True .......................................
<span>Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive mistakes were selected when they were formed.</span>
<span>Well, the main point you should remember is that we only can hear 20hz that leads to T=0.05sec
which means that the distance leads us to velocity x time.
When calculating, you get 330 * 0.05=16.5 .
The number which you got from the previous step has to me multiplied 4 times (4 minutes) and you will get the answer you need - </span><span>a) 66.0 m.
Do hope it will help you! Regards!</span>
Answer:
a) a = 4 ft / s²
, b) a = -6 ft / s²
Explanation:
The balance is subjected to two forces: the weight of the person directed downward and the spring reaction directed upward.
When the person rides the elevator, the acceleration is zero
F - W = 0
F = W
F = 160 lb
let's find the mass of the body
W = mg
m = W / g
m = 160/32
m = 5 slug
A) when the elevator is moving up
F - W = m a
F = W + m a
F - W / m = m a
F = m (g + a)
therefore the scale reading (F) must be higher, in this case F = 180 lb
a = F / m - g
a = 180 - 160)/5
a = 4 ft / s²
b) when the elevator is stopping
in this case the direction is opposite to the speed, that is to say downwards
F- W = m (-a)
a = W - F / m
a = 130 -160 /5
a = -6 ft / s²
Solids do no take to the shape of their containers, unlike liquids and gasses which do