An object that can push
or pull on iron without
touching it is called a:

Answer:

A

Explanation:

potential energy is energy due to position

Solution :

Given :

Wavelength of the thin beam of light, λ = 50 μm

Distance of the screen from the slit, D = 3.00 m

Width of the fringe, Δy = ±8.24 mm

Therefore, width of the slit is given by :

[tex]$d=\frac{n \lambda D}{\Delta y}$[/tex]

  [tex]$=\frac{2 \times 50 \times 10^{-9} \times 3}{2 \times 8.24 \times 10^{-3}}$[/tex]

  = 0.000018203 m

  = 0.0182 mm

  = 0.018 mm

The intensity of light is given by :

[tex]$I=I_0\left(\frac{\sin \beta /2}{\beta/ 2}\right)^2$[/tex]   , where [tex]$\beta=\frac{2 \pi D \sin \theta}{\lambda}$[/tex]

[tex]$I=I_0\left(\frac{\sin \frac{\pi d \sin \theta}{\lambda}}{\frac{\pi d \sin \theta}{\lambda}}\right)^2$[/tex]

[tex]$I=I_0\left(\frac{\sin \frac{\pi d y}{D\lambda}}{\frac{\pi d y}{D\lambda}}\right)^2$[/tex]

Now, [tex]$\frac{dy}{D \lambda} = \frac{8.24 \times 10^{-3}\times 0.018 \times 10^{-3}}{4 \times 50\times 10^{-9}\times 4}$[/tex]

               = 0.1854

               ≈ 0.18

[tex]$I=I_0\left(\frac{\sin 0.56}{0.56}\right)^2$[/tex]

  [tex]$=I_0 \times 0.81$[/tex]

  = 2  x0.81

  [tex]$= 1.62 \ W/m^2$[/tex]

Answer:

A. f = 8 Hz

B. T = 0.125 s

C. λ = 0.0166 m = 16.6 mm

D. d = 7.98 m

Explanation:

A.

The frequency of the wave can be given as:

[tex]f = \frac{n.\ of\ waves}{time}\\\\f = \frac{360}{45\ s}\\[/tex]

f = 8 Hz

B.

The time period will be:

[tex]T = \frac{1}{f}\\\\T = \frac{1}{8\ Hz}\\[/tex]

T = 0.125 s

C.

The wavelength is given as:

[tex]\lambda = \frac{c}{f}\\\\\lambda = \frac{0.133\ m/s}{8\ Hz}[/tex]

λ = 0.0166 m = 16.6 mm

D.

The distance traveled in 1 minute can be found out as follows:

[tex]c = \frac{d}{t}\\\\d = c\ t\\d = (0.133\ m/s)(60\ s)[/tex]

d = 7.98 m

Answer:

light bounces off the mirror

Explanation:

I think the answer is c because the image is shown on the same side as the object

The Diagram that involves a virtual image is the third diagram  ( C )

The third diagram involves a virtual image because it has its Image on the same side as the object as seen from the description :

The convex lens is centered at 7cm and the object is located at 6cm while the Focal points are 5.5 and 8.5 cm  

and the Image is formed at 4 cm ( on the same side/ half  of the Ruler ).

For a real image to be formed the Image will appear behind the position of the convex lens as seen in the diagram attached below and in Diagrams A and B .

Hence Diagram C shows that the Image is a virtual image

Learn more of convex lens : https://brainly.com/question/12323990

Hello. You did not present the photos to which the question refers, which makes it impossible for your question to be answered. However, I will try to help you in the best possible way.

Your question informs us that the photos are of a star-forming molecular cloud. The molecular cloud has dust, especially when the star is forming. In this case, we must keep in mind that in photos taken in visible light, the dust is able to appear, especially in space, where this dust would not reflect light, unlike the star in formation. In this case, we can conclude that in the case of the photo taken in visible light, we could see the molecular cloud as a dark spot, due to the dust. However, it would not be possible to view it in a photo taken with infrared light.

solute + solvent = a solution

I found a really good image for this situation:

Answer:

  f = 409.6 Hz,  the woman hears a higher frequency sound

Explanation:

This is a Doppler effect problem, which is described by the equation for the case of a fixed observer

          f = fo [tex]\frac{v}{v \pm v_s}[/tex]

where the negative sign is for the source approaching the observer

in this case the car is the one that emits the sound and moves away from the intersection

let's calculate

          f = 400  [tex]\frac{343}{343-8}[/tex]

          f = 409.6 Hz

therefore the woman hears a higher frequency sound

Explanation:

when a Rubber Balloon is rubbed against human hair, electrons are transferred from the hair to the rubber, giving the balloon a net negative charge and leaving the hair with a net positive charge .As the balloon is pulled away,the opposite charge on the hair causes it to be attracted the balloon

Answer:

b

Explanation:

it melts yes but it's still water [same element] so there fore it's a physical change

Answer:

It does not change the chemical composition of water. Explanation: A physical reaction is defined as the reaction in which a change in shape, size takes place. No new substance gets formed in these reactions.

Explanation:

Hope this helped

Answer: There is no such thing as devolution from a biological standpoint. The idea that humans might regress or "develop" assumes that there is a preferred hierarchy of structure and function, such as lungs being preferable to breathing with gills.

Answer:

Assimilation refers to the process by which a person or ethnic group that constitutes a minority people imitates the culture of the majority population and, when the process is complete, completely abandons its own culture. Thus, the original cultural differences disappear and society becomes a monoculture. For example, immigrant groups or colonized indigenous peoples may abandon their culture, either spontaneously or after religious persecution and coercive measures, called assimilation policies.

A number of immigrant groups were assimilated into American society during the 19th century in what is usually described as a cultural melting pot or Americanization. In this case, the adaptation was not one-way, and largely spontaneous.

Answer:

v = 8.0 m/s

Explanation:

The diagram clearly shows that the string is vibrating in the 5th harmonic. Hence, the length of string in terms o wavelength can be given as:

[tex]L = \frac{5}{2}\lambda\\\\\lambda = \frac{2}{5} L[/tex]

where,

λ = wavelength = ?

L = Length of string = 1 m

Therefore,

[tex]\lambda = \frac{2}{5}(1\ m)\\\\\lambda = 0.4\ m[/tex]

Now, the speed of the wave can be given by the following formula:

[tex]v = f\lambda\\[/tex]

where,

v = speed of wave =?

f = frequency of wave = 20 Hz

Therefore,

[tex]v = (20\ Hz)(0.4\ m)\\v = 8\ m/s\\[/tex]

Hence, the correct answer is:

v = 8.0 m/s

[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\blue{sw}}{\pink{er}} {\color{blue}{:}}}}}[/tex]

Elements are one type of atom.

Elements are complete chemical substances which relate to a single entry in the modern periodic table. Elements consist of one kind of atoms only.

Answer:

D

Explanation:

Answer: A person can weigh differently at various place on Earth because of the fluctuations in Earth's gravity, according to a new high-resolution map. ... Earth's gravity is weaker at the equator due to centrifugal forces produced by the planet's rotation

Explanation:

Answer:

Periods indicate that a new period at a new principal energy level which is filled with electrons. Groups indicate that the elements share similar properties because their shells are filled with the same number of valence electons.

Explanation:

e see that starting at period 2 Li has a  +1 charge , He has +2 charge, B has +3 charge, C has the potential to have a +4 charge or -4 charge (because it can gain or loose electrons) and N has a -3 charge, etc. Groups however, have similar properties and every element in a 1A - 8A has the same number of valence electrons. All except the noble gases in which He only needs 2 electrons to be in a perfect state. This is its octet as it would be a completely different element if it had more than 2 electrons in its shell. An example of the groups sharing similar properties is if we were to look at group 1A. In group 1A we find H, Na, K, etc. These are all highly unstable elements when alone (not in a compound) and they are very reactive. If you were to put Na for instance in water, it would light up and you'd see a flame sitting on top of the water. A scientist could do that with the rest of the elements in the group and they would see this increasing in reactivity as you go down the periods. Francium isn't visible long enough to be able to see this happen though. It's more of that kind of element that scientists prove that it exists, but not a very common element to get to learn much about.

Answer:

pitch

Explanation:

Answer:

yes

Explanation:

After the Earth, Mars is the most habitable planet in our solar system due to several reasons: Its soil contains water to extract. It isn't too cold or too hot. ... Gravity on Mars is 38% that of our Earth's, which is believed by many to be sufficient for the human body to adapt to.

Answer:

i would pick c

Explanation:

because, w and y it is very bright and bright can be very conductive like it said.

Answer:

D. Cooler

Explanation:

The Sun's surface has a temperature ranging from 6 000 Kelvin, thus it is very hot. The radioactive reaction in the core of the Sun is a nuclear fusion reaction. This reaction ensures continuous release of high energy from the surface of the Sun.

But during the reaction, some parts becomes cooler than other parts on its surface. Which is due to the release of high amount of energy into space. The Sun's spot can be found in the cooler part of the Sun.

Answer:

C. Cooler

Explanation:

Answer:

Efficiency in general means How well an object does with respect to its designated purpose for example a battery with Voltage of 10 volts won't exert 10 volts but slightly less due to internal resistance let's say 8V so efficiency will be 8/10 x100 = 80%

Same thing with a machine/engine If an engine is designed to produce 150 horsepower it won't give you the full energy due to part of the energy being dissipated in form of heat due to friction so let's say 145 hp is produced which is 96% efficiency

Answer:

do u have a picture of the question?

Explanation:

it would be easier to solve

The current is increased by a factor of 8.

From 18/35 A. to 144/35 A.

The electric current changes from 0.514 ampere to 4.14 ampere, i.e, electric current flow in the circuit increases 8 times.

A stream of charged particles, such as electrons or ions, travelling through an electrical conductor or a vacuum is known as an electric current. The net rate of electric charge flowing through a surface or into a control volume is how it is calculated.

Initial electric current flowing through the circuit = (18 volt ÷ 35 ohms)

= 0.514 ampere.

When the initial voltage of 18 V is doubled, and the initial resistance of 35 Ohms is reduced by a factor of 4, electric current flowing through the circuit will be = (2 × 18 volt )÷ (35 ohms÷4)

= 4.114 ampere.

Hence, electric current changes from 0.514 ampere to 4.14 ampere, i.e., electric current flow in the circuit increases 8 times.

Learn more about electric current here:

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Answer:

B because the earth rotational axis tilt away from the sun.

Because that's what "uniform velocity" means.

Uniform velocity means constant speed in a straight line.

Acceleration means changing speed OR changing direction.

Answer:

the answer is b i think

Answer:Within an individual organism, the specific combination of alleles for a gene is known as the genotype of the organism, and (as mentioned above) the physical trait associated with that genotype is called the phenotype of the organism.

Explanation:

The phenotype is the trait those genes express. ... Looking at the possible offspring, each box (or possible offspring) has two copies of the dominant gene. This means there is a 100% chance of the offspring having brown eyes, or being BB. It's important to note here that each box represents a possible offspring.

Answer:

See solution below

Explanation:

Complete question

The velocity of a particle is described by an equation v= ct + dt²

where c = 0.1 m/s and d = 0.02 m/s. Calculate:

(i) the change in velocity during the time interval t = 3 seconds and

t = 6 seconds.

(ii) the average acceleration in that same time interval

Substitute the value of c and d into the equation to have

v= ct + dt²

v = 0.1t+0.02t²

The velocity at the = 3secs will be expressed as:

V(3) = 0.1(3)+0.03(3)²

v(3) = 0.3+0.27

V(3) = 0.57m/s

When t =6secs

V(6) = 0.1(6)+0.03(6)²

v(6) = 0.6+1.08

V(6) = 1.68m/s

Change in velocity = v(6)-v(3)

Change in velocity = 1.68-0.57

Change in velocity= 1.11m/s

B) Acceleration is the rate of change in velocity

A(t) = dv/dt

A(t) = c+2dt

A(t) = 0.1+2(0.02)t

A(t) = 0.1+0.04t

If t = 3

A(3) = 0.1+0.04(3)

A(3)= 0.1+0.12

A(3) = 0.22m/s²

A(6) = 0.1+0.04(6)

A(6)= 0.1+0.24

A(6) = 0.34m/s²

Average acceleration = 0.34-0.22

Average acceleration = 0.12m/s²