Answer:
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Explanation:
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A monochromatic beam of light has a frequency of 6.5 x 10" hertz. What color is the light?
O orange
O yellow
O violet
O blue
Answer:
violet
Explanation:
A lamp is connected to the power supply.
The lamp requires an input potential difference of 5.0V
The alternator generates a potential difference of 1.5V
The primary coil of the transformer has 150 turns.
Calculate the number of turns needed on the secondary coil
Number of turns on the secondary coil = ?
Answer:
There are 45 turns in the secondary coil.
Explanation:
Given that,
Input potential of the lamp, [tex]V_{in}=5\ V[/tex]
The output potential of the lamp, [tex]V_{out}=1.5\ V[/tex]
Number of turns in primary coil, [tex]N_P=150[/tex]
We need to find the number of turns needed on the secondary coil. We know that the ratio for a transformer is as follows :
[tex]\dfrac{V_{out}}{V_{in}}=\dfrac{N_s}{N_P}\\\\N_s=\dfrac{V_{out}N_P}{V_{in}}\\\\N_s=\dfrac{1.5\times 150}{5}\\\\N_s=45\[/tex]
So, there are 45 turns in the secondary coil.
The efficiency of an appliance CAN be more than 100 percent. True or False
Answer:
The answer is true
Gabriel is sledding down a snowy hill. At which of the following positions will Gabriel's potential energy be the least and his kinetic energy be the greatest?
A. 3
B. 2
C. 1
D. 4
calculate the frequency of a wave using an equation
Answer:
1. f=1T. where: f is the frequency of the wave in hertz. T is the period of the wave in seconds.
2. f=vλ where: f is the frequency of the wave in hertz. v is the velocity of the wave in meters per second. λ is the wavelength of the wave in meters
3. f=cλ
Explanation:
unit of speed is derived unit why
Answer:
Explanation:
Therefore, the unit of speed is the meter per second, or m/s. The unit meter per second is called a derived unit, meaning that it is derived from the seven SI base units.
Answer:
Derived SI Units
Explanation
In physics there are many quantities that cannot be expressed by a single base unit. ... Therefore, the unit of speed is the meter per second, or m/s. The unit meter per second is called a derived unit, meaning that it is derived from the seven SI base units.
A(n) _______ studies physical components and characteristics of celestial objects.
The answer is ASTROPHYSICIST!
Answer:
Astronomers?
Explanation:
Answer:
Astrophysicist?
Explanation:
True or false EM waves with longer wavelengths have higher frequencies
Answer:
false
Explanation:
a longer wavelength means a lower frequency, and a shorter wavelength means a higher frequency.
A car's engine generates 100,000W of power as it exerts a force of 10,000N . How long does it take the car to travel 100m ?
Answer: 10 s
Explanation:
Given
Engine generates [tex]100,000\ W[/tex] power
Force exerts [tex]F=10,000\ N[/tex]
Distance traveled [tex]d=100\ m[/tex]
work done is given by
[tex]W=F\cdot d\\W=10,000\times 100\\W=10^5\ J[/tex]
Also, Energy is given as
[tex]\Rightarrow E=P\cdot t[/tex]
Insert the values
[tex]\Rightarrow 10^6=100,000\times t\\\\\Rightarrow t=\dfrac{10^6}{10^5}\\\\\Rightarrow t=10\ s[/tex]
Distance affects the amount of potential energy stored within a system that consists of two bar magnets. A student placed two bar magnets on a table with like poles facing each other.
Which line on Graph 2 accurately shows the relationship between distance and the amount of potential energy stored in this system?
Answer: Line A
Explanation: Distance AFFECTS the amount. Potential Energy DOESN'T AFFECT the distance.
Line B accurately shows the relationship between distance and the amount of potential energy stored in this system.
What is meant by magnetic potential energy ?The amount of work required to rotate a magnetic dipole from its zero potential state to any desired position is known as the potential energy of the magnetic dipole in a magnetic field.
Here,
Maxwell's equations establish a relation between magnetic potential energy and electrostatic potential energy. The mechanical work of the magnetic force (really, magnetic torque) on the re-alignment of the vector of the magnetic dipole moment is what is known as the potential energy of a magnet or magnetic moment m in a magnetic field B.
The magnetic field's direction and distance have an impact on magnetic PE. A magnet's south pole can get close to its opposite pole's north pole. The two magnets are drawn together by this force. Their potential energy increases with increasing distance. It is possible for two north poles to collide.
The fields of the magnets are perfectly opposite one another. They are forced apart by a repelling force created by the field. Each one repels the other. The closer they are in this situation, the greater their potential energy will be.
Hence,
Line B accurately shows the relationship between distance and the amount of potential energy stored in this system.
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A student has an 80 g sample of a radioactive material that has a half-life of 20 seconds. How much material will he have left after 60 seconds?
A.
10 g
B.
20 g
C.
40 g
D.
5 g
Which of the following best describes how heat is transferred by conduction?
a. Particles in warmer objects make particles in colder objects move faster.
b. Particles in colder objects make particles in warmer objects move slower.
c. Particles in warm and cold objects mix together and transfer energy.
d. Particles move from warmer objects to colder objects.
a. Particles in warmer objects make particles in colder objects move faster.
A 128 gram Radium-226 sample with a half-life of 2.25 billion years is found. How many grams will remain after two half-lives?
A 16 grams
B.32 grams
C.64 grams
D.128 grams
Answer:
Option B. 32 g
Explanation:
From the question given above, the following data were obtained:
Original amount (N₀) = 128 g
Half-life (t½) = 2.25 billion years
Number of half-lives (n) = 2
Amount remaining (N) =?
The amount of 128 gram of Radium-226 that will remain after 2 half-lives has elapsed can be obtained as followb
N = 1/2ⁿ × N₀
N = 1/2² × 128
N = 1/4 × 128
N = 0.25 × 128
N = 32 g
Therefore, 32g of the sample will remain.
When an object absorbs light energy, it reflects
A. all of the colors
B. none of the colors
C. only the colors you see
When an object absorbs light energy, it reflects none of the colors. The correct option is B.
What is reflection?The change in direction of a wavefront at an interface between two different media so that the wavefront returns to the medium from which it originated is referred to as reflection. Reflection of light, sound, and water waves are common examples.
Objects appear different colors because they absorb certain colors (wavelengths) while reflecting or transmitting others. The wavelengths that are reflected or transmitted are what we see as colors.
If photon energy is absorbed, the energy from the photon is typically manifested as heating the matter.
Light absorption causes an object to become dark or opaque to the wavelengths or colors of the incoming wave: Wood is impervious to visible light.
Thus, the correct option is B.
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Ellie cycled from her home to her friend’s house. She stayed at her friend’s house and then travelled home.
a. At what time did Ellie leave home?
b. How far was Ellie from home while visiting her friend?
c. How long did Ellie stay at her friend’s house?
Of all of the structures in a cell, which actually contains the cell's DNA? A. Mitochondria B. Cell membrane C. Nucleus D. Cytoplasm
Answer:
C. Nucleus
Explanation:
The nucleus, formed by a nuclear membrane around a fluid nucleoplasm, is the control center of the cell. Threads of chromatin in the nucleus contain deoxyribonucleic acid (DNA), the genetic material of the cell.
have a good day and here’s a funny comic just for fun! :)
How death rate helps in changing population
what are the function of mercury barometer
Answer:
A mercury barometer is an instrument used to measure atmospheric pressure in a certain location and has a vertical glass tube closed at the top sitting in an open mercury-filled basin at the bottom. Mercury in the tube adjusts until the weight of it balances the atmospheric force exerted on the reservoir.
Explanation:
Answer:
1. The density of mercury (=13.6×10 to power 3 kg /m) is greater than that of any other liquid so only 0.76m height of mercury column is needed to balance the normal atmospheric pressure. Use of other liquids require much longer tube .
2.The vapour pressure of mercury is negligible, and so the vacuum does not affect the barometric height.
3.The mercury neither wets nor sticks to the glass tube therefore gives accurate reading.
4.It can easily be obtained in a pure taste .
5. Mercury has a opaque and shinning surface therefore can me easily seen while taking the reading.
Explanation:
A mercury barometer is an instrument used to measure atmospheric pressure in a certain location and has a vertical glass tube closed at the top sitting in an open mercury-filled basin at the bottom. Mercury in the tube adjusts until the weight of it balances the atmospheric force exerted on the reservoir.
Where was the first FIFA World Cup held?
(HINT: The host country won the tournament
Answer:
The 1930 FIFA World Cup was the inaugural FIFA World Cup, the world championship for men's national association football teams. It took place in Uruguay from 13 to 30 July 1930.
Explanation:
hope it helps if so pls give it the brainliest answer
Answer:
[tex]\huge\boxed{Uruguay\hookleftarrow}[/tex]
⎇ The first FIFA World Cup Championship took place in Uruguay from from 13 July 1930 to 30 July 1930.
An electron is released in a uniform electric field with a magnitude of 8000 V/m. The electron is displaced 2 m as a result. Find the potential difference between the electron's initial and final
Complete question:
An electron is released in a uniform electric field with a magnitude of 8000 V/m. The electron is displaced 2 m as a result. Find the potential difference between the electron's initial and final position.
Answer:
the potential difference between the electron's initial and final position is 16,000 V.
Explanation:
Given;
magnitude of the electric field, E = 8,000 V/m
initial position of the electron, x₀ = 0
final position of the electron, x₁ = 2 m
The potential difference between the electron's initial and final position;
V = E(x₁ - x₀)
V = 8000(2 - 0)
V = 16,000 V
Therefore, the potential difference between the electron's initial and final position is 16,000 V.
A baseball is thrown at a 22.5° angle and an initial velocity of 65 m/s. What will be its horizontal
and vertical velocity?*
Answer:
Horizontal
Explanation:
It is going more sideways than upwards
Multi-Choice!
A gold pendulum swings with angular acceleration a, and a point on the edge has tangential acceleration a. A silver pendulum swings with angular acceleration 3a, and a point on the edge has tangential acceleration 5a. How does the radius of the gold pendulum r gold compare with the silver pendulum r silver ?
A 1/15
B 5/3
C 15
D 3/5
Answer:
D 3/5 i took this quiz still waiting on grade tho
Brainliest for correct answer! :)
Answer:
1. 300.15
2. 873.15
3. 221.95
1. -243.15
2. -210.85
3. 295.17
Examples of Cardiovascular Endurance ( check all that apply)
Answer:
Cardiorespiratory endurance is the level at which your heart, lungs, and muscles work together when you're exercising for an extended period of time.
...
Other activitiesrunning or jogging.swimming.cycling.dancing.boxing.aerobics or similar activities.any active sport.Atoms in Group 18 elements are inert (chemically unreactive) because ___________________________. A they combined to form molecules. B they have no valence electrons. C they have filled inner energy levels. D they have a full valence shell.
When you say full valence shell, are you talking about a valence electron shell?
I am learning about atoms and i know a little bit
Atoms in Group 18 elements are inert (chemically unreactive) because they have no valance electrons. The correct option is B.
What is valency?In chemistry, an element's valence or valency is the measure of its ability to combine with other atoms to form chemical compounds or molecules.
The number of atoms of one element combined with one atom of another element to form a molecule is referred to as its valency.
Valency is also referred to as molecular weight. Valency is a measure of an atom's combining power. The number of electrons in an element's outermost shell determines its valency.
Because of their full valence shells, noble gases are unreactive. They do not easily gain or lose electrons because they are already in the most stable electronic configuration.
Thus, the correct option is B.
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A car accelerates at a rate of 13m/s^2[S]. If the car's initial velocity is 120km/h[N]. What will be its final velocity in m/s, after 2 seconds.
Answer:
the final velocity of the car is 59.33 m/s [N]
Explanation:
Given;
acceleration of the car, a = 13 m/s²
initial velocity of the car, u = 120 km/h = 33.33 m/s
duration of the car motion, t = 2 s
The final velocity of the car in the same direction is calculated as follows;
v = u + at
where;
v is the final velocity of the car
v = 33.33 + 13 x 2
v = 59.33 m/s [N]
Therefore, the final velocity of the car is 59.33 m/s [N]
How does the motion of the atoms in the spoon change when the spoon is placed in the hot coffee?
А
The atoms vibrate faster due to the conduction of heat through atoms in the spoon.
B
The atoms vibrate slower due to the conduction of heat through atoms in the spoon
С
The atoms move closer toward each other due to the radiation of heat through atoms in the spoon.
D
The atoms move away from each other due to the convection of heat through atoms in the spoon.
Answer:
A.The atoms vibrate faster due to the conduction of heat through atoms in the spoon.
Can someone help me figure this out please?
Answer:
2/B
6/E
7/F
12/6
Explanation:
Hope this helps i dont know ither i will put if i think of them
Tyra made the following bar graph shown to represent the relative distances of four different astronomical bodies from Earth.
The title of the bar graph is Distance of Bodies in Space from Earth. Four bars are labeled A, B, C, and D. Bar C is the shortest. Bar D is about three times the size of bar C. Bar A is about six times the size of bar C. Bar B is about eight times the size of bar C.
If D represents Mercury, which of the following could be represented by B and C?
B could be the moon, and C could be Venus.
B could be Venus, and C could be the moon.
B could be the moon, and C could be Jupiter.
B could be Jupiter, and C could be the moon.
Answer: D
Choice A calls B the moon which is incredibly tiny compared to Venus so this is wrong, choice B calls B Venus which is a relatively small planet and C the moon... that is a bit overkill so no. Choice C says B is the moon and C is Jupiter, Jupiter being the largest planet this is a easy no, leaving D to be the only logical and correct answer.
Explanation: MARK ME BRAINLIEST PLZZZZZZZZZZzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
Answer: Answer D. because B. Jupiter is the farthest from Earth from those answer choices and C. is the moon because it is the closest out of those answer choices.
So, the answer is D: B could be Jupiter, and C could be the moon.
Explanation: Please give Brainlist.
Hope this helps!!!!
Calculate the density of a substance whose mass is 160,000kg and volume 20m