What do peculiar velocities reveal?

A) the amount of dark matter in a galaxy
B) the distribution of dark matter in large-scale structures
C) the composition of dark matter
D) the error in our observations of Hubble's law
E) the critical density of the universe

B

Physics & Space Science

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Which of the following statements is incorrect?

A.

Capacitance is always positive.

B.
The symbol for potential difference between the plates of a capacitor is .

C.
Water is a polar molecule.

D.
When a dielectric is placed in a capacitor it serves to reduce the electric field.

E.
Nonpolar molecules cannot be used for dielectric material in a capacitor.

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Physics & Space Science

A long straight wire (diameter = 2.0 mm) carries a current of 40 A. What is the magnitude of the magnetic field 1.5 mm from the axis of the wire?

A. 3.0 mT B. 12 mT C. 5.3 mT D. 7.4 mT E. 8.0 mT

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Physics & Space Science

The solar corona is shown as white lines streaming from the Sun and you are viewing it from Earth. Which eclipse are you observing?

image

a. annular eclipse b. total solar eclipse c. total lunar eclipse d. partial solar eclipse

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Physics & Space Science

A tube open at one end and closed at the other end produces sound having a fundamental frequency of 350 Hz. If you now open the closed end, the fundamental frequency becomes

A) 87.5 Hz. B) 175 Hz. C) 350 Hz. D) 700 Hz. E) 1400 Hz.

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Physics & Space Science