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Physics, 21.06.2019 17:20
Your 249 ml cup of coffee is too hot to drink when served at 82 degree celsius. what is the mass of an ice cube taken from a -21 degree celsius freezer, that will cool your coffee to a pleasant 54 degree celsius. specific heat of the water is 4190 j/kg c, specific heat of ice is 2090 j/kg c, heat of fusion of ice is 3.33 x 10^5 j/kg
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What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?
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Physics, 22.06.2019 15:00
Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14ฯฯต0. d)the ball will oscillate along the z axis between z=d and z=โd in simple harmonic motion. what will be the angular frequency ฯ of these oscillations? use the approximation dโชa to simplify your calculation; that is, assume that d2+a2โa2. express your answer in terms of given charges, dimensions, and constants
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Physics, 22.06.2019 17:30
Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3ร106n/c of the field causes a spark.
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