface than they are on the lower surface, this enables the wing to provide greater lift because A. air moves more slowly over the top surface of the wing than over the lower surface.

This difference in air pressure leads to the creation of an upward force called lift that counteracts the force of gravity on a bird's wings to keep it aloft.The upper surface of the bird's wings has a more curved shape and a higher angle of attack than the lower surface. Due to this shape, the air moves faster over the wing's surface, which results in a lower pressure zone above the wing.

Meanwhile, the air below the wings moves slower and thus, there's a higher pressure zone below the wing. The difference in pressure creates a lifting force that helps the bird to fly. In summary, the more convex shape of the upper surface of a bird's wing creates a lower air pressure zone above it and a higher air pressure zone below it, thus providing greater lift that enables the bird to fly and glide. So the correct answer is  A. air moves more slowly over the top surface of the wing than over the lower surface.

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Red has a wavelength of about 700 nanometers, while violet has a wavelength of about 380 nanometers.

Ultra - violet (UVC) light, also referred to as germicidal UV light, is a type of electromagnetic spectrum that is broken up into groups based on wavelength. Radio signals, microwave, thermal daylight, white spectrum, X-rays, & gamma rays are some other well-known subcategories.

The UVB & UVC rays have the lowest wavelengths, while UVA rays have the greatest ones. The ozone on Earth filters all UVC as well as some UVB photons while transmitting Uva and Uvb through the atmosphere.

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The mass defect (deficit) of an atom is defined as the difference between the actual mass of the atom and the sum of the masses of its individual protons and neutrons.

To calculate the mass defect in amu/atom for the given atom of 108In, we need to first determine the number of protons and neutrons in its nucleus. The atomic number of indium (In) is 49, which means that an atom of 108In has 49 protons. To determine the number of neutrons, we subtract the atomic number from the mass number:

Number of neutrons = Mass number - Atomic number

                   = 108 - 49

                   = 59

The mass of 59 neutrons is:

mass of 59 neutrons = 59 x 1.008665 amu = 59.476935 amu

The mass of 49 protons is:

mass of 49 protons = 49 x 1.007825 amu = 49.397725 amu

The total mass of the 108In nucleus is:

total mass = mass of protons + mass of neutrons

          = 49.397725 amu + 59.476935 amu

          = 108.87466 amu

The actual mass of the atom is given as 107.909678 amu, so the mass defect is:

mass defect = actual mass - total mass

           = 107.909678 amu - 108.87466 amu

           = -0.964982 amu

The negative sign indicates that the mass of the nucleus is less than the sum of the masses of its individual protons and neutrons. Finally, to convert the mass defect to energy, we can use the mass-energy equivalence formula:

1 amu = 931.5 MeV/c^2

Therefore, the mass defect in energy units is:

mass defect = 0.964982 amu x 931.5 MeV/c^2

           = 898.82416 MeV\(/c^2\)

Note that the mass defect is negative and the corresponding energy is positive, indicating that energy is released when the nucleus is formed.

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Answer:

100 feet

Explanation:

The impulse acting on an object is equal to the change in momentum it experiences. When we talk about net force, we're really talking about the rate at which momentum is changing. A constant net force means that momentum is changing at a constant rate, while a variable net force means that momentum is changing at a changing rate.

Now, if both graphs represent the same impulse acting on the baseball, it means that they both represent the same change in momentum. This tells us that the area under both graphs must be the same. This is because the area under a force-time graph represents the impulse experienced by an object.

So, in terms of geometric properties, the two graphs must have the same area under them if they represent the same impulse acting on the baseball. This holds true whether the net force is constant or variable.

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So, if the Juan de Fuca plate keeps moving at its current rate and direction, it would take around 17,307,692.3 years for it to entirely bury beneath the North American plate.

The Juan de Fuca plate is subducting beneath the North American plate at the Cascadia trench at a pace of approximately 9.8 to 13.8 feet per 100 years as a result of this plate's movement northeastward in relation to North America along a convergent plate boundary.

To begin, we can apply the formula:  distance = rate x time

To begin, multiply 450 km by 1,000,000 mm/km to convert the breadth of the Juan de Fuca plate from kilometres to millimetres:

450 km x 1,000,000 mm/km = 450,000,000 mm

The Juan de Fuca plate is therefore 450,000,000 mm wide.

The values we have can then be entered into the algorithm to solve for time:  distance = rate x time

450,000,000 mm = 26 mm/year x time

time = 450,000,000 mm / 26 mm/year

time ≈ 17,307,692.3 years

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\(\\ \bull\tt\longmapsto Volume=LBH\)

\(\\ \bull\tt\longmapsto Volume=8(4)(3)\)

\(\\ \bull\tt\longmapsto Volume=96m^3\)

Answer:

Formular:

\({ \boxed{ \bf{v = length \times width \times height}}}\)

» length, l = 8m

» width, w = 4m

» height, h = 300cm = 3 m

\({ \tt{• Therefore :→}} \: { \sf{ volume = (8 \times 4 \times 3)}} \\ → { \sf{ \underline{ \: \: volume = 96 \: {m}^{3} \: \: }}}\)

Answer:

E(nergy) = V * Q        where V(oltage) = work/charge

E = 50 J/C * 1.6E-19 C = 8.0E-18 Joules

The proton gains approximately 8.01 x \(10^-18\) joules of energy as it accelerates through the 50-volt electric potential difference.

To calculate the energy gained by a proton as it accelerates through an electric potential difference, we can use the formula:

Energy (in joules) = Charge of the particle (in coulombs) × Electric potential difference (in volts)

The charge of a proton is approximately 1.602 x \(10^-19\) coulombs.

Given that the electric potential difference is 50 volts, we can now calculate the energy gained by the proton:

Energy = (1.602 x \(10^-19\) C) × (50 V)

Energy ≈ 8.01 x \(10^-18\) joules

Hence, the proton gains approximately 8.01 x \(10^-18\) joules of energy as it accelerates through the 50-volt electric potential difference.

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Answer:

B

Explanation:

To determine the diameter of the cylindrical rod that can withstand a load of 650 N, we need to consider the yield strength of the material and the applied load. the diameter of the rod is approximately 11.62 mm.

By using the formula for stress (force divided by area) and rearranging it to solve for the diameter, we can find the required diameter of the rod.

The stress experienced by the rod can be calculated using the formula:

Stress = Force / Area

Given that the yield strength of the steel is 310 MPa, we can set up the equation:

310 MPa = 650 N / (π * (diameter/2)^2)

We can rearrange the equation to solve for the diameter:

diameter = √(650 N / (310 MPa * π)) * 2

Substituting the given values, we find:

diameter ≈ √(650 / (310 * 10^6 * π)) * 2 ≈ 11.62 mm

Therefore, the required diameter of the rod to withstand the load is approximately 11.62 mm.

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Note that the correct times are t = 0, t = 1/4, t = 1/2. You can tell from the spaces between the two digits. i.e 1&4 and 1&2

Answer:

y(0) = 2.00 cm

y(1/4) = 1.56 cm

y(1/2) = 1.21 cm

Explanation:

This is a very simple exercise, the displacement of the oscillating weight from equilibrium has already been modeled by the equation:

\(y(t) = 2e^{-t} cos 4t\)

Where y = displacement ( in cm)

and t = time (in seconds)

The task is to find the displacement when t = 0, 1/4 and 1/2

When t = 0 s

\(y(0) = 2e^{0} cos 4(0)\\y(0) = 2* 1*1\\y(0) = 2.00 cm\)

When t = 1/4 s

\(y(1/4) = 2e^{-1/4} cos 4(1/4)\\y(14) = 2e^{-1/4} cos (1)\\y(1/4) = 1.56 cm\)

When t = 1/2

\(y(1/2) = 2e^{-1/2} cos 4(1/2)\\y(14) = 2e^{-1/2} cos (2)\\y(1/2) = 1.21 cm\)

The work done by the external force on the child is positive.

When a force is applied to an object, work is done on that object. Work is defined as the product of the force applied on an object and the distance over which the force acts. In this case, the external force acted on the child on a skateboard, causing her speed to increase from 2 m/s to 3 m/s.

To calculate the work done, we can use the formula for work:

\[ \text{Work} = \text{Force} \times \text{Distance} \times \cos(\theta) \]

Since the child's speed increased, we know that the force and displacement acted in the same direction. Therefore, the angle between the force and displacement vectors, denoted by theta (θ), is 0 degrees, and the cosine of 0 degrees is 1.

Considering the child's speed increased, we can conclude that the force applied in the direction of motion did positive work on the child. The positive work done by the external force resulted in an increase in the child's kinetic energy, causing her speed to change.

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