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A 22 kg child sits in a swing supported by two 1.7 m long chains. If the tension in each chain at the lowest point is 172 N, find the child's speed at the lowest point .
What is the purpose of spaying 1% dimethylglyoxime solution onto a paper cylinder?
Please enter the values you calculated for the concentrations of bromothymol blue and thymol in the mixture
You fill a rigid steel cylinder that has a volume of 20.0L with nitrogen gas (N2)(g) to a final pressure of 2.00 time 10 to the fourth kpa at 28 degrees celsius. How many moles of N2(g) does the cyl
Draw electron flow arrows and complete the Lewis structures for the reaction that occurs between an alkene and hydrogen bromide creating species A and B above.
If the rock rolls to the bottom of the hill, what is its kinetic energy at the bottom of the hill?
Calculate the energy in joules and calories lost when 58.0 gold () cools from 226 to 118
What is happenning to the bonded metal atoms during elastic deformation and what is happening to the bonded metal atoms during plastic deformation?
A 2.19 kg block initially at rest pulled to the right along a horizontal surface by a constant, horizontal force of 16.1 N. the coefficient of kinetic friction is 0.145. the acceleration of gravity
What are the signs (positive or negative) of DS and DH for the boiling of liquid water to form steam and what is the ratio of DH/DS at standard pressure?
A train 382 m long is moving on a straight track with a speed of 86.3 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 10 km/h. Assumin
What are some simple steps to determine the specificity of a co factor?
When one mole of benzene (C6H6) undergoes complete combustion, 3,170 kJ are released. Calculate the combustion energy of 0.350 kg of benzene?
A calorimeter contains 125 g of water at 26.1°C. A block of metal with a mass of 25 g is heated to 96.5°C and then placed in the water in the calorimeter. After sufficient time,
Given a 0.250 M K2CrO4 Stock Solution, describe how you would prepare a solution that is 0.0125 M K2CrO4. That is, what combination(s) of pipet and volumetric flask would you use? Typical sizes of
The vapor pressure of carbon tetrachloride, CCl4, is 0.354 atm and the vapor pressure of chloroform, CHCl3, is 0.526 atm at 316K . A solution is prepared from equal masses of these two compounds at
1.0 mol of CaCN2 and 1.0 mole of water are mixed together: CaCN2 + 3 H2O → CaCO3 + 2 NH3 How much NH3 could be produced?
A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to maximum height of 35 m above groud level. how much work is done on the mass by air r
List these molecules in order of increasing dipole moment: H2O, CBr4, H2S, HF, NH3, CO2
If 3.98 g of copper was recovered and you started with 9.10 g of copper (II) chloride, then what is the percent yield of the reaction?
What is the change in pH when 0.005 moles of HCl is added to 0.100 L of a buffer solution that is 0.100 M in CH3CO2H and 0.100 M NaCH3CO2? The Ka for acetic acid is 1.8 x 10-5.
A daredevil is shot out of a cannon at 25° to the horizontal with an initial speed of 35 m/s. A net is positioned a horizontal distance of 87 m from the cannon. At what height should the net be
What mass of natural gas {rm{(CH}}_4 ) must you burn to emit 271 kJ of heat?
A modern chealting agent used for this purpose is succimer (C4H6O4S2). What minimum mass of succimer in miligrams is needed to bind all of the lead in a patients bloodstream?
write a balanced formation equation at standard conditions for the compound HI.