Which best explains why we are able to accelerate forward when starting to run? A) The runner's upper body quickly leans forward
2 answers:
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Answer:
The emf, electric field and the current in the wire are 10 V, 3.57 V/m and 1.43 A.
Explanation:
Given that,
Resistance = 7 ohms
Length = 2.8 m
Time t =0.2
We need to calculate the change in magnetic flux
Using formula of induced emf
Put the value into the formula
We need to calculate the electric field in the wire
Using formula of electric field
We need to calculate the current in the wire,
Using formula of ohm's law
Put the value into the formula
Hence, The emf, electric field and the current in the wire are 10 V, 3.57 V/m and 1.43 A.
Answer:
v = 17.30 m / s
Explanation:
For this exercise we will use Newton's second law
at the bottom of the loop and stopped
∑ F = 0
N-W = 0
N = W
W = 770 N
the mass of the body is
W = mg
m = W / g
m = 770 / 9.8
m = 78.6 kg
on top of the loop and moving
∑ F = m a
N + W = m a
note that the three vectors go in the same vertical direction down
the centripetal acceleration is
a = v² / r
we substitute
N + W = m v² / r
v =
let's calculate
v =
v = 17.30 m / s