Photograph E shows a rechargeable torch. When a student shakes the torch, the magnet moves through the coil and back again. This
induces a voltage across the ends of the coil. The voltage is used to provide current to recharge the battery. (a) Explain why a voltage is induced (b) State one way to increase this voltage
2 answers:
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Answer:
w = 0.189 rad/ s
Explanation:
This exercise we work with the conservation of the moment, the system is made up of the merry-go-round and the child, for which we write the moment of two instants
Initial
L₀ = I₀ w₀
Final
= I w
L₀ = L_{f}
I₀ w₀ = I_{f} w
.w = I₀/I_{f} w₀
The initial moment of inertia is
I₀ = 500 kg. m2
The final moment of inertia
= 500 + m r²
I_{f} = 500 + 20 1.5
I_{f} = 530 kg m²
Initial angular velocity
w₀ = 0.20 rad / s
Let's calculate
w = 500/530 0.20
w = 0.189 rad / s
Answer:
Velocity of Sedan = 21 m/s
Velocity of SUV = 12 m/s
Explanation:
As we know that deceleration due to friction force is given as
so we have
now the two cars comes to rest at a point which is at position of 5.39 m West and 6.43 m South
so net displacement of the car is given as
now the velocity of the two cars just after the impact is given as
direction of the motion is given as
South of West
now we can use momentum conservation as there is no external force on it
Momentum conservation in North to south direction
Similarly momentum conservation towards West direction