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An engine draws energy from a hot reservoir with a temperature of 1250 K, What is the actual efficiency of this engine
Two point charges totaling 9.00 µC exert a repulsive force of 0.250 N on one another when separated by 0.537 m. What is the charge on each
The energy difference of 3.8 kJ/mol between gauche and anti butane corresponds to an equilibrium constant, Keq, of approximately 1.9. Calculate the percentage of each conformer at equilibrium.
You illuminate a slit of width 0.0527 mm with light of wavelength 715 nm and observe the resulting diffraction pattern on a screen that is situated 2.39 m from the slit
A patient has a near point of 45.0 cm and far point of 85.0 cm. Calculate the power lens needed to correct the patient's far point
An ice skater is gliding horizontally across the ice with an initial velocity of +7.77 m/s. How much time elapses before her velocity is reduced to +3.00 m/s
An athlete crosses a 28 m wide river by swimming perpendicular to the water current at a speed of 0.8 m/s relative to the water. What is the speed of the swimmer with respect to a friend at rest on th
The density of petrol is 730 kg/m^3 at 0 degrees C. Its average coefficient of expansion is 9.60 * 10^-4 degrees C. Assuming you have a 45 litre full tank, how many extra grams of petrol would you g
Use gauss law to find the electtic field E from a spherical +charged sphere of radius r
If an isolated conducting sphere 8.9 cm in radius has a net charge of 6.8 ?C and if V = 0 at infinity, what is the potential (in V) on the surface of the sphere
Sphere 1 with radius R1 has positive charge q. Sphere 2 with radius 8.0R1 is far from sphere 1 and initially uncharged. what fraction of qends up on sphere 1
Two large parallel metal plates are 1.4 cm apart and have charges of equal magnitude but opposite signs on their facing surfaces. what is the electric field (in V/m) in the region between the plates
Two point charges -2Q and +3Q are on the x-axis, -2Q at the origin and +3Q at x = D. Find two points on the x-axis within the vicinity of the charges where the electric potential is zero
What's the magnitude of the electric field at an on-axis point a distance of .7m from a ring of charge with a total charge of .8microC
A Venturi meter measures fluid speed in a pipe. A constriction (of cross-sectional area A2) is put in a pipe of normal cross-sectional area A1 (A1 = 2A2). Find the ratio of the flow speeds
A camera's flash uses the energy stored in a 270µF capacitor charged to 170V. The current in the charging circuit is not to exceed 23mA. What's the resistance in the charging circuit
You wish to boil 1.1 kg of water, which has a specific heat capacity of 4186 J/kg-K. The water is initially at room temperature (293 K). Water boils at 373 K. How much energy must be added to the wa
A box with a volume of 3.9 L contains 4 molecules. By what factor is the total number of states for all molecules increased
What, in your opinion after reading the chapter, constitutes "abnormal" behavior. How would you qualify what is outside of the "norm"
a car driving on the turnpike accelerates uniformly from 84.0 ft/s (57.3 mph) to 112 ft/s (76.4 mph) in 3.60s. what is the cars acceleration
A hiker weighing 565 N carries a 186 N pack up Mt. Whitney (elevation, 4420 m), increasing her elevation by 3000 m. Find the minimum internal work done by the hiker's muscles
A cart that is initially at rest moves down a slope that is inclined at 5o above the horizon, What is its final speed at the end of the slope
A sound wave, traveling at 353m/s, is emitted by the foghorn of a tugboat. How far away is the reflecting object
A student throws a baseball at a large gong 76 m away and hears the sound of the gong 1.95758 s later. What was the average speed of the base- ball on its way to the gong
Calculate the intermolecular collision frequency and the mean free path in a sample of helium gas with a volume of 5.0 L at 27C and 3 atm. Assume the diameter of a He atom is 50 picometers (pm).