The equilibrium rule states that the vector sum of all forces acting on a
A) body at rest is zero.
B) body in uniform motion is zero.
C) non-accelerating body is zero.
D) all of the above
Answer: D
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A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 ?Ci? 1 Ci = 3.7 × Bq
A) 5.8 × 109 B) 8.5 × 108 C) 6.3 × 108 D) 3.2 × 109 E) 2.4 × 109
Uplift of the Rocky Mountains was a result of
A) compressional forces. B) tensional forces. C) crustal extension. D) none of these
Potential energy may be positive or negative
Indicate whether the statement is true or false
A ray of light is incident on the mid-point of a glass prism surface at an angle of 23.4° with the normal. For the glass, n = 1.60, and the prism apex angle is 51.8°. What is the angle of incidence at the glass-to-air surface on the side opposite where the ray exits the prism?
a. 39.5° b. 14.4° c. 37.4° d. 28.4° e. 42.7°