Physics, 31.07.2019 17:30 josephdakota
An athlete prepares to throw a 2.0-kilogram discus. his arm is 0.75 meters long. he spins around several times with the discus at the end of his out-stretched arm so that the discus reaches a velocity of 5.0 m/s. what is the centripetal force acting on the discus? a.9.4 n b.14 n c.27 n d.66 n
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Acommon procedure for measuring the velocity of an airstream involves the insertion of an electrically heated wire (called a hot-wire anemometer) into the airflow, with the axis of the wire oriented perpendicular to the flow direction. the electrical energy dissipated in the wire is assumed to be transferred to the air by forced convection. hence, for a prescribed electrical power, the temperature of the wire depends on the convection coefficient, which, in turn, depends on the velocity of the air. consider a wire of length l = 20 mm and diameter d = 0.5 mm, for which a calibration of the form v = 6.25 Äā 10Ć¢ā5 h2 has been determined. the velocity v and the convection coefficient h have units of m/s and w/m2 Ć¢ā¹ā¦ k, respectively. in an application involving air at a temperature of tĆ¢Å¾ = 25Ć¢Ā°c, the surface temperature of the anemometer is maintained at ts = 75Ć¢Ā°c with a voltage drop of 5 v and an electric current of 0.1 a. what is the velocity of the air?
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An athlete prepares to throw a 2.0-kilogram discus. his arm is 0.75 meters long. he spins around sev...
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