Answer:
Explanation:
The enegy of a single photon is given by:
where
h is the Planck costant
c is the speed of light
is the wavelength of the photon
In this problem,
so the energy of one photon is
1 mole of photons contains a number of Avogadro of photons:
therefore, the total energy of 1 mole of these photons will be
Answer:
(a). The width of the river is 90.5 m.
The current speed of the river is 3.96 m.
(b). The shortest time is 15.0 sec and we would end 59.4 m east of our starting point.
Explanation:
Given that,
Constant speed = 6.00 m/s
Time = 20.1 sec
Speed = 9.00 m/s
Time = 11.2 sec
We need to write a equation for to travel due north across the river,
Using equation for north
Put the value in the equation
....(I)
We need to write a equation for to travel due south across the river,
Using equation for south
Put the value in the equation
....(II)
(a). We need to calculate the wide of the river
Using equation (I) and (II)
We need to calculate the current speed
Using equation (I)
(b). We need to calculate the shortest time
Using formula of time
We need to calculate the distance
Using formula of distance
Hence, (a). The width of the river is 90.5 m.
The current speed of the river is 3.96 m.
(b). The shortest time is 15.0 sec and we would end 59.4 m east of our starting point.
The particle has an acceleration vector with one component directed toward the center of its orbit, and the other directing tangentially to its orbit. Call these components (
for center) and
(
for tangent). Then its acceleration vector has magnitude
We have
where is the particle's speed and
is the radius of orbit, so
We're given that the particle's speed changes at a rate of 23.1 m/s^2. Its velocity vector points in the same direction as , i.e. perpendicular to
, so
Then the magnitude of the particle's acceleration is
