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A block hangs in equilibrium from a vertical spring. When a second identical block is added, the original block sags by 7.00 cm.What is the oscillation frequency of the two-block system?
Assuming the solution has a heat capacity of 4.18 J/°C·g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
A box of textbooks of mass 24.7 kg rests on a loading ramp that makes angle a with the horizontal. The coefficient of kinetic friction is .25 and the coefficient of static friction is .37. Find the
50.0 g of KCl at 27.0 °C is dissolved in 100. mL of 27.0 °C water in a coffee cup calorimeter. What is the final temperature of the salt solution? Assume that the heat capacity of the
A Federation starship (1.0 106 kg) uses its tractor beam to pull a shuttlecraft (1.0 104 kg ) aboard from a distance of 8 km away. The tractor beam exerts a constant force of 4.0 104 N on the shuttl
A closed organ pipe 0.8 m long has a diameter of 7.0 cm. The air in the church is 15oC. What is the speed of sound at 15oC?
Ethanol, is added to gasoline to produce E85, a fuel for automobiles engines. How many grams of O2 are required for complete combustion of 421g of ethanol ? When C2H5OH +3O2 produces 2CO2 + 3H2O.
A toy cannon uses a spring to project a 5.40 g soft rubber ball. The spring is originally compressed by 5.09 cm and has a force constant of 7.97 N/m. When the cannon is fired, the ball moves 15.3 cm
A student titrates 50 mL of apple juice and reports the following in the titration to the phenolphthalein end? What is the concentration of the total available acide in moles/L of the apple juice?
A bucket of mass 2.00 is whirled in a vertical circle of radius 1.45 . At the lowest point of its motion the tension in the rope supporting the bucket is 23.0 .Q. WHAT IS THE SPEED OF THE BUCKET AND
A 2.10-kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 3.20sin(2πt), where F is in newtons and t is in seconds. The f
Calculate the mass percent of a NaCl solution in which 176g of NaCl is dissolved in 3.35L of water at 25 °C (density = 0.997 g/mL).
However, when the flask cools some of the vapor condenses in the flask. As a result of this observation, will the reported molar mass of the liquid be too high, too low, or unaffected?
The minimum distance required to stop a car moving at 35.0 mi/h is 40.0 ft. What is the minimum stopping distance for the same car moving at 87.0 mi/h, assuming the same rate of acceleration?
An 79-kg stuntman jumps from a window of a building situated 33 m above a catching net. Assuming that air resistance exerts a 100-N force on the stuntman as he falls, determine his velocity just be
The rxn 2NO + O2 --> 2NO2 is believed to occur by the mechanism. Under what conditions does the rate equation reduce to second-order kinetics in NO and first kinetics in O2?
How much heat would be required to convert 35.0g of ammonia (23.4KJ/mol) from the liquid to the gas phase?
A car of mass M = 800 kg traveling at 40.0 km/hour enters a banked turn covered with ice. The road is banked at an angle theta, and there is no friction between the road and the car's tires.
at these currents. The weight of this battery is 460 g. (a) Calculate the power, specific power, and specific energy of this battery in watts, watts per kilogram, and watt hours per kilogram at 5, 4
A space station in the form of a lorge wheel, 124 m in diameter, rotates to provide an "artificial gravity" of 9.3 m/s^2 for people located on the outer rim. Find the rotational frequency of the whe
A 18000 airplane lands with a speed of 72 on a stationary aircraft carrier deck that is 115 long. Find the work done by nonconservative forces in stopping the plane.
Write the net ionic equation for this neutralization reaction, including the states of matter for the reactants and products.
An airplane with a wing span of 30 m flies horizontally at a location where the downward component of the Earth's magnetic field is 5.0 × 10-5 T. Find the magnitude of the induced emf between
If Brand A, has a cost per tablet of 3.29cents/tablet and one tablet neutralizes 0.0128 mole of acid. What is the cost effectiveness of Brand A?
You determine the temperature of the mixed portions of water to be 45 oC. What is the heat capacity of the calorimeter?