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A comet is observed to pass the sun at a distance of closest approach of 4 x10^10 m with a speed of 3 x 10^4 m/s. Will it return, and how long will it take to move 60º arounds its orbit from th
Given that the new organism absorbs light at 840nm, and that you need to perfomre a two electron trasfer, what would the changein redox potential be?
Two long straight wires are parallel and carry current in opposite directions. The currents are 10 amps and 15 amps and the wires are separated by 0.40cm. What is the magnetic field due these curren
An inductor of 3H and resistance of 6 ohms are connected to a battery of emf 12V and of negligible internal resistance. Calculate: (i) the initial rate of increase of current
A 192 g piece of copper is heated to 100.0 deg C and then droppedinto a coffee-cup calorimeter containing 750.0 mL of water at 4.0deg C. What is the final temperature (in degrees C) of the copperand
What should the thickness of the material be for it to be nonreflecting for light of wavelength 640 nm (in nanometers)?
Two sources of light of wavelength 780 nm are 13.0 m away from a pinhole of diameter 0.100 mm. How far apart must the sources be for their diffraction patterns to be resolved by Rayleigh's criterion
An unknown volume of water at 18.2 deg C is added to 24.4 mL ofwater at 30.0 deg C. If the final temperature is 21.5 degrees C,what was the unknown volume of water added, in milliliters?
A film of oil of index of refraction n = 1.37 floats on water (n = 1.33). When illuminated with white light at normal incidence, light of wavelengths 672 and 480 nm is predominant in the reflected l
A 2.97-kg projectile is fired with an initial speed of 133 m/s at an angle of 28° with the horizontal. At the top of its trajectory, the projectile explodes into two fragments of masses 0.97 kg
Find an expression for the maximum safe period of rotation, T, in terms of the variables given above, and the gravitational acceleration, g.
A steel block has a volume of o.08m3 and a density of 7,840kg m3. What is the force of gravity acting on the block(the weight) in water?
(a) Determine the acceleration due to gravity at that height and find the orbital velocity and the period of the space station. (b) The Hubble Space Telescope orbits at 600 km. What is the telescope
Find the minimum speed at which a car can travel around this curve without skidding if the coefficient of static friction between the road and tire is 0.3. Answer in units of m/s.
It takes 208.4 kJ of energy to remove one mole of electrons from the atoms on the surface of rubidium metal. If rubidum metal is irradiated with 254 nm light, what is the maxium kenetic energy
A rock of mass m = 2.5 kg is tied to the end of a string of length L=1.2m.Theotherendofthe string is fastened to a ceiling, and the rock is set into motion so that it travels in a horizontal circle
Sodium alkylbenzene sulfonate(C18H29SO3Na) is often used as asynthetic detergent. This ingredient helps prevent scale buildup in"hard" water applications.
As a system increases in volume, it absorbs 52.5 J of energy in the form of heat from the surroundings. the piston is working against a pressure of 0.5 atm. The final volume of the system is 58 L.
Ethanol (C2H5OH) is the alcohol found inintoxicating beverages. It has a heat of vaporization ofapproximately 39.0 kJ/mol. How many joules would be released when42.0 g of ethanol vapor condensed in
If the tension in the string is zero when the rock is at its highest point (so that the string just barely goes slack), what is the tension when the rock is at the bottom?
Water's relatively high specific heat (4.184 J/g°C) makesit an ideal coolant for automobile engines. How much heat from anengine would be absorbed if 12.6 kg ofcooling system water were heated
A coin is sitting on a record. It is found that the coin slips off the record when the rotation rate is 0.30 rev/s. What is the coefficient of static friction between the coin and the record?
When using an anion exchange HPLC column in a purification proceedure the column was eluted by a linear gradient of NaCl. What does the linear gradient of NaCl accomplish in this proceedure?
a) If the contact time is 3.00 , calculate the magnitude of the average force on the ball during the contact. b) Calculate the direction of the average force on the ball during the contact.
Two cylinders with exactly the same shape. One is made up of steel,the other is made up of wood. Which one has larger moment of inertia?Why?