If a boy (m = 25 kg) at rest on skates is pushed by another boy who exerts a force of 500 n on him and if the first boy's final velocity is 20 m/s, what was the contact time?

What is the length x of the side of the triangle below? (hint: use the cosine function)

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

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.