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A student moves a box of books by attaching a rope to the box and pulling with a force of 90.0 N at an angle of 30.0 degrees. Find the acceleration of the box
A man of mass 45 kg. is standing on a uniform rolling board of length 10 m. and mass (mb = 30 kg). how far does the board retreat
Calculate the pH of a buffer solution that is 0.250 M in HCN and 0.170 M in KCN. For HCN, Ka = 4.9 x 10^-10 (pka = 9.31). Use the equilibirum approach to calculate this pH
Need some assistance: 2a) Calculate the pH of a buffer solution that is 0.250 M in HCN and 0.170 M in KCN. For HCN, Ka = 4.9 x 10^-10 (pka = 9.31). Use the equilibirum approach to calculate this pH
Two blocks with masses M1=7.90kg and M2=1.20kg are attached by a thin string which goes over a frictionless, Calculate the magnitude of the frictional force acting on M1
The most probable mechanism of reactivity for the solvoysis of 2-chloro-norbornane is: a. Sn1 b. Sn2 c. E1 d. E2 The reaction for this secondary compound was very slow going compared to solvolysis o
A satellite is in a circular orbit about the earth (ME = 5.98 x 1024 kg). The period of the satellite is 2.11 x 104 s. What is the speed at which the satellite travels
A 0.350-{\rm m}-long cylindrical capacitor consists of a solid conducting core with a radius of 1.25mm, Calculate the energy stored in the capacitor when fully charged
a fly beats its wings at a frequency of 1200 Hz. if the expansion and contraction of the wing muscles of the fly exhibits simple harmonic motion, what is the time period of a single beat of the flys
a spring is pressed against a wall so that it is compressed by 0.25 m (ie it is 0.25 m shorter than its equilibrium length). what is the speed at which the spring leaves the wall
A spring scale on a rotating platform indicates that the horizontal force on a 0.606 kg mass is 1.57 N, How long does it take for the platform to make one revolution
A velodrome track is banked so that a bicycle traveling at 62.8 km/h will have no tendency to slip to either side when traveling on the path that has a radius of curvature of 79.0 m
During 0.15 s, a wheel rotates through an angle of 2.74 rad as a point on the periphery of the wheel moves with a constant speed of 2.16 m/s
You drive on Interstate 10 from San Antonio to Houston, half the time at 63 km/h and the other half at 86 km/h. What is your average speed for the entire trip
what compound was condensed in an adol reaction to produce (2E)-5-methyl-2-(1-methylbutyl)oct-2-enal
An automobile engine slows down from 3000 rpm to 900 rpm in 4.5 s. find the total number of revolutions the engine makes in this time
Two parallel conducting plates with the small gap of 1.0 cm are charged oppositely each other. What is the acceleration of the electron
A merry-go-round starts from rest and accelerates uniformly over 23.5 s to a final angular velocity of 6.25 rev/min. Find the person's maximum radial acceleration
Platinum crystallizes in a face-centered cubic lattice (the Pt atoms are at the lattice points only). If the density of the metal is 22.3 g/cm3, what is the unit cell edge length in pm
A 5cm object is 30 cm in front of the converging lens with a focal length of 15 cm. calculate the image height
A 55.8-kg high-school student hangs from an overhead bar with both hands. What is the tension in each arm when the arms make an angle of 38.00 o with respect to the vertical
A 5.1- kg concrete block rests on a level table. A 3.6- kg mass is attached to the block by a string passing over a light, find the coefficient of friction between the block and the table
When chromium crystallizes, it forms body-centered cubic cells. The unit cell edge length is 288.7 pm. Calculate the density of chromium
Which of the following expressions hold for 0.10 mol/L Na2HA(aq). (HA2- is the doubly-ionized form of H3A, a weak triprotic acid.)
Nerve proagation in your body occurs when large electric fields in the cell membranes on neurons (1.0*10^7 N/C) cause ions to move through cell walls