As I understand, a "wave" means "electromagnetic wave," or "light." These waves may reflect from a mirror (other waves also may reflect, for example, waves on a water surface may reflect from a wall).
The main law of reflection is that an angle of reflection is the same as an angle of incidence. They are both measured from the normal at the point of incidence (normal is a straight line perpendicular to a mirror...
Electric potential on one side of the closed circuit is applied and this causes the electrons to move to a position of lower potential. Imagine this as when you raise an object above the ground and release it. It moves from its higher potential energy position above the ground to its lower potential energy position.
Dynamic equilibrium is a state in which the net external force and torque on a system moving with constant velocity is zero.
A force of 20 N is applied to a block.
The magnitude and direction of the frictional force is:
B ) 20 Newtons opposite the direction of the applied force.
Answer:
0.273 MHz
Explanation:
The frequency f₁ of the reflected waves to the stationary detector is given by
f₁ = f(v + v₁)/(v - v₂) where f = frequency of sound waves = 0.225 MHz, v = speed of sound in air = 343 m/s, v₁ = speed of detector = speed of truck = 33.0 m/s and v₂= speed of source of reflected wave = speed of truck = 33.0 m/s
f₁ = f(v + v₁)/(v - v₂)
= 0.225MHz(343 m/s + 33 m/s)/(343 m/s - 33 m/s)
= 0.225MHz × 376/310
= 0.273 MHz