A barefoot field-goal kicker imparts a speed of 30 m/s to a football at rest. If the football has a mass of 0.50 kg and time of contact with the football is 0.020 s, what is the force exerted on the foot?
a. 190 N
c. 600 N
b. 380 N
d. 750 N
D
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A metal rod of length L moves with velocity v, perpendicular to its length, in a magnetic field B, which is perpendicular to both the rod and its velocity. If the length of the rod is doubled, what happens to the electric field in the rod?
A. it stays the same B. it doubles C. it quadruples D. it halves E. it quarters
Which of the following statements is true of a bipolar flow?
A) It represents jets flowing in opposite directions away from a central object. B) It is similar to that of laminar and transient flows. C) It is not associated with Herbig-Haro objects. D) It is not associated with the asymptotic giant branch stars.
When we speak of the large-scale structure of the universe, we mean ________
A) the structure of any large galaxy B) the overall shape of the observable universe C) the overall arrangement of galaxies, clusters of galaxies, and superclusters in the universe D) the structure of any individual cluster of galaxies
If Q = 25 ?C, q = 10 ?C, and L = 40 cm in the figure, what is the magnitude of the electrostatic force on q?
a.
28 N
b.
22 N
c.
20 N
d.
14 N
e.
10 N