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If a 60 W light bulb at 120 V is left on in your house to prevent burglary, and the power company charges 10 cents per kilowatt-hour, how much will it cost to leave the bulb on for 30 days?
You throw a ball, m = 2kg, with an initial velocity of 20 m/s at an angle of 60 degrees from the top of a 30m cliff. a) Using energy considerations, what is the magnitude of the velocity when it hit
What would the major product be of the reaction of 1 mole of 3,4-dibromoheptane with 1 mole of KOH in ethylene glycol?
A). What's the time constant τ? I calculated τ to be 0.016 s or 16 ms which came back correct. It is the next part that I am having trouble with. B). Find the potential differences across th
You compress a spring with k=3000 N/m a distance of 0.3m with a block of mass 4kg. After you compress the spring, you release the block. After being released, the block hits a rough surface with a c
Two 1.00g masses are attached by a spring with force constant k= 500 kg s-2. Calculate the zero point energy of the system and compare it with the thermal energy kT. If the zero point energy were c
Calculate the zero point vibrational energies for -O-H and -O-D bonds.If a reaction of these bonds involves breaking them, what does this suggest about the relative rates of the reactions of -O-H a
Calculate the velocity of an electron in the n=1 state of H atom? Show that the de Broglie wavelenth of an electron moving at velocity(velociy of an e- in n=1 state of H atom) corresponds to circum
Suppose a student comes to lab unprepared and has not written the appropriate physical data for the solvents to be used in the extraction lab. The solvent being dichloromethane used to extract caffe
Acetone and water are miscible meaning they are soluble in all proportions. Would it be possible to perform an extraction with these two liquids? Explain your answer.
Bruce places a 2.0kg block over a small hole on a table. He then puts a gun under the table and shoots a 35.0g bullet into the block where it lodges. If the block rises1.3m above the table, how fast
In a combustion reaction, one molecule of a hydrocarbon produced nine molecules of carbon dioxide and eight molecules of water. How many molecules of oxygen (O2) were consumed?
a) What is the velocity of the block after it leaves the spring but before it gets to the incline? b) How far up the incline (along the hypotenuse of the triangle) does the block travel?
An archer puts a 0.30-kg arrow to the bowstring. An average force of 201 N is exerted to draw the string back 1.3 m. Assuming that all the energy goes into the arrow, with what speed does the arrow
A 40-year-old manager, at a prominent legal firm in L.A., experiences abdominal pain post lunch. He goes to the restroom a couple of times, but continues to experience pain and cramps.
A 4kg watermelon is balanced on Bruce's shaved. R. Lee Ermey, who hates watermelons with every fiber of his being, shoots a 50g arrow at it with a speed of 30m/s. The arrow passes through the melon
An object with a constant pressure heat capacity of 200 j/K is removed from a boiling water bath and allowed to cool to room temperature. calculate the change in entropy in the object, the surroundi
A 24-hp electric motor provides power for the elevator in a 6 story building. If the total weight of the loaded elevator is 2200 lb, how long a time does it take to rise 96ft from the first to the s
A proton has an initial speed of 4.9 x 105 m/s. (a) What potential difference is required to bring the proton to rest?
To test the effectiveness of a gunpowder mixture, 1 gram was exploded under controlled STP conditions and the reaction chamber was found to expand to 310 cm3.
Two cooling fluids are available - cooling tower water at 20oC and a refrigerant at -35oC. For each fluid determine the % acetone recovery, assuming that the coolant temperature equals the condenser
A boxer receives a horizontal blow to the head that topples him over. The force, of magnitude 1.35 x 103 N, is applied for 1.7 x 10-2 s at a point 1.67 m above the floor. The boxer has a moment of ine
A hair dryer has a power rating of 12000w at 120v rms. assume that the hair dryer is the only resistance in the circuit. What is the resistance of the heating element?
Two iron bolts of equal mass - one at 100 degrees Celcius, the other at 55 degrees Celcius - are placed in an insulated container. Assuming the heat capacity of the container is negligible, what is
The drawing shows two situations in which charges are placed on the x and y axes. They are all located at the same distance of 6.4 cm from the origin O. For each of the situations in the drawing, de