What current must be maintained in a square loop (50 cm on a side) to create a torque of 1.0 N / m about an axis through its center and parallel to one of its sides when a magnetic field of magnitude 70 mT is directed at 40° to the plane of the loop?
a. 66 A
b. 89 A
c. 61 A
d. 75 A
e. 37 A
d
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Two particles (m1 = 0.20 kg, m2 = 0.30 kg) are positioned at the ends of a 2.0-m long rod of negligible mass. What is the rotational inertia of this rigid body about an axis perpendicular to the rod and through the center of mass?
a. 0.48 kg/m2 b. 0.50 kg/m2 c. 1.2 kg/m2 d. 0.80 kg/m2 e. 0.70 kg/m2
What is "excluded" by the Pauli exclusion principle?
a. certain values of angular momentum b. precise values of both position and momentum c. electrons in the same quantum state d. none of the above
The hydrogen Balmer line H? has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the fractional change in wavelength or redshift z of this quasar?
a. 5 b. 0.5 c. 0.25 d. 4 e. 1944.4
A 3.0 kg object is moving to the right at 4.0 m/s. It collides in a perfectly inelastic collision with a 6.0 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?
A. 62 J B. 25 J C. 12 J D. 0.0 J