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A toy airplane moves at the end of a string about a fixed point in a horizontal circle of 1.02-m radius. If the linear speed is 8.7 m/s, what will the speed become if the string is pulled up to give
What volume of the 1 M Tris solution and what mass of (dry) naCl are needed to prepare 40 mL of a solution that is 20 mM Tris and 200 mM NaCl?
A 180 kg horizontal beam is supported at each end. A 295 kg piano rests a quarter of the way from one end. What is the vertical force on the support closest to the piano?
Find the appropriate ionization energis the handbook of chemistry and physics and calculate the U elec for Na. ignore the bond energy and compute U elec for NaH (g).
A 112-cm-long rod is rotating around its center. Its mass is 291 g and its angular velocity is 30 rad/s. Suddenly, for no apparent reason, half of the mass goes to one end of the rod and the other h
During the motion considered in the problem, assume that remains constant. Inside the rocket, a 15.6-instrument hangs from a wire that can support a maximum tension of 32.4 . Find the minimum time
A block which weighs 50.0g is put in Bromoform. Bromoform's density = 2.890 g/cm^3. Assume that the block is 40.0% submerged. What is the density of the block?
A 0.75L bottle is cleaned, dried, and closed in a room where the air is 22 degree Celsius and 44% relative humidity (that is, the water vapor in the air is 0.44 of the equilibrium vapor pressure at
How much energy would be required to ionize 5.18 mg of Na(g) atoms to Na+(g) ions? The first ionization energy of Na atoms is 496 kJ/mol.
While in a third floor office building, you notice a ball moving straight upward just outside the window. It takes 0.14 s for the ball to move up a distance of 1.10 m from the bottom to the top of t
5.30 mL of 1,8-nonadiene (d=0.74 g/mL) allowed to react with 5.25 g of hydrogen bromide gas. Two possible products can be formed. Draw the overall rxn including the structures of these two products.
A student standing on level ground finds that an imaginary straight line drawn from his eye to the top of a tree that is 180 feet away makes an angle of 17 degrees above the horizontal. If his eyes
How would your calculated value for the molecular weight of your unknown been affected (high, low, no effect) if a small quantity of the unknown stuck to the metal stirring rod and failed to dissolv
You slide a crate up a ramp at an angel of 30 degress by exerting a 225 N force parallel to the ramp. The crate moves at a constant speed. The coefficient of friction is .28. How much work did you d
Derieve an expression for the compression factor Z of a gas that obeys the equation of state p(V-nb)=nRT where b and R are constants. If the pressure and temperature are such that Vm=10b, what is t
A 562 N physics student stands on a bathroom scale in an 824 kg (including the student) elevator that is supported by a cable. As the elevator starts moving, the scale reads 442 N. Find the magnitu
How many seconds are there in a solar year (365.24 days), expresses in the correct number of significant figures. 60 sec. Per min, 60 min per hr, and 24 hours per day.
At the angle determined above the mass begins to move down the incline and experiences a frictional force. If the net acceleration of the mass down the incline is 1.2 m/s2, what is the coefficient o
The kinetic model of gases assumes the average nearest distances between 2 molecule in the gas is much greater than the size of the individual molecules making up the gas.
How many mL of concentrated HCl would be necessary to prepare 50.0ml of a 10.0 % HCl solution? Concentration HCl acid is listed as 38.0% w/w. What is the other 62.0% of the concentrated HCl solution?
Calculate how many grams of glucose would be required to prepare 400 ml of a 0.36M solution. MW= 180.You have 100X stock of a buffer. You need 100 mL of 1X buffer. How much buffer solution do you use?
Lactic acid, CH3CH(OH)COOH, has a Ka value of 1.4x10-4. How many grams of lactic acid must be added to make 197.0 mL of solution with a pH of 2.17?
When determining the melting point of your pure benzophenone, some of the molten material had solidified high on the thermometer and wire stirrer.
Rotation about the bond between the middle carbon of propane and either terminal carbon gives a series of staggered and eclipsed conformations. Calculate the torsional strain energy of a single H/C
Water flows through a horizontal tube of diameter 3.0cm that is joined to a second horizontal tube of diameter 1.9cm. The pressure difference between the tubes is 7.8kPa. Find the speed of flow in t