Cho mạch điện như hình vẽ. Biết Umn=18V cường độ dòng điện qua R2 là I2=2A. Tìm a) R1 nếu R2=6 ôm, R3= 3 ôm

b) R3 nếu R1= 3 ôm R2=1 ôm

c) R2 nếu R1=5 ôm, R3= 3 ôm

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.

In the united states, tornadoes generally occur because of the freezing of ocean water underwater earthquakes meeting of cool and warm air masses shifting of warm and cool ocean currents