course Phy 121
please let me know if you get this
If the velocity of the object changes from 4 cm / sec to 16 cm / sec in 8 seconds, then at what average rate is the velocity changing? d/t=v take 16-4 to get 12 then 12/8 and get 1.5cm/s
These quantities have units. You have the right numbers, which is a good start, but you are missing both the units and the meaning of your calculation.
You are not calculating v, i.e., velocity, you are calculating the rate of change of velocity with respect to clock time.
What is the definition of average rate of change of velocity with respect to clock time?
What is the change in velocity?
What is the change in clock time?
What therefore is the average rate of change of velocity with respect to clock time?
A ball rolling from rest down a constant incline requires 8.2 seconds to roll the 97 centimeter length of the incline.
?What is its average velocity? 97/8.2=11.83cm/sec
An object which accelerates uniformly from rest will attain a final velocity which is double its average velocity.
?What therefore is the final velocity of this ball? 11.8292+11.8292=23.658cm/s
?At what average rate is the velocity of the ball therefore changing?
You have not answered this question.
What is the definition of average rate of change of velocity with respect to clock time?
What is the change in velocity?
What is the change in clock time?
What therefore is the average rate of change of velocity with respect to clock time?
An automobile accelerates uniformly down a constant incline, starting from rest. It requires 10 seconds to cover a distance of 132 meters. At what average rate is the velocity of the automobile therefore changing? 132/10=13.2m/s
This is the average rate of change of position.
You need to follow the pattern of reasoning established in the above problems to work out this problem.
You did several things right here, but you missed some things too. See my notes.
&#Please respond with a copy of this document, including my comments, inserting your answers, revisions and/or questions. Indicate insertions by &&&&.
&#
course Phy 121
An object travels a distance of 32 cm in 17.6 seconds from start to finish. If its acceleration is uniform and its initial velocity zero, then what are its average velocity, acceleration and final velocity?v=x/t = 32/17.6=1.81/17.6=.1033
You need to use units in your quantities, and you need to show the steps with units and preferably some explanation.
There are three quantities to find here. You have correctly calculated one of them, but you haven't identified it or used units.
course Phy 121
An automobile traveling a straight line is at point A at clock time t = 4 sec, where it is traveling at 10 m/s, to point B at clock time t = 11 sec, where it is traveling at 20.5 m/s. Point A is 75 meters from the starting point and point B is 115 meters from the starting point. What are the average velocity and the average acceleration of the automobile during the specified time? What evidence is there that the acceleration is or is not uniform?av=v-v0/t-t0= 115-75/11-4=5.714
Very good except you didn't use units or correctly identify this quantity.
aa=20.5-10/11-4=1.5m/s2
You did end up with the right units, though you didn't use units in your calculation. You have more or less identified this as the average acceleration, so except for the unit calculations this is good.
You haven't answered the question about uniformity of acceleration.