Convert this measurement 664.2 km=____cm
2 answers:
For metric conversion, you can remember this acronym for help:
King Henry died unusually drinking chocolate milk. Which stand for:
Kilo - unit * 1000
Hecto - unit * 100
Deca - unit * 10
Unit - unit * 1
Deci - unit *
Centi - unit *
Milli - unit *
Kilometers and centimeters are five places apart apart, so you move the decimal point in 664.2 to the right five times, which means 664.2 km = 66420000 cm.
To avoid confusion on which direction to move the decimal point, imagine two shapes on each end of a scale. On each end, there is one large shape and one small shape. There has to be one of each on either side for it to balance. For this problem, a kilometer is a larger unit than a centimeter, so this means that the blank space needs to have a number greater than 664.2, or else the scale won't balance. Hope this helped.
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Answer:
Explanation:
The equation for this is
F - f = ma
The thing that gets strange here is that, because the student is pulling his sister on the sled with the rope at an angle, some of his efforts are being wasted. The sled is only going to move forward (horizontally), so the vertical component of that force is useless. He's not actually pulling horizontally with that much force; we have to figure out how much using the following equation:
to get that
F = 352 N
Everything else falls into place quite easily into the equation now:
352 - 180 = 41a and
172 = 41a so
a = 4.2 m/s/s
