When a container of water is placed on a laboratory scale, the scale reads 120 g. Now a 20-g piece of copper (of density 8.9 g/cm3 ) is suspended from a thread and lowered into the water, not touching the bottom of the container
What will the scale now read? The density of water is 1.0 g/cm3. A) 120 g
B) 122 g
C) 138 g
D) 140 g
B
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Indicate whether the statement is true or false
Organisms far from each other on the "Tree of Life"
A) are genetically very similar B) are genetically very different C) look very similar to the eye D) are genetically identical
Radium (A = 88) transmutes to radon (A = 86) by
A) beta emission. B) alpha emission. C) gamma emission. D) none of the above
An amateur astronomer grinds a double convex lens whose surfaces have radii of curvature of 40 cm and 60 cm. The glass has an index of refraction of 1.54. What is the focal length of this lens in air?
A) 42.5 cm B) 126 cm C) 88.8 cm D) 44.4 cm E) 222 cm