# 0.11 Phy1080: motion -- variable velocity and acceleration  (Page 9/19)

 Page 9 / 19

Tactile graphics

The velocity values shown in Figure 6 are plotted in the image that is contained in the file named Phy1080b1.svg, along with theheight values and the acceleration values.

Analysis of the results

The difference between Figure 4 and Figure 6 is the addition of a column of velocity information on the right in Figure 6 . As you can see, the velocity begins with a positive value of 100 feet/second at the top of thevelocity column.

The velocity goes to zero somewhere between 3 and 3.25 seconds, which is the point where the height of the arrow reaches its maximum.

At 3.25 seconds, the velocity switches from positive to negative meaning that the arrow begins falling back toward the earth. The velocity reaches-100 feet/second somewhere between 6.25 and 6.5 seconds, which is about the same time that the arrow hits the ground.

Plot the velocity curve

I believe you might find it useful to plot the velocity curve on the graph board without removing the height curve if you can. That will give you a goodopportunity to use your hands to "see" the big picture insofar as the relationship between the height (displacement) and the velocity are concerned.

When you do that, hopefully you will recognize that the velocity curve for this particular situation is a straight line with a negative slope. Thatstraight line crosses the horizontal axis going from positive territory into negative territory about half way between the original release of the arrow andthe point where the arrow strikes the ground.

Analysis of the code

A comparison of Listing 2 with Listing 1 shows the addition of the following variables:

• var oldT = 0; //previous time in seconds
• var delT = 0; //change in time in seconds
• var oldH = h0; //previous height in feet
• var delH = 0; //change in height in feet

Save values for use in next iteration

As you will see when I get into an explanation of the while loop, the variables oldT and oldH are used to save the time value and the height value during each iterationto make those values available during the next iteration.

Compute changes in time and height

Inside the while loop, the current value of t and the value stored in oldT are used to compute the change in time since the previous iteration. The current value of h and the value stored in oldH are used to compute the change in height since the previous iteration. These change values are saved in the variables named delT and delH .

Velocity is the ratio of the changes

In this case, the value in delH represents the displacement of the arrow during the time interval and the value stored in delT represents the length of the time interval. As you already know, the velocity isthe ratio of those two values. The value for velocity is computed along with the time and the height and then the script executes the next iteration of the while loop.

The while loop

The while loop in Listing 2 begins the same as in Listing 1 . After the new height value is computed, the script performs the computationsdescribed above to estimate and display the velocity for the time interval since the previous iteration.

can someone help me with some logarithmic and exponential equations.
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
Commplementary angles
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
a perfect square v²+2v+_
kkk nice
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
rolling four fair dice and getting an even number an all four dice
Kristine 2*2*2=8
Differences Between Laspeyres and Paasche Indices
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
is it 3×y ?
J, combine like terms 7x-4y
im not good at math so would this help me
yes
Asali
I'm not good at math so would you help me
Samantha
what is the problem that i will help you to self with?
Asali
how do you translate this in Algebraic Expressions
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
what's the easiest and fastest way to the synthesize AgNP?
China
Cied
types of nano material
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
what is nanomaterials​ and their applications of sensors.
what is nano technology
what is system testing?
preparation of nanomaterial
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
what is system testing
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
can nanotechnology change the direction of the face of the world
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
how did you get the value of 2000N.What calculations are needed to arrive at it
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