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A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 31 m/s, the block hangs vertically down.
A 0.15 kg mass is on the end of a thing rod that is rotating about its center with an angular frequency of 17 rad/s. The rod is 0.45 m long and has a mass of 0.06 kg. What is the rotational kinetic
Calculate the percentages of Na2CO3 and NaHCO3 in the sample.Hint: Phenolphthalein will indicate when only the first equivalence point happens, Bromocresol green will indicate when the second equiva
A box weighing 480 N is pushed along a horizontal floor at constant velocity by a force of 230 N parallel to the floor. What is the coefficient of kinetic friction between the box and the floor?
A 0.45 M solution of pentanoic acid (CH3CH2CH2CH2COOH) is found tohave a pH of 3.73 at 298K. What is the value of the acid dissociation constant Ka for this monoprotic acid?
A parallel plate capacitor is held at fixed potential while a dielectric with k=10 is inserted into the vaccuum between the plates,filling spaces. A) What is now the total electric energy stored by
Two blocks are stacked one on top of the other. the coefficient of friction between the two blocks is 0.20, adn the coefficient of friction between the bottom block adn the floor is 0.10. what is th
Liquid A has vapor pressure x and liquid B has vapor pressure y. What is the mole fraction of the liquid mixture if the vapor pressure above the solution is 30% A by moles?Calculate i
0.10 moles of a diprotic acid, H2A, is dissolved in 250 mL ofwater. The Ka1 of this acid is 1.0 x 10E-5 and Ka2 is 1.0 x 10E-10. What is the concentration of the di-anion, [A^2-], in this solution(i
Determine the current in the loop in milli-amps (the resistivity for copper is 1.72 x 10-8 Ohm/meter). Please be as detailed as possible.
While traveling through space, Luke Skywalker's starfighter hits a stationary piece of space debris that has a mass of 2kg. The force the starfighter exerts on the debris is 399N that lasts for .7 s
Consider three charges q1 = 5.10 nC, q2 = 7.10 nC, and q3 = -2.60 nC, arranged in a triangle as shown below. The volume of q1 is 7.50 10-30 m3, the volume of q2 is 2.30 10-30 m3, and the volume of
If the daily recommended quantity of Ca2+ to maintain bone strength in older women is 1500 mg, how many Tums tablets are needed each day?
The mass of the blue puck is 10.0% greater than the mass of the green one. Before colliding, the pucks approach each other with momenta of equal magnitudes and opposite directions, and the green puc
(a) Find the current in the coil if the maximum torque exerted on it by the magnetic field is 0.18 N · m.
what is the distance to 70 Ophiuchi in parsecs? what is the actual length of the semimajor axis in AU? What is the sum of the massses of the two stars? Give your answer in solar masses.
Enzymes in the human liver catalyze a large number of reactionsthat degrade ingested toxic chemicals. by what factor is the rateof a detoxification reaction changed if a liver enzyme lowers the acti
A .22µF capacitor is charged by a 1.5 volt battery. After being charged, the capacitor is connected to a small electric motor that is 100% efficient. What initial voltage must the capacitor ha
Three identical point charges Q are placed at the vertices of an equilateral triangle. The length of each side of the triangle is d. What is the mag and dir of the total electrostatic force on the
A ball slides down an icy hill 100 meters high and slides up another icy hill 50 meters high, doing nothing in the middle (no speed is lost) how fast is it moving at the top of the 50 meter hill?
A ground state H-atom absorbs a photon of wavelength 60.69 nm, and its electron attains a higher energylevel. The atom then emits two photons:
A 60 kg person is parachuting and experiencing a downward acceleration of 2.4 m/s2. The mass of the parachute is 5.8 kg. (a) What is the upward force on the open parachute from the air? (b) What is
A student used a cation exchange resin to determine themolarity of sodium ion in an unknown sodium chloride solution. The student diluted the 25.00mL aliquot of the original unknownsolution to 250.0
A 0.26 kg particle moves along an x axis according to x(t) = - 14 + 3 t + 5 t2 - 5 t3, with x in meters and t in seconds. What are projections of the net force acting on the particle at t = 3.5 s on
If .934 grams of AgNO3 (formula weight 169.91 g/mol)were reacted with 100mL of 0.100 M HCL to make AgCl(formula weight 143.35 g/mol) which reactant would be the limiting reagent and t