Parallel Wires: Two long parallel wires separated by 7.5 cm each carry 3.3 A in opposite directions. (?0 = 4? × 10-7 T ? m/A)(a) What magnetic force per length acts on each of the wires? Is it attractive or repulsive?(b) Find the magnitude of the magnetic field midway between the two wires.
What will be an ideal response?
(a) 2.9 × 10-5 N/m, repulsive (b) 3.5 × 10-5 T
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If you were to take a voyage through the entire disk of the Milky Way, what kind of material would you spend most of your time in?
A) empty space-a pure vacuum B) rarefied clouds of atomic hydrogen C) star clusters D) hot bubbles of ionized hydrogen E) cool, dense clouds of molecular hydrogen
The study of the oscillations of the surface and interior of the Sun is known as ____________________
Fill in the blank(s) with correct word
What is a helium flash?
A) It is the sudden onset of helium fusion in the core of a low-mass star. B) It is the ignition of helium shell fusion in a high-mass star with a carbon core. C) It is a sudden brightening of a low-mass star, detectable from Earth by observing spectral lines of helium. D) It is another name for the helium fusion reaction.
A projectile is launched with an initial velocity of 80 m/s at 30° above the horizontal. Neglecting air, what is horizontal component of the projectile's acceleration?
A) 80 m/s2 B) 40 m/s2 C) 9.8 m/s2 D) 0 m/s2 E) 69 m/s2