Answer:
Spectral
Explanation:
I just answered this question on USA test prep
An ice cube (n = 1.31) has a layer of water (n = 1.33) on it. What is the critical angle for a ray in water trying to enter the ice?
(Unit=deg)
Answer:
Explanation:
Given that,
The Refractive index of glass is
n(ice) = 1.31
The refractive index of water is
n(water) = 1.33
What is the critical angle?
From water to ice
Critical angle is given as.
Using Snell's Rule.
Sin( θc ) = n1 / n2
for total internal reflection the incident ray is always in the denser medium! So, water is the more denser than ice.
Then, .
Sin( θc ) = n(ice) / n(water)
Sin( θc ) = 1.31 / 1.33
Sin( θc ) = 0.98496
θc = arcSin(0.98496)
θc = 80.05°
The critical angle is 80.05°
A circuit with a current of 400 amp has several lights that have a total resistance equal to 30 ohms. Find the voltage.
Answer:
V= 12000 V
Explanation:
Using Ohm's Law
V= I x R
V= 400 x 30
V= 12000 v
The voltage in a circuit can be found using Ohm's law (V = I * R). In the given circuit with a current of 400 Amps and a resistance of 30 Ohms, the voltage would be 12,000 volts.
Explanation:The subject of this question is related to electricity in Physics, specifically dealing with calculating voltage in a circuit. The relation between voltage, current, and resistance in a circuit can be given by Ohm's law, which states that voltage equals current times resistance (V = I * R). In this case, to find the voltage, you would multiply the given current (400 amps) and resistance (30 ohms). Thus, the voltage in this circuit would be 400 Amp * 30 ohms = 12,000 volts.
Learn more about Voltage here:https://brainly.com/question/31347497
#SPJ2
1. Oxygenated blood is necessary for proper bodily functions. If there isn’t enough oxygen in a person’s blood they can become light headed, disoriented, and feel extremely tired. How does the oxygen enters the blood?
Answer:
Explanation:
The oxygen enters the bloodstream from the alveoli, tiny sacs in the lungs where gas exchange takes place.
The transfer of oxygen into the blood is through simple diffusion.The oxygen molecules move, by diffusion, out of the capillaries and into the body cells.
Answer:
The oxygen enters the bloodstream from the alveoli, tiny sacs in the lungs where gas exchange takes place. The transfer of oxygen into the blood is through simple diffusion. ... The oxygen molecules move, by diffusion, out of the capillaries and into the body cells.
Two events in space are described below.
Event 1: The moon moves into the shadow of Earth at night and this makes it difficult to see the moon from Earth.
Event 2: The moon comes between the sun and Earth, but the moon only covers the center of the sun's disk and the sun's circular edge is visible.
Which event or events represent(s) a total solar eclipse on Earth?
Group of answer choices
Only Event 1
Only Event 2
Both Event 1 and Event 2
Neither Event 1 nor Event 2
Answer: Neither Event 1 nor Event 2
Explanation:
Let's begin by explaining when a total solar eclipse occurs:
A total solar eclipse occurs when "the Moon hides the Sun" (as seen from Earth).
So, in order to make this situation posible, the Sun, Moon, and Earth must be aligned in the plane of the ecliptic; and Moon must be in the New Moon phase. When this happens, the Moon completely covers the solar disk.
Hence, according to his explanation, Neither Event 1 nor Event 2 describe a Total Solar Eclipse, since Event 1 is not related to a solar eclipse and Event 2 describes an annular solar eclipse on Earth.
How much voltage is required to run 0.64 A of current through a 240 resistor? Use V= IR.
A. 6.5 x 10^-3 V
B. 1.5 x 10^2 V
C. 3.8 x 10^2 V
D. 2.7 x 10^-3 V
Answer:
B
Explanation:
Math
4. A pendulum oscillates 12 times in 4 seconds.
a. What is the frequency of the pendulum's oscillations?
b. What is the period of the pendulum's oscillations?
Time period and frequency of its oscillation are 3 sec and 0.33 hertz.
Explanation:
A pendulum is used to describe the too and flow motion of it which is caused due to gravity. A bob consisting of less mass suspended from upper surface by pivot and it is the one which swings due to gravity.
Given:
A simple pendulum makes 12 oscillations in 4 seconds.
time period=?
frequency=?
As pendulum makes 12 oscillations in 4 seconds.
The time taken by pendulum for making one oscillation is 12/4 sec = 3 sec.
Time period = 3 sec.
Frequency of the pendulum's oscillations is found by the formula
Frequency = 1/T = 1/3 = 0.33 Hz
∴Time period and frequency of its oscillation are 3 sec and 0.33 hertz.
Frequency and Period of the pendulum's oscillations is 3 and 0.33 Hz.
Frequency and Period:Given that;
Number of oscillates = 12 times
Total time taken = 4 sec
Find:
Frequency of oscillations
Period of oscillations
Computation:
Period of the oscillations = 12 / 4
Period of the oscillations = 3 times
Frequency of the oscillations = 1 / 3
Frequency of the oscillations = 0.33 Hz
Find out more information about 'Frequency'.
https://brainly.com/question/17196899?referrer=searchResults
Human activies that impact water cycle include
a. Use of toxic chemicals in agriculture and manufacturing run-off
b. A decreased use of water by animals
c. An increase of sedimentation of rivers
d. A decrease in the erosion of creek beds
Answer:
a. Use of toxic chemicals in agriculture and manufacturing run-off
Explanation:
it is the only activity listed the rest are possible impacts
Answer:
A
Explanation:
Which list shows the element symbols of the 6 biological elements?
Answer:
C, H, N, O, P, S
Explanation:
carbon, hydrogen, oxygen, phosphorus, and sulfur are the 6 most common in biomolecules
When a roller coaster goes in an upside-down loop, which of the following is true?
A: the force reasonable for circular motion is acting toward the middle of the loop.
B:the force reasonable for circular motion is a ting all the way to the ground.
C: the force reasonable for circular motion is acting toward the top of the loop.
D: no force is acting on the roller coaster.
Answer:
The force responsible for circular motion is acting toward the middle of the loop.
Explanation:
When a roller coaster goes in an upside-down loop, the force responsible for circular motion is acting toward the middle of the loop. The correct option is A.
When a roller coaster rides through an upside-down loop, the force that causes circular motion acts towards the centre of the loop.
This force is known as the centripetal force, and it operates perpendicular to the roller coaster's velocity at each point of the loop.
To keep the roller coaster travelling in a curved course and from flying off the track, centripetal force is required.
The centripetal force pushes the roller coaster inward as it enters the loop, providing the necessary acceleration to maintain its round track.
This force keeps the roller coaster safely on the track and gives passengers the exhilarating sensation of being inverted.
Thus, the correct option is A.
For more details regarding centripetal force, visit:
https://brainly.com/question/14021112
#SPJ2
6. Oxygen has an atomic number of 8. What can you
conclude from this fact?
a. An atom of oxygen weighs 8 grams.
b. An atom of oxygen has 4 protons and 4 electrons.
c. An atom of oxygen has 8 positrons.
d. An atom of oxygen has 8 protons.
Answer:
Explanation:
Oxygen has an atomic number of 8,
Then, it has eight electrons revolving round its nucleus.
And since it a neutral atoms.
Number of neutron ≈ number of electron
Number of proton = Number of electron.
Then, the number of proton is 8
So, we can find it mass number of molecular weight
Molecular weight = number of proton + number of neutron
Molecular weight = 8 + 8
Molecular weight = 16g/mol
So, the correct answer is D
An atom of oxygen has 8 protons.
In physics, work is defined as ________.
A.the process of applying a force through some distance
B.energy that is expended to push on an object
C.the process of moving an object from one place to another
D.the process of moving an object through a distance
HELP PLZ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
B, Energy that is expended to push on an object.
Explanation:
Work is the usage of energy to make an object go a certain distance.
GIVING BRAINLIEST Which statement best explains how Earth's magnetic field is generated? Earth's core spins slower than its crust Heat exchange between the mantle and crust The convection of heat within the mantle Rotation of liquid iron in the outer core
Answer C is INCORRECT. The correct answer is "Rotation of liquid iron in the outer core." For example the text from my course states that "As Earth spins on its axis, rotation of the liquid outer core generates Earth's magnetic field."
The statement best explains how Earth's magnetic field is generated by the Rotation of liquid iron in the outer core
What is magnetic field of earth?Earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from Earth's interior out into space, where it interacts with the solar wind, a stream of charged particles emanating from the Sun.
The magnetic field is generated by electric currents due to the motion of convection currents of a mixture of molten iron and nickel in Earth's outer core
The inner core (which is solid) is the hottest layer of the earth. It, therefore, contributes to heating up the outer core. The outer core is liquid and rotation of the earth (Coriolis effect) causes the molten rocks to swirl like a tornado.
Because the outer core is mostly made of metals, that have lost electrons and hence charged (due to the enormous heat), the swilring effect causing an electric effect.
This consequently causes the dynamo effect that creates a magnetic field. This magnetic field covers the earth and protects it from harmful radiation from the solar storms.
To know more about earth's magnetic field follow
https://brainly.com/question/103589
Based on Kepler's third law of motion, what is the relationship between a planet's orbital velocity and its distance from the sun?
A)The greater the distance, the greater the orbital velocity.
B)Distance has no effect on orbital velocity.
C)As distance is cut in half orbital velocity decreases.
D)The greater the distance, the slower the orbital velocity.
Based on Kepler's third law of motion, the relationship between a planet's orbital velocity and its distance from the sun is
D)The greater the distance, the slower the orbital velocity.
Explanation:
A planet's orbital speed changes, depending on how far it is from the Sun. The farther it is from the Sun, the weaker the Sun's gravitational pull, and the slower it moves in its orbit.A planet's orbital speed changes, depending on how far it is from the Sun. The closer a planet is to the Sun, the stronger the Sun's gravitational pull on it, and the faster the planet moves. The farther it is from the Sun, the weaker the Sun's gravitational pull, and the slower it moves in its orbit.Kepler's first law - sometimes referred to as the law of ellipses - explains that planets are orbiting the sun in a path described as an ellipse. The resulting shape will be an ellipse. An ellipse is a special curve in which the sum of the distances from every point on the curve to two other points is a constant.Kepler's second law of planetary motion describes the speed of a planet traveling in an elliptical orbit around the sun. It states that a line between the sun and the planet sweeps equal areas in equal times. Thus, the speed of the planet increases as it nears the sun and decreases as it recedes from the sun.Kepler's Third Law. “The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit” That's Kepler's third law. In other words, if you square the 'year' of each planet, and divide it by the cube of its distance to the Sun, you get the same number, for all planetsAnswer:
hi i thinks its a
Explanation:
A property unique to a conducting substance that determines its resistance is called:
A. conductance
B. resistivity
C. proclivity
D. circuitry
Answer:
B. Resistivity
Explanation:
Resistance offered by a substance of unit area per unit length.
in what state of matter can conduction occur
Conduction can occur in all states of matter, including solid, liquid, gas, and plasma. This process involves the transfer of heat through stationary matter by direct physical contact, a result of the thermal motion of atoms and molecules.
Explanation:Conduction, which in the context of physics refers to heat transfer through stationary matter by physical contact, can occur in all three common states of matter - solids, liquids, and gases. This transfer is due to the thermal motion of atoms and molecules at any temperature above absolute zero. For instance, heat is transferred between an electric burner of a stove and the bottom of a pan by conduction. This is because the energetic motion of particles in one area spreads to other regions, and even to adjacent objects in close contact.
In the solid state, conduction is quite efficient because the particles are closely packed and can readily transfer energy to their neighbors. In liquids and gases, the particles are more spread out, but conduction still occurs, albeit at a slower pace. A fourth state of matter, plasma, also exists and conductive heat transfer occurs within this state because it contains appreciable numbers of electrically-charged particles.
Learn more about Conduction here:https://brainly.com/question/38377935
#SPJ2
What is the standard unit to measure force?
Answer: newton
Explanation:
How does Mr. Anderson define solubility in the video?
2. What is the solubility of talc in 100 mL of 25 °C water? Explain why talc has this solubility. 3. Describe how increasing temperature affects the solubility of solid and liquid solutes.
4. Why is there less oxygen in ocean water near the equator than in water at higher latitudes? 5. A factory discharges clean, warm water into a nearby stream. Fish keep dying in this part of stream. Explain why.
Solubility is the capacity of a solute to dissolve in a solvent. Warm temperatures often increase the solubility of solids and liquids, but reduce the solubility of gases like oxygen. This is why warmer ocean waters and artificially warmed waters can contain less oxygen, potentially leading to negative effects on aquatic life.
Explanation:In the video, Mr. Anderson defines solubility as the maximum amount of solute that can be dissolved in a specific amount of solvent at a given temperature. For instance, the solubility of talc in water at 25 °C is fundamentally none because talc is a mineral compound that does not interact with water molecules to any significant extent. Talc particles will simply settle to the bottom rather than dissolve.
The solubility of both solid and liquid solutes usually increases with temperature, although there are exceptions. The increase in kinetic energy that comes with higher temperatures allows solute particles to break apart more easily and become dispersed throughout the solvent.
Ocean water near the equator contains less dissolved oxygen than water at higher latitudes due to the effect of temperature on gas solubility. The higher temperatures near the equator decrease the solubility of oxygen, leading to lower concentrations. In the scenario of fish dying in the part of a stream into which a factory discharges clean, warm water, the likely cause is a decrease in the solubility of oxygen due to the temperature rise, leading to insufficient oxygen for the fish to survive.
Learn more about Solubility here:https://brainly.com/question/28170449
#SPJ12
Starting from rest, how long does it take a moving man to reach a velocity of 5 m/s if his acceleration is +1.75 m/s2?
Answer:
time=20/7 seconds
Explanation:
Initial velocity(u)=0
Final velocity(v)=5m/s
Acceleration(a)=1.75m/s2
Time(t)=?
V=u+at
5=0+1.75xt
5=1.75t
t=5/1.75
t=20/7 seconds
What is created when charged particles are moving in a single direction and path?
I think it is Drift Velocity.
if many household substances classify as acids or bases what is the ph scale
Answer: Some household items that contain acids include: yogurt, vinegar,lemon juice, citric acid, apples, jelly, pineapples, cranberry sauce, milk, and batteries and In chemistry, pH is a scale used to specify how acidic or basic a water-based solution is. Acidic solutions have a lower pH, while basic solutions have a higher pH. At room temperature, pure water is neither acidic nor basic and has a pH of 7.
The potential energy an object has due to it position Is called _______ potential energy
Final answer:
The potential energy an object has due to its position is called gravitational potential energy. It is related to an object's height relative to a gravitational source, typically Earth, and increases with elevation. Another form, elastic potential energy, is stored in stretched or compressed objects.
Explanation:
The potential energy an object has due to its position is called gravitational potential energy. This type of energy is a function of an object's position relative to a source of gravitational force, usually Earth for problems encountered in middle and high school physics. Gravitational potential energy increases as the height of an object increases relative to a reference point, commonly ground level. For example, a book placed on a higher shelf has more gravitational potential energy compared to when it is on a lower shelf because it has the potential to do more work if it falls.
Another form of potential energy relevant in physics is elastic potential energy, which is stored in objects like springs and rubber bands when they are stretched or compressed. This energy is a function of the displacement and the stiffness of the object, as described by Hooke's Law.
What would happen if you shone a ray of light at right angles to the surface of the glass block?
Answer:
it would reflect at a 90 degree angle
Explanation:
when light is shone onto glass, it will reflect the direction it is facing no matter what. right angles will shine it at a 90 degree angle if you shine light at the exact angle above it
Substances that enhance the flow of current are called . Substances that inhibit the flow of current are known as . Substances that neither conduct nor inhibit well are called .
Answer:
Substances that enhance the flow of current are called conductors
Substances that inhibit the flow of current are known as insulators
Substances that neither conduct nor inhibit are called semiconductors
Explanation:
Substances that enhance the flow of current are called conductors because they allow electrical charges to pass through them.Substances that inhibit the flow of current are known as insulators because they prevent the flow of electrical charges through them.Substances that neither conduct nor inhibit flow of current as well are called semiconductors. These substances although they cannot conduct of prevent the flow of current, in certain conditions they can be made to conduct and reversed as well.Answer:
ABC
Explanation:
someone pls help with question 4
Answer:
given.. mass of copper 2kg
initial temperature is copper(I)=100°cvolume of water(5l)=5kg of waterinitial water temperature =20°cwhat's the final temperature(f)??from the concept
heat lost from an object=heat gained by the other object
Heat=McΔT
Mč x Cč x ΔTč = Mw x Cw x ΔTw
2kg x 385J/kg°C x (100°c - {F}) = 5kg x 4200J/kg°C x ({f} - 20°C)
77000 - 770F = 21000F - 420,000
21770F =497000
....divide both sides....
F=22.83°C
therefore the final temperature of the water was 22.83°C
Which of the following is an example of a push?
A. Throwing a baseball
B. Doing chin-ups
C. Reeling in a fish with a fishing pole
D. Opening a car door from the outside.
Answer:
throwing a baseball.
Explanation:
chin ups are also called pull ups
reeling in a fish is pulling it in
opening a car door is pulling it open
In which situation is the gravitational force between two objects hard to detect?
A. if the mass of one of the objects is very great
B. if the mass of both objects is very great
C. if the objects are very close together
D. if the mass of each object is very small
Reset
Submit
Answer:
D.
Explanation:
Newton's Law of Gravitation states that:
[tex]F_G = \frac{-Gm_1m_2}{r^2}[/tex]
If the masses of each object is small, then [tex]m_1*m_2[/tex] would be very small, making the gravitational force between the two objects hard to detect - as it itself would be very small.
Answer&Explanation:
According to the Newton gravitational law is directly proportional to the Product between masses and inversely proportional to the square of the distance..
Hence from the law and corresponding question the correct answer is D:if the mass of each object is very small
Thus it would make it undetectable
Help me please! 25 points
Answer:
1.A compound is a substance formed when two or more elements are chemically joined.
2.3 things that can be consider compounds are water,sugar and methane
Explanation:
Answer:
1.A compound is a substance formed when two or more elements are chemically joined.
2.3 things that can be consider compounds are water,sugar and methane
Explanation:
to easy
What do the iron filings around this magnet show?
Answer:
the opposite connections of the poles
Explanation:
The city bus traveled 30 miles in 30 minutes. What was its speed in mph?
A. 2 mph
B. 60 mph
C. 16 mph
Answer:
B. 60 mph
Explanation:
How is frequency related to time period
Answer:
mark brainliest :)
Explanation:
Frequency and period are inversely related quantities. Frequency refers to how often something happens; whereas Period refers to the time it takes for something to happen. ... Frequency is the number of cycles/second denoted as Hertz (Hz). Period is the seconds/cycle.
Explanation:
Relation between frequency (f) and time period(T)
By the definition of frequency,
f vibrations are completed in one second
Or 1 vibration is completed in 1/f second
But, time to complete one vibration is its time period (T)
[tex]therefore \: \: \: t = \frac{1}{f} [/tex]
This shows that time period of Wave is reciprocal of frequency.
Hope this helps.