I can fly but have no wings. I can cry but I have no eyes. Wherever I go, darkness follows me. What am I?

Aforce of 100 newtons is used to move an object a distance of 15 meters with a power of 50 watts. find the work dine and the time it takes to do the work

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

Ajoint produces movement when its angle decreases. which type of movement is it?