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Assuming that the light has an average wavelength of 510.0 nm, calculate how many such photons are emitted per second by a 80.0-W incandescent lightbulb.
Calculate the change in the sun's entropy when this radiation was emitted from the surface of the sun at a temperature of 5500 K.
What was the initial negative charge on one of the spheres, and what was the initial positive charge on the other?(Hint: Use charge conservation and solve for one of the initial charges. You will en
The free energy of formation of NO is 78 kJ mol¯1 at the temperature of an automobile engine (1000 K). What is the equilibrium constant for this reaction at 1000 K?
Find both the potential energy of the system when the car is at points a and b and the change in potential energy as the car moves from point a to point b , assuming y = 0 at point b.
The element Ag has two naturally occurring isotopes 109Ag and 107Ag, and its average atomic mass is 107.868 amu. The natural abundance of 107Ag is 51.87% and its atomic mass is 106.905 amu. Calculat
If the person weigh ing 100 lb requires 2000 Calories per day, how many Calories are needed by the person weighing 150 lb?
A proton is released from rest in a uniform field of magnitude +1.41e5 N/C. Find the speed of the proton after it has traveled 4cm and 40 cm.
A stone of mass 0.3kg is tied to a string of length 0.75m and is swung in a horizontal circle with speed v. The string has a breaking-point tension of 50N. What is the largest value v can have witho
calculate the probability that the particle will be located in the range 0.5a less than or equal x less than or equal 0.75a
Analysis of a reaction mixture showed that it had the composition. Calculate the reaction quotient Qc .
A rod supports a 2.35-kg lamp. a) What is the magnitude of the tension in the rod? b) Calculate the components of the force that the bracket exerts on the rod.
The resultant displacement has a magnitude of 170 cm and is directed at an angle of 65.0° to the positive x axis. Find the magnitude and direction of the second displacement.
The temperature is -34°C. What is the change in volume of the balloon as it ascends from 1.00 atm to a pressure of 240. torr?
A particular brand of gasoline has a density of 0.737 g/mL at 25 °C. How many grams of this gasoline would fill a 12.5gal tank?
From the top of a tall building, a gun is fired. The bullet leaves the gun at a speed of 340 m/s, parallel to the ground. As the drawing shows, the bullet puts a hole in a window of another building
When 5.00 g of FeCl3 . xH20 are heated, 2.00 g of H20 are driven off. Find the chemical formula and the name of the hydrate.
A street lamp weighs 170 N. It is supported by two wires that form an angle of 150° with each other. The tensions in the wires are equal. What is the tension in each wire supporting the street l
Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat capacity of 4.18 J/°C · g.
A race car has a mass of 706 kg. It starts from rest and travels 39.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
Neutrons were discovered in 1932 more than 10 years after the existence of isotopes was confirmed. What property of electrons and protons led to the discovery? Suggest a possible reason my neutrons
A sledge loaded with bricks has a total mass of 18 kg and is pulled at constant speed by a rope inclined at 20 degrees above a horizontal surface. The coefficient of kinetic friction between the sl
A generic salt, AB, has a molar mass of 249 g/mol and a solubility of 2.70 g/L at 25 degrees Celsius. What is the Ksp of this salt at 25 degrees Celsius?
A Carnot engine has an efficiency of 35%. If 325 J of heat are released into the environment every cycle, what must be the amount of heat absorbed by the high temperature reservoir
The ladder of length, l=15m and mass of 35kg rests against a smooth frictionless wall. The coefficient of friction between the ladder and ground is 0.6 and the ladder makes an angle, theta with the