Answer:
<h2>
<em><u>Joules</u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>Watts</u></em><em><u> </u></em><em><u>×</u></em><em><u> </u></em><em><u>Seconds</u></em></h2>
Explanation:
If you multiply the number of watts by the number of seconds, you'll end up with joules.
Answer:
φ = B sin (2π n/a x)
Explanation:
In quantum mechanics when a particle moves freely it implies that the potential is zero (V = 0), so its wave function is
φ = A cos kx + B sin kx
we must place the boundary conditions to determine the value of the constants A and B.
In our case we are told that the particle cannot be outside the boundary given by x = ± a / 2
therefore we must make the cosine part zero, for this the constant A = 0, the wave function remains
φ = B sin kx
the wave vector is
k = 2π /λ
now let's adjust the period, in the border fi = 0 therefore the sine function must be zero
φ (a /2) = 0
0 = A sin (2π/λ a/2)
therefore the sine argument is
2π /λ a/2 = n π
λ= a / n
we substitute
φ = B sin (2π n/a x)
Answer:
m₁ v = m₂ v
Explanation:
Let's define a system formed by the two objects, for this system the forces during the crash are internal, action and reaction, so that the memento is conserved,
Let's write the initial moment, before shock
p₀ = m₁ v + 0
Final after crash
= 0+ m₂ v
How the moment is preserved
p₀ =
m₁ v = m₂ v
It tells us that peer speed
m₁ = m₂
Since the two masses are the same, it shows that the moment is preserved in this collision.
The kinetic energy is
Initial
K₀ = ½ m₁ v² + 0
Final
= 0 + ½ m₂ v²
K₀ =
½ m₁ v² = ½ m₂ v²
m₁ = m₂
which is true because it indicates that the objects are the same.
I think its D answer
sorry I dont have explanation but I think its D
DC motors use a brush and commuter
