A car traveled 30 km in 20 minutes. What is its average speed?

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.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

Which of the following is the best name for mgcl2