Answer:
Explanation:
for us to rank them we need to calculate the angle of refraction for the various materials. The angle of refraction is the angle between the refracted ray and the normal.
refractive index(n) = velocity of light in air/ velocity of light in medium
refractive index (n) = sini/sinr
lets equate the right side of both equations.
we will assume 30 degree as the angle of incidence for all materials.
(a) water
sinr = 0.75c/c *sin30
sinr = 0.375
r= arcsin0.375
r=22.02°
(b) ethyl alcohol
sinr = 0.7c/c *sin30
sinr = 0.35
r= arcsin0.35
r=20.49°
(c) crown glass
sinr = 0.6c/c *sin30
sinr = 0.3
r= arcsin0.35
r=17.46°
it is observed that the angle of refraction decreases as the velocity of light in glass decreases.
ranking the materials according to how much the light ray bends toward the normal, from most bending to least bending we have;
Crown glass > ethyl alcohol> water
Answer:
20.4m/s²
Explanation:
Given parameters:
Initial velocity = 0m/s
Distance = 53m
Time = 5.2s
Unknown:
Acceleration = ?
Solution:
This is a linear motion and we use the right motion equation;
S = ut + at²
S is the distance
u is the initial velocity
a is the acceleration
t is the time
Insert the parameters and solve;
53 = (0x 5.2) + x a x 5.2
53 = 2.6a
a = = 20.4m/s²
Answer:
(i) , (ii)
, (iii)
Explanation:
(i) and
represent the points where particle has a velocity of zero and spring reach maximum deformation, Given the absence of non-conservative force and by the Principle of Energy Conservation, the position where particle is at maximum speed is average of both extreme positions:
(ii) Maximum accelerations is reached at and
.
(iii) Greatest net forces exerted on the particle are reached at and
.