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 z axis?
a. 275 kg•m2
c. 250 kg•m2
b. 90 kg•m2
d. 180 kg•m2
A
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A rectangular loop of wire measures 1.0 m by 1.0 cm. If a 7.0-A current flows through the wire, what is the magnitude of the magnetic force on the centermost 1.0-cm segment of the 1.0-m side of the loop? (?0 = 4? × 10-7 T ? m/A)
A) 4.9 × 10-6 N B) 9.8 × 10-8 N C) 9.8 × 10-6 N D) 7.8 × 10-7 N
What is the Celestial Equator?
A. a band of constellations through which the planets and Sun appear to move B. the cycle of lunar phases C. the line that the Sun traces across the celestial sphere D. an imaginary line in the sky, directly above Earth's equator
The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
A. D. B. E. C. F. D. G. E. H.
One light-year is the distance light travels in one year. The speed of light is about 300,000 km/s . How far is 1 light-year?
A) 1.08 billion km (1,080,000,000, or 1.08 × 109 km) B) 300 thousand km (300,000, or 3 × 105 km) C) 9.46 trillion km (9,460,000,000,000, or 9.46 × 1012 km) D) 18 million km (18,000,000, or 1.8 × 107 km)