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A 2.0-kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. The elastic potential energy of the spring/mass system is 2.8 J. What is the elastic potentia
A piece of angle iron is hinged at point A. Determine the resultant torque at A due to the two acting forces. Replace the 60 N force by a 40 N force and the 80 N force by a 100 N force. Please show
Find the resultant force on the donkey if the angle between the two ropes is a) 60°, b) 90°, c) 120°. One end is pulled with a force of 60 lb and the other is with a force of 30 lb. Use
When 5.00 g of fructose, C6H12O6, (FW 180.16 g/mol) is burned in a calorimeter whose heat capacity is 29.7 kJ/oK, the temperature increases by 2.635oK. Calculate the heat of combustion of fructose i
A bulb emits light uniformly in all directions. The average emitted power is 150W. At a distance of 5m from the bulb, determine. The average intensity of the light, the end value of the electric fie
The temperature of moist air leaving the dehumidifier unit, in°C. The volumetric flow rate of air entering the air conditioner,in m3/min. The rate of water condensed, in kg/min.
A 2400 resistor and a 1.8 if capacitor are connected in series across a generator(60hz 120v rms). Determine the average power delivered to the circuit.
Eliminate the parameter from the parametric equation:
Express as a sine or cosine function. 4cosxsin(x/2)cos(x/2)
Why does the introduction of a para nitro group have a much greater effect on the acidity constant of phenol than it does on benzoic acid? Justify your response by using appropriate resonance struct
Question: A sealed bottle of carbonated water (CO2 dissolved in water) has an initial pressure of 1.64 bar at 1 C. If the lid develops a small leak so that the system comes to equilibrium at PCO2 =
Describe two different energy alternatives to fossil fuels in detail. Discuss how they work, how they compare with fossil fuels, and their relative advantages and disadvantages.
Find the center, radius, and intercepts of the circle x^2+y^2+4x+2y-20=0
When 2.45g of an unknown weak acid (HA) with a molar mass of 85.0g/mol is dissolved in 250.0g of water, the freezing point of the resulting solution is -0.258 degrees C. Calculate Ka for the unknown
Why does the precipitate disappear when H2O is added? It is pushing the reaction to the left; why? It is not more reactant being added. It is changing Ksp but I thought only a change in temp would c
When 1.000g of tropinone is burned in a calorimeter with heat capacity of 25.950 kjC, the temperature increases from 25.262c to 25.993c. What is the change in enthalpy of tropinone?
A sine function y = f (x) has a period of 8 and amplitude of 3. It is also known that f (2) =18 is a minimum value of the function. Find the maximum value of the function.
What is the effect of increasing concentration on the internal resistance of a primary cell?
What happened when CaCO3 was combined with hydrochloric acid? was a chemical reaction obvious here ? what about NaOH added to HCl? Was a reaction obvious in this case? Why indicators are important t
A vector with initial point (-2,6) and terminal point (-4,3) is translated so that its initial point is at the origin. Find its new terminal point. Is it -2, and 9?
Two sides and a angle of a non-right triangle are given as a=7, b=9, and B =49 degrees. Solve the triangle. Please show your work.
12.0 moles of gas are in a 3.00L tank at 22.7C. Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constants for methane are a=2.300L^2*a
Find the area of the triangle A= α = 20 degrees, b = 11, and c = 9. Please show all of your work
A sample of Chlorine gas occupies a colume of 711 mL at pressure of 251 mmHg. Calculate the pressure of the gas (in mmHg) if the volume is reduced at constant temperature to 173 mL in scientific not
Given the following heat capacities, (assume they are constant over the temperature range in consideration here), calculate enthalpy for the reaction 2NO + O2 ->2NO2 at 398k. Assume no heat loss