A straight wire of length L carries a current I in the positive z direction in a region where the magnetic field is uniform and specified by Bx = 3B, By = ?2B, and Bz = B, where B is a constant. What is the magnitude of the magnetic force on the wire?
A. 3.2 ILB
B. 5.0 ILB
C. 4.2 ILB
D. 3.6 ILB
E. 1.0 ILB
Answer: D
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Fill in the blank(s) with the appropriate word(s).
As of early 2013, the number of confirmed exoplanets found was:
A) 5, all around stars within 20 light years of us. B) 42, all much bigger than Jupiter, but orbiting red dwarf stars. C) over 400, orbiting more than 300 stars. D) about 900, mainly around stars much smaller and fainter than our Sun. E) thousands, around every star we have closely examined to date.
A person weighing 0.70 kN rides in an elevator that has an upward acceleration of 1.5 m/s2 . What is the magnitude of the force of the elevator floor on the person?
a. 0.11 kN b. 0.81 kN c. 0.70 kN d. 0.59 kN e. 0.64 kN
Air pressure is 1.00 × 10^5 N/m2, air density is 1.30 kg/m3, and the density of soft drinks is 1.00 × 10^3 kg/m3 . If one blows carefully across the top of a straw sticking up 0.10 m from the liquid in a soft drink can, it is possible to make the soft drink rise half way up the straw and stay there. How fast must the air be blown across the top of the straw?
a. 0.036 m/s b. 27 m/s c. 1.4 m/s d. 19 m/s e. 750 m/s