De Exercise 3
(Take g = 10 ms
1 A ball is projected horizontally from the top of a
hill with a velocity of 30 ms. If it reaches the
ground 5 seconds later, the height of the 11
IS:
A 200 m B. 125 m C 250 m
D 100 m E 65 m

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.

Which property is expressed in distance units? o a. period o b. wavelength o c. speed o d. frequency

Which of these best describes the term ecliptic? a. the circle where "earth meets the sky" b. the change in azimuth and altitude of an object c. the point directly above the geographic north pole d. the path of the sun through the constellations of the zodiac