Answer:
The north pole of an electromagnet placed in the center of a permanent magnet repels the north pole of the permanent magnet.
Explanation:
The commutator of the electric motor reverses the current in each half revolution to keep the torque, turning the coil in the same direction. This occurs as the north pole of the electromagnet nears the south pole of the permanent magnet, and the current reverses, which causes the poles of the magnets to repel.
Thus, the correct answer is "the north pole of an electromagnet placed in the center of a permanent magnet repels the north pole of the permanent magnet".
Answer:
The answer is D
Explanation:
Just took the test on Edge :)
If you want to The Midoriya Talent show then Anyone Is welcome Pls show your talents then the ID is 999-8470-3327 and the Password is 355130
Answer:
it is of brainlee
I'd and also a password
I want to save it because my phone battery is low so don't delete my answer
An electric motor takes 30 s to lift a box of mass 45 000g to a height of 1.7 m. Calculate the power of the electric motor.
Power P is the amount of energy E transferred or converted per unit time t, and is expression is:
P = E/t
The necessary energy to lift the box its the work of against the Gravity Force, and is given by:
E = mgh
Then the power is:
P = E/t
P = mgh/t
P = (45 kg)(9.8 m/s²)(1.7 m )/ 30
P = 24.99 W
P ≈ 25 WA ball is thrown in the air at an angle of 60.0° to the ground, with an initial speed of 30m/s. How far from its original position does it land?
Answer:
A student is conducting a pendulum experiment. Which of the following pieces of safety equipment would be the most vital to conduct this test?
Explanation:bkdbjkfej jf jfekjwniorigoexhndvgkj...............aplokdiuhyfgbv ..............................................
jujuju on da beati dont knowww
Answer:
The answer is Juju knows. Pplease mark as solved and thanks
Explanation:
Answer
Explanation:
Answer
Explanation:Answer
Explanation:Answer
Explanation:Answer
Explanation:Answer
Explanation:
what do illusions indicate about the relationship between our eyes and brains
Answer:
Illusions indicate that the brain does not totally rely on the eye to make visual perceptions of reality. It sometimes generates perceptions of reality based on assumptions of how it should be.
Explanation:
Our brains and eyes together with the optical nerves linking them together, form part of the complex visual system of the body.
An illusion occurs when there is a mismatch between the perceived reality by the brain and the actual reality of what exists. Whenever this happens, it shows that some of the time, the brain does not always rely on a complete optical signal/information from the eye in order to make a perception. The brain at times tends to "complete the image" using the little information available alongside personal experiences and this often leads to misperception.
Why is the sun so far away
Answer:
If it was close we would die.
Explanation:
Probably has something to do with the earths original formation.
An incompressible fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8.8 cm is 2.4 m/s. Calculate the flow speed at a location where the diameter has narrowed to 5.80 cm
Answer:
The value is [tex]v_2 = 5.53 \ m /s[/tex]
Explanation:
From the question we are told
The pipe diameter at location 1 is [tex]d = 8.8 \ cm = \frac{8.8 }{10} = 0.88 \ m[/tex]
The velocity at location 1 is [tex]v_1 = 2.4 \ m /s[/tex]
The diameter at location 2 is [tex]d_2 = 5.80 \ cm = 0.58 \ m[/tex]
Generally the area at location 1 is
[tex]A_1 = \pi * \frac{d^2}{ 2}[/tex]
=> [tex]A_1 = \pi * \frac{0.88^2}{ 2}[/tex]
=> [tex]A_1 = 3.142 * \frac{0.88^2}{ 2}[/tex]
=> [tex]A_1 = 1.2166 \ m^2[/tex]
Generally the area at location 1 is
[tex]A_2 = \pi * \frac{d_1^2}{ 2}[/tex]
=> [tex]A_2 = \pi * \frac{0.58^2}{ 2}[/tex]
=> [tex]A_2 = 0.528 \ m^2[/tex]
Generally from continuity equation we have that
[tex]A_1 * v_1 = A_2 * v_2[/tex]
=> [tex]1.2166 * 2.4 = 0.528 * v_2[/tex]
=> [tex]1.2166 * 2.4 = 0.528 * v_2[/tex]
=> [tex]v_2 = 5.53 \ m /s[/tex]
If an object has more mass then it will have...
A: less intertia
B: more inertia
C: more volume
D: less volume
You pull a 70-kg crate at an angle of 30° above the horizontal. If you pull with a force of 600N and the coefficient of kinetic friction is .4, how far will it move in 3 seconds?
Answer:
Explanation:
Force of friction acting on the body = μ mg cosθ
= .4 x 70 x 9.8 x cos30
= 237.63 N
component of weight = mgsinθ
= 70 x 9.8 x sin30
= 343 N
Net upward force = 600 - mgsinθ - μ mg cosθ
= 600 - 343 - 237.63
= 105.37 N
acceleration in upward direction = 105.37 / 70
= 1.5 m /s²
s = ut + 1/2 a t²
= 0 + .5 x 1.5 x 3²
= 6.75 m .
The crate will move at a distance of 1.215 m in 3 seconds.
How do you calculate the distance of motion?Given that the mass m of the crate is 70 kg and the angle above the horizontal is 30°. External force F on the crate is 600 N and the coefficient of friction is 0.4.
The friction force applied to the crate is calculated as given below.
Friction force = [tex]\mu mgcos \theta[/tex]
Where [tex]\mu[/tex] is the friction constant, g is the gravitational acceleration and [tex]\theta[/tex] is the angle above the horizontal.
Friction Force = [tex]0.4\times 70\times 9.8\times cos30^\circ[/tex]
Friction force = 237.63 N.
There is a force applied on the crate due to its weight is calculated as given below.
Force (weight component) = [tex]mgsin\theta[/tex]
Force (weight component) = [tex]70\times 9.8\times sin 30^\circ[/tex]
Force (weight component) = 343 N.
The net force applied to the crate is given below.
Net force = External force - friction force - force (weight component)
Net force F' = [tex]600 - 237.63 - 343[/tex]
Net force F' = 19.37 N.
The acceleration of the crate can be calculated as given below.
[tex]a = \dfrac {F'}{m}[/tex]
[tex]a =\dfrac {19.37}{70}[/tex]
[tex]a = 0.27 \;\rm m/s^2[/tex]
Hence the distance traveled by the crate in 3 seconds is calculated by the formula given below.
[tex]s = ut + \dfrac {1}{2} at^2[/tex]
Where, s is the distance, u is the initial velocity, a is the acceleration and t is the time of motion of the crate.
[tex]s = 0\times 3 + \dfrac {1}{2} \times 0.27 \times 3^2[/tex]
[tex]s = 1.215[/tex]
Hence we can conclude that the crate will move a distance of 1.215 m in 3 seconds.
To know more about the force, follow the link given below.
https://brainly.com/question/26115859.
Solid state physics uses the. Theory to understand how the large-scale properties of solids result from their atomic scale structure
Answer:
Quantum theory
Explanation:
The scientific foundation in quantum mechanics is quantum theory, which describes the existence and behavior of mass and antimatter at the subatomic particles levels. Quantum theory and quantum theory are often related to as the existence and behavior of matter in the universe at that stage.
What causes the Earth's spherical shape
Answer:
spherical shape
Explanation:
The Earth is massive enough that the pull of gravity maintains its roughly spherical shape. Most of its deviation from spherical stems from the centrifugal force caused by rotation around its north-south axis. This force deforms the sphere into an oblate ellipsoid.
Acceleration and force are proportional
Answer:
whats the question tho
I would like to know why this is the correct answer
-Two rockets with the same mass are accelerated. Rocket A accelerates twice as quickly as rocket B. Which statement is correct?
*The motor in rocket A is twice as powerful as the motor in rocket B.
Answer:
Yah, the powerful the motor is, the greater the velocity.
Since velocity is directly proportional to momentum, rocket A will have a greater magnitude of momentum than rocket B.
In accordance to Newton's second law of motion, momentum accounts for acceleration force hence rocket A will have a greater force of acceleration than rocket B
What is the rms current flowing through a light bulb that uses an average power of 30.0 W when it is plugged into a wall receptacle supplying an rms voltage of 240.0 V
Answer:
0.125 A
Explanation:
From the question given above, the following data were obtained:
Power (P) = 30 W
rms voltage (Vrms) = 240 V
rms Current (Irms) =?
The power in an electric circuit is given by the following equation:
Power (P) = current (I) × voltage (V)
With the above formula, we can obtain the rms current flowing through the bulb as shown below:
Power (P) = 30 W
rms voltage (Vrms) = 240 V
rms Current (Irms) =?
P = Irms × Vrms
30 = Irms × 240
Divide both side by 240
Irms = 30 / 240
Irms = 0.125 A
Thus, the rms current flowing through the light bulb is 0.125 A
A 23 g bullet is accelerated in a rifle barrel 62 cm long to a speed of 593 m/s. Use the work-energy theorem to find the average force exerted on the bullet while it is being accelerated. Answer in units of N.
Answer:
The average force exerted on the bullet while it is being accelerated is 6,522.52 N.
Explanation:
Given;
mass of the bullet, m = 23 g = 0.023 kg
length of the barrel, L = 62 cm = 0.62 m
speed of the bullet, v = 593 m/s
Applying work-energy theorem;
the work done in accelerating the bullet in the riffle = kinetic energy acquired by the bullet.
W = K.E
F x d = ¹/₂mv²
where;
d is the is the distance traveled by the bullet in the riffle = L
F(0.62) = ¹/₂ x 0.023 x (593²)
F(0.62) = 4043.964
F = (4043.964) / (0.62)
F = 6,522.52 N
Therefore, the average force exerted on the bullet while it is being accelerated is 6,522.52 N.
Convert 1 x 10-3 nm to m. given: 1 m = 1,000,000,000 nm
Answer:
l m = 1000000000 nm
? = 0.001
= 0
A 15 kg cart is pushed on a frictionless surface from rest horizontally by a 30 N force. What is the cart's acceleration?
b. How far wil it travel in 10 seconds?
c. What is its velocity at the end of 10 seconds?
Answer:
a. The cart's acceleration is 2 m/s^2
b. The cart will travel 100 m
c. The speed is 20 m/s
Explanation:
a. The acceleration of the cart can be calculated using Newton's second law:
F = m.a
Solving for a:
[tex]\displaystyle a=\frac{F}{m}[/tex]
The cart has a mass of m=15 Kg and is applied a net force of F=30 N, thus:
[tex]\displaystyle a=\frac{30}{15}[/tex]
[tex]a=2\ m/s^2[/tex]
b.
Now we use kinematics to find the distance and speed:
[tex]\displaystyle x = v_o.t+\frac{at^2}{2}[/tex]
The cart starts from rest (vo=0). The distance traveled in t=10 seconds is:
[tex]\displaystyle x = 0*10+\frac{2*10^2}{2}[/tex]
[tex]x = 100\ m[/tex]
The cart will travel 100 m
c.
The final speed is calculated by:
[tex]v_f=0+2*10=20\ m/s[/tex]
The speed is 20 m/s
PLEASE HELP ITS DUE TODAY
A projectile is fired horizontally from a height of 10 m above level ground. The projectile lands a horizontal distance of 15 m from where it was launched.
-Find the hang time for the projectile.
-Find the initial speed of a projectile.
-What are the x and y components of the projectile’s velocity the moment before it strikes the ground?
-At what speed will the projectile strike the ground?
Answer:
30.9 m
Explanation:
x = 129.9 m y = 30.9 m First of all, let's calculate the horizontal and vertical velocities involved h = 50.0cos(30) = 43.30127 m/s v = 50.0sin(30) = 25 m/s The horizontal distance is simply the horizontal velocity multiplied by the time, so 43.30127 m/s * 3 s = 129.9 m So the horizontal distance traveled is 129.9 m, so x = 129.9 m The vertical distance needs to take into account gravity which provides an acceleration of -9.8 m/s^2, so we get d = 25 m/s * 3s - 0.5*9.8 m/s^2 * (3 s)^2 d = 75 m - 4.9 m/s^2 * 9 s^2 d = 75 m - 44.1 m d = 30.9 m So the vertical distance traveled is 30.9 m, so y = 30.9 m
A student walks 4 blocks east, 7 blocks west, 1 block east and then 2 blocks west in an hour what is their velocity
Answer:
4 blocks west is final displacement. So 4 blocks per hour
Hydropower is alternative source of energy
Answer:
Hydropower is an alternate source!Its expensive and takes up large spaces and many natural resources Takes homes of natural species.Answer:
because Hydropower is fueled by water, so it's a clean fuel source, meaning it won't pollute the air like power plants that burn fossil fuels, such as coal or natural gas. Hydroelectric power is a domestic source of energy, allowing each state to produce their own energy without being reliant on international fuel sources.
Explanation:
please mark as brainlest
Research Galileo’s work on falling bodies. What did he want to demonstrate? What opinions or theories was he trying to refute? What arguments did he use to persuade others that he was right? Did he depend on experiments, logic, findings of other scientists, or other approaches?
Answer:
Explanation:
Galileo's famous argument against the Aristotle's theory of falling bodies goes like this. "Let's say heavy objects do fall faster than light ones. Then it seems the heavier weight will fall with the lighter weight acting, as it were, a bit like a parachute. In that case, the two balls will together fall more slowly than the heavy weight would on its own. On the other hand, once the two weights are tied together and held out over the parapet, they have effectively combined their weights, becoming one greater weight... they must therefore fall even faster than the heavy weight would on its own." Contradiction. Hence weight has no effect on falling rates.
Some philosophers are very fond of this argument. Gendler uses it as a prototypical example of how "reasoning about particular entities within the context of an imaginary scenario can lead to rationally justified conclusions". Snooks goes further saying "it is striking that one leaves the falling balls example with something approaching certainty for its outcome". And Brown goes all the way and claims that Aristotle's theory is "self-contradictory", and we gain a priori knowledge here. The argument does give off that flavor of "synthetic a priori" reasoning, as in geometry but without images. But is it a proof or a fallacy? Even Gendler admits that some "obvious" premises are missing, and Atkinson even calls it a "non-sequitur" for similar reasons. But Galileo's logic is not questioned it seems. Shouldn't it be?
Galileo proved force causes acceleration. Galileo concluded from the law of parabolic fall that bodies fall on Earth at a constant acceleration and that gravity, which pulls all bodies down, is constant.
What is Galileo's law of falling bodies?According to Galileo's law of free fall, in the absence of any resistance from the air, all bodies fall with the same acceleration, regardless of their mass. This law was developed by Galileo. The application of Newtonian mechanics demonstrates that this law is only a close approximation.
A water clock was utilized in the process of timekeeping. Galileo demonstrated that motion on an inclined plane had a constant acceleration, and that this acceleration was only dependent on the angle of the plane and not the mass of the rolling body. This demonstrated that the acceleration of free falling bodies is the same.
Galileo proposed that in the absence of air, all bodies, regardless of how much matter they contain, would fall at the same rate in relation to the earth. It appears that Aristotle considered all media to be viscous, and he argued that heavier bodies fall at a faster rate.
Learn more about Galileo’s experiment, here:
https://brainly.com/question/3920616
#SPJ2
Consider a bowl shapes like a cycloid. Show that the oscillation period of a marble released at any point in the bowl is always the same, irrespectively from how far the release point is from the bottom of the bowl. In particular prove that the oscillation period is:________.
All four of these pulleys are lifting the same amount of weight. Which one requires the least amount of force to lift it?
Answer: From the attached image, the pulley that requires least amount of force to lift the weight is pulley D.
Explanation:
A pulley is a circular disc made of steel or wood which can rotate freely about its axis, passing through its centre and perpendicular to its plane. The axel of the pulley is supported at its end by a framework called the block. There are three types of pulley system they include:
--> Fixed pulley: The load is connected to one end of a string passing over the pulley and the effort is applied at the other end.
-->Moveable pulley: The load is attached to a movable pulley with one end fixed to the string and hooked.
--> Compound pulley ( the block and tackle system): These are multiple pulley system in which extra fixed pulleys are added to the block fastened to the over head beam, and corresponding extra pulleys are added to the moveable block. The mechanical advantage is INCREASED due to increased number of pulleys. Each pulley is able to turn independently.
From the attached diagram, the pulley with the highest mechanical advantage is pulley D. This is so because the number of ropes supporting the moveable load is 4 (excluding the rope attached to the effort applied) is greater than the rest of other pulley in the options. This in turn DECREASES the amount of force necessary to lift the load.
Select the best answer for the question.
7. What does the term "single-pole" mean in a schematic?
A. The switch has only two positions: on or off.
B. The switch is always on.
C. The switch doesn't use a contact.
D. The switch has only one contact inside the switch.
Mark for review (Will be highlighted on the review page)
<< Previous Question
Next Gestion >>
Answer:
the correct answer is A
Explanation:
In an electrical circuit the switch can be of two types: unipolar and bipolar.
The bipolar switch refers to a three-contact switch that allows the polarity in the circuit to be reversed.
The unipolar switch has only two contacts so the polarity of the circuit is in one direction and the switch serves to interrupt the passage of electrons in the circuit.
Consequently the correct answer is A
A cyclist is coasting at 13 m/s when she starts down a 460 m long slope that is 30 m high. The cyclist and her bicycle have a combined mass of 70 kg. A steady 15 N drag force due to air resistance acts on her as she coasts all the way to the bottom. What is her speed at the bottom of the slope?
Answer:
The value is [tex]v = 23.6 \ m/s[/tex]
Explanation:
From the question we are told that
The velocity is [tex]u = 13 \ m/s[/tex]
The length of the slope is [tex]l = 460 \ m[/tex]
The height of the slope is [tex]h = 30 \ m[/tex]
The mass of the cyclist and her bicycle is [tex]m = 70 \ kg[/tex]
The drag force is [tex]F = 15 \ N[/tex]
Generally from the law of energy conservation we have that
[tex]PE + KE_t = W * KE_b[/tex]
Here [tex]PE[/tex] is the potential energy at the top of the slope which is mathematically represented as
[tex]PE = m* g * h[/tex]
=> [tex]PE = 70 * 9.8 * 30[/tex]
=> [tex]PE = 20580 \ J[/tex]
and [tex]KE_t[/tex] is the kinetic energy at the top of the slope which is mathematically represented as
[tex]KE_t = \frac{1}{2} * m * u^2[/tex]
=> [tex]KE_t = \frac{1}{2} * 70 * 13^2[/tex]
=> [tex]KE_t = 5915 \ J[/tex]
And W is the work done by the bicycle which is mathematically represented as
[tex]W = F * l[/tex]
=> [tex]W = 15 * 460[/tex]
=> [tex]W = 6900 \ J[/tex]
and [tex]KE_b[/tex] is the kinetic energy at the bottom of the slope which is mathematically represented as
[tex]KE_b = \frac{1}{2} * m * v^2[/tex]
=> [tex]KE_b = \frac{1}{2} * 70 * v^2[/tex]
=> [tex]KE_b = 35 v^2[/tex]
So
[tex]20580 + 5915 = 6900 + 35 v^2[/tex]
=> [tex]v = 23.6 \ m/s[/tex]
g calculate the effectiveness radiation dosage in sieverts for a 79 kg person who is exposed 6.8x10^9
Answer:
The answer is "[tex]\bold{dosage = 0.031 rem}[/tex]"
Explanation:
please find the complete question in the attached file.
Given value:
[tex]m = 79\ kg \\\\n = 3.4 \times 10^9 \\\\E = 5.5 \times 10^{-13} \\\\ RBE = 15[/tex]
[tex]\to E = n E\\[/tex]
[tex]= 3.4 \times 10^9 \times 5.5 \times 10^{-13} \\\\ = 1.87 \times 10^{-3}[/tex]
[tex]\to E(absorbed) = 1.87 \times 10^{-3} \times 0.87 = 1.63 \times 10^{-3}[/tex]
calculating the radiation absorbed per kg:
[tex]= \frac{1.63 \times 10^{-3}}{79} \\\\ = 2.06 \times 10^{-5} \\\\ = 0.00206 \ rad[/tex]
[tex]\to Dosage = 0.00206 \times 15 \\[/tex]
[tex]= 0.031 \ \ rem[/tex]
2. Which biome has many grasses and few trees due to fires, drought, and grazing?
(6 Points)
a. Temperate deciduous forest
b. Tropical rainforest.
c Temperate grasslands
d. Tundra
Answer:
C. Temperate grasslands
A cube slides down the surface of a ramp at a constant velocity. What is the magnitude of the
frictional force that acts on the cube due to the surface?
a. The weight of the cube
c. The component of weight of the cube perpendicular to the plane
b. The component of the normal reaction at the surface parallel to the plane
d. The component of weight of the cube parallel to the plane
Help! Don’t say the wrong answer please!!
Jamal is playing with magnetic toy vehicles. He has two identical magnetic vehicles (purple and green) on different sides of a center magnet that cannot move. His friend Simone challenges him to move one vehicle one space to the left or the right in order to get the largest increase in potential energy. That means Jamal can move the purple car to point A or point B, or he can move the green car to point C or point D.Explain which movement Jamal should make (which car and which point), and why that movement will result in the largest increase in potential energy. Describe the magnetic force that will act on the vehicle he moves.
Answer:
I think he should move the purple car to the right. good luck
An object A with a kinetic energy of 800 joules moving horizontally is subjected to a force of 100 Newtons, which is the opposite of motion as it moves from point X to point Y. XY distance is 2 m. What is the energy of A at point Y?
Answer:
d = 8 [m]
Explanation:
To solve this problem we must use the principle of conservation of energy, where the mechanical energy in a state plus the work done on the body, must be equal to the mechanical energy in the state Y. This can be easily represented in the following equation.
[tex]E_{x}+W_{x-y}=E_{y}[/tex]
where:
Ex = Mechanical energy in X [J]
Wx-y = Work among states x and y [J]
Ey = Mechanical energy in Y [J].
The key to being able to understand this problem is that in state X, we only have kinetic energy, while the energy in state Y is equal to zero (there is no movement). The work is equal to the product of force by distance, as work acts in the opposite direction to movement, this has a negative sign.
[tex]800 - F*d = 0\\100*d = 800\\d = 800/100\\d = 8 [m][/tex]
