The correct option is D.
The critical angle is defined as the angle of incidence, which provides an angle of refraction of 90 degree. At any angle of incidence greater than the critical angle, all the light will totally reflected, resulting in total internal reflection.Thus, the critical angle is equal to the refractive index.
Answer:
initial speed is 13.36 m/s
Explanation:
given data
mass = 2 kg
velocity = 10 m/s
distance = 20 m
friction= 0.2
to find out
initial speed
solution
we find first friction force that is
friction force = friction ×mass×g ...........1
put here value
friction force = 0.2 × 2 × 9.81
friction force = 3.924 N
here a will be -ve due to friction
- friction force = mass × acceleration
acceleration = - friction force / mass
acceleration = - 3.924 / 2
acceleration = - 1.962 m/s²
and we know velocity formula that is
V² = V(i)² + 2as
put here value
10² = V(i)² + 2(-1.962)(20)
V(i) = 13.36
so initial speed is 13.36 m/s
Answer:
A lot of the earth oxygen comes from the ocean around 50%-80%
Explanation:
Answer:
A) The wave that travels through the rail reaches the microphone first.
B) separation in time between the arrivals of the two pulses is 0.01539 seconds.
Explanation:
Detailed explanation and calculation is shown in the image below
