Which object would be the best insulator of electricity?
2 answers:
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The boulder has a weight of W=2400 N. The weight of an object is the product between its mass m and the gravitational acceleration g:
Rearranging the relationship, we can calculate the mass of the boulder:
We are told that Superman applies a horizontal force to this object, and as a result, the acceleration of the boulder is
. We can find the force applied by using Netwon's second law of motion:
Rearranging the relationship, we can calculate the mass of the boulder:
We are told that Superman applies a horizontal force to this object, and as a result, the acceleration of the boulder is
Answer:
Explanation:
Given that:
A circuit with a lagging 0.7 pf delivers 1500 watts and 2100VA
Here:
the initial power factor i.e cos θ₁ = 0.7 lag
θ₁ = cos⁻¹ (0.7)
θ₁ = 45.573°
Active power P = 1500 watts
Apparent power S = 2100 VA
What amount of vars must be added to bring the pf to 0.85
i.e the required power factor here is cos θ₂ = 0.85 lag
θ₂ = cos⁻¹ (0.85)
θ₂ = 31.788°
However; the initial reactive power = P×tanθ₁
the initial reactive power = 1500 × tan(45.573)
the initial reactive power = 1500 × 1.0202
the initial reactive power = 1530.3 vars
The amount of vars that must therefore be added to bring the pf to 0.85
can be calculated as: