A 20.0 kg rock is sliding on a rough , horizontal surface at8.00 m/s and eventually stops due to friction .The coefficient ofkin
etic fricction between the rock and the surface is 0.20
what average thermal power is produced as the rock stops?
what average thermal power is produced as the rock stops?
2 answers:
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Answer:
First Question
Second Question
The wavelength is for an X-ray
Explanation:
From the question we are told that
The width of the wall is
The first excited state is
The ground state is
Gnerally the energy (in MeV) of the photon emitted when the proton undergoes a transition is mathematically represented as
Here h is the Planck's constant with value
m is the mass of proton with value
So
=>
Generally the energy of the photon emitted is also mathematically represented as
=>
=>
=>
Generally the range of wavelength of X-ray is
So this wavelength is for an X-ray.
Answer:
vB' = 0.075[m/s]
Explanation:
We can solve this problem using the principle of linear momentum conservation, which tells us that momentum is preserved before and after the collision.
Now we have to come up with an equation that involves both bodies, before and after the collision. To the left of the equal sign are taken the bodies before the collision and to the right after the collision.
where:
mA = 0.355 [kg]
vA = 0.095 [m/s] before the collision
mB = 0.710 [kg]
vB = 0.045 [m/s] before the collision
vA' = 0.035 [m/s] after the collision
vB' [m/s] after the collison.
The signs in the equation remain positive since before and after the collision, both bodies continue to move in the same direction.