The answer is the Dinosaurs and the Pterosaurs.

The Jurassic Period follows Triassic Period. It is known as the Age of Reptiles. the land was dominated by the dinosaurs and the flying pterosaurs. Both groups are reptiles. Other animals and plants during this period have just recovered from the largest mass extinctions on Earth.

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3 years ago

Helicopter blades withstand tremendous stresses. In addition to supporting the weight of a helicopter, they are spun at rapid ra

Radda [10]

NOTE: Check your formula sheet if you have one these are often there.

Ac = $\frac{V^{2} }{r}$ = rω^2

We know r = 4.00m

but what is ω?

ω = $\frac{2π}{T}$ = 2π*f

f is our frequency. we want it in seconds so we can divide by 60.

300/60 = 5rev/s

Ac = rω^2 = (4)(5)^2 = 100m/s

(b) Linear speed or v is equal to v = ω = (5)(4) = 20m/s
340 / 20 = 17

The speed of sound is 17 times faster.

NOTE: finished physics so i might be rusty and use an equation wrong. Tell me if something doesnt make sense. Im still new to this myself.

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2 years ago

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