Explanation:
It is known that wave intensity is the power to area ratio.
Mathematically, I =
As it is given that power is 28.0 W and area is .
Therefore, sound intensity will be calculated as follows.
I =
=
=
or, =
Thus, we can conclude that sound intensity at the position of the microphone is .
The answer is struggling to perform
Answer:
El coeficiente de fricción entre el bloque y el piso es 0,64.
Explanation:
Podemos hallar el coeficiente de fricción usando la definición de trabajo:
En donde:
Kf es la energía cinética final =0
Ki es la energía cinética inicial
m: es la masa = 2 kg
v: es la velocidad = 5 m/s
Además el trabajo es el producto de la fuerza de rozamiento (Fr) por el desplazamiento (d), por lo que tenemos:
Por lo tanto, el coeficiente de fricción entre el bloque y el piso es 0,64.
Espero que te sea de utilidad!
Answer: A)
Explanation: when an electron is placed in a magnetic field, it experiences a force.
This force is given below as
F=qvB*sinθ
F = force experienced by charge.
q = magnitude of electronic charge
v = speed of electron
B= strength of magnetic field
θ = angle between magnetic field and velocity.
What defines the force exerted on the charge is the angle between the field and it velocity.
If magnetic field is parallel to velocity, then it means that θ=0° which means sin 0 = 0, which means
F = qvB * 0 = 0.
The charge being at rest has nothing to do with the angle between magnetic field strength and velocity.
Their speeds will be equal. The one with more mass will have more kinetic energy.