Sadly, we"re required to the inquiry without the benefit of the perform of choices, which, for some reason, you decided not to let united state see.Index that refraction that a problem = (speed of irradiate in vacuum) / (speed of light in the substance).Any number greater than " 1 " have the right to be an index of refraction. A number less than " 1 " can"t be . . . That would certainly be saying the the rate of light in this substance is better than the speed of irradiate in vacuum.

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A cd player has actually a present of 0.1 a flowing with it. If the source voltage is 4v, what is the resistance? R=V/I

Given parameters:

Current the CD player = 0.1A

Source Voltage = 4V


Resistance = ?


Based top top Ohm"s law;

V = ns R;

V = voltage

i = existing

R = resistance

input the parameters and solve;

4 = 0.1 x R

R =

= 40ohms

The resistance of the CD player is 40ohms

Neutron star density. A common neutron star has a mass of around 1.5m☉ and a radius of 10 kilometers. Calculate the mean dens
(a) One solar massive is same to 
, so the mass of the neutron star is 1.5 time this value:
The radius that the star is 
, for this reason its volume is
So, the density of the ghost star is
(b) We want to find the fixed of 1 cm^3 of ghost star. The volume is
so, by using the density we found at point (a), we can calculate the mass of 1 cm^3 of spirit star:
So, 1 cm^3 of ghost star has more mass than Mt Everest (whose massive is 

The nebular theory likewise predicts that the cloud should heat up together it collapses. What physical law defines why that heats up?
The physical law that describes that is the law of conservation of energy which says that he power of an secluded sistem continues to be constant

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Flywheels room large, substantial wheels used to save energy. They deserve to be be crazy up slowly, climate the wheels energy can be released qui

176.99113 seconds

555165.24756 J


d = Diameter the wheel = 1.5 m

r = Radius =


m = fixed of wheel = 250 kg

= torque = 50 Nm

= Angular rate = 1200 rpm

Moment the inertia is provided by


Angular acceleration is provided by


Time take away is provided by


The time the takes for the flywheel come reach peak angular rate is 176.99113 seconds