A flat square coil of wire measures 9.5 cm on each side and contains 175 turns of very thin wire. It carries a current of 6.3 A in a uniform 0.84-T magnetic field
What angle less than 90° should the plane of this coil make with the magnetic field direction so that the magnitude of the magnetic torque on it is 6.5 N ? m?
39°
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Study this graph, focusing on the red curve and reddish horizontal swath. Which statement correctly interprets what the graph shows?
A) The measured abundance of deuterium agrees with the theoretically predicted abundance only if we make the prediction with a model of the universe in which ordinary matter makes up about 5% of the critical density. B) The abundance of deuterium in the universe has rapidly decreased with time. C) The actual abundance of deuterium in the universe has never changed, but the predicted abundance has decreased with time. D) The abundance of deuterium in the universe is high in galaxies near the Milky Way but much lower in galaxies that are much farther away.
After a star leaves the main sequence, ________.
A. all hydrogen in the star has been fused, and helium fusion begins B. it now fuses hydrogen into helium in a shell outside the core C. it continues to fuse hydrogen into helium in its core D. it no longer fuses hydrogen into helium anywhere inside the star
The radius of a star is 6.95 × 108 m, and its rate of radiation has been measured to be 5.32 × 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of this star? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 6.27 × 103 K B) 8.25 × 103 K C) 5.78 × 107 K D) 3.93 × 107 K E) 8.87 × 103 K
Asteroids which could possibly collide with the Earth at some time in the future are known as
A) killer asteroids B) Earth-crossing asteroids C) Armageddon asteroids D) potentially hazardous asteroids