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When people exercise they shed heat to the environment by sweating and radiating. calculate the rise in body temperature after 1 hour
A 35 mm camera using a standard 50.0 mm lens is focused on a 1.80 m tall person who is standing 3.25 m from the lens. What is the height of the flower%u2019s image on the film
You wish to design a telescope using an objective lens with f(objecive) = 0.75 m. If you use an eyepiece with a magnification of 20, what is the length of the telescope
Describe how adding a solution of koh to the original sulfide precipitate results in the seperation of SN4+ ion from the other group II cation
Enter que Determine the following characteristics of the titration curve for 25.0 mL of 0.400 M NH3(aq) titrated with 0.335 M HI(aq). (For NH3, Kb = 1.8x10-5.) Enter scientific notation as 1.23E4.
A student uses an audio oscillator of adjustable frequency to measure the depth of a water well. He reports hearing two successive resonances at 50.5 Hz and 59.5 Hz. How deep is the well
Which reagent could be used to separate a mixture of aniline and toluene. A) KMnO4 in H2O B) Dilute NaOH C) Dilute NaHCO3 D) Ag(NH3)2OH E) Dilute HCl
An object is in front of a converging lens (f = 0.370 m). The magnification of the lens is m = 3.60. Through what distance should the object be moved
If 67.0 mL of 0.119 mol/L NaOH(aq) and 35.0 mL of 0.193 mol/L HA(aq) are mixed, then what is [HA] at equilibrium. Assume that HA is a weak monoprotic acid with pKa=6.23 at 25oC.
Two converging lenses are separated by 23.60 cm. The focal length of each lens is 11.00 cm, Determine the final image distance relative to the lens on the right
What is the rms current in a series RC circuit if = 3.2 kOhm, C = 0.8 microfarads (uF) , and the rms applied voltage is 130V at 79Hz? What is the power dissipated by the circuit
Write the chemical reaction for: KH2PO4/K2HPO4 buffer solution + NaOH (aq) and Write the chemical reaction for: KH2PO4/K2HPO4 buffer solution + HCl (aq)
The Pfund series results from emission/absorption of photons due to transitions of electrons in a hydrogen to/from the n = 5 energy level from/to higher energy levels
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 ? NH4+(aq) + NO3?(aq) For NH3, Kb = 1.8x10-5.
A jet flying faster than the speed of sound creates a shock cone of high pressure air. What will be the angle of the shock cone
1-mL of 0.007 M Na2SO4 was diluted in 100-mL of deionized water. What is the concentration of the Na2SO4 in ppm
The decomposition of nitrosyl bromide is shown below (Kp=2.3*10^-3) if .25 atm of each gas is initially present is the reaction at equilibrium? If not explain the direction the reaction must proceed
"Fat Man," the atomic bomb dropped on Nagasaki at the end of World War II released approximately 88 x 10^12 J of explosive energy
10g of lead (specific heat = 0.128 J/g C) at 100 C is placed on a glacier of ice at 0 C. How much ice melts
The coil wand pendulum starts swinging with an angle of 30 degrees with the vertical. After it passes through the magnetic gap, What is the energy lost by the pendulum
A lactic acid/lactate ion buffer solution contains 0.44M HC3H5O3 and 0.90 M C3H5O3^-, respectively. The K a value of lactic acid is 1.4times 10^-4. Calculate the pH of this buffer.
Would you expect the carotenoid pigment fraction to come off sooner or later than it did with 95:5 Hexane:Acetone? What effect would you expect if you used 100% hexane instead
A person sees a distant lightning strike, then 4.5 seconds later he hears the thunder clap. If it is 35 degrees Celsius, how far away was the lightning strike
A whale sends an undersea signal to its mate and then gets a response 4.5 seconds later. How far away is the whales mate