Answer:
(6.675 × 10⁶) m
Explanation:
A body vibrating in simple harmonic motion has its frequency related to the spring constant and mass of the body through the relation
f = (1/2π) √(k/m)
k = 2233 N/m
m = mass of one molecule of Nitrogen = 28.0 g = 0.028 kg
f = (1/2π) √(2233/0.028)
f = 44.945 Hz
And the photons that'll excite the molecule to the next state must at least have this frequency (f = 44.945 Hz)
For waves, the velocity (v), frequency (f) and wavelength (λ) are related through the relation
v = fλ
v = speed of light (since it's a photon) = (3 × 10⁸) m/s
λ = (v/f) = (3 × 10⁸)/44.945 = 6674824.8 m = (6.675 × 10⁶) m = (6.68 E6) m
Answer: Radioactive dating
Explanation: I took the test, and use the other answer, and got it wrong. The test told me that this is the correct one.
Answer:
W = 1,049 10⁹ J
Explanation:
Work is defined by the relation
W = F. d = F d cos θ
where tea is the angle between the forces and the displacement.
The total work is the sum of the work of each tug.
Tug 1
W₁ = F d cos θ₁
the angle measured from the positive side of the x-axis is
θ₁ = 14 + 90 = 104º
tugboat 2
W₂ = F d cos θ₂
θ₂ = 14
we substitute
W = F d cos θ₁ + F d cos θ₂
W = F d (cos θ₁ + cos θ₂)
let's calculate
W = 1.80 10⁶ 800 (cos 104 + cos 14)
W = 1,049 10⁹ J
Answer:
Technician A is correct
Explanation:
The power stroke starts after the compression stroke, the piston is at Top Dead Center, and the valves are closed. At the beggining of it, the mixture is ignited (spark in Otto engines, by the pressure in Diesel Engines) so, technician A is correct. At the end of power stroke, the exhaust stroke starts. In this stroke, the EXHAUST valve is open, to let the gases flow out of the cylinder as the piston goes from the Bottom Dead Center to the Top Dead Center. Therefore Technician B is incorrect.
Answer:
Explanation:
A lot of physicist and many cosmologist believe by their research works on quantum fluctuation that it is possible for the universe to be created out of nothing. They believe and has almost proved that particle comes in and out of existence from empty space. This idea led them believe that big bang singularity also came out of nothing (hyperspace) by quantum fluctuation creating positive and negative energy of equal amount. Thus conserving law of energy. In this scenario, positive energy is matter and negative energy is gravity so total energy of universe/big bang singularity is zero. Therefore, it is plausible for our universe to come out of nothing on its own. But why universe came into existence it's own confirming the idea of 'why there is something rather than nothing' as Lawrence Maxwell Krauss hypothesized could be correct.