Identify the independent variable in the experiment conducted by Janessa

Answer:

Explanation:

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The population of ducks will evolve so that most ducks are better at finding food in wet areas.

Natural selection:

In evolution, the individual is selected on a certain parameters by nature.

For example- Selection parameter  is ability of finding food.

Here, the popution good at finding food in dry places will die and only the individuals with ability to find food in wet places will survive and reproduce.

Therefore, the population of ducks will evolve so that most ducks are better at finding food in wet areas.

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Answer:

the answer is 0.5m/s..... see the image for explanation

(a) The rock has a weight w according to

w = m g

where m is its mass and g = 9.80 m/s² is the magnitude of the acceleration due to gravity. So

w = (20.0 kg) (9.80 m/s²) = 196 N

(b) Charmander kicks the rock with an upward force (magnitude f ) that overcomes the weight of the rock, and the net force on it is 230 N. This means

f - w = 230 N

f - 196 N = 230 N

f = 426 N

(c) I think the question is supposed to say, "What is the acceleration of the rock," and not asking about Charmander's acceleration. By Newton's second law, the net force on the rock is equal to its mass times its acceleration:

230 N = (20.0 kg) a

a = (230 N) / (20.0 kg)

a = 11.5 m/s²

Answer:

The time taken is  [tex]t = 500 \ s[/tex]

Explanation:

From the question are told that

  The speed of the incoming water is  [tex]v = 25 cm/s[/tex]

  The cross-sectional area of the host pipe is  [tex]a = 2.0 cm^2[/tex]

Generally the rate at which the container is been filled is mathematically represented as

         [tex]\r V = v * a[/tex]

=>      [tex]\r V = 25 * 2[/tex]

=>      [tex]\r V = 50\ cm^3/s[/tex]

Generally [tex]2.5 L = 25000 cm^3[/tex]

Generally the time taken is  mathematically represented as

      [tex]t = \frac{25000}{50}[/tex]

=>   [tex]t = 500 \ s[/tex]

The time required for a 25-L container to be filled with water is 8.3 min.

The given parameters;

The volumetric flow rate of the water is calculated as follows;

Q = Av

where;

[tex]Q = Av\\\\\frac{V}{t}= Av\\\\t = \frac{V}{Av} \\\\t = \frac{25,000}{2 \times 25} \\\\t = 500 \ s\\\\t = 8.3 \min[/tex]

Thus, the time required for a 25-L container to be filled with water is 8.3 min.

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Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 3 × 12

We have the final answer as

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Answer:

1.74 x 10^6

Explanation:

Brainliest :)

The approximate radius of the Moon is [tex]1.736 * 10^7[/tex] meters, or 17,360 kilometers.

To find the radius of the Moon, we can use Newton's law of universal gravitation, which relates the acceleration due to gravity (g) to the mass of the celestial body (M) and the distance (radius, r) between the center of the body and the object experiencing the gravitational force.

The formula for the acceleration due to gravity on the surface of a celestial body is:

[tex]g = G * (M / r^2),[/tex]

where:

g = acceleration due to gravity on the Moon's surface ([tex]1.62 m/s^2[/tex]),

G = universal gravitational constant (approximately[tex]6.67430 * 10^{-11[/tex] m^3/kg/s^2),

M = mass of the Moon ([tex]7.35 * 10^{22[/tex] kg), and

r = radius of the Moon (what we want to find).

Let's rearrange the formula to solve for the radius (r):

[tex]r^2[/tex] = G * (M / g).

Now, we can plug in the known values:

[tex]r^2 = (6.67430 * 10^{-11} m^3/kg/s^2) * (7.35 * 10^{22} kg / 1.62 m/s^2)[/tex].

Calculate the value of [tex]r^2[/tex]:

[tex]r^2[/tex] ≈ [tex]3.018 * 10^{14} m^2.[/tex]

Finally, take the square root of both sides to find the radius (r):

r ≈ [tex]\sqrt{(3.018 * 10^{14} m^2)[/tex]≈ [tex]1.736 * 10^7[/tex] meters.

So, the approximate radius of the Moon is[tex]1.736 * 10^7[/tex] meters, or 17,360 kilometers.

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Answer:

The remaining light bulbs will go out.

Explanation:

The light bulb that was taken out routed power to the other light bulbs, there for, not giving power to the next light bulbs will make them turn off or, "go out". This may be incorrect, as you did not provide a picture of the circuit.

When a light bulb is removed from the circuit below, leaving a gap, then the other light bulbs in the circuit will go out, which is present in the first option, as the light bulb is a critical component in the circuit.

In an electrical circuit, all of the components are connected in a specific way to allow the flow of electricity, these components are connected in series, which means that the current flows through each one after the other. In the case of a circuit with multiple light bulbs connected in series, each light bulb acts as a resistor, so when one of the light bulbs is removed, the circuit is broken and the electricity flow is interrupted.

Hence, when a light bulb is removed from the circuit below, leaving a gap, then the other light bulbs in the circuit will go out, which is present in the first option.

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Answer:

Explanation:

refractive index of ember = sin of angle of incidence / sin of angle of refraction

= sin 35 / sin24

= .5735 / .4067

= 1.41

This is refractive index of ember with respect to water

refractive index of ember with respect to water

= wμe = μe / μw

μe = wμe x  μw

= 1.33 x 1.41

= 1.87

refractive index of ember with respect to air = 1.87 .

Answer: Metalloids

Explanation:

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Answer:

10 °C

Explanation:

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

Egde length (L) of aluminum = 20 cm

Density of Aluminum = 2.7 g/cm³

Specific heat capacity (C) of aluminum = 0.217 cal/ g°С

Heat (Q) energy = 47000 cal

Change in Temperature (ΔT) =?

Next, we shall determine the volume of the aluminum. This can be obtained as follow:

Egde length (L) of aluminum = 20 cm

Volume (V) of aluminum =?

V = L³

V = 20³

V = 8000 cm³

Thus, the volume of the aluminum is 8000 cm³

Next, we shall determine the mass of the aluminum. This can be obtained as follow:

Density of Aluminum = 2.7 g/cm³

Volume of Aluminum = 8000 cm³

Mass of aluminum =.?

Density = mass/volume

2.7 = mass /8000

Cross multiply

Mass of aluminum = 2.7 × 8000

Mass of Aluminum = 21600 g

Finally, we shall determine the change in temperature of the aluminum as follow:

Specific heat capacity (C) of aluminum = 0.217 Cal/g°С

Heat (Q) energy = 47000 Cal

Mass (M) of Aluminum = 21600 g

Change in Temperature (ΔT) =?

Q = MCΔT

47000 = 21600 × 0.217 × ΔT

47000 = 4687.2 × ΔT

Divide both side by 4687.2

ΔT = 47000 / 4687.2

ΔT = 10 °C

Therefore, the increase in the temperature of the aluminum is 10 °C.

The change in temperature of this cube of aluminum is equal to: B. 10°C

Given the following data:

To find the change in temperature of this cube of aluminum:

First of all, we would determine the volume of this cube of aluminum.

[tex]Volume \;of \;a \;cube = L^3\\\\Volume \;of \;a \;cube = 20^3\\\\Volume \;of \;a \;cube = 8000\; cm^3[/tex]

Next, we calculate the mass of this cube of aluminum:

[tex]Mass = Density \times Volume\\\\Mass = 2.7 \times 8000[/tex]

Mass = 21,600 grams.

Now, we can find the change in temperature of this cube of aluminum:

Mathematically, the quantity of heat energy is given by the formula;

[tex]Q = mc\theta[/tex]

Where:

Substituting the parameters into the formula, we have;

[tex]47000 = 21600 \times 0.217 \times \theta\\\\47000 = 4687.2 \theta\\\\ \theta =\frac{47000}{4687.2} \\\\ \theta = 10.03[/tex]

Change in temperature = 10°C

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Answer:

12 dozen

Explanation:

Answer:

The table is proportional.

Explanation:

You would do 21/6 to get 3.5. Then 28/8 to get 3.5. After 35/10 to get 3.5. Finally 49/14 to get 3.5. If each answer (3.5) is the same than it is proportional.

hope i helped

Answer:

i do

Explanation:

Answer:A

Explanation:

Answer:

55

Explanation:

I hope this answer help u

Answer:

i think no. A is the coeerct answer

hope this will help you

Answer:

she had socks one and was shuffeling so she had static

Explanation:

Answer:

Darwinism is a theory of biological evolution developed by the English naturalist Charles Darwin (1809–1882) and others, stating that all species of organisms arise and develop through the natural selection of small, inherited variations that increase the individual's ability to compete, survive, and reproduce.

Explanation:

Explanation:

Gravity is a very important force. Every object in space exerts a gravitational pull on every other, and so gravity influences the paths taken by everything traveling through space.

It is the glue that holds together entire galaxies. It keeps planets in orbit.

Answer:

The moon's gravitational pull on the Earth is the main cause of the rise and fall of ocean tides. The moon's gravitational pull causes two bulges of water on the Earth's oceans—one where ocean waters face the moon and the pull is strongest and one where ocean waters face away from the moon and the pull is weakest.

Explanation:

Answer:10N

Explanation:

Answer: The answer is B. Doppler

Explanation: This change is a common physical demonstration of the Doppler effect. The Doppler effect describes the change in the observed frequency of a wave when there is relative motion between the wave source and the observer

Doppler causes an apparent change in the color of a star moving toward or away from an observer.

The Doppler effect is the plain trade-in frequency of a wave because the supply of the wave is transferring toward or away from an observer or vice-versa. Any object that emits waves, whether sound waves or electromagnetic waves, could have a real frequency of emitting waves and an obvious frequency.

A decreased frequency shift is called a "red shift". The faster a celeb moves far from the earth, the more its mild is shifted to lower-frequency colorations. This impact is referred to as the "Doppler shift".

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Answer:

12g/cm³

Explanation:

Given parameters:

Mass of the metal  = 1200g

Volume of water in the measuring cylinder  = 150cm³

Volume of the metal  = 100cm³

Unknown:

Density of the metal  = ?

Solution:

Density is the mass per unit volume of a substance;

  Density  = [tex]\frac{mass}{volume}[/tex]

Now insert the parameters and solve;

    Density  = [tex]\frac{1200}{100}[/tex]   = 12g/cm³

Answer:

Particles in a: gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

i hope this helps your answer

Answer:

liquids vibrate, move about, and slide past each other. solids vibrate but generally do not move from place to place.

Answer:

You can hold it at a higher level. This creates more tension between the apple and gravity. Creating a higher level of potential energy

Answer:

[tex]g=274\ m/s^2[/tex]

Explanation:

Mass of the Sun, [tex]M=1.99\times 10^{30}\ kg[/tex]

The radius of the Sun, [tex]r=6.96\times 10^8\ m[/tex]

We need to find the acceleration due to gravity on the surface of the Sun. It is given by the formula as follows :

[tex]g=\dfrac{GM}{r^2}\\\\g=\dfrac{6.67\times 10^{-11}\times 1.99\times 10^{30}}{(6.96\times 10^8)^2}\\\\g=274\ m/s^2[/tex]

So, the value of acceleration due to gravity on the Sun is [tex]274\ m/s^2[/tex].

The acceleration due to gravity, in meters per second squared, on the surface of the Sun is [tex]296.88 \;m/s^2[/tex].

Given the following data:

Gravitational constant = [tex]6.67 \times 10^{-11}[/tex]

To calculate the acceleration due to gravity, in meters per second squared, on the surface of the Sun:

From the law of gravitational force, we have the formula:

[tex]g = \frac{Gm}{r^2}[/tex]

Where:

Substituting the given parameters into the formula, we have;

[tex]g = \frac{6.67 \times 10^{-11} \times 1.99 \times 10^{30}}{(6.69 \times 10^8)^2} \\\\g= \frac{1.33 \times 10^{20} }{4.48 \times 10^{17}} \\\\g=296.88 \;m/s^2[/tex]

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Answer:

8 newtons

Explanation:

Balanced forces have an equal amount of newtons. 5+3=8, so the other team will need 8 newtons.

In a tug of war contest, one person pulls with a force of 5 Newtons. Another person on the same team pulls with a force of 3 Newtons. In order for the force of the rope to be balanced,force would the other team need to be pulling with is 8 newtons.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

A resultant force vector is described as a single vector that has the same consequence as several other vectors taken together.To create the resulting force vector, two vectors facing the opposite direction are subtracted from one another. Here Net Force = 5 - (-3) = 8 N

In order for the force of the rope to be balanced, force would the other team need to be pulling with is 8 Newtons.

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In the horizontal direction, the forces acting on the person are

• friction with magnitude f, opposing motion, and

• the horizontal component of the pulling force (itself with mag. p ) with mag. p cos(30º), in the direction of motion.

There is no friction in the vertical direction, so we omit any discussion of the vertical forces.

By Newton's second law, we then have

p cos(30º) - f = m a cos(30º)

where m is the person's mass, and a is their acceleration so that a cos(30º) is the magnitude of the horizontal component of acceleration. The person is pulled by a force of p = 401 N, so solve for f :

(401 N) cos(30º) - f = (53 kg) (0.59 m/s²) cos(30º)

f ≈ 320 N

Answer:

Galileo performed a famous experiment where he used a ball rolling on a ramp (inclined plane) to study the motion of objects under the influence of gravity. The ramp allowed him to make more precise measurements because the ball moved more slowly along the ramp than if it were simply dropped. Galileo discovered through this experiment that the objects fell with the same acceleration, proving his prediction true, while at the same time disproving Aristotle's theory of gravity (which states that objects fall at speed proportional to their mass). Galileo's conclusion from this thought experiment was that no force is needed to keep an object moving with constant velocity. Newton took this as his first law of motion. One result of the experiment surprised Galileo, and one surprises us. Galileo found that the heavy ball hit the ground first, but only by a little bit. Except for a small difference caused by air resistance, both balls reached nearly the same speed. And that surprised him. According to history, Galileo’s experiment on falling bodies largely contributed to Isaac Newton’s Law of Gravity. In Galileo’s experiment, he is said to have dropped balls from the Leaning Tower of Pisa. The balls were made of the same material but had different masses. Galileo set out to prove that the time it took for these objects to reach the ground would be the same. Galileo proved that objects reached the ground at the same time.

Explanation:

Copy and pasted from Thawkins000

Galileo is renowned with demonstrating that gravity causes things of varying masses to fall with the same acceleration by dropping weights from the Leaning Tower of Pisa.

Gravitational force is the force by which an object attracts other objects into its center of mass. Earth attracts every objects into its ground and that's why  we are all standing on the surface.

The Pisa-Tower experiment by Galileo reached at some results that a heavy object and a light object will fall to the ground simultaneously from a particular height.

All bodies of any mass will fall down simultaneously at the same time from a particular height. That is the acceleration of all free-falling bodies are same. We know that acceleration is the ratio of force and mass.

The force exerted on a bigger body is greater than the smaller ones in the same force field. This implies acceleration remains constant in the case of all free-falling bodies.

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Answer:

D

Explanation:

Answer:d

Explanation: