Answer:
+0.231 m/s
Explanation:
The problem can be solved by using the law of conservation of momentum. In fact, we have that the total momentum before the collision must be equal to the total momentum after the collision:
where we have
m1 = 245000 kg is the mass of the first car
m2 = 57500 kg is the mass of the second car
u1 = 0.513 m/s is the initial velocity of the first car
u2 = -0.125 m/s is the initial velocity of the second car
v = ? is the final velocity of the two cars together, after the collision
Solving the equation for v, we find
And the direction (positive sign) is the same as the initial direction of the first car.
Answer:
= 1.47 eV
Explanation:
This is an exercise that we can solve using the photoelectric effect, which stable that photons can be treated as particles and collide with the material, the process is described by the expression
+ Φ = h f
Where Kmanx is the maximum energy of the torn electrons, Φ is the work function of the material and hf is the energy of the photons
With the initial data we calculate the job function
We use the relationship of wave velocity with wavelength and frequency
c = λ f
f = c / λ
f = 3 10⁸/400 10⁻⁹
f = 7.5 10¹⁴ Hz
Let's reduce the magnitude to the SI system
= 1.10 eV (1.6 10⁻¹⁹ J / 1 ev = 0.6875 10⁻¹⁹ J
Φ = h f -
Φ = 6.63 10⁻³⁴ 7.5 10¹⁴ - 0.6875 10⁻¹⁹
Φ = 4.9725 10⁻¹⁹ - 0.6875 10⁻¹⁹
Φ = 4.275 10⁻¹⁹ J
Now let's calculate the frequency of the other wavelength
f = c / λ₂
f = 3 10⁸/300 10⁻⁹
f = 1 10¹⁵ Hz
We calculate
= hf - Φ
= 6.63 10⁻³⁴ 1 10¹⁵ - 4.275 10⁻¹⁹
= 6.63 10⁻¹⁹ - 4,275 10⁻¹⁹
= 2,355 10⁻¹⁹ J
= 2,355 10⁻¹⁹ j (1 eV / 1.6 10⁻¹⁹ j)
= 1.47 eV
Precipitation in a cold front typically occurs around the outer edges of the cooler air mass. This is where the cool air meets the previously warm air.
Also, it can be said to happen at the front of the front and behind the front.
Bohrs atomic model only explains the atomic structure in which electrons travel around the nucleus in well-defined orbits determined by quantum conditions. A transition from a higher orbit to a lower orbit will release quantized energies of light, which would explain the light spectrum emitted by an element.