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can any1 help me with these velocity question?

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Reply 1
Avatar for panjabiflower
panjabiflower
OP
1
plz can some1 help? :smile:
Reply 2
Avatar for alexmahone
alexmahone
7200m is the greatest distance.
Reply 3
Avatar for panjabiflower
panjabiflower
OP
1
alexmahone
7200m is the greatest distance.

do you know how to work out the least distance? :smile:
Reply 4
Avatar for carrotboy
carrotboy
2
for the first one, average velocity is average speed in a sense. acceleration would be 0.
velocity has a direction and a magnitude. the magnitude being speed. the direction now does not really matter.

s= d/t
s= 23km/8mins
for your average. i think!!!

for the second part, i don't understand how you're meant to know the minimum and maximum values of the speed!

i hope that is right though, please correct me if it isn't!
Reply 5
Avatar for alexmahone
alexmahone
panjabiflower
do you know how to work out the least distance? :smile:


I think the distance is always 7200m but I'm really not sure.
Reply 6
Avatar for panjabiflower
panjabiflower
OP
1
i have been asked why it is more useful to know the average speed of a car over a journey than average velocity? is the answer that speed is distance travelled within a certain time and does not take into consideration direction however velocity does and many journeys will result in the average velocity being 0 due to the reasons given in the above replies? Does any1 know what else i can add? thanx
Reply 7
Avatar for alexmahone
alexmahone
carrotboy
for the first one, average velocity is average speed in a sense. acceleration would be 0.
velocity has a direction and a magnitude. the magnitude being speed. the direction now does not really matter.

s= d/t
s= 23km/8mins
for your average. i think!!!

for the second part, i don't understand how you're meant to know the minimum and maximum values of the speed!

i hope that is right though, please correct me if it isn't!


No, you're wrong! :woo:
Reply 8
Avatar for panjabiflower
panjabiflower
OP
1
alexmahone
No, you're wrong! :woo:

it the answer to this 4.79ms^-1
Reply 9
Avatar for carrotboy
carrotboy
2
alexmahone
No, you're wrong! :woo:

i just wasted 2 whole years studying for no reason :frown:
Reply 10
Avatar for alexmahone
alexmahone
panjabiflower
it the answer to this 4.79ms^-1


It is 0 as you first said.

Edit: Average velocity=Total displacement/Total Time
hey are you referring to this post that i did?:

i have been asked why it is more useful to know the average speed of a car over a journey than average velocity? is the answer that speed is distance travelled within a certain time and does not take into consideration direction however velocity does and many journeys will result in the average velocity being 0 due to the reasons given in the above replies? Does any1 know what else i can add? thanx

btw GHOSH-5 thanks again for your help
Reply 12
Avatar for alexmahone
alexmahone
yeah, sorry.
Reply 13
Avatar for carrotboy
carrotboy
2
panjabiflower
it the answer to this 4.79ms^-1

23km = 23,000m - because there's ten laps

d/t = 23000/480

= 47.9ms^-1??
Reply 14
Avatar for alexmahone
alexmahone
carrotboy
23km = 23,000m - because there's ten laps

d/t = 23000/480

= 47.9ms^-1??


That's the avg speed, not avg velocity!
alexmahone
That's the avg speed, not avg velocity!


will average velocity be 0?
Reply 16
Avatar for carrotboy
carrotboy
2
alexmahone
That's the avg speed, not avg velocity!


oh, lol!

need to catch up with my maths and phys!
Reply 17
Avatar for alexmahone
alexmahone
panjabiflower
will average velocity be 0?


Yes!
can any of you guys help me with this?
http://www.thestudentroom.co.uk/showthread.php?t=680983

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