4. An object located 20 cm away from a converging lens produces a focused image 15 cm away from the lens on the other side of the lens. (4)
(a) What is the magnification of this lens system?
(b) What kind of image is produced (real or virtual)?
(c)
Is the image upright or inverted?

The 20@kg wheel has a radius of gyration about its center g of kg = 300 mm. when it is subjected to a couple moment of m = 50 n # m, it rolls without slipping. determine the angular velocity of the wheel after its mass center g has traveled through a distance of sg = 20 m, starting from rest.

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.