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tatuchka [14]
3 years ago
11

A car traveling west in a straight line on a highway decreases its speed from 30 meters per second to 23 meters per second in 2

seconds. The car's average acceleration during this time interval is
Physics
2 answers:
garik1379 [7]3 years ago
6 0
U1= 30m/s
u2= 23m/s
t=2s
a=(u2-u1)/t
a=-7/2=-3.5 m/s^2
mihalych1998 [28]3 years ago
3 0
Use the equation Vf=Vi+A(t)
Rearrange it so A is isolated: A= Vf-Vi/t
A=(23-30)/2
A=-3.5m/s^2
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motikmotik

Answer:

n_cladding = 1.4764

Explanation:

We are told that θ_max = 5 °

Thus;

θ_max + θ_c = 90°

θ_c = 90° - θ_max

θ_c = 90° - 5°

θ_c = 85°

Now, critical angle is given by;

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sin θ_c = (n_cladding/n_core)

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Plugging in the relevant values, we have;

n_cladding = 1.482 × sin 85

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Explanation:

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