<< Chapter < Page Chapter >> Page >

Answers:

1. Enter the following into the Google calculator and press Enter to produce the results shown.

  • convert 2205 lb to kg = 1000.17118 kilograms
  • convert 33.6 mph to m/s = 15.020544 meters / second
  • 1000 kg*15 m/s = 15000 m kg / s

Therefore, the initial momentum = 15000*kg*m/s at 0 degrees

2. 1000 kg*30 m/s = 30000 m kg / s at 0 degrees

3. 2000 kg*15 m/s = 30000 m kg / s at 0 degrees

4. 2000 kg*30 m/s = 60000 m kg / s at 0 degrees

Change in momentum due to change in speed and direction

A car with a weight of 10000 newtons is moving in a direction of 90 degrees at 40m/s. After going around a curve in the road, the car is moving in a direction of 0 degrees at 20 m/s. What is the change in momentum of the car?

Solution:

While this problem could be solved using the Google calculator, because of the number of steps involved, JavaScript is probably a better approach.

The solution script for this problem is shown in Listing 1 .

Listing 1 . Solution script.
<!---------------- File JavaScript01.html ---------------------><html><body><script language="JavaScript1.3">//The purpose of this function is to receive the adjacent // and opposite side values for a right triangle and to// return the angle in degrees in the correct quadrant. function getAngle(x,y){if((x == 0)&&(y == 0)){ //Angle is indeterminate. Just return zero.return 0; }else if((x == 0)&&(y>0)){ //Avoid divide by zero denominator.return 90; }else if((x == 0)&&(y<0)){ //Avoid divide by zero denominator.return -90; }else if((x<0)&&(y>= 0)){ //Correct to second quadrantreturn Math.atan(y/x)*180/Math.PI + 180; }else if((x<0)&&(y<= 0)){ //Correct to third quadrantreturn Math.atan(y/x)*180/Math.PI + 180; }else{//First and fourth quadrants. No correction required. return Math.atan(y/x)*180/Math.PI;}//end else }//end function getAngledocument.write("Start Script</br>"); var weight = 10000//Nvar g = 9.8// m/s^2 //Find the mass of the carvar mass = weight/g;// kg var ang1 = 90;//initial angle in degreesvar ang2 = 0; //final angle in degrees var speed1 = 40;//initial speed in m/svar speed2 = 20;//final speed in m/s var ang1r = ang1*Math.PI/180;//initial angle in radiansvar ang2r = ang2*Math.PI/180;//final angle in radians //Remember, momentum is a vector quantity and momenta must// be added and subtracted using vector arithmetic. //Compute the components of the change in momentum.var P1x = mass * speed1 * Math.cos(ang1r); var P1y = mass * speed1 * Math.sin(ang1r);var P2x = mass * speed2 * Math.cos(ang2r); var P2y = mass * speed2 * Math.sin(ang2r);var deltaPx = P2x-P1x;//change in horizontal component var deltaPy = P2y-P1y;//change in vertical component//Compute the magnitude of the change in momentum using // the Pythagorean theorem.var deltaPm = Math.sqrt(deltaPx*deltaPx + deltaPy*deltaPy); //Compute the angle of the change in momentum usiing// trigonometry. var deltaPa = getAngle(deltaPx,deltaPy);document.write("The givens." + "</br>"); document.write("weight = " + weight.toFixed(0)+ " kg</br>"); document.write("speed1 = " + speed1.toFixed(0)+ " m/s</br>"); document.write("angle 1 = " + ang1.toFixed(0)+ " degrees</br>"); document.write("speed2 = " + speed2.toFixed(0)+ " m/s</br>"); document.write("angle 2 = " + ang2.toFixed(0)+ " degrees</br>"); document.write("Computed mass." + "</br>"); document.write("mass = " + mass.toFixed(0) + " kg</br>"); document.write("Components of momentum vectors." + "</br>"); document.write("P1x = " + P1x.toFixed(0) + "</br>"); document.write("P1y = " + P1y.toFixed(0) + "</br>"); document.write("P2x = " + P2x.toFixed(0) + "</br>"); document.write("P2y = " + P2y.toFixed(0) + "</br>"); document.write("Components of momentum change vectors."+ "</br>"); document.write("deltaPx = " + deltaPx.toFixed(0) + "</br>"); document.write("deltaPy = " + deltaPy.toFixed(0) + "</br>"); document.write("Magnitude and angle of change vector."+ "</br>"); document.write("deltaPm = " + deltaPm.toFixed(0)+ " m kg/s</br>"); document.write("deltaPa = " + deltaPa.toFixed(0)+ " degrees</br>"); document.write("End Script");</script></body></html>

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Accessible physics concepts for blind students. OpenStax CNX. Oct 02, 2015 Download for free at https://legacy.cnx.org/content/col11294/1.36
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Accessible physics concepts for blind students' conversation and receive update notifications?

Ask