Insulators are the poorest conductor of energy
Answer:
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Answer:
7.
1.wrapping the coil around a piece of iron (such as an iron nail)
2.adding more turns to the coil.
3.increasing the current flowing through the coil.
6.What makes an electromagnet stronger than a solenoid? There is a ferromagntic material inside the solenoid that is magnetized and adds to the strength of the magnetic field produced by the current alone. ... Wind the coils of the solenoid closer together.
Answer:
D. 4 m
Explanation:
According to the work-energy theorem, the work done by the force acting on a body modifies its kinetic energy.
The car comes to rest after a given distance, so 
. Recall the definition of work 
, here F is the constant force acting on the car, d is its traveled distance and 
is the angle between the force and the displacement, since friction force acts opposite to the direction of motion 
:
We have:
Thus:
Explanation:
(a) You can solve this using kinematics or energy.
Using kinematics:
a = F/m = 90 N / 4 kg = 22.5 m/s²
v₀ = 0 m/s
Δx = 5 m
Find: v
v² = v₀² + 2aΔx
v² = (0 m/s)² + 2 (22.5 m/s²) (5 m)
v = 15 m/s
Using energy:
W = ΔKE
Fd = ½ mv²
(90 N) (5 m) = ½ (4 kg) v²
v = 15 m/s
(b) ΔU = mg Δh
ΔU = (4 kg) (9.8 m/s) (12 m sin 40° − 15 m)
ΔU = -290 J
W = ΔU = -290 J
