If the sum total mass of reactants in a nuclear reaction is less than that of product particles, then which of the following statements best describes the conditions of the reaction?
a. reaction releases energy
b. reaction absorbs energy
c. atomic number of each reactant must be less than 80
d. atomic number of each reactant must be greater than 40
B
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Three boxes in contact rest side-by-side on a smooth, horizontal floor
Their masses are 5.0-kg, 3.0-kg, and 2.0-kg, with the 3.0-kg box in the center. A force of 50 N pushes on the 5.0-kg box, which pushes against the other two boxes. (a) Draw the free-body diagrams for each of the boxes. (b) What magnitude force does the 3.0-kg box exert on the 5.0-kg box? (c) What magnitude force does the 3.0-kg box exert on the 2.0-kg box?
A pair of action-reaction forces always
A) act on the same object. B) occur simultaneously. C) comprise a pair of interactions. D) all of the above E) none of the above
Metric System: The number 0.00325 × 10-8 cm can be expressed in millimeters as
A. 3.25 × 10-12 mm. B. 3.25 × 10-11 mm. C. 3.25 × 10-10 mm. D. 3.25 × 10-9 mm.
When the Martian axis tilt is large, the Martian poles
A) expand and remain permanently frozen, thinning the atmosphere B) contract and partially vaporize, thickening the atmosphere C) extend over the entire surface of the planet D) completely disappear