Answer:

Explanation:
From the question we are told that:
Charge 
Velocity 
Angle 
Magnetic field 
Generally the equation for Force is mathematically given by


Therefore


Answer:
An electric motor is a device that changes electrical energy into mechanical energy. This change occurs due to the interaction between the magnetic field of magnets and the magnetic field due to the electric current in the loop. The interaction between the two produces a torque that makes the loop rotate on a shaft.
Answer:
10 million joules or 10,000 KJ
Explanation:
Work= Force x Displacement
convert 5km into meters -5km=5000m
W= 2000N x 5000m
w=10,000,000 Joules
or 10,000KJ
Answer:
The buoyant force on the piece of iron is 3.5 newtons.
Explanation:
According to the Archimedes' Principle, the piece of metal experiments a buoyant force equal to the weight of the displaced fluid. By Newton's Laws, we have the following formula:
(1)
Where:
- Buoyant force on the piece of iron, in newtons.
- Weight of the piece of metal, in newtons.
- Weight of the fluid displaced by the piece of metal, in newtons.

If we know that
and
, then the buoyant force on the piece of iron is:


The buoyant force on the piece of iron is 3.5 newtons.