There are two ways to find energy. Energy=F*d=mv^2. We can use this relationship to find v:
Answer:
τ = 15N.m
Explanation:
Torque on the rod is given by:
If you were told that gravity contributes as well, and you were given the mass of the rod, you would have to subtract the torque of the weight to this value.
Answer:
The infrared photon does not have greater energy as compare to visible rays so infrared rays pass through but due to greater energy than the gap visible rays could not hence silicon is transparent to infrared rays but silicon is opaque to visible rays .
Answer:
what was the answer
Explanation:
im taking the quiz and could use some help
Given that,
Magnetic field strength is
B = 1.8T
The wedding ring has a diameter of
d = 2.23 cm = 0.023m
Time take t = 0.32 secs
A. Current induced
From ohms law
V= iR, given that R = 0.01Ω
So, we need to get the induced emf
Using
ε = -NdΦ / dt
Where Φ = BA
ε = -A ∆B / ∆t
ε = -¼πd²(B2-B1) / (t2-t1)
ε = -¼ × π × 0.023² × -1.8 / 0.32
ε = 0.0023371 V
Then
I = ε / R
I = 0.002337 / 0.01
I =0.2337 A
B. Power discippated?
Power is given as
P = iV
P = 0.2337 × 0.002337
P = 0.0005462 W
P = 0.56 mW
C. The magnetic field at the centre of the ring.
The electric field at the centre of the ring is zero because each part of the ring will cause a symmetrical opposite magnitude at every point,
Then, B = 0 T