What is the phase angle of an AC series circuit that is constructed of a 14.5-? resistor along with 16.5-? inductive reactance and 9.41-? capacitive reactance?
a. 26.1°
b. 11.9°
c. 43.1°
d. 35.0°
e. 38.7°
a
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Identical point charges Q are placed at each of the four corners of a 3.0-m × 4.0-m rectangle. If Q = 40 ?C, what is the magnitude of the electrostatic force on any one of the charges?
A. 3.0 N B. 2.4 N C. 1.8 N D. 3.7 N E. 2.0 N
What is the total translational kinetic energy in a test chamber filled with nitrogen (N2 ) at 2.16 × 105 Pa and 20.7°C?
The dimensions of the chamber are 4.00 m × 5.70 m × 7.40 m. The ATOMIC weight of nitrogen is 28.0 g/mol, Avogadro's number is 6.022 × 1023 molecules/mol and the Boltzmann constant is 1.38 × 10-23 J/K.
Climate models support the claim that human activity is causing the currently observed global warming because
A) the models can perfectly predict all aspects of today's climate. B) climate models that include contributions by human activity agree much better with actual data than models that consider only natural factors. C) the models are very sophisticated, with thousands of equations, and this gives scientists confidence that the models must be correct. D) the models predict that warming will continue in the future.
A 4.0-kg mass is placed at (3.0, 4.0) m, and a 7.0-kg mass is placed at (3.0, -4.0) m. What is the moment of inertia of this system of masses about the x axis?
a. 275 kg•m2
b. 90 kg•m2
c. 176 kg•m2
d. 99 kg•m2