When adding several quantities, the number of decimal places in the result must always be
A) larger than the number of decimal places in the most accurate of the quantities.
B) equal to the number of decimal places in the most accurate of the quantities.
C) equal to the average number of significant digits in the most and least accurate of the quantities.
D) equal to the number of decimal places in the least accurate of the quantities.
E) smaller than the number of decimal places in the least accurate of the quantities.
D
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Rain or snow that falls on the continents is Earth's only
A) supply of water. B) supply of fresh water. C) hydrologic cycle. D) source of evaporation and condensation.
Steel blocks A and B, which have equal masses, are at TA = 300 °C and TB = 400 °C. Block C, with mC = 2mA, is at TC = 350 °C. Blocks A and B are placed in contact, isolated, and allowed to come into equilibrium. Then they are placed in contact with block C. At that instant,
a. TA = TB < TC. b. TA = TB = TC. c. TA = TB > TC. d. TA + TB = TC. e. TA ? TB = TC.
Ideal Gas Law: A sealed cylinder fitted with a movable piston contains ideal gas at 27°C, pressure 0.500 × 105 Pa, and volume 1.25 m3. What will be the final temperature if the gas is compressed to 0.800 m3 and the pressure rises to 0.820 × 105 Pa?
A. 42°C B. 68°C C. 130°C D. 250°C E. 150°C
Which of the following wavelengths could NOT be present as a harmonic on a 2 m long string?
a. 4 m b. 2 m c. 1 m d. 0.89 m e. 0.5 m