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NikAS [45]
3 years ago
9

A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency isA) 30 hertz and it travels at 60 m/s.B) 60 hertz a

nd it travels at 30 m/s.C) 1800 hertz and it travels at 2 m/s.
Physics
1 answer:
fredd [130]3 years ago
3 0

Answer:

B) 60 hertz and it travels at 30 m/s

Explanation:

The frequency of a wave corresponds to the number of complete vibrations per second. The wave in this problem has 60 vibrations per second, so its frequency is

f=\frac{60 vibrations}{ 1 s}=60 Hz

The speed of the wave instead is given by the distance travelled divided by the time taken. In this problem:

d = distance travelled = 30 m

t = time taken = 1 s

So, the speed of the wave is

v=\frac{d}{t}=\frac{30 m}{1 s}=30 m/s

so, the correct answer is

B) 60 hertz and it travels at 30 m/s

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A coin is placed on a large disk which rotates uniformly at a rate of 1 rot/s. The coefficient of friction between the coin and
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r = 0.02 m

Explanation:

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speed = 1 rps = 1x 60 = 60 rpm

coefficient of friction (μ) = 0.1

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to get how far from the center of the disk the coin can be placed without having to slip off we equate the formula for the centrifugal force with the frictional force on the turntable force

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