The wind-chill index is modeled by the function w = 13.12 + 0.6215t â’ 11.37v0.16 + 0.3965tv0.16 where t is the temperature (â°c) and v is the wind speed (km/h). when t = â’19â°c and v = 25 km/h, by how much would you expect the apparent temperature w to drop if the actual temperature decreases by 1â°c? (round your answers to two decimal places

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?