Light travels at a speed of 186,000 miles a second. The distance light travels in a year is: 58,656,950,000,000 miles/year
8,865,690,000,000 miles/year
6,789,000,000 miles/year
5,865,696,000,000 miles/year

Is the alien theory a scientific claim? why or why not? just took the test it was , : " the alien theory is not a scientific claim because it is not based on valid data, there is no evidence to support it, and it does not come from a reliable source."

The consumption of fossil fuels could be

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.