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Monkey first notices a lion attacking when the lion is 12.5 m away and moving toward the monkey at a speed of 5 m/s. How long does the monkeys escape last
What is the binding energy for a beryllium-9 nucleus? What is the binding energy, , for a beryllium-9 nucleus in ? Recall that . 1mev=1.60 x 10^-14
the water dissociation reaction H2O (l) --> H+(aq) + OH-(aq). What are the standard states for the three species in the two cases? Density of water is 997 kg/m^3.
An aluminum rod of length l has a resistance of .8 ohms. Half of the rod is machined down so that half of the rod now has half of the radius of the original radius. What will be the new resistance
What is the wavelength (in meters) of photons with the following energies? In what region of the electromagnetic spectrum does each appear? 91.0 kj/mol
The weight of passengers on a roller coaster increases by 60% as the car goes through a dip with a 30m radius of curvature
The sun produces energy via fusion. One of the fusion reactions that occurs in the sun is How much energy in joules is released by the fusion of 3.06 of hydrogen-1
Unlike chemical reactions, for which mass is conserved, nuclear reactions result in slight changes in mass. When mass is lost, it becomes energy according to the equation where is the energy in joul
In one day, a 75 kg mountain climber ascends from the 1500-m level on a verical cliff to the top at 2400m. What is the change in her gravitational potential energy
The reaction of pure (S)-2-chlorobutane with sodium cyanide in dimethylsulfoxide produces pure (R)-2-cyanobutane. Explain why a racemic mixture is not expected for this reaction if it occurs via an
What is the mole fraction of NaCl in this solution? what would be the vapor pressure of this solution at 45C? The vapor pressure of pure water is 23.8 torr at 25 C and 71.9 torr at 45C
Use bond enthalpy to estimate the enthalpy change for each of the following reactions: (a)H2C=O(g) + HCl(g) ---> H3C¬O¬Cl(g (b)H202(g)+2CO(g)
A 4.50 kg package slides 1.30 m down a long ramp that is inclined at 10.8° below the horizontal. Calculate the total work done on the package
The precipitated Hg was removed by filtration. The product was isloated by diethyl ether extraction. After drying over Na2SO4, solvent was removed and distillation gave the product.
For carbon tetrachloride, the boiling-point constant is 5.03 C x kg/mol, and the boiling point of pure carbon tetrachloride is 76.50 C.
A 10 gauge copper wire carries a current of 27 A. Assuming one free electron per copper atom, calculate the drift velocity of the electrons
Two horses pull a large crate of negligible mass at constant speed across a barn floor by means of two light steel cables. What is the work done by each horse
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 -> NH4+(aq) + NO3(aq) For NH3, Kb = 1.8x10-5. Enter your answer with 2 decimal pl
A 1792 kg safe is 3.01 m above a heavy-duty spring when the rope holding the safe breaks. What is the spring constant of the spring
Enter scientific notation as 1.23E4. (a) When 11.50 mL of 0.470 M HNO3 have been added. (b) When 65.00 mL of 0.470 M HNO3 have been added
Four identical springs are used as part of a car's suspension system, one on each wheel. What will be the frequency at which the car will bounce
Draw the Lewis structures for each of the following molecules or ions. Which do not obey the octet rule? (a) NO, (b) BF3, (c) , (d) OPBr3 (the P is the central atom), (e) XeF4
A spinning flywheel has rotational inertia I = 401.0 kg · m2. Its angular velocity decreases from 20.4 rad/s to zero in 261.6 s due to friction
What is the mole fraction of NaCl in this solution. what would be the vapor pressure of this solution at 45C? The vapor presssure of pure water is 23.8 torr at 25C and 71.9 torr at 45C
The nucleus of radioactive polonium-210, with a mass of about 3.49?10?25kg , is known to decay by emitting an alpha particle with a mass of about 6.68?10?27kg. what is the recoil speed of the remain