Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. A light ray that reflects from mirror 1 at angle qM1 then strikes the second mirror and reflects at qM2 such that the angle between the ray reaching mirror 1 and the ray leaving mirror 2 is 180°. The angle between the two mirrors is
a. 0°.
b. 45°.
c. 90°.
d. 150°.
e. 235°.
C
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An automobile moving along a straight track changes its velocity from 40 m/s to 80 m/s in a distance of 200 m. What is the (constant) acceleration of the vehicle during this time?
A. 8.0 m/s B. 9.6 m/s C. 12 m/s D. 6.9 m/s E. 0.20 m/s
In which type of radioactive decay does the atomic number of the parent nucleus change?
A) the atomic number changes in all three types of decay B) electron capture C) beta decay D) alpha decay
What fraction of a radioactive sample has decayed after two half-lives have elapsed?
1.1/8 2.3/4 3.7/8 4.none of these
Energy in the Electric Field: A parallel-plate air-filled capacitor is made from two plates that are 0.070 m on each side and spaced 9.2 mm apart. What must the potential difference between the plates be to produce an energy density of 0.062 J/m3 in the region between them? (?0 = 8.85 × 10-12 C2/N ? m2)
Fill in the blank(s) with the appropriate word(s).