Answer:
The work done by the frictional force is 600J.
Explanation:
The work done by the frictional force is
.
Now, and
; therefore,
Hence, the work done by friction is 660J.
A motorcycle is moving at a constant speed of 40 km/h. How long does it take the motorcycle to travel a distance of 10 km
1 answer:
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Answer:
The magnitude of the force, B = 5 Tesla, Up (North) direction
Explanation:
Magnetic force F= Eq where Electric field, E = 750 NC
and charge, q = -70 μC = -7 ×C
F = 750 × -7 ×
F = 0.0525
But F = qvB; B =
where B is the magnetic field
= 0.0525 ÷ ( -7 × × 30)
B = 5.0 Teslas
The force on a negative charge is in exactly the opposite direction to that on a positive charge.
Hence the direction of the charge is up (North).