A boy plays solitary seesaw by placing the seesaw's fulcrum one-eighth the distance from where he sits at one end. Which weighs more?
A) the boy
B) the seesaw
C) they have equal weights
D) need more information
Answer: A
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Which space mission orbited Saturn and dropped a probe into Saturn's atmosphere?
a. Pioneer b. Voyager c. Galileo d. Cassini-Huygens e. New Horizons
A cylindrical tank is assembled by welding steel sections in a heli-cal pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The longitudinal strain in the the wall of the tank is approximately:
(A) 1.2 3 1024
(B) 2.4 3 1024
(C) 3.1 3 1024
(D) 4.3 3 1024
An old bone sample contains 321. grams of carbon and its activity is 947. decays/min. (5730. yr half life of Carbon-14)
(a) How many thousand years old is the sample? (b) What will be the activity of the sample 2000. yrs from now?
Atmospheric lifting resulting from the convergence of two different air masses is called
A) convectional lifting. B) orographic lifting. C) adiabatic lifting. D) frontal lifting.