One long wire carries a current of 30 A along the entire x axis. A second long wire carries a current of 40 A perpendicular to the xy plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the point y = 2.0 m on the y axis?
A. 4.0 ?T
B. 5.0 ?T
C. 3.0 ?T
D. 7.0 ?T
E. 1.0 ?T
Answer: B
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Mass on a Spring: A mass on a spring undergoes SHM. When the mass passes through the equilibrium position, which of the following statements about it are true? (There could be more than one correct choice.)
A. Its acceleration is zero. B. Its speed is zero. C. Its elastic potential energy is zero. D. Its kinetic energy is a maximum. E. Its total mechanical energy is zero.
Design a composite material made of epoxy and uniaxial E-glass fibers that has an axial thermal conductivity of 8 Wm-1 K-1 . The thermal conductivity of E-glass is 13 Wm-1 K-1 , and for epoxy it is 0.1 Wm-1 K-1 .
(a) What is the volume fraction of fibers and matrix in this composite? (b) What is the transverse thermal conductivity of this material?
What does chromatic aberration separate within refracting telescopes?
a. color b. lenses c. images d. photons e. focal points
Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, one second later the rock's speed is
A) zero. B) 5 m/s. C) 10 m/s. D) 15 m/s. E) none of the above