, 07.11.2019 18:31, reghanhoward3

# Mitchell records the amount of time a toy car takes to travel down a ramp...

Mitchell records the amount of time a toy car takes to travel down a ramp one time for each of four slope angles. his lab partner, sarah, suggests that he run the same set of trials two more times. what arguments should sarah use to support her suggestion? check all that apply. more trials will prove the results. more trials will reduce mistakes. more trials will guarantee correct results. more trials will increase confidence in the results. more trials will identify other possible solutions.

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Physics, 21.06.2019 22:20, lunamoon1
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Acommon procedure for measuring the velocity of an airstream involves the insertion of an electrically heated wire (called a krwzluh dqhprphwhu) 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 / 20 mm and diameter ' 0.5 mm, for which a calibration of the form 9 6.25 105 k2 has been determined. the velocity 9 and the convection coefficient k have units of m/s and w/m2 k, respectively. in an application involving air at a temperature of 7 25c, the surface temperature of the anemometer is maintained at 7v 75c with a voltage drop of 5 v and an electric current of 0.1 a. what is the velocity of the air?