In a ionic liquid, electric currents are carried by both positive and negative ions. an electric field is set up in a cylinder of cross-sectional area a. positive ions drift to the right with speed v1 and negative charges drift to the left with speed v2. the liquid is neutral so the density of positive and negative charge carriers are both equal to n. the positive ions have charge +e and the negative ions have charge -e. what is the current? (a) i = enavi + enav2 to the right (b) i = enavi + en av2 to the left (c) i = enav1 - enav2 to the right (d) i = enav1- en av2 to the left

Aprojectile is launched horizontally 10m above the ground and with an initial velocity of 15 m/s. a) sketch the trajectory using an appropriate coordination system. b) how long for the projectile to reach the ground. c) how far did projectile travel horizontally before striking the ground. d) determine the projectilex & y position at t-1.3s e) determine the magnitude and direction of projectile velocity at t= 1.3s f) determine the magnitude and direction of projectile acceleration at t-1.3s

The second largest public utility in the nation is the sole provider of electricity in 32 counties of southern florida. to meet the monthly demand for electricity in these counties, which is given by the inverse demand function p = 1,200 – 4q, the utility company has set up two electric generating facilities: q1 kilowatts are produced at facility 1, and q2 kilowatts are produced at facility 2 (so q = q1 + q2). the costs of producing electricity at each facility are given by c1(q1) = 8,000 + 6q12 and c2(q2) = 6,000 + 3q22, respectively. determine the profit-maximizing amounts of electricity to produce at the two facilities, the optimal price, and the utility company’s profit

Agirl throws a ball. if the ball's acceleration is 12 m/sec/sec and its mass is 0.5 kg, how much force did the girl apply to the ball?