Hello there, to answer your question...
Surface Area = 4πr2
= 4×π×52
= 100π
<h2>
= 314.159</h2>
Answer:
It's 79 I took the test
Stay Alive ~ T∅P I-/
Step-by-step explanation:
Answer:
![c. \ h=-16t^2+20t+3](https://tex.z-dn.net/?f=c.%20%5C%20h%3D-16t%5E2%2B20t%2B3)
Step-by-step explanation:
This is a problem of projectile motion. We can write the equation of the height of the ball after t seconds as follows:
![h=H+v_{0y}t-\frac{1}{2}gt^2](https://tex.z-dn.net/?f=h%3DH%2Bv_%7B0y%7Dt-%5Cfrac%7B1%7D%7B2%7Dgt%5E2)
Being H the height when the player hits the ball (t=0s) and
the initial upward velocity. According to this formula,
. We have chosen this equation as the correct because
, that is, this is the more logical answer given that the player hits the ball at
and when this happens, the ball is 3 feet from the ground.
QUESTION:
A battery was charged. When the charging began, it was 23 percent full. After 30 minutes of charging, the battery was 89 percent full. how fast did the battery charge and how long did it take?
Solution :
<u>Given</u>
- Initial amount of charge = 23%
- Amount after charge = 89%
<u>procedu</u><u>re</u>
Let the rate of charging be r .
r = (change in charge level) / (time interval) = (89% - 23%) / (30 min) = 2.2 % per minute
charge = (rate of charging)(time) + (initial charge)
100% = r*t + 23%
100% = (2.2 %/min)t + 23%
Solve for t and get
t = [(100 - 23) / 2.2]
Answer = 35 min