I need help ASAP 8th GRADE SCIENCE
2 answers:
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Answer:
Explanation:
given,
speed of wave, c₁ = 7.7 m/s
angle of incidence, i = 44°
angle of refraction, r = 33°
speed of wave in second medium.
using Snell's law
n₁ sin i = n₂ sin r
now,
calculation of velocity in the medium
n₁ c₁ = n₂ c₂
Speed of wave in the second medium is equal to 6.04 Km/h
Answer:
Explanation:
<u>Uniform Acceleration </u>
When an object changes its velocity at the same rate, the acceleration is constant.
The relation between the initial and final speeds is:
Where:
vf = Final speed
vo = Initial speed
a = Constant acceleration
t = Elapsed time
It's known a train moves from rest (vo=0) to a speed of vf=25 m/s in t=30 seconds. It's required to calculate the acceleration.
Solving for a:
Substituting: