Acapacitor with an initial potential difference of 185 v is discharged through a resistor when a switch between them is closed at t = 0 s. at t = 10.0 s, the potential difference across the capacitor is 1.64 v. (a) what is the time constant of the circuit? (b) what is the potential difference across the capacitor at t = 18.8 s?

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s