A man whose mass is 60 kg walks up 15 steps, each 30cm high, in 15s. Find the power he develops.

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

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.

As the distance from a magnet increases, what happens to the magnet force?