What is the speed of an object that moves from 70 m to 68 m in 14 s?

A person jogs eight complete laps around a quarter-mile track in a total time of 12.5 min. Calculate (a) the average speed and (

Margarita [4]

$\large\displaystyle\text{$\begin{gathered}\sf \huge \bf{\underline{Data:}} \end{gathered}$}$

$\large\displaystyle\text{$\begin{gathered}\sf 1\ mile = 1609.34 \ m \end{gathered}$}$

$\large\displaystyle\text{$\begin{gathered}\sf 1/4 \ mile = 402.33 \ m \end{gathered}$}$

$\large\displaystyle\text{$\begin{gathered}\sf 12.5 \not{min}*\frac{60 \ s}{1\not{min}}=750 \ s \end{gathered}$}$

$\large\displaystyle\text{$\begin{gathered}\sf \bf{A) \ Calculate \ the \ average \ speed: } \end{gathered}$}$

$\large\displaystyle\text{$\begin{gathered}\sf 402.33 \ m*8 \ laps = 3218.64 \ m \end{gathered}$}$

$\large\displaystyle\text{$\begin{gathered}\sf d=3218.64 \ m \end{gathered}$}$

$\large\displaystyle\text{$\begin{gathered}\sf t=750 \ s \end{gathered}$}$

$\large\displaystyle\text{$\begin{gathered}\sf V=\frac{d}{t} \ \ \ \ \ \ V= \frac{3218.64 \ m }{750 \ s} \end{gathered}$}\\\\\\\large\displaystyle\text{$\begin{gathered}\sf V=4.29 \ m/s \end{gathered}$}$

$\large\displaystyle\text{$\begin{gathered}\sf \bf{B) \ Calculate \ the \ average \ speed \ in \ m/s} \end{gathered}$}$

$\large\displaystyle\text{$\begin{gathered}\sf V=402.33 \ m \end{gathered}$}$

$\large\displaystyle\text{$\begin{gathered}\sf t=750 \ s \end{gathered}$}$

$\large\displaystyle\text{$\begin{gathered}\sf V=\frac{D}{T} \ \ \ \ \ V=\frac{402.33 \ m}{750 \ s} \end{gathered}$}\\\\\\\large\displaystyle\text{$\begin{gathered}\sf V= 0.53 \ m/s \end{gathered}$}$

4 0

2 years ago

Pyramid math (algebra 1)

mixas84 [53]

5436 7699 2360 3488 2113

3 0

3 years ago

Put the following words in order from smallest to largest: atoms, matter, elements

WINSTONCH [101]

Answer:

Matter, atoms, elements.

Explanation:

Matter is just a name for anything that has mass and takes up space. Therefore, atoms are larger than matter. Atoms are the smallest bits of an element that <em>are</em><em> </em><em>still</em><em> </em><em>that</em><em> </em><em>element</em>, so, elements would be bigger than the atoms that come together to create them!

Hope this helps!

6 0

2 years ago

How long will it take a 400 W engine to lift a 100 N object up to a height of 80 m?

Norma-Jean [14]

<h3>Answer:</h3>

20 seconds

<h3>Explanation:</h3>

<u>We are given</u>;

Power of the engine as 400 watts
Force as 100 N
Distance the object is lifted up as 80 m

We are required to determine the time taken.

We need to know that power is the rate of work done

Therefore;

Power = Work done ÷ time

But, work done = Force × distance

Therefore; In this case;

Work done = 100 N × 80 m

= 8000 Joules

Since , Power = Work done ÷ time

Then, time = Work done ÷ Power

Thus;

Time = 8000 J ÷ 400 W

= 20 s

Therefore, the time taken by the engine to lift the object is 20 seconds

4 0

3 years ago

Read 2 more answers

Review Questions

harina [27]

Answer:

Milky way is a galaxy . Milky way has a spiral shape . The Milky Way has a relatively low surface brightness due to the gases and dust that fills the galactic disk. it comprises of dust particles , 200 billion stars.
they are bounded into clusters due to gravitational force out there.
when you ask how is gravity important to the galaxy within universe then ask what hold the lump of solar system together in this great cosmic soup when whole universe is expanding ? yea , there is gravity . Hravity holds these objects together and today we have a cute solar system .
The galaxies are generally observed using shapes - some are eleptical , some are spiral and some are just irregular
GRAVITY !!yes , gravity holds the shape of stars in galaxy , gravity helps in keeping thing stable in universe. gravity restricts the moon from flying away in the space as the gravity of earth atttracts it towards itself .

4 0

3 years ago