Explanation:
a couple is a system of forces with a resultant moment but no resultant force. A better term is force couple or pure moment. Its effect is to create rotation without translation, or more generally without any acceleration of the centre of mass.
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.
The pattern of isobars are used to depict the location of high and low ________ areas on a weather map.
Answer:
Pressure
Explanation:
Weight and baro is bar which is latin for weight
Answer:
As the other said it was weather
Explanation:
I got it correct on edge and I'm in a timed test so unable to explain give other person brainliest if you haven't
Hope this helped!
Stay safe!
Please answer fast
A 50 kg boy jumps off the front of a 1.5 kg skateboard moving forward. Find the skateboard's velocity
immediately after the boy jumps, assuming that the skateboard's initial velocity is 3.5 m/s and the boy's
velocity when jumping off the front is 5 m/s?
Answer:
The speed is 1.35 m/s
Explanation:
(m1+m2) vi= m1+m2v2
(50+1.5) (3.5)=50 (5+v2) +1.5 v2
180.25= 250+ 51.5 v2
180.25- 250+ 51.5 v2
-69.75= 51.5 v2
v2= -1.35 m
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.
What is the electrical energy of a 750 W waffle iron that is used for 15 min *
Answer:
675 kj
Explanation:
Energy = power × time
Energy = 750 × 15min
Energy = 750× 15 × 60 sec
Energy = 675000 joules = 675 kilo joules
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.
Which force below does the most work? All three displacements are the same. The 10 N force. The 8 N force The 6 N force. They all do the same work. Sin60º = 0.87 cos60º = 0.50
THe question is missing parts. Here is the complete question.
Which force below does the most work? All three displacements are the same.
A. The 10 N force
B. The 8 N force
C. The 6 N force
D. They all do the same work
note: sin60° = 0.87
cos60° = 0.5
Answer: C. The 6 N force
Explanation: Work (τ) is the transfer of energy to or from a system by moving an object.
Work is dependent of the force we applied to the object, the displacement it creates and the angle between the force and the displacement. In other words:
[tex]\tau = F.d.cos \theta[/tex]
and its unit is joule [J].
For the 10 N force, angle is 90°. Cosine of 90° is 0. Therefore:
[tex]\tau = 10.d.cos 90[/tex]
[tex]\tau = 0[/tex]
For the 8 N force, angle is 60°. Then:
[tex]\tau = 8.d.cos 60[/tex]
[tex]\tau = 8d(0.5)[/tex]
[tex]\tau = 4d[/tex]
For the 6 N force, angle is 0, because vectors displacement and force are pointing to the same direction:
[tex]\tau = 6.d.cos 0[/tex]
[tex]\tau=6d(1)[/tex]
[tex]\tau=[/tex] 6d
Comparing the work done, the force that does the most work is force 6N.
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.
To learn more about the electric bulb, refer to the link;
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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
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.
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
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 change in the thermal energy can cause other changes to occur in the
substance. Which of the following could occur as a result of decreasing
the thermal energy of a gas? *
Answer:
The gas will change to a liquid
Explanation:
Basically condensation happens
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:
Two people travel from Columbus to Cleveland, one by car at an average velocity of 90km/h, and one by plane at an average velocity of 300km/h. Can their displacements be equal
Answer:
Explanation:
Yes , their displacement may be equal .
Suppose the displacement is AB where A is starting point and B is end point .
The car is covering the distance AB by going from A to B on straight line . On the other hand plane goes from A to C , then from C to D and then from D to B . In this way plane reaches B from A on a different path which is longer than path of the car . In the second case also displacement of plane is AB . In the second case distance covered is longer but displacement is same that is AB .
Amoeba have mitochondria. What is the name of the process that breaks down glucose sugar into usable energy for the cell? (2 words)
Answer:
cellular respiration
Explanation:
help please asappp.
Answer:
Radio
Explanation:
As the stonger the waves get the more compressed they get
Light from the sun travels in electromagnetic waves. Which of these statements describe electromagnetic waves?
Complete Question:
Light from the sun travels in electromagnetic waves. Which of these statements describe electromagnetic waves? Choose the 3 that apply.
Group of answer choices.
a) consist of transverse wave patterns.
b) can move through a vacuum.
c) caused by a vibration in a medium.
d) consist of longitudinal wave patterns.
e) requires a medium, such as air, to travel.
f) made of vibrating electric and magnetic fields.
Answer:
a) consist of transverse wave patterns
b) can move through a vacuum
f) made of vibrating electric and magnetic fields
Explanation:
Electromagnetic waves is a propagating medium used in all communications device to transmit data (messages) from the device of the sender to the device of the receiver.
Generally, the most commonly used electromagnetic wave technology in telecommunications is light and radio waves. Light from the sun travels in electromagnetic waves.
The statements which describe electromagnetic waves are;
I. It consist of transverse wave patterns.
II. It can move through a vacuum.
III. It is made of vibrating electric and magnetic fields.
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
Read more on electric field here: https://brainly.com/question/14372859
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what factors affect electrostatic force?
Answer:
The first factor is the amount of charge on each object. The greater the charge, the greater the electric force. The second factor is the distance between the charges. The closer together the charges are, the greater the electric force is.
Explanation:
Please Help!
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
Learn more about magnetic force:
https://brainly.com/question/10353944?referrer=searchResults
Is the answer is right?
Answer:
Yes please
Explanation:
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
Calculate the kinetic energy of a 20-kg sled moving 28.0 m/s. Show your work in the space to the right.
Answer:
7840
Explanation:
K.e=1/2mv^2
=1/2(20)(28.0)^2
=7840J
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.
Refraction occurs when a wave changes______ as it passes through a different medium.
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 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
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.
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: