If the dark adapted eye has a pupil diameter of 7.0 mmmm , how many photons per second enter the eye from the star? assume the starlight has a wavelength of 550 nmnm .

D Solar tide

Explanation:

Because d is closer to the sun

Newton's law of universal gravitation states that every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

Newton's Law of Universal Gravitation states that every object with mass attracts every other object with mass. The force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. The key equation for Newton's Law of Universal Gravitation is:
F = G * (m1 * m2) / r2.
where F is the gravitational force, G is the gravitational constant, m1, and m2 are the masses of the objects, and r is the distance between their centers.

This is a general law of physics derived from experimental observations, which Isaac Newton called inductive reasoning. It is part of classical mechanics and was developed in Newton's book Philosophiæ Naturalis Principia Mathematica ("Principles of Mathematics"), first published on July 5, 1687. When Newton presented Volume 1, he did not report to the Royal Society in April 1686. Robert Hooke claimed that Newton took the right back from him.

In modern language, the law states that each element of the group attracts all other elements of the group with a force acting along a line where the two elements intersect. The force is proportional to the product of the two groups and inversely proportional to the square of the distance between them.

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A moon is defined as a natural satellite orbiting around a planet. It is a celestial body that orbits around a planet or a dwarf planet in our solar system. What makes a moon different from a planet is that moons do not orbit around the sun. They orbit around a planet or a dwarf planet instead.

In addition, moons are smaller than planets and do not have their own atmosphere. Moons can be rocky or icy and can be made up of different types of materials such as dust, rock, ice, and gas. They are formed through various processes such as accretion, collision, capture, and fission. Out of all the moons in our solar system, I think that the moon of our Earth is the most interesting.

The moon of the Earth is the only natural satellite of our planet. It is about one-quarter the size of the Earth and is about 238,855 miles away from the Earth. It has a rocky and dusty surface, with many craters, mountains, valleys, and seas. The moon has played an important role in the history of human civilization, serving as a source of light, a calendar, and an object of scientific study. It has been explored by humans and robots, revealing many secrets of its geology, composition, and history.

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Answer:

Radiation is classified as being either non-ionizing or ionizing. Non-ionizing radiation is longer wavelength/lower frequency lower energy. While ionizing radiation is short wavelength/high frequency higher energy. Ionizing Radiation has sufficient energy to produce ions in matter at the molecular level.

Answer:

distance- I think it is 6 then the displacement is 13.41

Explanation:

Answer:

S1

Explanation:

Has to be S1. This is pretty glaring to me. It's said from the question that the chemical reaction that took place is given by the following

S1 + G = S2, with S2 being an offspring of the first S1. When S1 got reacted, it broke down into S2, so, this only confirms that both S1 and E2 are S3 are compounds.

Answer:

Arm Workouts- with Weights.

Pushups for Upper-Body Strength.

Lunges and Squats.

Explanation:  Lifting weights is one way to build muscular strength and endurance in your arms.

Pushups primarily work the pectoral muscles of the chest, starting directly below the neckline.    

Brainlist please?       and your welcome!

The energy associated with the magnetic field of the solenoid can be calculated using the equation U = 1/2 * L where U is the energy, L is the inductance of the solenoid, and I is the current flowing through it L = u0 * N^2 * A / l where u0 is the permeability of free space (4π x 10^-7 T*m/A), N is the number of turns in the solenoid (179),

A is the cross-sectional area of the solenoid (which we can assume to be the same as the area of each turn, given as 3.74 x 10^-4 m^2), and l is the length of the solenoid (which we don't have, but we can assume to be much larger than the diameter of the solenoid to minimize end effects). Plugging in the values, we get L = (4π x 10^-7 T*m/A) * (179)^2 * (3.74 x 10^-4 m^2) / l  L = 0.014 T*m^2 / A  Now we can use this value and the given current to find the energy:  U = 1/2 * (0.014 T*m^2 / A) * (1.70 A)^2  U = 0.020 J  So the energy associated with the magnetic field of the solenoid is 0.020 joules I hope this explanation helps! Let me know if you have any further questions. the energy associated with the magnetic field of a solenoid.

1. First, let's find the total magnetic flux (Φ) in the solenoid by multiplying the magnetic flux per turn by the number of turns Φ = (3.74 × 10⁻⁴ T·m²/turn) × 179 turns = 0.066966 T·m² 2. Now, we need to find the inductance (L) of the solenoid using the formula Φ = L * I, where I is the current L = Φ / I = 0.066966 T·m² / 1.70 A = 0.03939 H (henry) 3. Finally, we'll calculate the energy (U) associated with the magnetic field using the formula U = 0.5 * L * I²: U = 0.5 * 0.03939 H * (1.70 A)² = 0.0567 J (joules) Since 1 J = 1000 mJ, the energy associated with the magnetic field of the solenoid is 0.0567 * 1000 = 56.7 mJ.

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Answer:

\( \boxed{\sf Distance \ travelled = 62.5 \ m} \)

Given:

Initial velocity (u) = 25 m/s

Final velocity (v) = 0 m/s (Rest)

Time taken (t) = 5 seconds

To Find:

Distance travelled by car (s)

Explanation:

From equation of motion of object moving with uniform acceleration in straight line we have:

\( \boxed{ \bold{s = (\frac{v + u}{2} )t}}\)

By substituting value of v, u & t in the equation we get:

\( \sf \implies s = ( \frac{0 + 25}{2} ) \times 5 \\ \\ \sf \implies s = \frac{25}{2} \times 5 \\ \\ \sf \implies s = 12.5 \times 5 \\ \\ \sf \implies s = 62.5 \: m\)

\( \therefore\)

Distance travelled by car (s) = 62.5 m

The distance  car travel during that time is 62.5 meter.

Acceleration is the rate at which speed and direction of velocity vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates.

Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration for all other motions.

Initial velocity (u) = 25 m/s

As the car becomes rest, final velocity (v) = 0 m/s (Rest)

Time taken (t) = 5 seconds.

The deceleration of the car: a = (initial speed - final speed)/time interval

= ( 25 m/s - 0 m/s)/5 second

= 5 m/s²

The distance  car travel during that time = ut - at²/2

= 25 × 5.0 meter - (5×5²/2) meter

= 62.5 meter.

Hence, the distance  car travel during that time is  62.5 meter.

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Answer: 1702.8 km/h

Explanation:

The speed of the molecule in kilometers per hour (km/h) will be, {473x(3600÷1000)} km/h

= 1702.8 km/h

Answer:

To be neutral

Explanation:

Neutrons are electrically neutral but contribute to the mass of a nucleus to nearly the same extent as the protons. Neutrons can explain the phenomenon of isotopes (same atomic number with different atomic mass). The main role of neutrons is to reduce electrostatic repulsion inside the nucleus.

Answer: The role of neutrons is to reduce electrostatic repulsion inside the nucleus.

Explanation:

Because they are neutral, so they help hold the nucleus together.

Answer:

B train!

Explanation:

A train travelled at 40 km/hr. (120/3)

B train traveled at 45 km/hr (180/4)

Answer:

Train B

Explanation:

Let's find each train's speed using the following formula.

\(s=\frac{d}{t}\)

where \(d\) is distance and \(t\) is time.

Train A

Train A travelled a distance of 120 kilometers in 3 hours.

\(s=\frac{d}{t}\\d=120 km\\t= 3hrs\)

Substitute the values into the formula and divide.

\(s=\frac{120km}{3hrs}\\\)

\(s= 40 km/hr\)

Train B

Train B travelled a distance of 180 kilometers in 4 hours.

\(s=\frac{d}{t}\\d=180 km\\t= 4hrs\)

Substitute the values into the formula and divide.

\(s=\frac{180km}{4 hrs}\\\)

\(s= 45 km/hr\)

45 kilometers per hour is greater than 40 kilometers per hour, so Train B travelled faster.

The highest order dark fringe for a 561 nm light incident on a 1420 nm wide slit is the 3rd order.

Diffraction occurs when light passes through a narrow opening or slit, causing the wave to bend and interfere with itself. The pattern of bright and dark fringes produced by this interference is called a diffraction pattern. The position of these fringes can be determined using the equation d sin θ = mλ, where d is the width of the slit, θ is the angle of diffraction, m is the order of the fringe, and λ is the wavelength of the light.

Using this equation, we can calculate that the 3rd order dark fringe corresponds to an angle of approximately 5.68 degrees for a 561 nm light incident on a 1420 nm wide slit. Therefore, the highest order dark fringe in this situation is the 3rd order.

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Answer:(:

Explanation:

discovered alpha and beta rays, and proposed the laws of radioactive decay.

Answer: Depth does not classify soils. Soil color and other properties including texture, structure, and consistence are used to distinguish and identify soil layers.

Happy to help! (0.<)

Explanation:

The depth parameter is  does not used to classify the soil in different region. Texture, color and structure are used to characterize the soil type.

The method of classifying soil involves dividing it into groups where the behaviors of the soils within each group are the same under a certain set of physical conditions.

Engineers can use soil classification to comprehend and evaluate a particular soil's performance and determine whether the soil is suitable for particular engineering applications.

The classification of soli include  based on grain size textural classification,  AASHTO classification system,  Unified soil classification system. AASHTO classification system is developed by  Bureau of Public Roads for the classification of soil for the highway subgrade use.

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Answer:

hydrochlorine +12÷B to the power of 4 -× y reapeated zminus 2 to the power of 9

The image formed by refraction is at a distance of 120cm behind the lens and its magnification is 4.

The image formation by refraction and magnification of an object in water 30 cm from the vertex of a convex surface made of plexiglass with a radius of curvature of 80 cm can be calculated using the following steps:

1. Determine the object's distance from the lens. Object distance (u) = -30 cm. (negative sign as per the convention of the mirror)

2. Determine the focal length of the lens using the formula:

f = R/2 where, f = focal length of the lens, R = radius of curvature of the lens.

So, f = 80/2 = 40 cm.

3. Use the mirror formula to determine the image distance from the surface:

1/f = 1/v + 1/u where,v = image distance from the surface.

Substituting the given values (with proper sign convention), we get:

(-1/40) = 1/v + (-1/30)

Solving for v, we get:

v = 120 cm.

5. Use the magnification formula to determine the magnification of the image:

m = -(v/u)

where,m = magnification, v = 120 cm, u = 30 cm

Therefore,m = -(120/-30) = 4

Therefore, the image will form at a distance of 120 cm from the lens on the water side of the lens and is magnified by a factor of 4.

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Answer:

Explanation:

The energy possessed by a moving object is called kinetic energy.M=1kgV=2m/sKe= 1/2MV^2Ke=1/2×1×(2)^2Ke =2 joules

Answer:

The reading of the Geiger counter, 22 minutes later = 29 counts per minute (cpm)

Explanation:

Half life is defined as the time taken for the amount ( or activity) of a substance to reduce to half its original value.

As stated in the question, the half life of Francium-233 is 22 minutes, \(t_{1/2} = 22 minutes\). This means that it takes 22 minutes for the activity of Francium-233 to reduce to half of its original value.

The original activity of Francium-233 =  58 counts per minute (cpm)

By the end of 22 minutes, the activity measured by the counter would have halved.

Activity of Francium-233 after 22 minutes = 58/2

Activity of Francium-233 after 22 minutes = 29 counts per minute (cpm)

To solve this problem, we need to use the concept of half-life. The half-life of a radioactive substance is the time it takes for half of the original amount of the substance to decay. In this case, the half-life of radon-222 is 3.83 days.

We can use the following formula to calculate the number of radon atoms left after a certain amount of time:

N = N0 x (1/2)^(t/T)

where N is the final number of radon atoms, N0 is the initial number of radon atoms, t is the time elapsed, and T is the half-life of radon-222.

Plugging in the given values, we get:

N = 5.00 × 10^10 x (1/2)^(100/3.83)

N = 1.20 x 10^8 radon atoms

Therefore, after 100 days, there will be approximately 120 million radon atoms left in the sample.

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A __rales ________ is an abnormal crackling, rattling, or bubbling sound heard on auscultation of the chest.

Rales are an abnormal sound heard accompanying the normal respiratory sounds on auscultation of the chest

Rales heard over the lung bases are a sign of  of heart failure that is of at least moderate severity. With acute pulmonary edema, rales are frequently accompanied by wheezing and expectoration of frothy, blood-tinged sputum.

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Answer:

C

Explanation:

There is a decrease in temperature and daylight and plants produce less food.

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The rhetorical device used by Sojourner Truth is rhetorical question.

Rhetorical device refers to the way an author uses to pass information to the listener, in order to persuade them to buy into his opinion.

For example, the phrase ain't I a woman, is repeated by the sojourner truth, in order to encourage the audience to think about the significance of the arguments that have been presented.

By asking this, Sojourner Truth encourages the audience to consider the treatment given to women, and in particular black women, and wonder whether it is fair.

The question is not meant to be answered, but instead it is meant to encourage the audience to reflect on a particular topic.

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Answer:

A subscript

Explanation:

it tells you how many oxygen molecules there are in the equation

If an electron vibrates back and forth in an clean wire with a frequency of 60.0 Hz, then it will make 2.2×10⁵ cycles. in 1.0 h. Hence option D is correct.

Electric charge is the physical property of matter that experiences force when it is placed in electric field. F = qE where q is amount of charge, E = electric field and F = is force experienced by the charge. there are two types of charges, positive charge and negative charge which are generally carried by proton and electron resp. like charges repel each other and unlike charges attract each other. the flow charges is called as current. Elementary charge is amount of charge a electron is having, whose value is 1.602 x 10⁻¹⁹ C

Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform. There are two types of the wave longitudinal wave and transverse wave.

Frequency is nothing but the number of oscillation in a unit time.

Given,

frequency f = 60.0 Hz.

time t = 1.0 h = 60*60 = 3600s

F = number of cycles/time

number of cycles = F×time

The number of cycles in 1 Hr is

60*3600 = 2.2×10⁵ cycles.

Hence option D is correct.

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Answer:

Sample Response: The data for the first part of the experiment support the first hypothesis. As the height of the cylinder increased, the temperature of the water increased. At a greater height, the cylinder has more gravitational potential energy. This gravitational potential energy was completely converted to thermal energy, which increased the temperature of the water.

Explanation:

this the sample response from ED mechanical equivalent of heat lab.

Answer:

Sample response:

Explanation:

The data for the first part of the experiment support the first hypothesis. As the height of the cylinder increased, the temperature of the water increased. At a greater height, the cylinder has more gravitational potential energy. This gravitational potential energy was completely converted to thermal energy, which increased the temperature of the water.

Answer:

she saw it in a movie

Explanation:

she said her mom and her saw it in Step up 3 and fell in love

Answer:

Consider electrons incident on a Young's double slit

If one slit is covered, the electrons will form a maximum, on the screen, as if they were particles incident on the screen

If both slits are open, the pattern formed on the screen will be the same as if a wave were incident on the screen, even tho electrons are slowed to the point that only 1 electron is incident on the screen at one time.

That means that the electron interferes with itself to create the  interference pattern on the screen, and there is no way to determine which slit the electron went thru without destroying the interference pattern.