A piece of wood that floats on water has a mass of 0.0175 kg. A lead weight is tied to the wood, and the apparent mass with the
1 answer:
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A)
The magnetic field at the center of a coil of N turns is given by
where
I is the current in the coil
N is the number of turns
R is the radius of the coil
Here we have
I = 6.5 A is the current in the coil
N = 100 is the number of turns
is the radius of the coil
Substituting,
B) The force points north
The direction of the force on a positive ion in water can be found by using the right-hand rule. In fact, we have:
- Index finger: direction of motion of the ion --> towards east
- Middle finger: direction of magnetic field --> downward
- Thumb: direction of the force --> towards north
So, the force points north.
C)
The magnitude of the magnetic force on a charged particle moving perpendicularly to the field is
where
q is the charge of the particle
v is the velocity
B is the magnitude of the magnetic field
In this case, we have
is the charge
is the velocity
is the magnetic field strength
Substituting,
Answer:
The force does the ceiling exert on the hook is 269.59 N
Explanation:
Applying the second Newton law:
F = m*a
From the attached diagram, the net force in object 1 is:
In object 2:
Adding the two equations:
(eq. 1)
The torque:
Where
I = moment of inertia
α = angular acceleration
If the linear acceleration is
Torque due the tension is equal:
Substituting torque, mass, in equation 1, the expression respect the acceleration is:
Where
W₁ = 75 N
W₂ = 125 N
W = 80 N
The net force is:
