Astudent calculates the density of iron as 6.8 g/cm3 using lab data for mass and volume. a handbook reveals that the correct value is 7.39 g/cm3. what is the percent error?

7.983761 %

Explanation:

Step 1: What is percent error ?

⇒Percent error is calculated using the following formula:

⇒% error  =  | Experimental value-theoretical value/theoretical value |  x 100%

⇔ this can be written as well as : error = (| Experimental value/ theoretical value | - | Theoretical value / Theoretical value | ) * 100%

⇒ which, after simplifying, will become :

%error = (| Experimental value - theoretical value  - 1 |) x 100%

For this case, this means :

%error = ( |6.8 g/cm³ - 7.39g/cm³  - 1 | ) x100%

%error = | 0.92016238 -1 | x100%

%error = |-0.07983761 | x100%

%error = 0.07983761 x100%

%error = 7.983761 %

The %error is 7.983761 %

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.