Answer:
105.1N
Explanation:
According to the newton second law
Since the acceleration is zero, then;
Since;
Given the following
mass of ladder m = 14kg
acceleration due to gravity g = 9.8m/s²
θ = 50°
Substitute
Hence the magnitude of the friction force (in N) exerted on the ladder in the point of contact with the horizontal surface is 105.1N
Answer:
The uncertainty in the position of the electron is
Explanation:
The Heisenberg uncertainty principle is defined as:
≥
(1)
Where is the uncertainty in momentum,
is the uncertainty in position and h is the Planck's constant.
The momentum is defined as:
(2)
Therefore, equation 2 can be replaced in equation 1
≥
Since, the mass of the electron is constant, v will be the one with an associated uncertainty.
≥
(3)
Then, can be isolated from equation 3
≥
(4)
But
Hence, the uncertainty in the position of the electron is