The current flowing through a lamp is 1.5 A. It is plugged into a 120-V outlet. What is the resistance of the lamp
2 answers:
Explanation:
According to ohm's law, current flowing through a conductor is directly proportional to the voltage over resistance.
Mathematically, I =
where, I = current
V = voltage
R = resistance
It is given that value of voltage is 120 V and current is 1.5 ampere. Therefore, calculate the resistance as follows.
I =
or, R =
=
= 80 volts per ampere
= 80 ohms
Hence, resistance of the lamp is 80 ohms.
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Answer:
a.
b.
Explanation:
I have attached an illustration of a solid disk with the respective forces applied, as stated in this question.
Forces applied to the solid disk include:
Other parameters given include:
Mass of solid disk,
and radius of solid disk,
a.) The formula for determining torque (), is
Hence the net torque produced by the two forces is given as a summation of both forces:
b.) The angular acceleration of the disk can be found thus:
using the formula for the Moment of Inertia of a solid disk;
where = Mass of solid disk
and = radius of solid disk
We then relate the torque and angular acceleration () with the formula:
