- constant speed = 13.5 km per hour
- distant it travelled is 5 cm [i.e. very fast]
- what is the time it travelled in?
I actually made this question up to teach my sister. My sister and my I both got the same answer but my brother got a completely different answer.
2007-07-08 03:01:15 · 18 answers · asked by YounZ E 2 in Science & Mathematics ➔ Mathematics
My answer was 0.0133308 seconds where as my brother got 1 x 10-9 seconds
2007-07-08 03:18:09 · update #1
my brothers answer: was 1 x 10^9 seconds
2007-07-08 03:19:25 · update #2
could you please include units as this is v. important in this question, Cheers
2007-07-08 03:20:44 · update #3
assuming no forces such as air resistance and other frictional forces are not involved
2007-07-08 03:23:01 · update #4
speed=13.5 x 5/18 m/sec (to convert into m/sec from km/hr.)
=3.75 m/sec
Time=distance/speed
Time=5/3.75 sec
=1.33 seconds.
2007-07-08 03:05:45 · answer #1 · answered by Anonymous · 0⤊ 3⤋
13.5 km/hr is the speed and 5 cm is the distance travelled.
Let us convert the speed into cms/sec.
13.5 x 1000 x 100 / 3600 = 375 cms/sec
Time = 5/375 secs
and since this is a small quantity we can multiply by 1000 to get milliseconds.
The answer is 13.333... milliseconds.
2007-07-08 03:09:40 · answer #2 · answered by Swamy 7 · 0⤊ 1⤋
Lord, save us all. How did we ever make it to the moon?
60 sec/min X 60 min/hr = 3600 sec/hr = 3.6x10^3 sec/hr
1 km = 1000 m = 1x10^3 m
1 cm = 1/100 m = 1x10^-2 m
When multiplying the tens with exponents, add (or subtract) the exponents.
When dividing by a number with an exponential ten, the number is a denominator and the exponent of ten is reversed. So one divided by 3x10^-2 = .333x10^2, or 33.3.
You don't need to use exponents if you keep track of the zeros, though.
5x10^-2 m X 1/(13.5 km/hr) =
5x10^-2 m X (3.6x10^3 sec / 1.35x10^4 m) =
[(5 X 3.6)/1.35] x 10 ^ [(-2) + (3) + (-4)] =
13.33x10^-3 = 1.33x10^-2 sec.
By counting the zeroes, 13500 m/h X 100 cm/m = 1,350,000 cm/hr.
1,350,000 cm/hr divided by 3600 sec/hr = 375 cm/sec
5 cm divided by 375 cm/sec = 0.0133 sec
2007-07-08 03:44:31 · answer #3 · answered by Anonymous · 1⤊ 0⤋
oftentimes distance is measured in the two metres (m) or kilometers (km). Time would desire to be seconds (s) or minutes (m) velocity, is a mix of distance and time. E.g 60m/s (60 metres in line with 2nd) does that help?
2016-12-10 05:35:39 · answer #4 · answered by carra 4 · 0⤊ 0⤋
The answer is 0.0133333333 seconds
13.5 x 1000mts x 100/5 = 2,700,000
I hr = 3,600 seconds
2,700,000 divided by 3,600 = 75
100 x 0/75 = 0.01333 (repetitive) seconds
2007-07-08 03:30:24 · answer #5 · answered by ComputersNstuff 3 · 1⤊ 0⤋
This is a very small distance.
5 cm = 0.00005 km
t= d/v=0.00005km/13.5(km/hr)= 0.0000037 hours =0.01333sec
If you meant 5km then multiply everything by 100000.
2007-07-08 03:17:37 · answer #6 · answered by ? 5 · 1⤊ 0⤋
convert constant speed to cm per second
13.5 Km/hour * 100000cm/1Km * 1 hour/3600sec
= 0.375cm per second
375 cm/sec = 5 cm / T
T = 5 cm / 375 cm/sec
T = 0.013333 sec
2007-07-08 03:08:23 · answer #7 · answered by Worm Brain 2 · 2⤊ 1⤋
13.5= (5/10^-5) /time
time= 5/10^-5/ 13.5= 3.7037037 × 10-6hours
2007-07-08 07:39:32 · answer #8 · answered by ~*tigger*~ ** 7 · 0⤊ 0⤋
0.013333 sec, or 13.3 milliseconds
Calc: 13.5km = 13500m. 13500 m/hour = 375 cm/sec (13500/60, /60)
5/375= 0.01333333333&c
2007-07-08 03:36:38 · answer #9 · answered by champer 7 · 1⤊ 0⤋
time = [(5cm)(1 hr)]/(13km) =
[(5cm)(1 hr)(60min/hr)(60sec/min)]/[(13km)(1000m/km)(100cm/m)] =
[(5cm)(3600sec)]/[(13)(100000)cm] =
[(18000)/(1,300,000)]sec =
(18sec)/1300 =
(9/650)sec =
.013333333.....second.
2007-07-08 04:00:00 · answer #10 · answered by Mark 6 · 1⤊ 0⤋