Answer: 3A
Explanation:
First, we must calculate voltage by summing the reciprocal of the resistances in the circuit
1/40 +1/40 = 2/40 = 1/20 = 1/R, so R = 20Ω
Using Ohm's Law, I = V/R, so the current I is I = 120/20 = 6A
Using Kerchoff's Circuit Law, we know that current will split evenly at a junction, so each resistor will get one half, or 3A.
D. Only B and C
Medium and High levels can be harmful. But low even levels aren't good either.
The classical physics works on the Newton's laws of motion. It is applicable on heavenly bodies which are governed by the gravitational force. On the other hand, Quantum Physics is applicable for very low mass and sized bodies like electron, protons etc. The classical physics would accurately describe the motion of satellite moving with speed 7500 m/s using the following formula:

where G is the gravitational constant, M is the mass of the planet and v is the orbital speed. Then radius of the orbit can be described by this formula.
Answer:

Explanation:
First of all, let's calculate the energy of a single photon of wavelength

which is given by

The power of the flash is

and the time it lasts is

so the total energy delivered in one flash is

This energy contains exactly N photons each of energy
, so the number of photons emitted in one flash is

Answer:
C
Explanation:
Angular momentum is the product of moment of inertia and angular velocity.
L = I × ω
Since the planet follows a stable circular orbit, I and ω are constant and non-zero. Therefore, the angular momentum is constant and non-zero.