Answer:
when the direction of the Current changes.
Explanation:
Electromagnet refers to an iron ore wrapped around with a coil of wire, in presence of electric current. As it acts like a magnet, when current is passed through it.
The north & south poles of magnetic fields produced by such magnet, change with direction of current passed through it.
Answer:
current
Explanation:
edge2021
pls help me !!! <3333
Answer:
1. Is a different pitch, has a different speed
2. is brighter or dimmer, has a different energy
Explanation:
A student charges a balloon and then brings it near a metal sphere hanging from the
ceiling. She brings it near the sphere, but does not touch. The sphere moves toward
the balloon. What are the charges on the balloon and the metal sphere?
a) The balloon has a positive charge and the metal sphere has a negative charge.
b) The balloon has a negative charge and the metal sphere has a positive charge.
c) Both are negatively charged.
d) Both are positively charged.
Answer:
B
Explanation:
the balloon has a negative charge and the metal sphere has a positive charge
Answer: B
Explanation:
The balloon will pick up stray electrons, so it will become negatively charged. Since it is attracted to the metal sphere, the sphere must be positively charged.
what is the second and third law of newton? asap
Answer:
In the second law, the force on an object is equal to its mass times its acceleration. I hope this helped!
Explanation:
Pleas answer all three no links I will report you brainliest if right and 50 points
Answer:
1. 30,000 Kelvin, or 53,540 Farenheit, or 29,726 Celcius
2. i'm not sure, I'm sorry. I know that there are several, and one of them is helium.
3. This fusion changes the inner composition of the star, eventually it becomes a red giant or supergiant
Explanation:
Hope this helps :)
When a 0.400 A current flows
across a resistor, the voltage drops
by 42.0 V. What is the resistance?
(Unit = Ohm)
Answer:
105
Explanation:
Trust brother
What is the rule you would write describing how light reflects off a mirror?
Answer: The angle of incidence equals the ray of reflection. So this law states that any ray of light that strikes an object will reflect off the object such that the striking or incident angle is identical to the reflecting angle (as measured from the normal).
Explanation:
Higher amplitudes sound will have a _____________________ sound while lower amplitude will have a __________________________ sound. 10. The speed of sound is dependent on density and temperature of the medium being used so that higher density or temperature will yield a (higher / lower) speed (Kinetic Molecular Theory). 11. Give an example of any resonance heard: 12. Give an example of any echo heard. 13. Give an example of any evidence that sound is energy traveling in waves.
Answer:
9) HIGHER AND LOWER INTESITY, 10) speed of sound must decrease.
11) guitar the strings, flute, 12) In the mountains, 13) sound of a low frequency horn (sub-wofeer)
Explanation:
In this exercise we are asked to complete the sentences.
9) the intensity of the sound is the square of the amplitude, the missing words are
HIGHER INTESITY
LOWER INTENSITY
10) the speed of sound is
v = [tex]\sqrt{\frac{B}{\rho} }[/tex]
and it is also related to temperature
v = [tex]v_o \sqrt{1+ \frac{T}{273} }[/tex]
We must be careful since the compressibility modulus (B) changes significantly between the solid, liquid and gaseous states, if we are in the same medium, the speed of sound decreases with increasing density. For a higher density the speed of sound decreases
Also the speed of sound increases with temperature, but its effect is less,
Therefore, by having these two effects in the opposite direction, the change in density is more important, so the speed of sound must decrease.
.
11) when you listen to a guitar the strings resonate with the instrument body
on the flute has a resonance between the blown air and the flute tube
12) When you are in front of a tall object, the sound is reflected and the echo is heard.
In the mountains, in the squares where there is a large object that reflects in sound
13) when we hear the sound of a low frequency horn (sub-wofeer) we feel the vibration of the air, this is an effect of the pressure energy of the sound on our chest
If the work required to speed up a car from 11 km/h to 21 km/h is 6.0×103 J , what would be the work required to increase the car’s speed from 21 km/h to 33 km/h
Explanation:
We need convert the velocities first to m/s and we get the following:
v2 = 21 km/hr = 5.8 m/s
v1 = 11 km/hr = 3.1 m/s
We need to find the mass of the car also for later use do using the work-energy theorem:
[tex]delta \: w = \frac{1}{2} m(v \frac{2}{2} - v\frac{2}{1} )[/tex]
6.0x10^3 J = (0.5) m [(5.8)^2 - (3.1)^2]
or
m = 499.4 kg
Now we determine work needed delta W to change its velocity from 21 km/hr to 33 km/hr
v2 = 33 km/hr = 9.2 m/s
v1 = 21 km/hr = 5.8 m/s
delta W = (0.5)(499.4)[(9.2)^2 - (5.8)^2]
= 1.3 x 10^4 J
8. When a plate cracks, the crack is called a
These faults can store
just like a spring. When
this Is released, you get an
Answer:
an earthquake
Explanation:
the energy is being released
7. The Voyager 1 space probe was launched in the 1970's and is now the furthest
man-made object from earth - it has actually left the solar system. At its current speed it
could travel across the US, a distance of about 4500 km in 265 seconds (a little less
than 5 minutes!) What is its average speed in kilometers per second?
PLEASE HELP I NEED THE FORMULA AND ANSWER THANK YOU!!
Answer:
v = 16.98 km/s
Explanation:
Given that,
Distance, d = 4500 km
Time, t = 265 s
We need to find its average speed. The total distance covered divided by total time taken is called average speed of an object. So,
[tex]v=\dfrac{4500\ km}{265\ s}\\\\=16.98\ km/s[/tex]
So, the average speed is 16.98 km/s.
i’ll give brainliest!! please help and answer correctly! plsss answer quick
Answer: The motion of the object will remain the same
Explanation:
which of the following best defines unbalanced forces? A. Forces that act in opposite directions and cancel each other out B. Unequal forces that do not cancel out but cause a change in motion c. Foroes between two objects in physical contact D. The total force on an object after individual forces are added togethe
Answer:
Neseciti puntos oara mi tarea y mad ni entiendo lo wue dices
When rutherford bombarded thin gold foil with a-particles,he found that some a-particles were deflected through large angles. Which statement explains this deflection?
Answer:
the nucleus of the atom you have conserved almost all its mass in a very small volume
Explanation:
In Rutherforf's experiment, most alpha particles had few deflections, eg a few of them were deflected at small angles, a much smaller number deflected at large angles, and very few were deflected.
The explanation that I found for this is that if all the mass and the positive charge of the atom is in a small volume, they could specifically calculate this the relationship of the volumes,
V_atom / V_nucleo = 10⁴
Therefore, the phrase that explains the observing phenomenon is that the nucleus of the atom has concentrated almost all its mass, very small emolument and in that same volume is all the positive charge of the atoms.
In summary, the phrase that describes the process is:
the nucleus of the atom you have conserved almost all its mass in a very small volume
I WILL MARK YOU THE BRAINLIEST NO LINKS
The weight of the fluid that an object displaces is equal to the buoyant force acting on the object is
spring force
Archimedes Principle
buoyant force
Hooke's Law
Answer:
Archimedes' Principle
Explanation:
Its because Archimedes' Principle states "that the buoyant force on an object is equal to the weight of the fluid displaced by the object.... If you want to know the buoyant force on an object, you only need to determine the weight of the fluid displaced by the object."
THIS IS MY EXAM HURRY PLS
Which is a way that the elements are grouped on the periodic table? (2 points) a Elements in the same row have the same number of protons. b Elements with similar bonding properties are in the same column. c Elements in the same column have the same number of neutrons. d Elements with similar mass are placed in the same column.
Answer:
elements in the same column have the same number of neutrons. elements with similar mass are placed in the same column.
A 80 kg person buys a scale at a mall that reads weight in Newtons and can’t wait to try it out, so they open the scale on an elevator. What would the scale read if the elevator was moving upward at 6.2 m/s2?
Answer:
The scale read 1280 N.
Explanation:
Given that,
The mass of a person, m = 80 kg
We need to find the scale reading when the elevator is moving upward at 6.2 m/s².
We know that, when an elevator moves up, the reading on the scale is given by :
N-mg=ma
N=m(a+g)
Put all the values,
N = 80(6.2+9.8)
= 80(16)
= 1280 N
Hence, the scale read 1280 N.
Many smoke detectors use americium-241to detect very small particulates in the air. This is done by using a stream of radioactive particles that can be stopped by the small smoke particulate. Which type of radiation is MOST LIKELY used in a smoke detector, as it can be stopped by something this small?
a
neutrons
b
beta particles
c
alpha particles
d
gamma radiation
Answer: C.) Alpha Particles
Explanation: Just took it <3
The speed limit on many roads in a town 13.5 m/s outside schools this is limit is often reduced by one third
calculate the reduced speed limit
Answer:
4.5 m/s
Explanation:
13.5 x 1/3
the volume of the container was 2.5 L at a temperature of 350K. At what temperature will the volume of the container be double its initial value, knowing that pressure remains constant ? (Find the temperature in Celsius ) Show your work below.
Answer:
Explanation:
Given the following data;
Initial volume = 2.5 L
Initial temperature = 350 K
Final volume = 2V1 = 2*2.5 = 5 L
To find the final temperature, we would use Charles law;
a group of engineers have launched a space probe from earth that will land on the surface of Mars. how will the force of gravity from mars affect the space probe?
A) the force of gravity from Mars will not pull on the space probe until it reaches the planets surface.
B) the force of gravity from Mars will stop pulling on the space probe when it reaches the planet
C) the force of gravity from Mars will pull more strongly on the space probe as it gets closer to Mars.
D) the force of gravity from Mars will pull on the space probe the same amount no matter how far away it is
Answer:D
Explanation:
The force of gravity from Mars will pull on the space probe the same amount no matter how far away it is, so option D is correct.
What is gravity?All material objects in the universe are subject to the force of gravity, also known as gravitation. The force of gravity tends to draw any two non-zero mass objects or particles toward one another. Subatomic particles and galaxy clusters are both affected by gravity, as are objects of all sizes.
Due to the law of gravity, or gravitation, which draws all objects with mass in its vicinity toward it, Mars' gravitation is a natural occurrence. Due to the planet's lesser mass, its gravity is weaker than that of Earth. On Mars, the gravitational acceleration fluctuates, but on average it is 3.72076 m/ s² (or around 38% of Earth's).
Therefore, the force of gravity from Mars will pull on the space probe the same amount no matter how far away it is.
To know more about gravity:
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which types of change observe the law of conservation of mass? single answer
A. only changes of state
B. only physical changes
C. only chemical changes
D. physical changes and chemical changes
Answer:
d
Explanation:
d just because it is and it's talking about mass and physical match's up with mass
What is a scientific theory?
O Alaw that is always true
O A hypothesis about nature
O An educated guess based on observations
O An explanation of how the natural world works
Answer: An educated guess based on observations
Explanation: A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world.
Hope This Helps!
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Which of the following has 5 significant digits?
O 0.00030
O 50,000
O 100.0300
O 500.00
Answer:
50,000
Explanation:
when we say significant digits we mean the numbers that matter when stating the value of the number.
0.00030 can be written as 0.0003 without affecting it's value, the last zero is not significant.
50,000 all of the numbers here are significant to its value if we take away a zero it becomes 5,000 which is not equal to 50,000. so every digit here is significant
100.0300 can be written as 100.03 without loosing any value
500.00 can be written as 500 without loosing any value. ( think of this as $500.00, this also equals $500)
PLEASE HELP!! NO LINKS OR RANDOM WORDS!! If you were looking at the Moon from space (so that you could see all sides of it), how much of it would be lit by the sun at any given time?
1) All of it
2) Half of it
3) It varies depending on the Moon's phase.
4) It varies depending on the time of the year.
Answer:
3) It varies depending on the Moon's phase.Explanation:
The speed limit on many roads in a town 13.5 m/s outside schools this is limit is often reduced by one third
calculate the reduced speed limit
Answer:
9 m/s
Explanation:
13.5 × [tex]\frac{2}{3}[/tex] = 9
A +6.33 uC charge q1 is attracted by a force of 0.115 N to a second charge q2 that is 1.44 m away. What is the value of q2?
Answer:-4.1858
Explanation: I hate Acellus
If A +6.33 μC charge q₁ is attracted by a force of 0.115 N to a second charge q2 that is 1.44 m away. then the value of q₂ = 4.23 μC.
What is coulomb's law ?Electrostatic force is a force of attraction or repulsion between two unlike or like charges respectively. when like charges come closer to each other, they gets repel by one another and it gets attracted for unlike charges. Force of attraction or repulsion between two point charges are given by coulomb's law. The force of attraction between two charges are given by coulomb's law.
the law states that the force of attraction or repulsion between two point charges is directly proportional to product of magnitude of both the charge and inversely proportional to square of the distance between them.
i.e. F ∝ q₁q₂
F ∝ 1/r²
F ∝ q₁q₂/r²
F = kq₁q₂/r²
where k is proportionality constant k = 1/4π∈₀ = 8.9×10⁹
In this problem,
Given,
q₁ = 6.33×10⁻⁶ C
F = 0.115N
r = 1.44m
q₂ = ?
putting this values in the equation,
0.115 = 8.9×10⁹×6.33×10⁻⁶ ×q₂÷1.44²
q₂ = 4.23 μC.
To know more about charge :
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how is grounded theiry different from other qualitative research methods?
Answer:
(u mean theory* i think)
Grounded theory differs from either qualitative content analysis or thematic analysis because it has its own distinctive set of procedures, including theoretical sampling and open coding. In contrast, the procedures in the other two are not specified at the same level of detail.
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If Europium (Eu) undergoes proton decay and loses 3 protons, which element will it become?
Answer:
Neodymium (Nd)
Explanation:
An element is made up of atom, which contains three subatomic particles namely; proton, electron, and neutron. In a neutral atom, the number of protons determines the atomic number of that element and the atomic number of an element is the identity of that element in the periodic table.
Hence, a change in the proton number of an element means a change in the atomic number and ultimately a change of that element. In this question, Europium (Eu) element with atomic number, 63, loses three protons. This means that that atom now has 60 protons, which denotes the atomic number of another element called Neodymium (Nd).
Therefore, Europium (Eu) element has become Neodymium (Nd) due to loss of protons.
What is the total resistance of the circuit shown below?
Answer:
R = 12 ohm
Explanation:
Resistance are in parallel
1 ÷ Resistance = 1 ÷ 20 + 1 ÷ 30
1/R = 50/600
1/R = 1/12
R = 12 ohm
Two resistors, R1 and R2, are
connected in parallel. R1 = 35.0
ohms, and the equivalent resistance
of the combination is 14.5 ohms.
What is the value of R2?
(Unit = ohm)
Answer:
The value of R₂ is equal to 24.75 ohms.
Explanation:
Given that,
Two resistors, R₁ and R₂, are connected in parallel.
The equivalent resistance is 14.5 ohms
We need to find the value of R₂.
When two resistors are connected in parallel. The equivalent resistance is given by :
[tex]\dfrac{1}{R_{eq}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}\\\\\dfrac{1}{14.5}=\dfrac{1}{35}+\dfrac{1}{R_2}\\\\\dfrac{1}{R_2}=\dfrac{1}{14.5}-\dfrac{1}{35}\\\\\dfrac{1}{R_2}=0.04039\\\\R_2=\dfrac{1}{0.04039}\\\\R_2=24.75\ \Omega[/tex]
So, the value of R₂ is equal to 24.75 ohms.