Social media presents some dangers that you should be aware of
2 answers:
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Answer:
110 kg
Explanation:
The momentum of the Malcom+motorcycle system is given by:
where
(m+M) is the total mass of the system, with
m = mass of Malcom
M = 190 kg (mass of the motorcycle)
v = 20 m/s velocity
Since we know the momentum:
p = 6000 kg m/s
We can re-arrange the equation to find the mass of Malcom:
Answer:
PART A: option b. .43nm
PART B: option d. 0.11nm
PART C: option c. The wavelengths of visible light are too long compared to the atomic spacing.
Explanation:
Given data
Wavelength λ = 0.20 nm
Angle θ = 0.8 rad
(a)
wavelength of x-ray to give maximum at the same location
λ₂ = m λ
Here, m = 2 is the interference fringe order.
Substitute the values in the above equation.
λ₂ = 2 × 0.2
= 0.4 nm
Hence, the wavelength of x-ray to give maximum at the same location is 0.4nm
(b)
The crystal plane separation is equal to d
The value of θ is equal to 0.8 rad.
Convert rad into degree as follows:
0.8 rad = = 144°/π = 45.86°
Solve for d, using equation (1) as follows:
2dsinθ = mλ
d = mλ / 2sinθ
d = (1) 0.17 / 2Sin45.86°
d = 0.17 / 1.9065
d = 0.089 nm
(c)
The visible light can not be used to study the structure of proteins because of the high wavelength of the visible light.
Answer:
b) √[(kx²/m) - 2gx]
Explanation:
The energy at the lowest point is equal to:
where:
Eelas = elastic energy [J]
k = spring constant [N/m]
x = extension of the spring [m]
We consider the lowest point, as the point where the potential energy is zero. At the moment when the person goes back through the point of the normal length of the elastic cord, it is this point that the person will have potential energy and kinetic energy.