The power in a circuit is 2W and the voltage is 20VDC. Whats the curcuit current?

What are atoms of the same element with varying number of neutrons

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.