1. (10 points) In a science project, you plan to apply the knowledge of PHYS 212 to construct a generator and transformer to power your laptop. Suppose you will make use of the Earth’s magnetic field. Assume it has a strength of 0.040 T at your location. Your generator design calls for a coil of 5000 windings rotated at exactly 120 Hz. The coil is oriented so that the normal to the area lines up with the Earth’s field at the end of each cycle. (a) Find out the coil diameter in order to generate a maximum voltage of 170 V (required in order to average 120 V). (4 points) (b) Design a transformer that allows you to use the "electricity" from your generator to power up your laptop. Your laptop requires a voltage of about 15 V. Specify clearly the turn ratio between primary and secondary coils. Draw a schematic plot of the windings. (6 points)
Answers: 3
Physics, 22.06.2019 00:10
The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?
Answers: 3
Physics, 22.06.2019 05:50
Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.
Answers: 2
1. (10 points) In a science project, you plan to apply the knowledge of PHYS 212 to construct a gene...
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