Which of the following underlined items is not an intensive property? The melting point of aluminum metal is 933 K. A chemical r
1 answer:
You might be interested in
The energy of a photon is given by:
where h is the Planck constant and f is the photon frequency.
We know the energy of the photon,
, so we can rearrange the equation to calculate the frequency of the photon:
And now we can use the following relationship between frequency f, wavelength
and speed of light c to find the wavelength of the photon:
where h is the Planck constant and f is the photon frequency.
We know the energy of the photon,
And now we can use the following relationship between frequency f, wavelength
Answer:
Explanation:
We define the linear density of charge as:
Where L is the rod's length, in this case the semicircle's length L = πr
The potential created at the center by an differential element of charge is:
where k is the coulomb's constant
r is the distance from dq to center of the circle
Thus.
Potential at the center of the semicircle
Answer:
(A) 108 N
(B) 560 N
Explanation:
From the law of solid friction, for a body in contact with a flat surface,
<em>F</em> is the maximum frictional force between the body and surface, <em>μ</em> is the coefficient of friction and <em>R</em> is the reaction between the body and the surface.
The maximum frictional force is the maximum weight of the rod the man can hold without slipping.
(A) His hands are dry. Then <em>μ</em> = 0.27.
<em>R</em> is the reaction of the rod against his hands. Because he presses on the rod perpendicular to the surface of the vertical rod, the reaction is the same as his grip force.
<em>R</em> = 400 N
Then, <em>F</em> = 0.27 × 400 N = 108 N
(A) His hands are wet. Then <em>μ</em> = 1.4.
<em>R</em> = 400 N
Then, <em>F</em> = 1.4 × 400 N = 560 N