Voltage of each component is same.
Answer:
then he sat down and chilled right?
Explanation:
Answer:
4.15 m/s
Explanation:
As the total energy must be conserved (neglecting air resistance) the change in gravitational potential energy, must be equal to the change in kinetic energy:
ΔE = ΔK + ΔU =0
If we take as a zero reference level for the gravitational potential energy, the height of the swing seat above the ground, (which is equal to 0.21 m), we can find the initial gravitational energy, considering the height of the point where the seat is released, regarding this point:
h₀ = 1.09 m -0.21 m = 0.88 m
⇒ U₀ = m*g*h₀ = 400 N*0.88 m = 352 J
As Uf = 0, ΔU = Uf -U₀ = -352 J
As the swing starts from rest, K₀=0, so we can say:
ΔK = Kf = (1)
As ΔK = -ΔU ⇒ ΔK = 352 J (2)
From (1) and (2) we can solve for vf, as follows:
So, when the swing passes through its lowest position, Betty moves at 4.15 m/s.
Answer:
The statements that apply are:
- It is possible to induce a current in a closed loop of wire by change the orientation of a magnetic field enclosed by the wire.
- It is possible to induce a current in a closed loop of wire by changing the strength of a magnetic field enclosed by the wire.
- It is possible to induce a current in a closed loop of wire without the aid of a power supply or battery.
- It is possible to induce a current in a closed loop of wire located in a uniform magnetic field by either increasing or decreasing the area enclosed by the loop.
Explanation:
Faraday's law says that the induced emf is equal to
where N is the number of turns, and is the magnetic flux through the loop:
;
therefore,
which means emf will be induced in a coil whenever the magnetic field , the area , or the angle is changed. Given this, let us look at each of the statements one by one:
(1). It is possible to induce a current in a closed loop of wire by changing the orientation of a magnetic field enclosed by the wire. ( Yes. This changes )
(2). It is possible to induce a current in a closed loop of wire by changing the strength of a magnetic field enclosed by the wire. ( Yes. This changes )
(3). It is possible to induce a current in a closed loop of wire without the aid of a power supply or battery. (Yes, a changing magnetic field can also do the job)
(4). It is possible to induce a current in a closed loop of wire located in a uniform magnetic field without rotating the loop and without changing the loop shape. (Nope. This does not change or .)
(5). It is possible to induce a current in a closed loop of wire located in a uniform magnetic field by either increasing or decreasing the area enclosed by the loop. (Yep. This changes )
Thus, the statements that apply are (1), (2), (3), and (5).