Answer:
Sunspots are magnetic in nature. They are the places ("active regions") where the Sun's magnetic field rises up from below the Sun's surface and those magnetic regions poke through. ... Sunspots are formed continuously as the Sun's magnetic field actively moves through the Sun.
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30. A duck flying due east passes over Atlanta, where the magnetic field of Earth is 5.0 x 10-5 T directed north. The duck has a positive charge of 4.0 x 10-8 C. If the magnetic force acting on the duck is 3.0 x 10-11 N upward, what is the duck's velocity?
Answer:
5 m/s
Explanation:
hope it helps:) u're welcome
The velocity of the duck must be 15 m/s towards the east which is explained below.
Magnetic force:The force on a moving charge with some velocity under a magnetic field is given by:
F = qv×B
here q is the charge on the object
v is the velocity of the object
B is the magnetic field
v×B gives the direction of the force
B is towards the north, and Force is directed upwards, then velocity v should be towards the east.
3×10⁻¹¹ = 4×10⁻⁸× v × 5×10⁻⁵
v = 15 m/s
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What is the electric field created by a voltage of 85 V at a distance of 5.0 m?
Answer:
E = = 17
Explanation:
We will use the equation E = We plug in our known values
8
Select the correct answer.
Which sentence correctly states Boyle's law?
ОА
The pressure on a gas varies inversely with its volume at constant temperature.
OB. The pressure on a gas varies directly with its volume at constant temperature.
Ос.
The pressure on a gas varies directly with its temperature at constant volume.
OD
The pressure on a gas varies inversely with its temperature at constant volume.
OE. The volume of a gas varies directly with its temperature at constant pressure.
what do you think will happen to Charlie now that he is smart? Explain.
It is recommended that children have no more than two sets of dental X-rays per year. Although X-rays have many benefits, they can be dangerous to human health because they are
Although X-rays have many benefits, they can be dangerous to human health because they are short wavelength, high frequency, with photons sufficiently energetic to damage DNA molecules.
what is spring constant
Answer:
sping constant is the force needed to stretch or compress a string
The formula:
Fs=-kx
Fs= force
k= spring constant
x= amount of extension
An object is 10 m above Earth’s surface, and has a potential energy of 490 joules. What is the object’s mass?
Explanation:
Taking g=10m/s²
P.E= mgh
490J= m×10×10.
490J=100m
m. = 490J/100
m. =4.9kg
Why do temperatures on the moons surface vary ncyb more than temperatures on earth
The moon has a lord density than earth
The moons surface has more craters than earth
The moon has no atomsphere
The moon is farther from the sun compared to earth
Answer:
The moon has no atmosphere
Explanation:
The temperatures on the surface of the Moon vary much more than those on Earth because the moon has no atmosphere (third answer in the list), and therefore there are no molecules that could retain residual heat and make the change from day to night a softer transition.
Question 7 of 15
Solids have a definite shape and volume.
A. True
B. False
SUBI
Answer:
A. True it's right solids have a definite shape and volume.
A projectile of mass 0.2 kg and an initial velocity of 50 m/s collides with the end of a blade attached to a turbine. The rotational inertia of the turbine is 12.5 kg⋅m2 . Assume the loss of energy of the projectile in the collision is completely transferred to the blades, causing them to spin. If the final rebound velocity of the projectile after hitting a turbine blade is −25 m/s , which of the following is most nearly the rotational velocity of the turbine after the collision?
Answer:
5.5 rad/sec
Explanation:
Answer:
5.47 rad/s
Explanation:
We can solve this problem using the principle of conservation of energy and angular momentum.
First, let's find the initial kinetic energy of the projectile:
K1 = (1/2) * m * v1^2
= (1/2) * 0.2 kg * (50 m/s)^2
= 250 J
where v1 is the initial velocity of the projectile.
Next, let's find the final kinetic energy of the projectile:
K2 = (1/2) * m * v2^2
= (1/2) * 0.2 kg * (-25 m/s)^2
= 67.5 J
where v2 is the final velocity of the projectile after the collision.
The loss of energy in the collision is:
ΔK = K1 - K2
= 187.5 J
This energy is transferred to the blades, causing them to spin. Let's assume that all of this energy is converted to rotational kinetic energy of the turbine.
The final rotational kinetic energy of the turbine is:
K_rot = (1/2) * I * ω^2
where I is the moment of inertia of the turbine and ω is the final rotational velocity of the turbine.
Using the conservation of energy, we can equate the loss of kinetic energy in the collision to the gain in rotational kinetic energy of the turbine:
ΔK = K_rot
187.5 J = (1/2) * 12.5 kg m^2 * ω^2
ω^2 = (2 * 187.5 J) / (12.5 kg m^2)
ω^2 = 30
ω = 5.47 rad/s
Therefore, the rotational velocity of the turbine after the collision is 5.47 rad/s.
Why did you need a permanent magnet? What do you think would happen if you increased the
number of permanent magnets? (dc motor)
Permanent magnets are important for their industrial uses especially when it comes to power generation and electric motors. The induction process for turbines and generators needs permanent magnets to turn mechanical motion into energy.
Exposing magnetized magnets to opposing external fields produces a demagnetizing effect. This effect is most apparent in permanent magnet materials having a non-linear demagnetization curve, such as Alnico. ... Other factors such as SHOCK and VIBRATION have very little effect on today's permanent magnet materials.
Collate the electrical force between and electrons and protons in an atom that are separated by distance of 5.9 e -11m
Answer:
The electrical force between the electrons and protons in the atom is 6.62 x 10⁻⁸ N.
Explanation:
Given;
distance between the electron and proton, r = 5.9 x 10⁻¹¹ m
charge of electron, q₁ = -1.6 x 10⁻¹⁹ C
charge proton, q₂ = +1.6 x 10⁻¹⁹ C
The electric force between the two particles is calculated by Coulomb's law;
[tex]F = \frac{k|q_1|q_2|}{r^2} \\\\F = \frac{(9\times 10^9) \times (1.6\times 10^{-19})^2}{(5.9\times 10^{-11})^2} \\\\F = 6.62 \times 10^{-8} \ N[/tex]
Therefore, the electrical force between the electrons and protons in the atom is 6.62 x 10⁻⁸ N.
The electric circuit below consists of a battery, a switch, and three light bulbs.
What will happen if the switch is closed and Bulb A is removed?
a. Bulbs B and C will go out.
b. Bulbs B and C will remain lit.
c. Bulb B will remain lit, and Bulb C will go out.
d. Bulb C will remain lit, and Bulb B will go out.
Answer :B: Bulbs B and C will remain lit.
If the switch is closed and Bulb A is removed, Bulbs B and C will remain lit. Option B is correct.
What is an electric bulb?An electric bulb is a gadget that uses electricity to create visible light. It is the most popular type of artificial lighting and is necessary for modern society.
The light bulb is connected to a switch in a parallel configuration. The switch is open, which means there will be a lot of resistance and no current will flow via this route.
Across the parallel connection, the battery would create the same potential difference. Because the current would not go via the open switch, it would instead flow through the light bulb, causing it to illuminate.
If the switch is closed, the circuit get completed, hence the current starts flowing in the circuit and the bulb start glowing.
When one bulb in a series circuit is removed out, the rest of the bulbs stop shining and shut off.
But if bulb A is removed,in that condition the only connected bulb can glow. If the switch is closed and Bulb A is removed, Bulbs B and C will remain lit.
Hence, option B is correct.
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If a car is traveling 103 miles per hour, how many miles and how much time would it take for another car to catch up to them from a complete stop?
Answer:
Required distance is 103 miles and the required time is 1 hour
Explanation:
Given;
speed of the car, v = 103 miles per hour
Speed is the given as the ratio of distance traveled to time taken for the motion.
The distance it will take another car to catch up to them from a complete stop is 103 miles and the time it will take the car is 1 hour.
Therefore, required distance is 103 miles and the required time is 1 hour.
In a Millikan experiment, a droplet of mass 4.7 x 10^-15 kg floats in an electric field of 3.20 x 104 N/C.
a. What is the force of gravity on this droplet?
b. What is the electric force that balances it?
c. What is the excess charge?
d. How many excess electrons are there on this droplet?
Answer:
a. The force of gravity on the droplet is approximately 4.606 × 10⁻¹⁴ Newtons
b. The electric force that balances the force of gravity is approximately -4.606 × 10⁻¹⁴ Newtons
c. The excess charge is approximately -1.439375 × 10⁻¹⁸ C
d. There are approximately 9 excess electrons on the droplet
Explanation:
The parameters of the Millikan experiment are;
The mass of the droplet, m = 4.7 × 10⁻¹⁵ kg
The electric field in which the droplet floats, E = 3.20 × 10⁴ N/C
a. The force of gravity on the droplet, F = The weight of the droplet, W = m × g
Where;
g = The acceleration due to gravity ≈ 9.8 m/s²
W = 4.7 × 10⁻¹⁵ kg × 9.8 m/s² = 4.606 × 10⁻¹⁴ Newtons
∴ The force of gravity on the droplet = W = 4.606 × 10⁻¹⁴ Newtons
b. The electric force that balances the force of gravity, [tex]F_v[/tex] = -W = -4.606 × 10⁻¹⁴ Newtons
c. The excess charge is given as follows;
[tex]F_v[/tex] = q·E
∴ The electric force that balances the force of gravity, [tex]F_v[/tex] = q·E = -4.606 × 10⁻¹⁴ N
q·E = -4.606 × 10⁻¹⁴ N
q = -4.606 × 10⁻¹⁴ N/E
∴ q = -4.606 × 10⁻¹⁴ N/(3.20 × 10⁴ N/C) ≈ -1.439375 × 10⁻¹⁸ C
The excess charge, q ≈ -1.439375 × 10⁻¹⁸ C
d. The charge of one electron, e = 1.602176634 × 10⁻¹⁹C
The number of excess electrons in the droplet, n, is given as follows;
n = 1.439375 × 10⁻¹⁸ C/(1.602176634 × 10⁻¹⁹C) = 8.98387212405 electrons
∴ n ≈ 9 electrons.
a. The force of gravity on this droplet is [tex]4.606 \times 10^{-14} \;Newton[/tex]
b. The electric force that balances this droplet is [tex]-4.606 \times 10^{-14} \;Newton[/tex]
c. The excess charge is equal to [tex]-1.44 \times 10^{-18}\;C[/tex]
d. The number of excess electrons that are on this droplet is 9.0 electrons.
Given the following data:
Mass of droplet = [tex]4.7 \times 10^-15 \;kg[/tex]Electric field = [tex]3.20 \times 10^4 \;N/C.[/tex]Scientific data:
Acceleration due to gravity = 9.8 [tex]m/s^2[/tex]Charge of electron = [tex]1.6 \times 10^{-19}\;C[/tex]The parameters of an electric field.a. To calculate the force of gravity on this droplet:
The force of gravity on this droplet is equal to the weight of the droplet and it would be calculated by using this formula:
[tex]F = mg\\ \\ F = 4.7 \times 10^{-15} \times 9.8\\ \\ F = 4.606 \times 10^{-14} \;Newton[/tex]
b. To calculate the electric force that balances this droplet:
The electric force that balances this droplet is equal to the negative weight of the droplet.
[tex]F_e = -mg = -4.606 \times 10^{-14} \;Newton[/tex]
c. To calculate the excess charge:
Mathematically, the excess charge is given by this formula:
[tex]q=\frac{F_e}{E} \\ \\ q=\frac{-4.606 \times 10^{-14}}{3.2 \times 10^4} \\ \\ q=-1.44 \times 10^{-18}\;C[/tex]
d. To calculate the number of excess electrons that are on this droplet:
[tex]n=\frac{1.44 \times 10^{-18}}{1.6 \times 10^{-19}} [/tex]
n = 9.0 electrons
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pls help me with this
Answer:
I can't see it because it's too blury. try to search it
Which of the following waves in the electromagnetic spectrum do all objects emit?
Radio Waves
Infrared Waves
Visible Light waves
Ultraviolet Waves
please answer ASAP
Answer:
radio waves
Explanation:
Answer:
the answer is A radio waves
A string can withstand a force of 135 N before breaking. A 2.0 kg mass is tied to the string and whirled in a
horizontal circle with a radius of 1.10 m. What is the maximum speed that the mass can be whirled at before
the string breaks?
The mass would have centripetal acceleration a given by
a = v ² / R
where
v = tangential speed of the mass
R = length of the string
By Newton's second law, a maximum tension of F = 135 N would apply an acceleration of
135 N = (2.0 kg) a → a = 67.5 m/s²
which requires a tangential speed v of
67.5 m/s² = v ² / (1.10 m) → v = √((67.5 m/s²) (1.10 m)) ≈ 8.62 m/s
state two possible changes that cause a larger e.m.f to be induced
There are therefore three ways an emf can be induced in a loop: Change the magnetic field. Change the area of the loop. Change the angle between the field and the loop.
As the area decreases, the magnetic flux will also be decreased. As a result, the induced emf will be increased.
What is meant by induced emf ?Whenever the magnetic flux associated with a circuit is changed, an emf will be induced in it. This is called induced emf.
Here,
The value of induced emf is the rate of change of magnetic flux.
So, the induced emf,
ε = -dФ/dt
The negative sign indicates that the induced emf always opposes the change in flux.
Magnetic flux, Ф = NBA cosθ
So, ε = d(NBA cosθ)/dt
There are certain changes that can cause a larger emf to be induced:
1) By decreasing the magnetic field in the conductor.
As the magnetic field in the conductor decreases, the magnetic flux associated with it also decreases.
Therefore, according to Lenz's law, the induced emf will be increased.
2) By decreasing the area of cross-section of the conductor.
As the area decreases, the magnetic flux will also be decreased. As a result, the induced emf will be increased.
Hence,
As the area decreases, the magnetic flux will also be decreased. As a result, the induced emf will be increased.
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How do the electrons move in a metal that is magnetized?
Answer:
A attractive field pulls and pushes electrons in certain objects closer to them, making them move. Metals like copper have electrons that are effortlessly moved from their circles. In case you move a magnet rapidly through a coil of copper wire, the electrons will move - this produces power.
Kate is pulling her doll in a wagon. Which arrow shows us the force of Kate pulling the wagon?
Answer:
3
Explanation:
Trust me its the right answer
Bedrock that is closer to oceanic ridges is younger in age than bedrock that is farther away. What can best be concluded from this
information
In which reaction are the atoms of elements rearranged?
A. a neutron fuses with plutonium-239 to form plutonium-240.
B. two isotopes of hydrogen fuse to form helium.
C. sodium combines with chlorine to form sodium chloride.
D. uranium-235 breaks apart into krypton, barium, and three neutrons.
Answer:
C. sodium combines with chlorine to form sodium chloride
Explanation:
Answer:
C. sodium combines with chlorine to form sodium chloride.
Explanation:
Refraction occurs when a wave changes______ as it passes through a different medium.
The Himalayas occur at white type of tectonic plate boundary?
Answer:
Explanation:
The Himalayan mountain range and Tibetan plateau have formed as a result of the collision between the Indian Plate and Eurasian Plate which began 50 million years ago and continues today. 225 million years ago (Ma) India was a large island situated off the Australian coast and separated from Asia by the Tethys Ocean.
as the broadcaster speakers the sound wave being produced by
Answer:
In electronics and telecommunications a transmitter or radio transmitter is an electronic device which produces radio waves with an antenna. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna
Explanation:
What differences do you notice in your body and attitude on the days that you move/exercise compared to the days that you don't?
Answer:
Day when I workout I feel I have more energy, but on days when I don't I feel sluggish and tired
What is the momentum of a 750-kg Volkswagen Beetle when at rest? Value: Unit:
Answer:
p = 0
Explanation:
Given that,
Mass of beetle, m = 750 kg
It was rest. It means its speed is equal to 0.
The momentum of an object is equal to the product of mass and velocity. So,
p = mv
p = 750 × 0
p = 0 kg-m/s
So, the momentum of the beetle is 0 kg-m/s.
help please asappp.
Answer:
Radio
Explanation:
As the stonger the waves get the more compressed they get
how can hand tools help every technician for their safety in doing hard servicing activities
Answer: Hand tools are necessary for daily activities.
Explanation:
The hand tools are useful for day to day activities they aid in pouring substances, holding things, mixing substances, cleaning and for other purposes. In a chemical laboratory the hand tools like test tube holders can help in holding the chemicals. In a medical laboratory the forceps can be useful in holding and cutting the sections without causing any harm to the hands. Hand tools avoid the direct contact with the microorganisms in medical laboratory thus protect against infections. Hand tools aid in surgical operations and they help in avoiding direct contact with the blood vessels and organs preventing contamination and infections.