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a 40 x 10^3 kg train is travelling at 8.3m/s when the engineer sees a sheep on the tracks. she throws the emergenxy brakes on. How long is it before the rain will come to a complete stop
What is the pH of the equivalence point of the two solutions if you then titrate these solutions separately with the NaOH solution? The Ka for acetic acid is 1.8e-5.
A box of mass 50 kg is at rest on a horizontal frictionless surface. A constant horizontal force F then acts on the box and accelerates it to the right. What is the magnitude of the force
two basketball players collide head on. play a weighs 80 kg and is travelling 2.5m/s to the right while player b weighs 68 kg and is travelling 1.2 m/s to the left, what is the change in momentum of
The manufacturers of a particular brand of car conduct head-on collision tests and find that in the absence of a passenger side air bag, What is the average force exerted on the childs head during co
Capacitors won't hold a charge indefinitely; as time goes on, charge gradually migrates from the positive to the negative plate. What is the leakage resistance
The elements contained in acetylsalicyic acid are hydrogen, carbon, and oxygen. The combustion of 3.000 g of the pure compound yields 1.200 g of water and 3.72 L of dry carbon dioxide, measured at S
As you walk across a synthetic-fiber rug on a cold, dry winter day, you pick up an excess charge of -58uc. How many excess electrons did you pick up
The volume of .05 M KOH solution that contains the same number of mmol as .1 mL of tert-butyl bromide? For the number of mmol of tert-butyl bromide, I got .8912 mmol.
Compare the temperature of your water bath at the time of reflux with the boiling point of your solvent
Calculate the pH of a buffer solution that is 0.423 M in H3BO3 and 0.199 M in NaH2BO3. The Ka of H3BO3 is 5.8e-10. a) The pH of this solution
Does (CH3CH2)2C=CHCH2CH3 have any cis/trans isomers and if so what are they? Also what's the compound structure?
Acetic acid, CH3COOH, is a weak monoprotic acid (pKa=4.74 at 25oC). What is the pH of 0.191 mol/L CH3COOH(aq) at 25oC
A rocket burns fuel at a rate of 200 kg/s and exhausts the gas at a relative speed of 4.0 km/s. Find the thrust of the rocket
Give the structure for an isomer of compound A that has a melting point that is appreciably different from that of A yet NMR spectra that are almost identical to those of A. Include wedge/dash bonds
A standing wave is oscillating at 140 Hz on a string, as shown in the figure. What is the speed of traveling waves on this string
Provide a structure for the following compound: C9H10O3; IR: 2400-3200, 1700, 1630 cm-1; 1H NMR: ? 1.53 (3H, t, J = 8 Hz); ? 4.32 (2H, q, J = 8 Hz); ? 7.08, ? 8.13 (4H, pair of leaning doublets, J =
A large man sits on a four-legged chair with his feet off the floor. The combined mass of the man and chair is 95.0 kg. what pressure does each leg exert on the floor
You have a string with a mass of 0.0129 kg. You stretch the string with a force of 9.67 N, giving it a length of 1.95 m. What is the wavelength of the standing wave you create in the string
Calculate the energy difference (E) for the transition from n = 1 to n = 4 energy levels of hydrogen per 1 mol of H atoms.
An average froghopper insect has a mass of 12.3 mg and reaches a maximum height of 290 mm when its takeoff angle is 58 degrees above the horizontal. Find the takeoff speed of the froghoppper
If a person of mass M simply moved forward with speed V, his kinetic energy would be1/2 MV^2. However, in addition to possessing a forward motion, What is the average angular velocity of his arms an
Sulfurous acid, H2SO3, is a weak diprotic acid (pKa,1=1.89 and pKa,2=7.21 at 25oC). What is the pH of 0.121 mol/L H2SO3(aq) at 25oC? Give your answer accurate to two decimal places.
on a hot day a house is kept cool by an air conditioner. The outside temperature is 32 degrees celsius and the inside temperature is 21 degree celsius. what is the mechanical power that it requires
A certain metal with atomic mass 2.6 × 10?25 kg has an interatomic bond with length 2.5 × 10?10 m and stiffness 45 N/m. What is the speed of sound in a rod made of this metal