Which diagram correctly shows the magnetic field lines created by a circular current loop in which current flows in the direction shown?
a.
b.
c
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Why was the recent discovery that planets more massive than Jupiter orbit nearby stars in small orbits surprising?
A. The nebular hypothesis predicts that close-in planets should have formed a second star. B. Because according to the nebular hypothesis, massive planets should only form away from their star. C. The density of these planets is very high. D. According to the nebular hypothesis, planets cannot be larger than Jupiter.
Two thin 80.0-cm rods are oriented at right angles to each other. Each rod has one end at the origin of the coordinates, and one of them extends along the +x-axis while the other extends along the +y-axis
The rod along the +x-axis carries a charge of -15.0 µC distributed uniformly along its length, and the other rod carries +15.0 µC uniformly over its length. Find the magnitude and direction of the net electrical force that these two rods exert on an electron located at the point (40.0 cm, 40.0 cm). (e = 1.60 × 10-19 C, ?0 = 8.85 × 10-12 C2/N • m2)
In many cartoon shows, a character runs off a cliff, realizes his predicament, and lets out a scream. He continues to scream as he falls
If the physical situation is portrayed correctly, from the vantage point of an observer at the top of the cliff leaning over the edge, the pitch of the scream as he falls should be A) lower than the original pitch and constant. B) higher than the original pitch and increasing as he falls. C) higher than the original pitch and constant. D) lower than the original pitch and decreasing as he falls. E) It is impossible to predict.
Nitrogen fixation and runoff of nitrogen applied to the soil pose problems for agricultural production and the environment. Why is this so? Explain
What will be an ideal response?