A rock is thrown downward from an unknown height above the ground with an initial speed of 10 m/s. It strikes the ground 3.0 s later. Determine the initial height of the rock above the ground.
A. 44 m
B. 14 m
C. 74 m
D. 30 m
E. 60 m
Answer: C
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An archaeologist finds the 14C in a sample of 3.10 g of material to be decaying at 107 counts per second. A modern 1.00-g sample of the same material decays at 151 counts per second. The half-life of 14C is 5730 y. How old is the sample?
A) 12,200 y B) 8460 y C) 25,100 y D) 12,600 y
The net direction in which electrons flow through a circuit is:
A) the direction of the conventional current. B) opposite of the direction of the conventional current.
The common element discovered in the Sun's spectrum before it was found here is ________
Fill in the blank(s) with correct word
The velocity of a particle moving along the x axis is given for t > 0 by vx = (32.0t ? 2.00t3) m/s, where t is in s. What is the acceleration of the particle when (after t = 0) it achieves its maximum displacement in the positive x direction?
a. ?64.0 m/s2 b. zero c. 128 m/s2 d. 32.0 m/s2 e. ?32.0 m/s2