A circular loop of wire of cross-sectional area 0.12 m2 consists of 200 turns, each carrying 0.50 A. It is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop. What torque acts on the loop?
A)
0.25 m?N
B)
0.52 m?N
C)
2.5 m?N
D)
5.2 m?N
E)
25 m?N
B
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Carbon-14 Dating: Carbon-14 decays by ?- emission. What nucleus is left after this decay?
A. carbon-13 B. carbon-14 C. carbon-15 D. nitrogen-14 E. nitrogen-15
Weight and g: In another solar system, a planet has an airless moon Zygo that is 4.0 × 105 m in diameter. Experiments reveal that a freely falling object at the surface of Zygo accelerates at 0.20 m/s2. What is the mass of Zygo? (G = 6.67 × 10-11 N ? m2/kg2)
A. 2.4 × 1019 kg B. 4.8 × 1019 kg C. 1.2 × 1020 kg D. 2.4 × 1020 kg E. 4.8 × 1020 kg
First Law of Thermodynamics: An expandable container holds 2.30 mole of helium, He, gas with an initial pressure of 770 kPa and an initial volume of 2.10 L. The gas expands isothermally to a final pressure of 350 kPa. How much heat is gained by the gas during this process? (R = 8.31 J/mol ? K)
A. 1280 J B. 792 J C. 685 J D. 1370 J E. 1700 J
Neglecting friction, a small and a large block of ice begin sliding down an incline together. The larger block reaches the bottom
A) before the small block. B) after the small block. C) at the same time as the small block.