According to astronomers, the Milky Way is _____
A) wheel shaped
B) hexagonal
C) rectangular
D) bell shaped
A
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Why does the average chemical composition of stars now forming differ from that of older stars?
What will be an ideal response?
The intensity of a sound wave is directly proportional to
A. the frequency. B. the amplitude. C. the square of the amplitude. D. the square of the speed of sound. E. none of these answers are correct
An ideal air-filled parallel-plate capacitor consists of plates that are 1.0 mm apart and have an area of 1.5 × 10-4 m2
The capacitor is connected to a 12-V potential source (battery). (?0 = 8.85 × 10-12 C2/N ? m2) (a) What is the capacitance of this capacitor? (b) How much charge is on each of its plates? (c) What is the strength of the electric field between the plates?
A solenoid with n1 = 1200 turns/m and a current I1 = 2.5 A is filled with a paramagnetic material at a temperature T1 = 320 K
A second solenoid with n2 = 1000 turns/m and a current I2 = 0.85 A is filled with the same paramagnetic material at a different temperature T2. The magnetizations are the same in both cases. What is the value of T2? A) 256 K B) 150 K C) 67 K D) 91 K E) 201 K