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%

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

Some material consisting of a collection of microscopic objects is kept at a high temperature. a photon detector capable of detecting photon energies from infrared through ultraviolet observes photons emitted with energies of 0.3 ev, 0.5 ev, 0.8 ev, 2.0ev, 2.5ev, and 2.8ev. these are the only photon energies observed. (a) draw and label a possible energy-level diagram for one of the microscopic objects, which has four bound states. on the diagram, indicate the transitions corresponding to the emitted photons. explain briefly. (b) would a spring–mass model be a good model for these microscopic objects? why or why not? (c) the material is now cooled down to a very low temperature, and the photon detector stops detecting photon emissions. next, a beam of light with a continuous range of energies from infrared through ultraviolet shines on the material, and the photon detector observes the beam of light after it passes through the material. what photon energies in this beam of light are observed to be significantly reduced in intensity (“dark absorption lines”)? explain briefly.

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.