Which of the following statements are true about measurements and units?
1 answer:
<span>A. In the SI system, unit prefixes are used to indicate powers of ten --> TRUE
The prefixes are used to indicate powers of ten: examples are kilo (k), which indicates </span>
, or mega (M), which indicates 
.<span>
B. The unit of length in the SI system is the meter --> TRUE
Lengths are measured in meters in the SI system.
C. Measurements must include both numbers and units --> TRUE
Every measurement must include the number and the unit. Example: for a length, we must write L=10.0 m, where 'm' refers to 'meters'.
D. The SI unit system is used only in Asia --> FALSE
The SI system is used in the whole world.</span>
The prefixes are used to indicate powers of ten: examples are kilo (k), which indicates </span>
B. The unit of length in the SI system is the meter --> TRUE
Lengths are measured in meters in the SI system.
C. Measurements must include both numbers and units --> TRUE
Every measurement must include the number and the unit. Example: for a length, we must write L=10.0 m, where 'm' refers to 'meters'.
D. The SI unit system is used only in Asia --> FALSE
The SI system is used in the whole world.</span>
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Answer:
The total electrical power we are using is: 1316 W.
Explanation:
Using the ohm´s law and the formula for calculate the electrical power, we can find the total electrical power that we are using. First we need to find each electrical power that is using every single component, so the radio power is:
, so the radio power is:
, then we find the pop-corn machine power as:
and finally there are three light bulbs of 110(W) so: P=3*110(W)=330(W) and the total electrical power is the adding up every single power so that: P=330(W)+770(W)+216(W)=1316(W).