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

Physics & Space Science

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Which space mission orbited Saturn and dropped a probe into Saturn's atmosphere?

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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

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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?

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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.

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