A soap bubble hovers motionlessly in the air. If the soap bubble's mass, including the air inside it, is 1.05 ✕ 10−4 kg determine the magnitude of the upward force acting on it.

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.

This is the number of complete movements of a wave per second.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?