A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of the field is changing, so that an emf of 0.43 V and a current of 3.1 A are induced in the coil. The wire is then re-formed into a single-turn square coil, which is used in the same magnetic field (again perpendicular to the plane of the coil and with a magnitude changing at the same rate). What (a) emf and (b) current are induced in the square coil
Answers
Answer:
2.62A
Explanation:
Given
V = 0.43 V
I = 3.1 A
Then, V = IR, R = V/I
R = 0.43/3.1
R = 0.14 Ω
The induced emf = dB/dt * A
So that, dB/dt = emf/A
Since dB/dt is constant then Emf/A(circle) = Emf/A square
So Emf (square)/Emf (circle) = A square / A circle
A circle = πr². The perimeter of the square is 2πr which also is the circumference of the square.
Since the perimeter is 2πr, then each side would be πr/2. Thus, the area of the square would be, (πr/2)² = π²r²/4
So A square/Acircle = (π²r²/4) / πr² = π/4 = 0.79
this means that, emf square = emf circle * 0.79
emf square = 0.43*0.79 = 0.34V
I = V/R
I = 0.34/0.13
I = 2.62A
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A person wants to shoot an arrow at a bird which is 200 m directly above her. if the arrow leaves the bow at 60 m/s will the arrow reach the bird
Answers
when you toss it.
You give the ball kinetic energy. As it goes up, the kinetic energy
changes to potential energy, and on the way down, that potential
energy changes back into kinetic energy.
If there's nothing along the way to steal any energy from the ball,
then its TOTAL energy (kinetic PLUS potential) is constant all the
way up and down.
But in this question, there IS something else in the picture, and it
steals energy from the ball. Air resistance is partly the friction of
the air molecules scraping against the ball, and partly the work
that the ball has to do in order to push air out of the way so that
it can get through. All of that steals energy whenever the ball is
moving.
So figure it out: If you give it some energy when you throw it,
and it can never have any more than that because it doesn't
have little jet engines on it, and the air is constantly robbing
some of the energy whenever the ball is moving, then the most
it can ever have is just as it leaves your hand.
Answers
I hope this helps :)
Answers
Explanation:
Potential Energy = mg h mg = 240 N
80 = 240 h
h = 80 / 240 = 1/3 meter ( 33.3 cm)
Answers
Answer:
vB = 15.4 m/s
Explanation:
Principle of conservation of energy:
Because there is no friction the mechanical energy is conserve
ΔE = 0
ΔE : mechanical energy change (J)
K : Kinetic energy (J)
U: Potential energy (J)
K = (1/2)mv²
U = m*g*h
Where :
m: mass (kg)
v : speed (m/s)
h : hight (m)
Ef - Ei = 0
(K+U)final - (K+U)initial =0
(K+U)final = (K+U)initial
((1/2)mv²+m*g*h)final = ((1/2)mv²+m*g*h)initial , We divided by m both sides of the equation:
((1/2)vB² + g*hB = (1/2 )vA²+ g*hA
(1/2) (vB)² + (9.8)*(14.7) = 0 + (9.8)(26.8 )
(1/2) (vB)² = (9.8)(26.8 ) - (9.8)*(14.7)
(vB)² = (2)(9.8)(26.8 - 14.7)
(vB)² = 237.16
vB = 15.4 m/s : speed of the cart at B
Answer:
the guy above me is correct
Explanation:
Machines consume energy until no energy remains.
Energy transferred to a machine equals energy transferred from it.
Engineers break the law of conservation of energy by using ma
Answers
In short, Your Answer would be Option C
Hope this helps!
Answer:
Energy transferred to a machine equals energy transferred from it. It is because according to conservation of energy we can't create or destroy energy so, energy remains constant however, their form can be change by machine's
Hope this helps!
Explanation:
In short, Your Answer would be Option C
Answers
Answer:
The Supreme Court decision in Marbury v. Madison established the principle of judicial review. This means that the Supreme Court has the power to declare laws or actions of the executive and legislative branches unconstitutional if they violate the Constitution. The decision was made in 1803 and is considered a landmark case in American law and politics. It established the idea that the judiciary is a coequal branch of government and has the responsibility to interpret the Constitution and ensure that the other branches of government do not exceed their constitutional authority.
Explanation: