Photon has no rest mass but when photon travels at the speed of light, it gains momentum.
The energy of the photon is E= pc, c = speed of the photon and p= its momentum.
∴ E = pc
but p = h/λ (This comes from De-broglie's theory)
∴ E = hc/λ
frequency = ν = c/λ
∴E = hν
Answer: Respective answers are 1.27 m/s^2 and 90.17 N
Explanation:
Explanation requires basic knowledge of forces in physics. The solutions are attached in this response. To summarize:
- Newton's Second Law -> F = ma
- Force of friction = Fn (normal force) x µk (coefficient of kinetic friction)
- Because the surface is leveled, Fn = Fg, Fg = mg
- The crates exert the same amount of force on each other because of the rule of action // reaction (Newton's Third Law)
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Answer:
the terminal velocity v_t= 202.96 m/s≅203 m/s
Explanation:
The expression for the terminal velocity
here, C_d is the drag coefficient for the cylinder is 1.15
The surface density of the air at 20°C is
ρ_surface = 1.2041 kg/m^3
the density of air at an altitude of 39000 m
ρ= 4.3/100×39000 = 0.05177 kg/m^3
now substitute these values in equation above
we get
v_t= 202.96 m/s≅203 m/s
the terminal velocity v_t= 202.96 m/s≅203 m/s
The following sentences are completed and explained below
Explanation:
A is a seasonal wind known as monsoon wind that blows in the opposite direction of normal winds.
Prevailing winds are the wind that blows mainly from a single general direction.
Seasonal winds that blow in the opposite direction of normal winds often cause drought in the winter.
The monsoon winds are seasonal winds that refers to wind systems that have a pronounced seasonal reversal of direction.
The winds that blow from single direction over a specific area of the earth is known as prevailing winds.
Answer:
Ay=v₂t + ½ gt² is the best choice to solve this problem.
The height of the cliff is = 176.4 meters.
Explanation:
Given,
initial velocity = 0m/s as it is dropped vertically
acceleration = g = 9.8 m/s²
time = 6s
Height =?
Using the equation Ay=v₂t + ½ gt², we can calculate Ay, which is the height.
So,
Ay=v₂t + ½ gt²
by substituting v, t, and g, we get:
Ay= 0 × 6 + ½ × 9.8 × 6²
Ay = 0 + 4.9 × 36
Ay = 176.4 m
