While cruising along the highway, you pause to think about how you know from phy
ID: 1514014 • Letter: W
Question
While cruising along the highway, you pause to think about how you know from physics class that your car's alternator is generating voltage that will be used to re-charge your battery. If the alternator is producing 90 V of AC (rms) and feeding it into the transformer which steps the voltage down to 12 V (rms), how many turns must the primary coil have if the secondary coil has 50 turns? 2. Young stars in galaxies heat the dust and gas around them, and a lot of the heat "escapes" through an emission line of ionized carbon. A photon of infrared emission from this ionized carbon has a wavelength of 158 mum. What is the energy (in Joules) associated with a single photon of this type? 3. In the song "King of Pain," Sting sings the line There's a dead salmon frozen in a waterfall... You look into a block of ice and see a salmon at an angle of of 38degree. Find the actual angle between the salmon and the sheet of ice if the index of refraction in ice is n_ice = 1.31 and that in air is n_air = 1.00. 4. A person is standing beside a canal that is 3.0 m deep and 3.0 m wide. They can just see the bottom at the far edge. If the canal were drained of its water, how much closer to the edge must the person be in order to still see the bottom at the far edge? The person's eye level is a height of 1.75 m above the ground, and the index of refraction of the water is 1.333 (and that of the air is 1.000).Explanation / Answer
for transformers:
V2/V1 = n2/n1
V2 = voltage of secondary coil
n2 = number of turns in secondary coil
n1 = n2*V1/V2
n2 = 50 turns
V1 = 90 V
V2 = 12 V
n1 = 50*90/12
n1 = 375 turns
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