Determine the atomic mass number of hydrogen
A molecule of water is composed of two atoms of hydrogen and one atom of oxygen (H20). If the atomic mass number of hydrogen is 1 and the molecular mass of water is 18, the atomicmass of oxyen must be
(a)36 (c) 18
(b)16 (d)14
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Find: a) the pitch diameter of the pinion. b) the pitch diameter of the gear. c) the output torque of the gear. d) the minimum length of the key used to attach the gear?
Calculate the pH of a solution prepared by mixing two solutions:3.00 L of a solution containing 84.0 g of NaF and 1.00 L of a 0.250M HF solution. (Ka of HF = 7.0 x 10-4)
Finally, the student turns and walks a distance of 25.1 meters in a direction of 22 degrees south of east in 30.3 seconds. what is the average velocity (direction and magnitude) of the student during his walking?
On a grid of 8 x 11, how many different ways are there to create a work of art filling each coordinate with either a C, M, P, or S where the C can be at brightness level 1, 2, or 3, but the M, P, and S can only have brightness of 2?
Finally, the student turns and walks a distance of 25.1 meters in a direction of 22 degrees south of east in 30.3 seconds. What is the average speed that the student was moving?
Determine the final volume of the balloon and work produced by the air inside the balloon as it expands the balloon skin.
In earlier times,ethyl ether was used as an anesthetic. When five milliliters ofethyl ether (C4H10O), density 0.714 g/mL, is burned in a bombcalorimeter, the temperature rises from 23.5 oC to 39.7 oC. The calorimeter heat capacity is 10.34 kJ/oC
Convert each set of measurements to meters and find the mean length for each group. The conversion factors are 1 in = 2.54 cm and 1 cm =0.01 m. Remember that conversion factors are exact and do not affect the number of significant digits.
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