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Nataliya [291]
3 years ago
6

Please help brainliest, five star, thanks please helpppppppppp

Biology
2 answers:
WINSTONCH [101]3 years ago
8 0

Answer:

B(sperm production)

D(appearance of secondary sex characteristics)

Explanation:

anastassius [24]3 years ago
6 0

Answer:

its b and d hope this help

Explanation:

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1.true2.true3.true

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1.Compare and contrast communication by molecular signal with communication by enzyme-linked receptor.
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A record turntable is rotating at 33 rev/min. A watermelon seed is on the turntable 7.8 cm from the axis of rotation. (a) Calcul
Novosadov [1.4K]

Given data:

● Angular velocity of the turntable ω = 33 rev/min

Therefore,

ω = 33 rev/min

ω = 33rev/min × 2π rad/rev × 1 min/60 sec = 3.45 rad/s

● The distance of the watermelon seed from the axis of rotation r = 7.8 cm = 0.078 m

● μs = the coefficient of static friction

Section a:

The seed is undergoes circular motion and it is been effected by centripetal acceleration.

ac = rω^2

ac = 0.078 × 3.45^2

ac = 0.9284 m/s^2

Therefore,

the centripetal acceleration of the seed is 9.274 m/s^2

Section b:

If the seed is observed not to slip at the course of the circular motion, then the supplied frictional force given by the seed and surface of turntable would at least be equivalent to the centripetal force working on the seed.

Centripetal Force = Frictional Force

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μs = rω^2 /g

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------------

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the coefficient of static friction is 0.09464.

6 0
2 years ago
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