tgffff You can enter units that are combinations of units with prefixes. However
ID: 914167 • Letter: T
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tgffff You can enter units that are combinations of units with prefixes. However, you must maintain the same unit system given in the problem. For example, this question uses the SI unit system, Therefore an answer in U.S customary units, such as miles per hour would not be accepted as correct. A car traveling with constant speed travels 150 km in 7200 s What is the speed of the car? Express the speed to two significant figures and include the appropriate units. 2.08 Submit Hints My Answers Give tta Review Part Incorrect, One attempt remaining: Try AgainExplanation / Answer
1) Speed equals distance over time. Care should be taken in the conversion of units.
The units most commonly used in car measurements are km / h. If a car travels 150 km in 7200s, then, you will have to transform seconds to hour. Let's do it step by step.
1min ---- 60s
x1------ 7200s
x1= 120 min.
1h ----- 60 min
x2 ------ 120 min
x2 = 2hrs.
Then using the formula for speed.
V = d/t
V = 150 km/ 2hrs
V = 75 km/h
2) This conversation is even more simple.
This is a rule that you must learn and serves to many other measures.
gr to kg / 1000
gr to mg * 1000
Scientific notation would look as follows;
When the comma wheel clockwise is negative and to the left is positive.
0.005 gr = 5 * 10-3 gr or 5E-3 gr
If you look well you can realize this:
5 * 10-3 = 0.005 gr / 10 ^ 3 times = 0.005 gr * 1000 = 5 mg
So, mg = 10^-3 gr and kg = 10^3 gr
Regards.
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