If y = 0.02 sin (30x? 400t) (SI units) and if the mass density of the string on which the wave propagates is 0.005 kg/m, then the transmitted power is
A. 1.03 W.
B. 2.13 W.
C. 4.84 W.
D. 5.54 W.
E. 106 W.
Answer: B
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A torque of 15.0 N•m is applied to a bolt. The bolt rotates through an angle of 360 degrees. The work done in turning the bolt is
A. 94.2 J. B. 91.3 J. C. 96.7 J. D. 89.9 J. E. 98.1 J.
Which of the following increases the magnetic moment of a rectangular coil the most?
1.doubling the coil's current and its number of turns 2.doubling the coil's area and doubling the magnetic field in which the loop is placed 3.doubling the magnetic field in which the coil is placed and doubling the angle between the magnetic field and the plane of the loop 4.All of these choices increase the magnetic moment by a factor of 4, thus they are all the "most".
In a mass-energy census of the universe, what are the approximate proportions of normal matter, dark matter, and dark energy?
A) 68% dark matter, 27% dark energy, 5% normal matter B) mostly normal matter, with only trace amounts of dark matter and dark energy C) 27% dark matter, 68% dark energy, 5% normal matter D) 33% dark matter, 33% dark energy, 33% normal matter
A 10. kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. The spring constant is
A) 5.0 N/cm B) 49 N/cm C) 0.20 N/cm D) 20. N/m E) 0.0020 N/cm