Projectile Motion: At a location where g = 9.80 m/s2, a projectile returns to its original height after 4.08 seconds, during which time it travels 76.2 meters horizontally. If air resistance can be neglected, what was the projectile's initial speed?
Fill in the blank(s) with the appropriate word(s).
27.4 m/s
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Three identical charges of 3.0 ?C are placed at the vertices of an equilateral triangle which measures 30 cm on a side. What is the magnitude of the electrostatic force which acts on any one of the charges?
A) 1.6 N B) 1.8 N C) 2.0 N D) 2.2 N E) 2.4 N
A 5.0-N projectile leaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise if there was no air resistance?
A) 44 m B) 24 m C) 20 m D) 10 m E) It is impossible to determine the height without knowing the angle of launch.
If Star A is twice as far as Star B, and they are identical in all other ways, then the brightness of Star A would be
A. the same brightness as Star B. B. twice the brightness of Star B. C. one-fourth the brightness of Star B. D. four times the brightness of Star B. E. one-half the brightness of Star B.
A series circuit consists of ac source, a 90-? resistor, a 0.80-H inductor, and an 80-?F capacitor. The frequency of the source is adjusted so that the capacitive reactance is equal to twice the inductive reactance
What is the frequency of the source? A) 13 Hz B) 14 Hz C) 17 Hz D) 19 Hz E) 16 Hz