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The human body on average contains 6 liters of blood. If 20 drops are equal to 1 milliliter, how many drops of blood are in the average human body?
A 1.0 ounce piece of chocolate contains 15 of caffeine, and a 6.0 ounce cup of regular coffee contains 105 of caffeine.How much chocolate would you have to consume to get as much caffeine as you wo
The mass of the gas in the balloon must be 200 kilograms less than the mass of the ambient air it displaces. Pres-sure (ambient and in the balloon) is 100 kPa and ambient temperature is 300 K. Mass
A 281 ball is tied to a string. It is pulled to an angle of 3.6 and released to swing as a pendulum. A student with a stopwatch finds that 26 oscillations take 18 .
Express the work of isothermal reversible expansion of a van der Waals gas in reduced variables and find a definition of reduced work that makes the overall expression independent of the identity of
You estimate your line of sight with the top of the arch to be 9.8° above the horizontal. Approximately how far (in kilometers) are you from the base of the arch?
A conducting slab (think of a large flat sheet of metal) is large compared to the size of individual particles and molecules and carries an excess positive charge. a) Where does the excess charge re
A small mailbag is released from a helicopter that is descending steadily at 3.00 m/s.
Both fields point in the same direction. A positive 1.8-µC charge moves at a speed of 2.50 x 106 m/s in a direction that is perpendicular to both fields. Determine the magnitude of the net force
Suppose you have two 100mL graduated cylinders. In each cylinder there is 40.0mL of water. You also have two cubes: One is lead, and the other is aluminum. Each cube measures 2.0cm on each isde.
A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273K to 373K. If 20J of work is done by the gas during this process, what is the mass of helium present?
The acid equilibrim constant (k) for benzoic acid is 6.46 X 10 ^5. Note that this calculatio doesn't account for the benzoic acid that has precipitated from solution, but you can assume that the hig
If one-third the resulting carbon dioxide remained in the atmosphere, what would be the annual rate of increase in atmospheric carbon dioxide around the year 2020? Assume that the fuels are 75% carb
Two identical 25 g particles each carry 2.0 uC (micro Coulomb's) of charge. One is held fixed, and the other is placed 1.0 mm away and released. Find the speed of the moving charge when it's 1.0 cm
How many minutes does it take light from the sun to reach the Earth? (The distance from the sun to Earth is 93 million mi; the speed of light is 3.00 x 10to the 8th power m/s.)
The product gas from a solid fuel combustion reaction has the following dry-basis molar composition: 72.0% CO2, 2.57% CO, .0592% SO2, and 25.4% O2
Suppose that 0.90 grams of water condenses on a 75.0 grams of block of iron that is initially at 20 degrees celcius. The heat released during condensation goes only to warming the iron block, what i
If initially .30 mol of Br2 and .30 mol Cl2 are introduced into a 1.0 L container at 400. K, what will be the equilibrium concentration of BrCl? Assume the initial product concentration is zero.
A sample of propane (c3h8) is placed in a closed vessel together with an amount of O2 that is 2.50 times the amount needed to completely oxidize the propane to CO2 and h20 at constant temperature.
An antacid tablet from Brand A is broken in half. One of the pieces weighs 0.56g. This piece is stirred with water and 4 drops of phenolphthalein. Two burets are set up.
Not all element names come from english or latin words. the sysmbol for tungsten is W from the german word wolfram. the symbol for mercury is Hg from the greek word hydragyrum.
An electron begins at rest, and then is accelerated by a uniform electric field of 800N/C that extends over a distance of 7 cm. Find the speed of the electron after it leaves the region of uniform e
A sample of tap water consists of water, fluoride ions, calcium ions, and several other dissolved ions. The ions are evenly distributed throughout the water.
Oscillation of a 170 Hz tuning fork sets up standing waves in a string clamped at both ends. The wave speed for the string is 520 m/s. The standing wave has four loops and an amplitude of 4.7 mm. Wh
If a diver 40 m below the surface of a deep lake fills his lungs to the full capacity of 6 liters and then rises quickly to the surface, to what volume will his lungs expand? Is such a rapid ascent