Which of the following would be used in luminosity calculations?
candela
joule
kilogram
ampere
2. work, measured in joules, is force × distance.
if the unit of force is kg⋅m/s2 , then which of the following is the correct description of joule in terms of si base units?
kg⋅m/s3
kg⋅m/s2
kg⋅m/s
kg⋅m2/s2
3.in an experiment, you calculate newton's universal gravitational constant to be 7.34×10−11 n⋅m2/kg2 . the accepted value is 6.67×10−11 n⋅m2/kg2 .
what is your percent error?
0.01%
0.1%
5%
10%

1) joule

2)

3)

Explanation:

1) Luminosity is the amount of light emitted (measured in Joule) by an object in a unit of time (measured in seconds). Hence in SI units luminosity is expressed as joules per second (), which is equal to Watts ().

This amount of light emitted is also called radiated electromagnetic power, and when this is measured in relation with time, the result is also called radiant power emitted by a light-emitting object.

Therefore, if we want to calculate luminosity the Joule as a unit will be used.

2) Work is expressed as force   multiplied by the distane   :

Where force has units of   and distance units of .

If we input the units we will have:

 This is 1Joule () in the SI system, which is also equal to

3) The formula to calculate the percent error is:

Where:

is the experimental value

is the accepted value

This is the percent error

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