A star has right ascension of 3 hours. Which of these statements is correct about the star? A. It is 3 hours north of the celestial equator.
B. It is 3 hours south of the celestial equator.
C. It is 3 hours to the east of zero hours right ascension.
D. It is 3 hours to the west of zero hours right ascension.

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.