The core of a long solenoid with 1000 turns/m and a current of 0. 5 A is filled with an unknown material. It is found that the magnetic field along the axis of the solenoid increases by 0.0017%
What is the magnetic susceptibility of the unknown material? A)
1.7 × 10-5
B)
3.4 × 10-5
C)
0.0048
D)
-3.4 × 10-5
E)
0.0021
A
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Indicate whether the statement is true or false
In contrasting the distribution of the X-ray and gamma-ray bursts, we find:
A) gamma ray bursts are far closer to us, so they appear more luminous. B) gamma ray bursts are far beyond our Galaxy, at cosmological distances, and spread all over the sky, not in the plane of our Galaxy. C) gamma ray bursts are more closely associated with open than globular clusters. D) gamma ray bursts can repeat, while the X-ray bursts do not. E) gamma ray bursts can be observed from the ground, but X-rays are blocked by the ionosphere for ground based observers.
The results of statistical studies of the exoplanet systems discovered to date suggests that what proportion of stars are likely to have a planet less than half the size of the Earth and in an orbit within a star's habitable zone?
A) 10 to 20% B) 50% C) much less than 10% D) more than 90%
An auto moves at a steady 50 mph down a straight level road. The direction of the force of air resistance on the car is
A) forward. B) downward. C) backward. D) zero. E) sideways.