The Cenozoic is the age of mammals.
It was during the Cenozoic that these lifeforms proliferated:
- Grasses
- Flowering plants
- Birds
- Rodents
- Snakes
Also, Antarctica developed its ice sheet through most of the Cenozoic.
It affects us in a negative way because it makes things much easier for us, yet in the future it will leave us without the ability to do the things we had to do before the mobility. It affects the way we form relationships because we don't talk in person, we talk through mobile devices. We form relationships with people we may not even know.
NOTE: Check your formula sheet if you have one these are often there.
Ac =

= rω^2
We know r = 4.00m
but what is ω?
ω =

= 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.
Shape is correct. This is because we're talking about the door being rectangular, it is (B).