2006-12-15 01:12:34 · 11 answers · asked by jeremy h 1 in Science & Mathematics ➔ Mathematics
55 miles/hr=88.51392km/hr
time=distance/ speed
=70/(88.51392*1000) hr
=7.91*10^-4*3600 sec
=2.847 seconds
2006-12-15 01:18:50 · answer #1 · answered by Som™ 6 · 2⤊ 0⤋
Ok, simple conversion. 1 light year = the distance light travels in one year. Woohoo. Light travels at 300,000,000 meters/second. In one year, there are 365 days * 24 hours/day * 60 minutes/hr * 60 seconds/min = 31,536,000 seconds. Multiplying for the distance (300,000,000 * 31,536,000), you get 9.4608 * 10^15 meters. 70 miles per hour is equal to 31.2928 meters /sec. Using the same multiplication as above, in one year, something moving 70mpg will go (31.2928 * 31,536,000) = 9.8685 * 10^8 meters: 7 orders of magnitude less (in other words, 10 million times slower). Which gives you your answer: 9.4608 * 10^15 / 9.8685 * 10^8 = 9,586,867.31 Almost 10 million years.
2016-05-24 19:57:35 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Use known conversion factors to change 55 mph to ? m/sec
1 mi approximately = 1.61 km therefore
55mph x 1.61 km/mi = 88.55 km/hr
1 km =1000 m therefore
88.55 km/hr x 1000 m/km = 88,550 m/hr
1 hr = 3,600 sec therefore
88,550 m/hr / 3,600 sec/hr = 24.597 m/sec
distance = rate x time therefore
time = distance / rate
time = 70 m / 24.597 m/sec
= 2.85 sec (rounded hundredths )
2006-12-15 01:42:19 · answer #3 · answered by bjs820 2 · 0⤊ 1⤋
55mph =55*1.609 = 88.495 km/h
88.495/3.6= 24.582 metre/s
t=70/24.582= 2.85 s
2006-12-16 02:06:37 · answer #4 · answered by M.M.D.C. 7 · 0⤊ 0⤋
Converting, 55MPH equals 80.67 feet/second.
Converting 70 metres equals 227.5 feet
Dividing 227.5 (distance) by 80.67 (speed) equals 2.82 seconds
2006-12-15 01:19:50 · answer #5 · answered by les 4 · 1⤊ 1⤋
Just a shade under 3 seconds.
2.86 seconds to 2 d.p.
55mph = 24.4 m/s
70m / 24.4m/s = 2.86s
Cheers.
2006-12-15 01:20:30 · answer #6 · answered by chopchubes 4 · 0⤊ 0⤋
55 mph = 88.71 kilometer per hour
or divideded by 60
1.4785 kilometers per min
or divided by 60 again
.0246 kilometers per sec
multiply .0246 * 70 = 1.7249 seconds
2006-12-15 01:34:57 · answer #7 · answered by robert k 2 · 0⤊ 2⤋
Use the equations of linear motion.
Convert everthing to standardised SI units.
Then use speed = distance/ time, rearrange to find answer.
2006-12-15 04:02:18 · answer #8 · answered by oliverpenney@btinternet.com 1 · 1⤊ 1⤋
distance=70 metres
speed=55mph
time= distance/time
= 70/55
=1.272
the answer is 1.27s when rounded.
2006-12-15 01:27:11 · answer #9 · answered by tarena 2 · 0⤊ 4⤋
1 mph=0.45 m/s
so time taken=70/0.45=155.6 sec
=>2 mts 35.6 seconds
2006-12-15 01:19:15 · answer #10 · answered by raj 7 · 0⤊ 3⤋