A train is traveling due south at a constant
velocity of 86 mi/h. Any unbalanced force
acting on the train with respect to the Earth’s
surface must be
a)zero.
b)directed vertically upward.
c)directed toward the south.
d)directed vertically downward.
a
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Radiation Activity: 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 × 1010 Bq)
A. 5.8 × 109 nuclei B. 8.5 × 108 nuclei C. 6.3 × 108 nuclei D. 3.2 × 109 nuclei E. 2.4 × 109 nuclei
Water flows through a pipe. The diameter of the pipe at point B is larger than at point A. Where is the water pressure greatest?
A) at point A B) at point B C) It is the same at both A and B.
A projectile is fired from ground level with an initial speed of 55.6 m/s at an angle of 41.2° above the horizontal. Neglect air, take upward as the positive direction, and use g = 9.8 m/s2
(a) Determine the time necessary for the projectile to reach its maximum height. (b) Determine the maximum height reached by the projectile. (c) Determine the horizontal and vertical components of the velocity vector at the maximum height. (d) Determine the horizontal and vertical components of the acceleration vector at the maximum height.
During ester formation, the –OH is removed from the
a. carboxylic acid. b. amine. c. alcohol. d. sugar.