Answer:
-0.1 Joules
Explanation:
Here, the kinetic energy of the spring and glider is conserved.
So, we get
KE of spring + Work done by friction = Change in momentum of glider
The work done by friction during that segment of motion is -0.1 Joules
Answer:
B blue
Explanation:
This is an exercise of photoelectric effect where electrons are removed from the metal by the incident radiation, the explanation of this phenomenon was given by Einstein, they assume that the light is formed by quanta and these collide with the electrons promoting their transfer; The equation that describes the process is
= h f - Φ
Whereis the kinetic energy, maximize the electrons started, h the plan constant, f the frequency and Φ the work function of the metal (link energy)
The radiation with the lowest energy that an electron can start
h f = Φ
Let's analyze the energy of the light rays with the wavelength
c = λ f
f = c / λ
λ red = 700 10⁻⁹ m
f = 3 108/700 10⁻⁹
f₁ = 4.29 10¹⁴ Hz
Yellow λ = 600 10⁻⁹ m
f₂ = 3 108/600 10⁻⁹
f₂ = 5 10¹⁴ Hz
λ blue = 450 10⁻⁹ m
f₃ = 6.67 10¹⁴ Hz
In the initial metal with a work function fi1 yellow light was needed, to start the electrons, when analyzing the initial equation if the work function increases Φ₂> Φ₁ more energy is needed to take out the electrons from the atom (E₂>E₁)
light of greater energy (frequency) than yellow is needed so that light is needed to go BLUE
You do the net force by subtracting the sides. The direction of the box is moving forward to the right by 10 N.
Answer:
B. Magnetic fields apply a force on any metal.
Explanation:
hope this helps u