Your friend wants to be magician and intends to use Earth’s magnetic field to suspend a current-carrying wire above the stage. H
1 answer:
Answer:
Explanation:
Under this condition, . In order to suspend the wire, this magnetic force would have to be equal in magnitude to the gravitational force exerted by Earth on the wire the maximum force at angle
F=ILxB
Now to the suspend the wire so use the maximum force and solve to the current knowing the magnetic field of the earth
∑Fy=0
Solve to I current
I suggest do an toher act is really risk that current for an act
You might be interested in
(a) the initial kinetic energy of the projectile is equal to:
The projectile is fired straight up, so at the top of its trajectory, its velocity is zero; this means that it has no kinetic energy left, so for the law of conservation of energy, all its energy has converted into potential energy, which is equal to
b) If the projectile is fired with an angle of
, its velocity has 2 components, one in the x-direction and one in the y-direction:
This means that at the top of its trajectory, only the vertical velocity will be zero (because the horizontal velocity is constant, since the motion on the x-axis is a uniform motion). Therefore, at the top of the trajectory, the projectile will have some kinetic energy left:
For the conservation of energy, the initial energy mechanical energy must be equal to the mechanical energy at the highest point:
the initial kinetic energy is the same as point a), so we can re-arrange this equation to find the new potential energy at the top of the trajectory:
The projectile is fired straight up, so at the top of its trajectory, its velocity is zero; this means that it has no kinetic energy left, so for the law of conservation of energy, all its energy has converted into potential energy, which is equal to
b) If the projectile is fired with an angle of
This means that at the top of its trajectory, only the vertical velocity will be zero (because the horizontal velocity is constant, since the motion on the x-axis is a uniform motion). Therefore, at the top of the trajectory, the projectile will have some kinetic energy left:
For the conservation of energy, the initial energy mechanical energy must be equal to the mechanical energy at the highest point:
the initial kinetic energy is the same as point a), so we can re-arrange this equation to find the new potential energy at the top of the trajectory:
Answer:
Coefficient of static friction ,μs = 0.15
Coefficient of kinetic friction ,μk = 0.089
Explanation:
Given that
m = 1.7 kg
Static friction :
The force required to start the motion F= 2.6 N
We know that when book is in rest condition then static friction force act on it.
We know that the maximum value of the static friction force
fr = μ m g
At limiting condition
F= fr
2.6 = μ m g
2.6 = μ x 1.7 x 9.81
μ = 0.15
Kinetic friction :
F= 1.5 N
When the book is in moving condition then kinetic friction force act on it.
We know that the maximum value of the kinetic friction force
fr = μ m g
F= fr
= μ m g
1.5 = μ x 1.7 x 9.81
μ = 0.089
Coefficient of static friction ,μs = 0.15
Coefficient of kinetic friction ,μk = 0.089
Answer:
208.33 W
141.26626 seconds
Explanation:
E = Energy =
t = Time taken = 8 h
m = Mass = 2000 kg
g = Acceleration due to gravity = 9.81 m/s²
h = Height of platform = 1.5 m
Power is obtained when we divide energy by time
The average useful power output of the person is 208.33 W
The energy in the next part would be the potential energy
The time taken would be
The time taken to lift the load is 141.26626 seconds