If two slide projectors are connected in parallel across the same 120 volt source, the current drawn from the source in amperes is
a. 3
b. 6
c. 9
d. 12
e. none of the above
D
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A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
A. ?0.64 kJ B. ?0.40 kJ C. ?0.52 kJ D. ?0.28 kJ E. ?0.76 kJ
Six seconds after starting from rest, a freely-falling baseball has a speed of
A) 10 m/s. B) 30 m/s. C) 60 m/s. D) 70 m/s.
What is the impedance of an AC series circuit that is constructed of a 12.5-? resistor along with 13.6-? inductive reactance and 3.43-? capacitive reactance?
a. 29.5 ? b. 22.7 ? c. 18.2 ? d. 16.1 ? e. 3.36 ?
The temperature scale where the numerical value is proportional to the average kinetic energy of the atoms or molecules is
a. Fahrenheit. b. Celsius. c. Kelvin. d. none of the above.