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A horizontal force, F1= 75N, ad a force, F2=15.4N acting at an angle of theta to the horizontal, are applied to a block of mass m= 2.9kg, what is normal force
A rock band playing an outdoor concert produces sound at 120dB 5.0m away from their single working loudspeaker. What is the intensity (I) 5 m from the loudspeaker
A bat at rest sends out ultrasonic sound waves at 50.5 kHz and receives them returned from an object moving directly away from it at 30.5 m/s
Sunlight is observed to focus at a point 18.5cm behind a lens. What is its power in diopters
You have a 54.1 mF capacitor initially charged to a potential difference of 12.5V. You discharge the capacitor through a 4.21 ohm resisitor. What is the time constant
Some GRIN material is made in the form of a doughnut. The inside diameter (the diameter of the hole in the doughnut) is 34 cm, What should be the highest, and the lowest refractive index of the mater
When (S)-2-bromobutane undergoes an S2N reaction with CH3O-, the product is the compound shown below. What is/are the configuration of the product(s) obtained from this reaction
When a guitar string is sounded along with a 439 Hz tuning fork, a beat frequency of 2.00 Hz is heard. What is the frequency of the string
The half-life of U-235, an alpha emitter, is 7.1*10^8 yr.Calculate the number of alpha particles emitted by 9.1 mg of this nuclide in 8.0 minutes.
70 grams of water at 85°C are mixed with an equal amount of water at 15°C in a completely insulated container. How much heat is gained by the cold water
If the electron affinity for an element is a negative number does it mean that the anion of the element is more stable than the neutral atom. Explain
An object with a height of 4.0 cm is placed 30.0 cm from a lens. The resulting inverted image has a height of 1.5 cm. What is the focal length of the lens
Write electron configurations for the following ions, and determine which have noble-gas configurations. Explain your answer. (a) Cr^3+ (b) N ^3- (c) Sc^3+ (d)Cu^2+ (e)TI^+ (f)Au^+
Two stunt drivers drive directly toward each other. At time t=0 the two cars are a distance D apart, car 1 is at rest, and car 2 is moving to the left with speed v0, At what time do the two cars col
Calculate the Energy of dissolving in kilojoules/mole if 2.56 grams of CaBr2, calcium bromide, are dissolved in 50 mL of water in a calorimetric cup with a temperature rise of 4.5° C
How many grams of NaCl are needed to prepare 250 mL of an isotonic saline solution with a concentration of .90% , assuming a solution density of 1.0g/mL
An atom has only two levels, a ground state with energy -25.0 eV, What wavelength photon is required for stimulated emission of an electron in the excited state
A ray of light is incident from the air onto the surface of a diamond (n=2.42) at a 30 degree angle to the normal, calculate the speed of light in the diamond
In an acid-base titration 14.7 mL of .107M NaOH (aq) sodium hydroxide is needed to react to an end point with .1252 grams of H2C2O4 oxalic acid. Determine the molarity of the aqueous sodium hydroxid
Which of the following chemicals have the highest value 1-10 for electrical conductivity when dissolved in water and why
What is the pH at the point in a titration at which 20ml of 1.0M KOH has been added to 25ml of 1.0M HBr
A 120 kg barrel which is initially at rest is rolled down an inclined plane. The friction between the barrel and the surface of the plane is negligible, calculate the barrel's velocity when it reach
A solution is made by combining 500ml of .10M HF with 300ml of .15M NaF. What is the pH of the solution? (Ka=7.2e-4 for HF)
The solubility of Ag2CO3 in water is 2.58e-4 moles in 2 liters at 25 degrees celcius. What is the value of Ksp for Ag2CO3
Two small charges with a mass of 1.0 g each are connected by 2.0-cm-long insulating rod of negligible mass. What is the dipole moment of the rod?