Answer:
3.03 m/s²
Explanation:
m₂ > m₁, so m₁ will move up, m₂ will move down, and m₃ will move to the right.
Sum of the forces on m₁:
∑F = ma
T₁ − m₁g = m₁a
T₁ = m₁g + m₁a
Sum of the forces on m₂:
∑F = ma
T₂ − m₂g = m₂(-a)
T₂ = m₂g − m₂a
Sum of the forces on m₃ in the y direction:
∑F = ma
N − m₃g = 0
N = m₃g
Sum of the forces on m₃ in the x direction:
∑F = ma
T₂ − T₁ − F = m₃a
T₂ − T₁ − Nμ = m₃a
Substituting and solving for acceleration:
(m₂g − m₂a) − (m₁g + m₁a) − (m₃g)μ = m₃a
m₂g − m₂a − m₁g − m₁a − m₃gμ = m₃a
g (m₂ − m₁ − m₃μ) = (m₁ + m₂ + m₃) a
a = g (m₂ − m₁ − m₃μ) / (m₁ + m₂ + m₃)
Given m₁ = 4 kg, m₂ = 12 kg, m₃ = 6 kg, and μ = 0.2:
a = 9.81 (12 − 4 − 6×0.2) / (4 + 12 + 6)
a = 3.03 m/s²
Answer:
Technician A is correct.
Explanation:
Stroke of the engine means how far is the piston moves during the cycle.It is determined by the crank of the crank shaft. Engine displacement volume is calculated by multiplying length of the stroke to the piston displacement area.
If there are more than one cylinder in the engine, than in that case this number in multiplied by the number of the cylinders inside the engine.
Therefore technician A is correct.
Answer:
Explanation:
Rydberg's formula is used to describe the wavelengths of the spectral lines of chemical elements similar to hydrogen, that is, with only one electron being affected by the effective nuclear charge. In this formula we can find the rydberg constant, knowing the wavelength emitted in the transcision between two energy states, we can have a value of the constant.
Where it is the wavelength of the light emitted, R is the Rydberg constant, Z is the atomic number of the element and are the states where .
In this case we have Z=1 for hydrogen, solving for R:
This value is quite close to the theoretical value of the constant
Diatomic molecules are only composed of 2 atoms so it would have to be MgCl2