A pendulum has a mass of 0.5kg and starts at a height of 0.3 m. If it is released from rest, how fast is it going when it reaches the lowest point of its path? Acceleration due to gravity is g=9.8m ./s^2

In an experiment, how can i change human errors? be specific.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction