A ball is dropped off the side of a bridge.
After 1.55 s, how far has it fallen?

Answer:1725 watts

Explanation: Household devices are required to run at 110-125 volts and most are rated at 115 volts so 1725 watts for a 15 amp cord or circuit. You will have to be careful when adding outlets for a 15 amp breaker. Always be sure to consult a licensed electrician before DIY electrical work.

The energy absorbed by the retina is approximately 3.31 x \(10^-^1^7\) joules per second under ideal conditions.

Under ideal conditions, the human eye can detect light with a wavelength of 620 nm and an absorption rate of 100 photons/s.

To find the energy absorbed by the retina, we use the formula E = nhf, where E is energy, n is the number of photons, h is Planck's constant (6.63 x \(10^-^3^4\) Js), and f is the frequency.

First, we need to find the frequency using the formula f = c/λ, where c is the speed of light (3 x \(10^8\) m/s) and λ is the wavelength.

The frequency is approximately 4.84 x \(10^1^4\) Hz.

Now we can calculate the energy absorbed: E = (100 photons/s)(6.63 x \(10^-^3^4\) Js)(4.84 x \(10^1^4\) Hz) = 3.31 x \(10^-^1^7\) J/s.

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Under ideal conditions, the retina absorbs energy at a rate of approximately 3.21 x \(10^{-17}\) Joules/s when detecting light with a wavelength of 620 nm.

Under ideal conditions, the human eye can detect light with a wavelength of 620 nm when at least 100 photons/s are absorbed by the retina. To calculate the rate of energy absorbed by the retina, we first need to find the energy of a single photon using the formula: E = (hc) / λ. Where E is the energy of a photon, h is Planck's constant (6.63 x \(10^{-34}\) Js), c is the speed of light (3 x \(10^{8}\) m/s), and λ is the wavelength (620 x \(10^{-9}\) m). E = (6.63 x \(10^{-34}\) Js) x (3 x \(10^{8}\) m/s) / (620 x \(10^{-9}\)m). E ≈ 3.21 x \(10^{-19}\) Joules. Now, we know the energy of one photon, and the retina absorbs 100 photons/s. To find the rate of energy absorbed by the retina, we multiply the energy of a single photon by the number of photons absorbed per second: Rate of energy absorbed = Energy per photon x Number of photons/s. Rate of energy absorbed = (3.21 x 10^-19 Joules) x (100 photons/s). Rate of energy absorbed ≈ 3.21 x 10^-17 Joules/s

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The momentum flow rate through the pipe carrying liquid ammonia is 1 × \(10^6\) kg·m/s.

The flow rate of momentum (Ṁ) through the pipe can be calculated by multiplying the mass flow rate (ṁ) by the velocity (v). The speed can be determined using the equation v = ṁ / (ρA), where ρ is the density of the liquid ammonia and A is the pipe's cross-sectional area.

Given:

ṁ = 100 kg/s

A = 0.01 m²

Assuming the density (ρ) of liquid ammonia is 700 kg/m³, we can calculate the velocity (v):

v = ṁ / (ρA)

v = 100 kg/s / (700 kg/m³ × 0.01 m²)

v = 10000 m/s

Now, we can calculate the flow rate of momentum (Ṁ):

Ṁ = ṁv

Ṁ = 100 kg/s × 10000 m/s

Ṁ = 1 × \(10^6\) kg·m/s

Therefore, the momentum flow rate through the pipe is 1 × \(10^6\) kg·m/s.

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Therefore, the acceleration of object 2 is 2.0 m/s².

When two objects are connected by a massless rod and a force is applied, the acceleration is different for each object. This is due to the differences in mass of each object.

The acceleration of the objects is related to the mass of the objects and the force applied to them. In this scenario, you are applying a 10.0-N force to two objects that are connected by a rigid, mass-less rod.

Object 1 has mass M and object 2 has mass 5M.

The acceleration of object 2 is calculated as follows:
To find the acceleration of object 2, we can use the equation F = ma.

Since the two objects are connected by a rigid, mass-less rod, they will both accelerate at the same rate.

This means that the acceleration of object 1 will be the same as the acceleration of object 2.

Let a be the acceleration of both objects.

F = ma

For object 1, we have:

10.0 N = M * a
a = 10.0 N / M

For object 2, we have:
10.0 N = 5M * a
a = 10.0 N / 5M
a = 2.0 N / M

Since the acceleration of both objects is the same, we can set the two equations equal to each other:
10.0 N / M = 2.0 N / M

This simplifies to:
a = 2.0 m/s²

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Answer:

12 metre

Explanation:

Wavelength = Velocity / Frequency

Wavelength = 300m/s / 25 Hz

Wavelength = 12 metre

There are 40 electrons in Zr.

The number of electrons in the element Zirconium (Zr) is 40. In the periodic table, Zr is located in period 4 and group 4 (also known as group IV), and it has an electron configuration of [Kr] 4d2 5s2. This means that it has two electrons in its 4d orbital and two electrons in its 5s orbital, giving it a total of 40 electrons.

We have to note that number of the protons in the nucleus would also be the number of the electrons that we can be able to find in the neutral atom.

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Answer:

This will require 266.9 of heat energy.

Explanation:

To calculate the energy required to raise the temperature of any given substance, here's what you require:The mass of the material, m The temperature change that occurs,  ΔT The specific heat capacity of the material,

c

(which you can look up). This is the amount of heat required to raise 1 gram of that substance by 1°C.

Here is a source of values of

c for different substances:

Once you have all that, this is the equation:

Q=m×c×ΔT(Q is usually used to symbolize that heat required in a case like this.)For water, the value of c is 4.186g°C So, Q=750×4.186×85=266=858=266.858

Answer: +20N

Explanation:

First we look at our given information. You are finding the sum of the forces on the ball and they already give you the magnitude and direction of the forces. This means we can disregard the mass (1kg) of the ball and what the forces are from (gravity and floor pushing on the ball). The only things that matter are magnitude and direction.

Now we have to give each force either a positive or negative sign. I am assuming we are using the ground as a frame of reference. When we move towards a frame of reference, the sign is negative. When we move away from a frame of reference. This means that the upward vector will have a positive sign (+30N) and the downward vector will have a negative sign (-10N).

Now all we have to do is add the two together:

+30 + (-10) = +20

All done!!

If the bullet achieves a speed of 220 m/s as a result of this impluse given to it in the barrel of a gun, so the equation of mass is m = (FΔt) / v.

Impulse is a vector quantity defined as the product of force and the time interval over which the force acts on an object. It represents the change in momentum of an object and is given by the equation:

Impulse = Force * Time

Impulse can also be expressed as the integral of force with respect to time:

Impulse = ∫ F dt

The unit of impulse is newton-second (Ns) or kilogram-meter per second (kg·m/s). Impulse is directly related to the change in momentum experienced by an object. According to the principle of impulse-momentum, the impulse applied to an object is equal to the change in its momentum.

The formula for impulse is given as:

I = FΔt

where

I is impulse

F is the force

Δt is the change in time

According to Newton's second law, the force acting on an object is equal to the mass of the object multiplied by its acceleration.

F = ma

Where F is force,

m is mass,

and a is acceleration.

Rearranging the formula:

F/m = a

Now, we can substitute a = Δv/Δt,

where a is acceleration, Δv is change in velocity and Δt is change in time.

F/m = Δv/Δt

Rearranging this formula gives:FΔt = mΔvOrΔp = mΔvwhere Δp is the momentum.

Impulse (I) is the change in momentum (Δp).

Thus:

I = Δp

We can rewrite this as:

FΔt = mΔv

Given data:

Speed (v) = 220 m/s

Impulse (I) = Δp

Δp = mv - 0 = mv

Where m is the mass of the bullet.

We know that,

I = Δp

I = mv

220 m/s is the speed achieved by the bullet and we need to find the mass m.

Therefore,

m = I / v

Now, we can find impulse by using the formula for impulse:

Δp = mv - 0 = mv

I = Δp = mv

I = m * v

Substitute the given values in the formula to get the mass of the bullet.

I = m * v

m = I / v

m = (FΔt) / v

From the given data, we don't know either force or change in time. Thus, the mass of the bullet cannot be calculated. Therefore, the mass of the bullet cannot be determined using the given data.

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Answer:

The oxygen atom shares one pair of valence electrons with each hydrogen atom.

Explanation:

Answer:

Yes, in case of uniform velocity

Explanation:

This is the case of uniform velocity. If a body covers equal displacement in equal intervals of time, then the velocity of a body is said to be ‘Uniform Velocity’. It meas that the velocity of a body remains constant during the motion and it does not change.

Since, acceleration is defined as the rate of change of velocity.

Therefore, if there is no change in velocity or in other words the change in velocity is zero, then the acceleration is also zero.

a = ΔV/t = 0/t

a = 0 m/s²

So, the acceleration of the body is 0 m/s², but it has a uniform velocity

Hence, it is possible for an object that, object with zero acceleration have velocity, which is the case case of uniform velocity.

The pattern for starting at 0, multiplying by 2, and then adding 2 is an arithmetic sequence.

An arithmetic sequence is a sequence of numbers where each term is found by adding or subtracting a constant value from the previous term. In this case, the constant value is 2 since we are multiplying by 2 and adding 2 each time.

To describe the sequence, the first term is 0. To find the second term, we multiply the first term (0) by 2 and then add 2, giving us 2. To find the third term, we multiply the second term (2) by 2 and then add 2, giving us 6. Continuing in this way, we get the sequence: 0, 2, 6, 14, 30, 62, and so on.

Therefore, the pattern for starting at 0, multiplying by 2, and then adding 2 is an arithmetic sequence with a common difference of 2.

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Answer:

Boron

Explanation:

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The answer is true!!!!!!!!!!!

Answer:

B -- a single electron or one of two or more electrons in the outer shell of an atom that is responsible for the chemical properties of the atom.

Explanation:

Hope this helps! Please let me know if you need more help or think my answer is incorrect. Brainliest would be MUCH appreciated. Have a wonderful day!

The electrons in the outermost shell available for bonding are known as valence electrons. Therefore, option (B) is correct.

Valence electrons can be described as the electrons occupying the valence shell or outermost shell of an atom while the electrons filled in the inner shell are known as core electrons. Lewis structures can be helpful to evaluate the valence electrons and know the nature of bonds.

Valence electrons can be filled in several electron shells and these electrons participate in the interaction between atoms and lead to the formation of bonds.

Only electrons filled in the outermost or valence shell can participate in the formation of a chemical bond and set the trend of the reactivity of the element. Valence electrons participate in bonding to achieve the noble gas configuration.

Therefore, valence electrons are the electrons in the outermost shell available for bonding.

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Answer:

1.98 kg/m

Explanation:

5.94 divided by 3.00

When constructing a Keplerian telescope, the image formed by the objective lens is located at its focal point. This focal point is located at a specific distance from the lens,

which depends on the curvature of the lens and its refractive index.

The eyepiece lens of the Keplerian telescope is placed in such a way that it is positioned at the focal point of the objective lens.

When light from an object enters the objective lens, it is refracted and focused to form an image at the focal point.

This image is a real image, which means that the light rays converge at a point and can be projected onto a screen or observed directly.

However, in the Keplerian telescope, the eyepiece lens is placed at the focal point of the objective lens.

The eyepiece lens then magnifies this image, allowing the observer to see it in more detail. The magnified image is also located at the focal point of the eyepiece lens.

Since the eyepiece lens is also a converging lens, it refracts the light rays that form the image and focuses them to form a second image. This second image is virtual,

which means that it appears to be located behind the eyepiece lens and cannot be projected onto a screen. Instead, the observer sees the virtual image when looking through the eyepiece.

The reason why the image formed by the eyepiece lens is not a point but instead is focused to a specific location is because the eyepiece lens has a finite size and is not a perfect lens.

As a result, the light rays that pass through different points on the objective lens are not all perfectly aligned and do not all converge at the exact same point on the eyepiece lens.

This causes the image to be slightly blurred and spread out over a small area, rather than being focused to a single point.

Overall, the image formed by the objective lens of a Keplerian telescope is located at its focal point,

but the image formed by the eyepiece lens is slightly blurred and spread out over a small area due to imperfections in the lens.

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Answer it scapes away loose anf rough pieces of wood

Explanation:

Answer:

To achieve a nice smooth finish, it's essential to sand to help prepare the area for painting application, by sanding you are removing imperfections (also known as pimples), creating a nice smooth finish while at the same time adding adhesion by developing small, rough ridges for the paint to stick to.

Using the right sandpaper can make all the difference in a woodworking, painting, or finishing project; but choosing between the many different types of sandpaper that are available can be a challenge. Here are some tips on how to choose the best sandpaper for your next project.

Explanation:

Sry if this is wrong :(

Answer:

Constant variable: SAME TYPE OF BREAD (Wonder whole wheat), SAME AMOUNT OF WATER (5ml), SAME SIZE OF BREAD SLICE, SAME TEMPERATURE (75°F)

Independant variable: COLORS OF PLASTIC WRAP

Depentant variable: TIME FOR BREAD TO MOLD

Explanation:

In any experiment, the independent variable is the variable that is deliberately changed or manipulated by the experimenter. In this case, the independent variable is the DIFFERENT COLORS OF PLASTIC WRAP USED (red, orange, yellow, green, blue, and purple).

Dependent variable is the variable that the experimenter measures in an experiment. It is the variable that responds to changes made to the independent variable. In this experiment, the dependent variable is the TIME IT TAKES FOR BREAD TO MOLD.

Constant variable, also known as Controlled variable, is the variable that the experimenter keeps constant or unchanged for all groups throughout the experiment. In this experiment, the constants are: SAME TYPE OF BREAD (Wonder whole wheat), SAME AMOUNT OF WATER (5ml), SAME SIZE OF BREAD SLICE, SAME TEMPERATURE (75°F)

Answer:

1.33m/s

Explanation:

Given parameters:

M1  = 20kg

V1  = 2m/s

V2 = 0m/s

M2  = 10kg

Unknown:

V  = ?

Solution:

As with all systems, the momentum must be conserved and it implies that the starting and ending momentum be the same.

  M1 V1  +  M2 V2  = V (M1 + M2)

M1 is the mass of the big red fish

V1 is the velocity of the big red fish

V2 is the velocity of the green fish

M2 is the mass of the green fish

V is the velocity after swallowing

           (20 x 2) + (10 x 0)  = V (20 + 10)

                      40  = 30V

                      V  = 1.33m/s

Answer: 31N

Explanation:F = m x a

F = 8.5 x 3.7

F = 31.45

F = 31 (rounded)

F = 31 N

The length of the runway where the light plane reaches the speed of 34m/s is 385.22 meters

The speed of the light plane is 34 m/s

The acceleration of the light plane is 3 m/s²

The length of the runway can be found by solving both acceleration and velocity, we will obtain the time taken and length of the runway.

             Acceleration, a = v / t

where v is the velocity

           t is the time taken

Let us substitute the known values, we get

                             3 = 34 / t

                             t = 34 / 3

                                = 11.33 s

Thus, the time taken to cross the runway is 11.33 seconds

              Then, the velocity, v = L/t

 where L is the length of the runway

             t is the time taken.

Let us substitute the known values, we get

                             34 = L / 11.33

                               L = 34 x 11.33

                                   = 385.22 meters

Therefore, the length of the runway is 385.22 meters

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a) The angular separation between the central maximum and an adjacent maximum is 1 radian.

b) The distance between the adjacent maxima on the screen 50.0 cm from the slits is 0.5 cm.

(a) The angular separation between the central maximum and an adjacent maximum in a double-slit arrangement is given by:

θ = λ/d

where θ is the angular separation, λ is the wavelength of the light, and d is the distance between the slits.

Substituting the given values, we get:

θ = (100λ)/d = (100λ)/(100λ) = 1 radian

(b) The distance between the maxima on a screen at a distance L from the slits is given by:

y = (mλL)/d

where m is the order of the maximum (m = 1 for adjacent maxima), λ is the wavelength of the light, and d is the distance between the slits.

Substituting the given values, we get:

y = (1λ×50.0 cm)/d = (50.0 cm)/100 = 0.5 cm

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Answer:

The answer to the equation is B hope this helps:)

Answer:

D. a continent covered in snow can be one of the driest on earth

Explanation:

The long time will decrease the velocity which will equally decrease the impulse applied to your knee.

The impulse experienced by an object is the change in momentum of the object.

J = ΔP = m(v - u)

where;

v = distance / time

when time of fall becomes 3 times long, the final velocity becomes 3 times smaller

Since the velocity will be reduced, the impulse applied to your knee will decrease as well.

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Answer:

what are semimoval joints

When blowing across the top of an empty bottle, a relatively loud sound can be created because a standing wave occurs in the bottle. A standing wave is formed when a wave interferes with its reflected wave, creating points of constructive and destructive interference. The resonance of the standing wave amplifies the sound.

As the bottle is filled with water, the pitch of the sound becomes higher. This happens due to the change in the effective length of the air column inside the bottle. When the bottle is empty, the entire length of the bottle is available for the formation of the standing wave. This means that the air column inside the bottle is longer, resulting in a lower pitch.

As water is gradually poured into the bottle, the effective length of the air column decreases. This happens because the water occupies space inside the bottle, effectively reducing the available length for the standing wave. With a shorter effective length, the wavelength of the standing wave decreases.

According to the wave equation (speed = frequency x wavelength), if the speed of sound remains constant, a shorter wavelength leads to a higher frequency and, therefore, a higher pitch. By filling the bottle with water, we are effectively shortening the length of the air column and increasing the frequency of the standing wave, resulting in a higher-pitched sound.

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Rather than issue an electrical signal over the cable as twisted pair cable testers do, a fiber optic cable transmits light-based signals of different wavelengths.

A fiber-optic cable, also known as an optical-fiber cable, is an assembly similar to an electrical cable but containing one or more optical fibers that are used to carry light. The optical fiber elements are typically individually coated with plastic layers and contained in a protective tube suitable for the environment where the cable is used. Optical fiber consists of a core and a cladding layer, selected for total internal reflection due to the difference in the refractive index between the two. In practical fibers, the cladding is usually coated with a layer of acrylate polymer or polyimide. Different types of cable are used for optical communication in different applications, for example, long-distance telecommunication or providing a high-speed data connection between different parts of a building.

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Answer:

\(\boxed {\boxed {\sf 100 \ Newtons}}\)

Explanation:

We are asked to calculate the force you are applying to a car. According to Newton's Second Law of Motion, force is the product of mass and acceleration. Therefore, we can use the following formula to calculate force.

\(F= m \times a\)

The mass of the car is 2000 kilograms and the acceleration is 0.5 meters per second squared.

Substitute the values into the formula.

\(F= 2000 \ kg \times 0.05 \ m/s^2\)

Multiply.

\(F= 100 \ kg *m/s^2\)

Convert the units. 1 kilogram meter per second squared is equal to 1 Newton. Our answer of 100 kilogram meters per second square is equal to 100 Newtons.

\(F= 100 \ N\)

You apply 100 Newtons of force to the car.