The energy source at the center of our galaxy is called
a. Cygnus X-1.
b. the Orion arm.
c. the Sun.
d. Sagittarius A.
.D
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What should the height of a slide in a park be so that a child will reach the bottom of the slide with a speed of 15.0 m/s? Use g = 10.0 m/s2
A) 22.5 m B) 15.1 m C) 11.3 m D) 10.5 m E) 0.75 m
A transformer is to be designed to increase the 27-kV (rms) output of a generator to the transmission line voltage of 346 kV (rms). If the primary winding has 95 turns, how many turns must the secondary have?
a. 7 b. 15600 c. 1217 d. 26 e. 4358
A 0.40-kg mass, attached to the end of a 0.75-m string, is whirled around in a circular horizontal path. If the maximum tension that the string can withstand is 400 N, then what maximum speed can the mass have if the string is not to break?
a. 370 m/s c. 19 m/s b. 27 m/s d. 29 m/s