Answer:current
Explanation:water flows down a river. Current flows down a wire (in the drude model, at least)
Answer:
electricity
Explanation:
Who is responsible of refraction light 1/3 in eye
The cornea is responsible of refraction light 1/3 in eye.
What is the function of the cornea?In addition to the protective function, it plays a fundamental role in the formation of vision. Transparent, it works like a lens over the iris, focusing light from the pupil towards the retina.
Normally, the cornea and lens deflect (refract) incoming light rays, focusing them on the retina. The shape of the cornea is fixed, but the lens changes shape to focus on objects at different distances from the eye.
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Which action can humans take to reduce wave erosion?
build drainage systems
build houses near coastlines
build breakwaters in the ocean
reduce vegetation along coastlines
The action that humans can take to reduce wave erosion is to build breakwaters in the ocean.
What is erosion?The term erosion has to do with the washing away of top soil either by water or by wind. The control of erosion is a very important soil conservation effort.
Hence, the action that humans can take to reduce wave erosion is to build breakwaters in the ocean.
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Answer: (C) build breakwaters in the ocean
Explanation: Got it on edge
what is the difference between an sa and an sb galaxy? (select all that apply.)
The difference between an sa and sb galaxy is Sa has a larger nucleus and more tightly wound arms than an Sb.
What is sa Galaxy?Sa galaxies are normal spirals that have narrow, tightly wound arms, which usually are visible because of the presence of interstellar dust and, in many cases, bright stars.
What is sb Galaxy?The arms of sb galaxy are more widely spread than those of the Sa variety and appear less smooth.
Thus, the difference between an sa and sb galaxy is Sa has a larger nucleus and more tightly wound arms than an Sb.
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When you see a quantity like 20 m/s N, how do you know that it's a vector quantity and not a scalar quantity?
We know that 20 m/s N is a vector quantity because N in the expression signifies the direction
What is a vector quantity?This is a which have both magnitude and direction. Example include:
VelocityDisplacementForceAccelerationMomentWeightHow to determine whether 20 m/s N is a vector quantity20 m/s indicates just the speed i.e magnitude20 m/s N indicates the speed i.e magnitude why the N indicates the direction.Thus, we can conclude that 20 m/s N is a vector quantity because it has both magnitude and direction.
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Cancer and diabetes are two common hereditary diseases.
It is a true statement that cancer and diabetes are two common hereditary diseases.
What are hereditary diseases?The term hereditary diseases are those diseases that occur in parents and could also be found in their offspring. For many of these hereditary diseases, the mechanism of inheritance is unclear.
However, it is a true statement that cancer and diabetes are two common hereditary diseases.
Missing parts:
Cancer and diabetes are two common hereditary diseases. A. True B. False.
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one of the rare galaxies that is isolated in space is likely to be a(n) ____.
The rarest type of galaxies is the elliptical double-ringed galaxy.
What is the rarest type of galaxy?elliptical double-ringed galaxy is considered as the rarest type of galaxy because of its small number. The example of such type of galaxy is PGC 1000714. Scientists suggest that about 0.1% of galaxies are of this type.
So we can conclude that the rarest type of galaxies is the elliptical double-ringed galaxy.
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A 1.0-g string that is 0.64 m long is fixed at both ends and is under tension. This string produces a 100-Hz tone when it vibrates in the third harmonic. The speed of sound in air is 344 m/s. The tension in the string is closest to
The tension in the given string of 1.0 g and length of 0.64 m is closest to 2.84 N
Tension in the string
The tension in the string at nth harmonic is calculated as follows;
[tex]f_n = \frac{n}{2l} \sqrt{\frac{T}{\mu} }[/tex]
where;
n th harmonic = 3L is length of the string = 0.64 mμ is mass per unit length = (1 x 10⁻³ kg)/(0.64 m) = 0.00156 kg/mf is frequency = 100 HzT is tension in the string = ?[tex]f_n = \frac{n}{2l} \sqrt{\frac{T}{\mu} }\\\\\frac{f_n(2l)}{n} = \sqrt{\frac{T}{\mu} }\\\\\frac{f_n^2(4l^2)}{n^2} = \frac{T}{\mu} \\\\T = \mu (\frac{f_n^2(4l^2)}{n^2})\\\\T = 0.00156(\frac{100^2 \times 4\times 0.64^2}{3^2} )\\\\T = 2.84 \ N[/tex]
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Which of the following is an example of an electromagnetic wave?
Sound
Ocean waves
Seismic waves
Red light
Answer:
red light light is an electromagnetic wave thats whyy
hope it helped
Explanation:
When the humerus moves in the glenoid fossa, the moving joint surfaces are:
When the humerus moves in the glenoid fossa, the moving joint surfaces are convex on concave.
What is Glenoid fossa?This is a bone depression in which the head of the humerus fits into to aid movement and support.
The moving joint surfaces are convex on concave in structure when humerus moves in the glenoid fossa.
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I finished all my other questions but i don't know how to do this one. could someone help me? I added a lot of points because I know this is pretty complicated.
Explanation:
hope it will help you understand, if you have any questions just let me know.
draw suitable diagrams where necessary
1. describe an experiment for the measurement of specific heat capacity of a liquid by principle of mixtures
The experiment is described below in the explanation.
What is specific heat?The specific heat is the amount of heat required to change the temperature by 1°C. It is denoted by C.
Heat lost or gained is represented as
Q = m C ΔT
In a calorimeter, a liquid is filled into the the cup with a temperature. A rod with high temperature is inserted into that liquid.
We use principle of mixture by putting a heated rod in a liquid and then measuring the rise of temperature of liquid.
So, heat is lost by rod and gained by liquid and colorimeter.
Thus, experiment is described.
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which type of radio active decays
HELP PLEASE!!! In the diagram, q1 = -6.39*10^-9 C and q2 = +3.22*10^-9 C. What is the electric field at point P? Include a + or - sign to indicate the direction. 91 92 P 0.150 m ** 0.250 m (Hint: The distance from q1 to P is NOT 0.150 m.) (Remember, E points away from + charges, and toward charges.) (Unit = N/C) HELP PLEASE!!
Answer:
E = K Q / R^2
E1 = K Q1 / R1^2 = K * (-6.39 E-9) / .4^2 = -K 39.9 E-9
E2 = K Q2 / R2^2 = K * 3.22 E-9 / .25^2 = K 51.5 E-9
Field will point to right of P since E2 (positive) stronger
E = K (E2 - E1) = 9.0 E9 * (51.5 - 39.9) E-9 = 104 N/C
The electric field at point P is 104.6 N/C.
What is meant by electric field ?Every place in space where a charge exists in any form has an electric attribute that can be defined as the electric field.
Here,
q₁ = -6.39 x 10⁻⁹C
q₂ = 3.22 x 10⁻⁹C
Distance from q₁ to P, d₁ = 0.4 m
Distance from q₂ to P, d₂ = 0.25 m
Electric field at P due to q₁, E₁ = k x -6.39 x 10⁻⁹/(0.4)²
E₁ = -39.9 x 10⁻⁹k N/C
Electric field at P due to q₂, E₂ = k x 3.22 x 10⁻⁹/(0.25)²
E₂ =51.52 x 10⁻⁹k N/C
Therefore, total electric field at P,
E = E₂ - E₁
E = (51.52 - 39.9) x 10⁻⁹k
E = 104.6 N/C
Hence,
The electric field at point P is 104.6 N/C.
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a 5200w electric oven
Answer:
104 kWh
Explanation:
To calculate the kWh you multiply power with the amount of hours.
So for this we take 5200 W × 20 = 104 000 Wh
Then change Wh to kWh so that makes 104 kWh
Which relationship gives the value of r when r3 is adjusted so that the voltmeter reading is zero?.
Ohm's Law is a formula used to calculate the relationship between voltage, current and resistance in an electrical circuit.
Equation :
To students of electronics, Ohm's Law (E = IR) is as fundamentally important as Einstein's Relativity equation (E = mc²) is to physicists.
E = I x R
When spelled out, it means voltage = current x resistance, or volts = amps x ohms, or V = A x Ω.
NOTE : Because resistance cannot be measured in an active circuit, Ohm's Law is particularly helpful when determining resistance. The aforementioned application of Ohm's Law allows a technician to calculate R without having to turn the circuit off to measure resistance.
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which statement illustrates how progress in engineering has affected the natural enironment
The statement that illustrates how progress in engineering has affected the natural environment is extracting mineral resources with modern mining equipment removes fertile topsoil.
What is the Natural Environment?The natural environment may be defined as anything that can be present in the surroundings of living entities whether it is a biotic or abiotic factor.
The utilization of contemporary mining tools terminates fertile topsoil and admiringly impacts the fertility of the soil. It is tough to rebuild topsoil and modern mining tools constantly damage soil fertility.
Advancement in engineering has influenced the natural environment and mining is one of the most accepted measures of this.
The complete question is as follows:
Extracting mineral resources with modern mining equipment removes fertile topsoil.Mining companies use modern equipment to extract mineral resources more efficiently.Modern mining equipment has improved the health and safety of workers.Modern mining practices provide materials that can be used for technological advances.Therefore, it is well described above.
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A girl at a state fair swings a ball in a vertical circle at the end of a string, the force of the string at the bottom is: A-Less than the weight of the ball B-greater than the weight of the ball C-equal to the weight of the ball D-Zero
Can someone pls answer this question with brief explanation?
The force of the string at the bottom is greater than the weight of the ball. The correct option is B.
What is Net force?When two or more forces are acting on the system of objects, then the to attain equilibrium, net force must be zero.
A girl at a state fair swings a ball in a vertical circle at the end of a string.
When the ball is at the bottom . the force acting will be
The tension in the string , T = mass x centripetal acceleration + Force of gravity
So, T = m x ac + mg
Thus, the force of the string at the bottom is greater than the weight of the ball.
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Where will the strongest force be excerted by the scissor blades to cut through a piece of material? Explain your answer.
Answer:
in the thick part of the scissors ✂️
Explanation:
because in physics simple machine called wedge the force applied in this thick area it have thine side used to split or piece objects
Nuclear power stations convert the nuclear energy stored in nuclear fuel into what other store of useful energy?
Answer:
The right answer is "thermal energy" or "thermal" or "heat" or "heat energy" or "electricity" or "electrical energy"
Explanation:
Nuclear fuel is used to heat water, increasing its thermal energy. This hot water is used to turn turbines that generate electrical energy.
Nuclear power stations convert the nuclear energy stored in nuclear fuel into thermal energy.
What is thermal energy?
Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.
Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.
These vibrating molecules and atoms collide and as a result of which heat is generated in a substance , more the collision of particles , higher is the thermal energy.It has 3 types conduction, convection and radiation.
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One exciting fairground ride acts like a giant catapult. The capsule which the ‘rider’ is strapped in is fired high into the sky by rubber straps. Explain the energy changes taking place on the ride.
Answer:
- elastic energy of rubber straps → KE of capsule
- KE → GPE as capsule
Explanation:
which of the following would increase
Answer:
1 and 3
Explanation:
1 and 3
Increasing coils increases strength
COOLING the wire would increase current flow and strength of magnet
Adding an iron core will definitely increase the strength of the electromagnet
(1) Increasing the number of coils (✔)
VR is always greater than MA. why?
Answer:
The mechanical advantage (M.A) of a real machine is always less than its velocity ratio(V.R) because mechanical advantage decreases due to the friction and weight of moving parts of the machine whereas the velocity ratio remains constant.
which degree is best for science student?
Answer:
Computer Science or Science technology
Explanation:
It all depends on what aspect of science you're looking into such as biology, zoology, marine biology, etc. But since this world is evolving more and more around technology, your best bet is to get into something computer science or science technology.
What is the main difference between a longitudinal wave and a transverse wave? a longitudinal wave always travels faster than a transverse wave. a longitudinal wave does not need a medium to travel through. a transverse wave is made of particles that move perpendicular to the motion of the wave. a transverse wave always carries more energy so that it can travel through empty space.
In a longitudinal wave, the propagation of energy is in the direction of the motion, while in a transverse wave the propagation of energy is perpendicular to the direction of motion.
What is longitudinal wave and Transverse wave?Longitudinal wave is a wave which moves in the direction from where it was started. It has a compression (increased intensity) of the medium particles and a rarefaction ( reduced intensity).
Transverse wave is wave that travels perpendicular or at right angles to the direction from where it was started.
The main differences between longitudinal wave and Transverse wave are:
Transverse wave, the medium moves vertically up and down while in the longitudinal wave, the medium moves left to right.Transverse wave has a crest and a trough while the longitudinal waves have a compression and rarefaction.Transverse waves don't have a pressure variation , longitudinal waves have a pressure variation.Transverse waves can only be propagated in solids and on the surfaces of liquids, Longitudinal waves can be propagated in solids, liquids and gases.Transverse waves don't change in density throughout the medium, longitudinal waves have a change in density throughout the medium.Therefore,
The propagation of energy is in the direction of the motion, while in a transverse wave the propagation of energy is perpendicular to the direction of motion.
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A velocity-time graph can give you
A. Displacement of the moving object
B. Acceleration, displacement, and velocity.
C. Velocity of the moving object
D. Acceleration of the moving object
Answer:
A). Velocity time graph gives displacement..The area under V-t graph gives displacement.
More to know -
Velocity = speed/ time
it's speed with direction.
acceleration = rate of change of velocity
A velocity-time graph provides information about the motion of an object over time Acceleration, displacement, and velocity. The correct option is option (B).
Acceleration: The slope of the velocity-time graph represents the object's acceleration. A positive slope indicates positive acceleration (speeding up), a negative slope indicates negative acceleration (slowing down or decelerating), and a flat line indicates zero acceleration (constant velocity).
Displacement: The area under the velocity-time graph represents the displacement of the object. By calculating the area between the graph and the time axis, we can determine the total displacement.
Velocity: The graph directly shows the object's velocity at different points in time. The vertical position of the graph at any given time represents the object's instantaneous velocity.
Therefore, a velocity-time graph can provide information about the acceleration, displacement, and velocity of the moving object. The correct option is option (B).
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What is the final temperature of 0.1 kg of water initially at 22 *C after 10 kj of heat is added
The final temperature of the given mass of water at the initial temperature is 45.8 ⁰C.
Change in temperature of the waterThe change in temperature of the water is calculated as follows;
Q = mcΔθ
Δθ = Q/mc
where;
c is specific heat capacity = 4200 J/kgCΔθ = (10,000)/(0.1 x 4200)
Δθ = 23.8
Final temperatureT2 - T1 = 23.8
T2 = 23.8 + 22
T2 = 45.8 ⁰C
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a ball is thrown upward from the ground with an initial velocity of 50m/s. what is the total time spent by the ball in the air (g=10m/s2)
Answer:
[tex]\fbox {5 seconds}[/tex]
Explanation:
The formula which is used here :
[tex]\fbox {v = u + at}[/tex]
[tex]\longrightarrow \textsf {v : final velocity}[/tex]
[tex]\longrightarrow \textsf {u : initial velocity}[/tex]
[tex]\longrightarrow \textsf {a : acceleration}[/tex]
[tex]\longrightarrow \textsf {t : time taken}[/tex]
Solving :
v = u + at
0 = 50 + (-10)t
10t = 50
t = 5 seconds
compared to other spiral galaxies, the milky way is ____.
The Milky Way, a member of the "Local Group," is different than other galaxies in the universe. First, it is brighter than most galaxies that we have been able to see. Second, the Milky Way is a barred spiral galaxy; unlike typical spiral galaxies, barred spiral galaxies have flat discs in their centers.
Answer:
The Milky Way Galaxy, is a spiral galaxy, meaning that there are multiple arms spiraling in toward the middle of the galaxy. Are there any other galaxies in the universe shaped like the Milky Way Galaxy?
two point charges of magnitude 4.0 μc and -4.0 μc are situated along the x-axis at x1 = 2.0 m and x2 = -2.0 m, respectively. what is the electric potential at the origin of the xy-coordinate system?
The electric potential at the origin of the xy coordinate system is negative infinity
What is the electric field due to the 4.0 μC charge?The electric field due to the 4.0 μC charge is E = kq/r² where
k = electric constant = 9.0 × 10 Nm²/C², q = 4.0 μC = 4.0 × 10 C and r = distance of charge from origin = x₁ - 0 = 2.0 m - 0 m = 2.0 mWhat is the electric field due to the -4.0 μC charge?The electric field due to the -4.0 μC charge is E = kq'/r² where
k = electric constant = 9.0 × 10 Nm²/C², q' = -4.0 μC = -4.0 × 10 C and r = distance of charge from origin = 0 - x₂ = 0 - (-2.0 m) = 0 m + 2.0 m = 2.0 mSince both electric fields are equal in magnitude and directed along the negative x-axis, the net electric field at the origin is
E" = E + E'
= -2E
= -2kq/r²
What is the electric potential at the origin?So, the electric potential at the origin is V = -∫₂⁰E".dr
= -∫₂⁰-2kq/r².dr
Since E and dr = dx are parallel and r = x, we have
= -∫₂⁰-2kqdxcos0/x²
= 2kq∫₂⁰dx/x²
= 2kq[-1/x]₂⁰
= -2kq[1/x]₂⁰
= -2kq[1/0 - 1/2]
= -2kq[∞ - 1/2]
= -2kq[∞]
= -∞
So, the electric potential at the origin of the xy coordinate system is negative infinity
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Describe how a star is formed?
____________________________
Answer:
Star Formation
Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction.
hy XD ~
