Ask question

Ask question

All categories

3 years ago

13

A punter kicks a football upward with an initial velocity of 48 feet per second. After how many seconds does the ball hit the gr

ound? use the formula h=rt-16t^2, where h represents height in feet and r represents the initial velocity (rate) in feet per second.

1 answer:

vfiekz [6]3 years ago

3 0

H=48t-16t^2
h=32t^2
The answer is that the football travels 32t^2?

You might be interested in

Please help me with precalculus??<br>linear and angular speed

Anit [1.1K]

13)

there are 2π radians in 1 revolution, and there are 60 seconds in 1 minute, so keeping that in mind, then,

$\bf \cfrac{4\underline{\pi} }{5~\underline{s}}\cdot \cfrac{rev}{2\underline{\pi} }\cdot \cfrac{60~\underline{s}}{min}\implies \cfrac{4\cdot 60~rev}{5\cdot 2~min}\implies \cfrac{240~rev}{10~min}\implies 24\frac{rev}{min}$

14)

$\bf \textit{linear velocity}\\\\
v=rw\quad 
\begin{cases}
r=radius\\
w=angular~speed\\
----------\\
v=32\frac{m}{sec}\\
w=100\frac{rev}{min}
\end{cases}\\\\
-------------------------------\\\\
\textit{let's convert \underline{w} to }\frac{radians}{sec}$

$\bf \cfrac{100~\underline{rev}}{\underline{min}}\cdot \cfrac{2\pi }{\underline{rev}}\cdot \cfrac{\underline{min}}{60~sec}\implies \cfrac{100\cdot 2\pi }{60~sec}\implies \cfrac{10\pi }{3~sec}\implies \cfrac{10\pi }{3}\frac{radians}{sec}\\\\
-------------------------------\\\\
v=rw\implies \cfrac{v}{w}=r\implies \cfrac{\frac{30~m}{sec}}{\frac{10\pi }{3~sec}}\implies r=\cfrac{30~m}{\underline{sec}}\cdot \cfrac{3~\underline{sec}}{10\pi }
\\\\\\
r=\cfrac{90}{10\pi }m$

15)

what is the radians per seconds "w" in revolutions per minute? just another conversion like in 13)

$\bf \cfrac{\underline{\pi} }{3~\underline{sec}}\cdot \cfrac{rev}{2\underline{\pi }}\cdot \cfrac{60~\underline{sec}}{min}\implies \cfrac{60 ~rev}{3\cdot 2 ~min}\implies \cfrac{60 ~rev}{6 ~min}\implies 10\frac{rev}{min}$

4 0

4 years ago

How to find x in a quadrilateral

evablogger [386]

X = 360 - (122+58+58)
x = 360 - 238
x = 122

6 0

3 years ago

The travel time for a plane traveling at a rate of r kilometers per hour for 290 kilometers

Lapatulllka [165]

Time = distance / rate
time = 290 / rate

7 0

3 years ago

An airplane flies with a constant speed<br> of 840 km/h. How far can it travel in<br> 1 hour?

WITCHER [35]

Answer:

840 km

Step-by-step explanation:

The speed expression ...

840 kilometers per hour

means the plane files 840 kilometers in each hour.

In 1 hour, it will travel 840 km.

5 0

2 years ago

K=11LMN what is formula for M

Lelechka [254]

M= K/11LN You just need to move everything away from the M side by using division.

7 0

3 years ago