Answer:
Coal and oil are mined causing to destroy ecosystems.
Explanation:
it doesn't make sense
Answer:
The force is
Explanation:
Given that,
A long, straight wire carries a current.
Suppose, a long, straight wire carries a current 0.86 A. An electron is traveling in the vicinity of the wire. At the instant when the electron is 4.50 cm from the wire and traveling at speed of directly toward the wire. What are the magnitude of the force that the magnetic field of the current exerts on the electron?
We need to calculate the magnetic field
Using formula of magnetic field
Where, I = current
r = distance
Put the value into the formula
We need to calculate the force
Using formula of force
Here,
Where, q = charge of electron
v = velocity of electron
B = magnetic field
Put the value into the formula
Hence, The force is
Answer:
N = 731 N
Explanation:
From the question, we recall the following
The mass m = 250 kg
The initial kinetic energy T₁ = 0
The initial kinetic energy T₂ = 1/2 mv²
velocity = v at B
thus,
The work is carried out because of the weight
so,
U₁→₂ = W * h
= (250 * 9.81) * (27 m - 27 cos 40 m)
which is =15491.95 N.m
From the energy principle - from work
T₁ + U₁→₂ = T₂
We can say,
0 + 15491.95 N.m = 1/2 * 250 kg * v²
v = 11.13 m/s
Now we solve for the normal acceleration
aₙ = v²ρ = (11.13 m/s)²/27 m
aₙ = 4.588 m/s²
Now, by applying the second law
∑Fy = -maₙ
or we say that, N - W cos 40° = -maₙ
so,
N = 250 * 9.81 N cos 40° - 250 kg * 4.588 m/s²
Therefore N = 731 N