Saturday
August 23, 2014

Homework Help: physics

Posted by physics on Saturday, March 14, 2009 at 10:57am.

please check these:
Which interaction of nature binds atoms and molecules by attracting unlike charges and repulsing like charges?
a. strong b. weak c. electromagnetic d. gravitational
i got A, but someone said C , so i just want to make sure

How is a motor's mechanical energy able to perform mechancical work?
a. mechanical energy is converted into electrical energy
b. a current is generated by a rotating loop in a magnetic field
c. electrical energy is ocnverted into a magnetic force
d. a shaft connected to the rotating coil is attached to some external force

D

the rms current in an ac current is 3.6A. Find the maximum current

5.1 A

Which of the following statements about electromagnetic radiation is true?
a. it transfers energy to objects in the path of the electromagnetic waves
b. it can be converted to other energy forms
c. it transports the enrgy of electromagnetic waves
d. all of the above

B

What causes the dark lines in the absorption spectrum of an element to occur?
a. photons are absorbed when electrons jump from a higher-energy to a lower-energy state
b. photons are emitted when electrons jump from a higher-energy to a lower-energy state
c. photons are absorbed when electrons jump from a lower-energy to a higher-energy state
d. photons are emitted when electrons jump from a lower-energy to a higher-energy state

C

thanks!

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