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A 2.0kg wood block is launched up a wooden ramp that is inclined at a 27? angle. What speed does it have when it slides back down to its starting point
An inverted cylindrical tube is immersed in water with 20.0 cm protruding from the surface, what will be the final pressure of the air
In the figure below, a constant horizontal force app of magnitude 11 N is applied to a uniform solid cylinder by fishing line wrapped around the cylinder. what is the frictional force acting on the
A runner wearing spiked shoes pulls a 18 kg sled across frictionless ice using a horizontal spring with spring constant 170 N/m. What is the acceleration of the sled
What wavelength is expected for light composed of photons produced by an n=3 to n=1 transition in a hydrogen atom
You are walking around your neighborhood and you see a child on top of a roof of a building kick a soccer ball. How tall is the building that the child is standing on
Use tabulated thermodynamic data to calculate ?S° for the reaction: PbO2(s) + 2Ni(s) ? Pb(s) + 2NiO(s)
Mass of sodium acetate: 3.472 g pH of Original buffer solution: 4.72 ph of buffer + 6 M HCl: 3.99 ph Buffer + 6 M NaOH: 5.23 And I need help showing calculations on pH of buffer solution, buffer + H
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. Enter your answer with 2 decimal place
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
The volume of HI(aq) required to reach the equivalence point : (1c) The pH at the half-neutralization point. (1d)The pH at the equivalence point.
Arrange the following isoelectronic series in order of decreasing radius, from largest to smallest Cl- p^3- Ca^2+ K+ S^2-
Starting from rest, a 4.80-kg block slides 2.00 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is ?k = 0.436. Determine the work done by the
A dedicated sports car enthusiast polishes the inside and outside surfaces of a hubcap that is a section of a sphere. When he looks into one side of the hubcap, How far is his face from the hubcap
A proton moves perpendicular to a uniform magnetic field at a speed of 1.10 107 m/s, Determine the magnitude and direction of the field
A mixture of Ar and N2 gases has a density of 1.491 g/L at STP. What is the mole fraction of each gas
A 1970-kg car is moving down a road with a slope of 14% while speeding up at a rate of 3m/s^2. What is the direction and magnitude of the frictional force
It takes the elevator in a skyscraper 4.5s to reach its cruising speed of 12m/s. What is the passenger's weight before the elevator starts moving
Determine the number of valence electrons in each of the following elements. Ta Fe Cs
A gas of unknown molecular mass was allowed to effuse through a small opening under constant-pressure conditions. It required 67 s for 1.0 L of the gas to effuse. Under identical experimental condit
Charges of 3.0 nC, -2.0 nC, -7.0 nC, and 1.0 nC are contained inside a rectangular box with length 1.0 m, width 2.0 m, find the electric flux through the surface of the box
Calculate the equilibrium constant, Ka for the acid, HA if, at equilibrium, the pH of a 2.3 M solution of HA is 1.62
A shopper in a supermarket pushes a cart with a force of 37 N directed at an angle of 25° below the horizontal. What is the net work done on the cart
Source charge Q1= -3.00nC located at (0, 5.00mm). Source charge Q2= +2.00nC located at the origin. Find the Magnitude & direction of the net electric field
If a 0.10M aqueous weak acid solution has a pH of 2.50 what percentage of the acid is dissociated