Check my answers: the voltage across a 10-ohm resistor carrying 3 amps must be? i got 30 volts-v=? , i=3 amps, r= 16 ohm. v= 30 amps * 10 ohm=30 volts
a 4-ohm resistor is connected in parallel with a 6 ohm resistor. what is the total resistance of this pair of resistors? i got 6.87 ohms
rt=r1+r2/r1+r2 = rt= 4 ohm+6ohm/4 ohm+6ohm= rt=.25+.167/.25+.167=6.87
how i got .25 and .167 its from the decimal 1/4=.25 and 1/6=.167
the power dissipated in a 4-ohm resistor carrying 3 amps is? i wasn't too sure about this one, but i got 12 watts this is how i did it: power=current * voltage, power= 4 ohm* 3 amps= 12 watts
what is a device that produces ac electricity? why does our power grid use ac electricity? (for the first part i got an alternator and for the second part i don't understand)

Hey.. ♥️♥️ me in solving this question

The lights used by mark watley (played by matt damon) during the film the martian seem to be metal halide lamps. metal halide lamps are filled with vaporized mercury and metal-halogen compounds. when an electric current is passed through the lamp, the tube begins to glow a bright white/blue color. if you were to pass this light through a prism to separate the individual light frequencies, you would see a rainbow just as you would if using natural sunlight because of the complexity of the metal halide gas and the vast amount of possible electron transitions. (the study of light in this way is known as spectroscopy and allows astronomers to know exactly what atoms compose distant stars, simply by looking at the light they emit. the spectral lines an atom produces uniquely identifies that atom just like a fingerprint uniquely identifies a person. the momentum equation and energy equation that we have used above can be combined to give the following equation: c = e p where again p is the phonon momentum, e is the photon energy and c is the speed of light. when you divide the photon energy found in #6 by the photon momentum found in #4, do you get the speed of light? (if not, check your work for questions #4 through #6). yes no

The mantle is made up of which structural zones?