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Old Aug 8th 2010, 08:50 AM   #1
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rate

1. what are some uses of speed in daily life?

2. Which of the following is not a rate?
a. Amount of food consumed by each family member
b. Daily cargo handled at PSA
c. Petrol consumed per day
d. Speed

3. Which statement correctly describes speed?
a. The distance covered per 1 liter of petrol
b. The time taken to travel 1 m
c. The distance travelled in 1 second
d. The distance travelled at 1 m/s


my ans:
1. we need a high speed to win a car race. that's the only usage of speed that I can think of. Are there others?

2. a. not a rate because there is no information about time
b. rate. can be stated as number of cargo per day
c. rate
d. rate
Right or wrong?

3. a. not speed
b. not speed
c. speed
d. not speed
Right or wrong?

Thank you very much
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Old Aug 9th 2010, 01:01 AM   #2
ohm
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hi,
If u r not interested in car race,doesn't mean that there is no role of speed in ur life. Every time u change ur position or go somewhere u covers a distance and for this u take time and so speed comes here. Many situation comes in life e.g.
1) when u want to go a city say from city 'A' to city 'B', don't you want to know by which train u can reach soon.
2)whenever u go from one place to other, ur speed decides time taken by you.
There r many examples . Even when u were posting these questions, had u thought about typing speed?
Your next question is about "rate"
What do u mean? Coz rate is not only concerned with time.
Rate of anythin can be measured with respect to anything.e.g. Rate of change in 'x' w.r.t. 'y'
Now ur last question was about speed
Speed is distance travelled per unit time. Here unit time means 1s,1 hr,1min etc
In SI system it is 1s i.e. Distance covered in one second
V=s/t
If t=1, v=s/1 or v=s i.ea speed=distance travelled in 1s
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Old Aug 9th 2010, 01:51 AM   #3
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Originally Posted by ohm View Post
hi,
If u r not interested in car race,doesn't mean that there is no role of speed in ur life. Every time u change ur position or go somewhere u covers a distance and for this u take time and so speed comes here. Many situation comes in life e.g.
1) when u want to go a city say from city 'A' to city 'B', don't you want to know by which train u can reach soon.
2)whenever u go from one place to other, ur speed decides time taken by you.
There r many examples . Even when u were posting these questions, had u thought about typing speed?
ok, I think I get it

Your next question is about "rate"
What do u mean? Coz rate is not only concerned with time.
Rate of anythin can be measured with respect to anything.e.g. Rate of change in 'x' w.r.t. 'y'
ok I'll try a new answer for (a); it is rate because we can see it as food consumed / member. am I right?

if I use a more specific definition of rate, which is an expression that shows how a quantity changes with time, then (a) is not rate because no time related. am I right?

Now ur last question was about speed
Speed is distance travelled per unit time. Here unit time means 1s,1 hr,1min etc
In SI system it is 1s i.e. Distance covered in one second
V=s/t
If t=1, v=s/1 or v=s i.ea speed=distance travelled in 1s
so I suppose my answers are right? Just need confirmation on my answers.

Thank you very much
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