Answer:
C
Explanation:
Answer A: A surface wave is a wave that travels along the surface of a medium.
Answer B, C: Electromagnetic waves are waves that have no medium to travel whereas mechanical waves need a medium for its transmission.
Answer D: The sentence in the answer D does not fit to the blank in the definition ( of the question )
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Hope this answer can help you.
Answer:
Her linear velocity (speed) is approximately 2.2 m/sec
Her angular velocity is approximately 1.26 rad/second
Explanation:
The given parameters are;
The diameter of the merry-go-round, d = 3.5 m
The number of revolutions she travels per minute = 12 revolutions per minute
Therefore, we have;
The distance she travels in one revolution = π·d = π × 3.5 m
The distance of the twelve revolutions = 12 × π × 3.5 m
The time she takes for the 12 revolutions = 1 minute = 60 seconds
Therefore, her speed = 12 × π × 3.5 m/(60 seconds) ≈ 2.2 m/sec
Her angular velocity = Angle covered/Time = 12 × 2 × π/60 ≈ 1.26 rad/second.
Answer:
a) 3.13 m/s
b) 2.8 m/s
c) 0.485 m
d) 2.8 m/s
Explanation:
a) PE @ A = KE @ B
mgh = ½ mv²
v = √(2gh)
v = √(2 × 9.8 m/s² × 0.50 m)
v = 3.13 m/s
b) PE @ A = KE @ C + Work done by friction
mgh = ½ mv² + Fd
mgh = ½ mv² + mgμd
gh = ½ v² + gμd
g (h − μd) = ½ v²
v = √(2g (h − μd))
v = √(2 × 9.8 m/s² (0.50 m − 0.1 × 1 m))
v = 2.8 m/s
c) KE @ C = EE
½ mv² = ½ kx²
mv² = kx²
x = v √(m / k)
x = (2.8 m/s) √(3 kg / 100 N/m)
x = 0.485 m
d) Since there's no friction between point C and the spring, the speed is the same as before.
v = 2.8 m/s