Rita is riding a 7.0 kilogram bike at a velocity of 15 meters/second. Rita’s mass is 42 kilograms. What is her momentum?

To generate 3.00 kW of power at an average voltage of 0.60 V and current of 10A, we can use the formula P = VI, where P is power, V is voltage, and I is current.

First, we need to convert the power output from kW to W, which is 3,000 W.

Next, we can plug in the values for voltage and current to get 3,000 W = 0.60 V x 10A.

To find the number of stacked cells needed, we need to know the power output of each individual cell. Assuming all cells have the same power output, we can divide the total power output (3,000 W) by the power output of one cell.

The power output of each cell can be calculated using the formula P = VI, where V is the average voltage of the fuel cell and I is the current. Therefore, the power output of one cell is 0.60 V x 10A = 6 W.

Dividing the total power output of 3,000 W by the power output of one cell (6 W) gives us the number of stacked cells needed:

3,000 W ÷ 6 W/cell = 500 cells

Therefore, we need 500 stacked cells to generate 3.00 kW of power at an average voltage of 0.60 V and current of 10A.

To generate a specific amount of power using fuel cells, we can use the formula P = VI and the power output of each individual cell to calculate the number of stacked cells needed. In this case, we found that 500 stacked cells are needed to generate 3.00 kW of power at an average voltage of 0.60 V and current of 10A, assuming all cells have the same power output.

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Answer:

Answer:

I am going to make an educated guess and say... B. 3 m/s²

Explanation:

I'm pretty certain that this is the correct answer.

For me, it was a toss-up between B and C, but I don't really think it's C.

But, then again, I am not 100% sure.

I hope you get it right! Have a blessed day! (✿◠‿◠)

Given:

Three types of materials A, B, and C are there.

The coefficient of absorption of A is 30 %, B is 47 %, and C is 62 %.

To find:

Which material would you recommend and why?

Explanation:

Soundproofing is usually achieved by using materials that absorbed or reduce sounds. The coefficient of absorption of a material refers to that material's ability to absorb sound. The higher the percentage of a material absorption coefficient, the better the material's ability to absorb sound.

Hence, the material with a 62 % absorption coefficient that is Sample C has the greatest ability of the three materials to absorb sound effectively.

B) Sample C, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest.

Answer:

Given:

Three types of materials A, B, and C are there.

The coefficient of absorption of A is 30 %, B is 47 %, and C is 62 %.

To find:

Which material would you recommend and why?

Explanation:

Soundproofing is usually achieved by using materials that absorbed or reduce sounds. The coefficient of absorption of a material refers to that material's ability to absorb sound. The higher the percentage of a material absorption coefficient, the better the material's ability to absorb sound.

Hence, the material with a 62 % absorption coefficient that is Sample C has the greatest ability of the three materials to absorb sound effectively.

B) Sample C, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the small

I believe they should fall at the same pace.

Answer:

The septic tank of an abandoned property.

Almost anywhere at a closed refinery (most refineries will never be torn down due to the massive remediation costs involved when they are. Find a good hiding spot there and place the body in the open or bury it)

Numerous quarries are around and most are filled with water. If you ensure that the body will not float to the surface, they are often great disposal locations.

Inside the wall of a home or building - If the body is allowed to desiccate (mummify) then there will be little or no odor. Simply open a wall,insert the body and replaster or drywall it and paint over it.

Underneath an area to be used as a pen or feed lot for domesticated animals. The weight of the animals, plus their manure and the straw placed down to control it will form its own "cap" over the burial site.

In plain sight - The roof of tall abandoned building (hidden from overhead viewing) , an open area in a remote part of the country (after staying there for 2-3 days to see if anyone comes along), or in a storm drain along a lightly used state or county road.

Answer:

circuit b will have the higher current than circuit a

Given:

Diameter, D = 10.0 m

Distance, x = 7.38 x 10¹⁰ m

Wavelength, λ = 633 nm

Let's find how far apart the closest objects it could possibly resolve.

First, apply the formula for the angle for angle separation (limit of resolution):

Thus, we have:

Now, to find the distance of the closest objects, we have:

Thus, we have:

Therefore, the distance of the closest objects is 5699.28 meters.

• ANSWER:

5699.28 m

Question: A 2.0 kg sphere with a velocity of 6.0 m/s collides head-on and elastically with a stationary 10 kg sphere, What is thier velocities after collision.

Answer:

v = 6 m/s, v' = 0 m/s

Explanation:

From the question,

For Elastic collision,

mu+m'u' = mv+m'v'......................... Equation 1

Where m = mass of the first sphere, m' = mass of the second sphere, u = initial velocity of the first sphere, u' = initial velocity of the second sphere, v = final veolocity of the first sphere, v' = final velocity of the second sphere.

Also,

The relative velocity before collision = relative velocity after collision

u-u' = v-v'............................ Equation 2

Given:  m = 2 kg, m' = 10 kg, u = 6 m/s, u' = 0 m/s

Substitute into equation 1 and 2

2(6)+10(0) = 2v+10v'

2v+10v' = 12.............. Equation 3

6-0 = v-v'

v-v' = 6 ................... Equation 4

Solve equation 3 and 4 simultaneously.

v = 6+v'............. Equation 5

Substitute equation 5 into equation 3

2(6+v')+10v' = 12

12+2v'+10v' = 12

12v' = 12-12

v' = 0/12

v' = 0 m/s.

Also substitute the value of v' into equation 5

v = 6+0

v = 6 m/s

According to the Brewster's law The angle of incidence is θ=tan −1n.

What is Brewster's law?
Brewster's law is a relationship for light waves that states that if a light ray is allowed to fall on the surface of the a transparent medium in a way that refracted ray makes a 90° angle with the reflected ray, the maximum polarisation (vibration in one aircraft only) can be achieved. The law bears Sir David Brewster's name, a Scottish physicist who first suggested it in 1811. The illustration depicts a ray of regular (nonpolarized) light with a particular wavelength striking a transparent medium's reflecting surface (e.g., water or glass).

According to Brewster's law,

the angle of incidence at which the reflected light is totally polarized for reflection from air to glass is governed by the relation

n=tanθ

∴θ=tan −1n

Hence, the angle of incidence is θ=tan −1n.

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(a) To write a differential equation for H(t) using Newton's Law of Cooling, we can use the formula:

H'(t) = -k(H(t) - T_s)

where H'(t) represents the derivative of H with respect to time, k is the cooling constant, H(t) is the temperature of the juice at time t, and T_s is the temperature of the surrounding medium (mountain stream in this case).

The negative sign in front of the equation indicates that the temperature of the juice decreases over time.

(b) This is the differential equation. H(t) = (90 - T_s) * e^(-kt) + T_s

To solve the differential equation, we need initial conditions. In this case, we know that at t = 0, the temperature of the juice is 90 degrees F, so we have the initial condition:

H(0) = 90

Now, let's solve the differential equation:

H'(t) = -k(H(t) - T_s)

Separate variables and integrate:

1 / (H(t) - T_s) dH = -k dt

Integrating both sides:

∫1 / (H(t) - T_s) dH = -k ∫dt

ln|H(t) - T_s| = -kt + C

Exponentiate both sides:

|H(t) - T_s| = e^(-kt + C)

Since the absolute value can be eliminated, we can write:

H(t) - T_s = ± e^C * e^(-kt)

Let A = ± e^C, which is a positive constant. Therefore:

H(t) - T_s = A * e^(-kt)

Rearrange the equation:

H(t) = A * e^(-kt) + T_s

Now, we can apply the initial condition H(0) = 90:

90 = A * e^(-k * 0) + T_s

90 = A + T_s

A = 90 - T_s

Substituting A back into the equation, we have:

H(t) = (90 - T_s) * e^(-kt) + T_s

This is the solution to the differential equation. The value of k can be determined by using the given information about the temperature of the juice after 5 minutes (t = 5).

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Answer:

When an electromagnetic wave passes from space to matter, some part of the energy is absorbed by the matter and it increases its energy. The wave may reflect and some part may pass through the matter depending on the amount of energy they have. The amplitude of the wave decreases if some parts of it are reflected.

Electromagnetic radiation is one of the many ways that energy travels through space. The heat from a burning fire, the light from the sun, the X-rays used by your doctor, as well as the energy used to cook food in a microwave are all forms of electromagnetic radiation. While these forms of energy might seem quite different from one another, they are related in that they all exhibit wavelike properties.

The magnitude of the impulse that the plate gives to the bullet is 6.7 N

We know change in momentum horizontally = m v cos Ф2 - m u cos Ф1

and change in momentum vertically = m v sinФ2 - (- m u sinФ1)

where, m = mass = 20g = 0.02 kg

v = final velocity = 320 m/s

u = initial velocity = 350 m/s

Ф1,Ф2 = angle = 30 degrees

Putting these values we get,

Change in momentum horizontally = - 0.5196 kg-m/s

Change in momentum vertically = 6.700 kg-m/s

Magnitude of change in momentum is : \(\sqrt{-0.5196^{2} + 6.7^{2} } = 6.7 N\)

So the magnitude of the impulse that the plate gives to the bullet is 6.7 N

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The correct answer is b. The drift velocity is very slow, and typically describes a microscopic displacement over a period of a second.

The drift velocity refers to the speed at which electrons move through a wire under the influence of an electric field. It is a very slow speed, typically only a few millimeters per second, and is the result of the collisions that electrons experience with the metal atoms in the wire.

Electric current is the flow of electrons in a conductor, such as a wire. Individual electrons do not, however, move quickly through the wire. The average speed at which electrons flow across a wire while an electric field is present is referred to as the drift velocity.

Electrons frequently interact and shift direction because of collisions with other particles in the conductor. These collisions reduce their net movement and impede their total advancement. In comparison to the speed of individual electrons, the drift velocity is on the order of millimetres per second.

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Answer: 24 m/s

Explanation:

The total mechanical energy of the object at the highest point compared to its total mechanical energy at the lowest point is lesser. The correct answer is option A.

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The density of the unknown sample is 0.67 g/ml.

To calculate the density, we use the formula:

Density = Mass / Volume

Mass = 38.00 g

Volume = 56.39 ml

Substituting the values into the formula:

Density = 38.00 g / 56.39 ml

Dividing the mass by the volume, we find:

Density = 0.674 g/ml

Rounding to two decimal places, the density of the unknown sample is 0.67 g/ml.

Density is a measure of how much mass is contained within a given volume. In this case, we are given the mass of the unknown sample as 38.00 g and its volume as 56.39 ml. To find the density, we divide the mass by the volume. By performing the calculation, we obtain a density of 0.674 g/ml.

When rounding the value to two decimal places, the density of the unknown sample is 0.67 g/ml. This means that for every milliliter of the sample, there is 0.67 grams of mass. Density is an important property in chemistry and materials science as it can help identify substances and determine their behavior in various applications.

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The current flowing through a resistor at a constant temperature is directly proportional to the potential difference across it. This is called Ohm's law

Answer:

B

Explanation:

the force the elephant applies to the ball

Answer:

1.2 miles away

Explanan:

Seconds/five= Miles away

6/5=1.2

Answer:

El coeficiente de roce estático entre las dos superficies es 0.131.

Explanation:

El coeficiente de roce estático entre dos superficies (\(\mu_{s}\)), sin unidad, es igual a la fuerza de resistencia (\(F\)), en newtons, dividida por el peso del cuerpo a mover (\(W\)), en newtons.

\(\mu = \frac{F}{m\cdot g}\) (1)

Donde:

\(m\) - Masa, en kilogramos.

\(g\) - Aceleración gravitacional, en metros por segundo al cuadrado.

Si sabemos que \(F = 45\,N\), \(m = 35\,kg\) y \(g = 9.807\,\frac{m}{s^{2}}\), entonces el coeficiente de roce estático es:

\(\mu = \frac{45\,N}{(35\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)}\)

\(\mu = 0.131\)

El coeficiente de roce estático entre las dos superficies es 0.131.

Answer:6.4 meters eastward

Explanation: you’re displacement is supposed to be the distance of the initial position to the final position (where you started to where you finished) so that means you would have to subtract 9.2 by 2.8 to get 6.4, and because you subtracted from 9.2 the direction is eastward.

Hope I helped!

The team of engineers must first define the problem, Option A.

The term air quality has to do with the overall purity of the air in a certain locality. We know that the air in an area is affected by the activities of the people that reside in that vicinity.

In this case, the team of engineers must first define the problem before they can  improve local air quality in the community.

Missing parts;

A team of engineers is asked to help a community improve local air quality. What must the team do before it can begin to identify possible solutions?

answer choices

Iterate to improve the solution.

Define the problem.

Select one solution.

Model the solution.

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The concentration of the reactant has decreased from 0.150 M to 0.0537 M over the course of 19.5 seconds.

Reactants are chemicals that are present at the start of a chemical reaction and are consumed during the reaction to produce products.

The concentration of a reactant decreases over time as it reacts, and the rate at which it decreases depends on the reaction rate constant and the initial concentration.

In this case, the rate constant is 5.4 x 10⁻² s⁻¹, and the initial concentration is 0.150 M.

To find the concentration after 19.5 seconds, we can use the first-order reaction rate equation:

\(C = C_0e^{(-kt)}\)

Where C₀ is the initial concentration, k is the reaction rate constant, and t is the time elapsed.

Plugging in the values, we get:

\(C = 0.150 M \times e^{(-5.4 \times 10^{-2} s^{-1} \times 19.5 s)} = 0.150 M\times e^{(-1.049)}\)

Using a calculator, we can find that \(e^{(-1.049)}\) is approximately 0.354.

So, the concentration of the reactant after 19.5 s is:

C = 0.150 M x 0.354 = 0.0537 M

This means that the concentration of the reactant has decreased from 0.150 M to 0.0537 M over the course of 19.5 seconds.

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If the magma cools slowly, then the crystals have enough time to grow and become large.

If the growth does not experience any disturbance, then the mineral will have a perfect crystal form. But this perfect form is rarely found because in nature these disturbances are always there. Minerals that are found in nature often do not develop properly, making it difficult to classify minerals into crystallographic systems.

Instead the term crystal habit is used, the typical shape of a mineral is determined by the parts that form it, including the relative shape and size of these patches. We need to know some of the crystal stature found in certain types of minerals, so that the crystal stature can be used to determine the type of mineral, even though crystal stature is not a permanent characteristic of minerals.

Richard M Pearl (1975) divides crystal stature into 3 (three) groups, namely:

A. Elongated habits (long/streaky)

B. Flattened habits

C. Rounded habits (grain).

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Answer:

I believe it's B.

Explanation:

The force that a magnet exerts on certain materials, including other magnets, is called magnetic force. The force is exerted over a distance and includes forces of attraction and repulsion. North and south poles of two magnets attract each other, while two north poles or two south poles repel each other.

2,042.1 years time from now will we see it disappear.

d = 6.44. 3.10¹⁸ m,

v = 3.10⁸ m/s,

t = 6.44.3. 10¹⁸ / 3. 10⁸ s = 6.44 . 10¹⁰ sec.

Converting seconds to years:

6.44. 10¹⁰ sec . (1min/60 sec).(1h/60 min). (1d/24h)(1y/365d) = 2,042.1 years.

Physicists define time as the progression of events from the past through the present, and into the future. If a system doesn't change, it is effectively timeless. When describing events that take place in three-dimensional space, time may be seen as the fourth dimension of reality. We are unable to see, touch, or taste time, yet we can compute how much time has passed.

Everywhere in classical mechanics, time is constant. The timekeeping systems are still in sync. But as Einstein's special and general theories of relativity show, time is relative. It depends on the observer's perspective of view. The theory of time dilation states that when one approaches the speed of light, the intervals between events grow longer (dilates).

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Answer:

R = K L / A        resistance proportional to length and inversely proportional  

to area

R2 / R1 = A1 / A2 = A1 /  (4 A1) = 1 / 4

R2 = R1! / 4

Answer:

Humans naturally have what's known as binaural hearing, which is the ability to hear in two ears.