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A skater rotates at 4.5 revolutions per second (rev/s) with legs together and arms raised over his head. By extending his arms, What is the new rotation rate
Calculate the of a solution prepared by mixing equal volumes of 0.21 methylamine (CH3NH2, Kb = 3.7 x 10^-4 ) and 0.61 M CH3NH3Cl.
A 1.6kg , 20-cm-diameter turntable rotates at 50rpm on frictionless bearings. What is the turntable's angular velocity, in rpm, just after this event
How much heat is required to vaporize 18.5g of water at 100c. The heat of vaporization of water at 100c is 40.7kj/mole.
Laser light of wavelength 400 nm illuminates an array of very narrow slits, producing an interference pattern on a screen 70 cm from the slits. compute the separation between the slits
Starting from rest, a 12-cm-diameter compact disk takes 2.5s to reach its operating angular velocity of 1500rpm. How much torque is applied to the disk
An object's moment of inertia is 2.00kgm2 . Its angular velocity is increasing at the rate of 3.80, What is the total torque on the object
A cylinder contains 12.0l of air at a total pressure of 41.4psi and a temperature of 30c. How many moles of gas does the cylinder contain
Calculate ?Grxn at 298 K under the conditions shown below for the following reaction. SO3(g) + H2O(g) ? H2SO4(l) ?G°= -90.5 kJ P(SO3) = 0.20 atm, P(H2O) = 0.88 atm
an electric current of 1.00 A is flowing through a copper filament diameter 1.00 mm, calculate the average electron velocity v and the ?- factor, the positive and negative charge densities in the S' f
The space shuttle is in a 300km -high circular orbit. It needs to reach a 610km -high circular orbit to catch the Hubble Space Telescope for repairs, How much energy is required to boost it to the n
A gaseous mixture containing 0.200 mol fraction of carbon tetrachloride (CCl4) and 0.800 mol fraction of dry air is initially at 68.0°C and 1169 mmHg. 1- If this mixture is cooled at a constant
A lithium-5 nucleus is moving at 1.6 Mm/s when it decays into a proton and an alpha particle. What are the magnitude and direction of the proton's velocity
When optically active B was treated with CrO3 in pyridine, an optically inactive sample of A was obtained. Heating A with hydrazine in base gave hydrocarbon C, which, when heated with alkaline KMnO4
Pat (mass 53 kg) and Chris (mass 72 kg) sit in a 26-kg kayak at rest on frictionless water. What's the kayak's speed after Chris catches the pack
propanol (p*1 = 20.9 torr at 25 °C) and 2-propanol (p*2 = 45.2 torr at 25 °C) form ideal solutions in all proportions. Let x1 and x2 represent the mole fractions of 1-propanol and 2-propanol
The electric field inside a 50.0?cm? long copper wire is 5.00mV/m .What is the potential difference between the ends of the wire
A vapor composed of 0.20 mole fraction ethanol and 0.80 mole fraction acetic acid at 120.0 mmHg (absolute), is in equilibrium with a liquid phase also composed of ethanol and acetic acid.
The terminals of a 0.900V watch battery are connected by a 90.0?m?long gold wire with a diameter of 0.200mm, compute the current in the wire
Based on the Ksp values of CuS, PbS, MnS and HgS, which the the following ion pair will be the easiest to separete by fractional precipitation
Light of wavelength 2E-12 m undergoes compton scattering at an angle of 45 degrees, What is the wavelength of the scattered photon
In a pure sample of which of the following is there no hydrogen bonding? a. CH3NH2 b. (CH3)2NH c. (CH3)N d. none, pure samples of all these have hydrogen amines
A giant yo-yo of mass 360 kg measuring about 1.5 m in radius was dropped from a platform 60 m high, find the velocity of descent at the end of the fall
A 1400 kg block is lifted at a constant speed of 4 cm/s by a steel cable that passes over a massless pulley to a motor-driven winch. What force must be exerted by the cable