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A lamp (R=150), an electric heater (R=23), and a fan (R=50) are connected in parallel across a123V line. calculate the power is expended in the heater
Making this assumption, determine the number of moles of Ca2+ present in the bottled water sample titrated. enter your answer with 3 significant figures
An incandescent lightbulb draws 0.50 A, while a compact fluorescent with the same light output draws 125 mA. How do their energy-consumption rates compare
A 315 kg sailboat has an acceleration of 0.72 m/s2 at an angle of 33° north of east. compute direction of the net force that acts on the sailboat
A concentrated solution is 68% nitric acid in water and has density of 1.39 g/ml. How many mL of this nitric solution will completely and exactly react with 143g of cu metal
Parallel conducting tracks, separated by 2.79 cm, run north and south. There is a uniform magnetic field of 1.27 T pointing upward (out of the page). What is the direction of the magnetic force on t
A horizontal desk surface measures 2.52 m x 2.05 m. If Earth's magnetic field has magnitude 0.463 mT, what is the magnetic flux through the desk surface
If you used 20 ml water to recrystallize salicylic acid at 10 °C, estimate the amount of product that can be lost as a result of dissolving in the filtrate. (solubility at 10 °C =0.14/100 ml
A -10uC charge is 3cm away from a +10uC charge. and is 4cm to the left from a +64uC charge. Find the net force on the +10uC charge
A +10uC charge is 20cm away from a -40uC charge. Detrmine the field of intensity
In the quark model of fundamental particles, a proton is composed of three quarks: two "up" quarks, each having charge +2e/3, calculate the potential energy of the subsystem of two "up" quarks
what is the fundamental mechanism by which enzymes enhance the rate of chemical reactions?
Consider two widely separated conducting spheres, 1 and 2, the second having four times the diameter of the first. What is the ratio of the final surface charge density of spheres
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of He is present in a helium-oxygen mixture having a
A 69-kg lumberjack stands at one end of a 409-kg floating log, as shown in the figure. Both the log and the lumberjack are at rest initially. calculate the lumberjacks speed relative to the shore
Calculate the percent ionization of 0.10 M butanoic acid (Ka = 1.5 x 10-5) in a solution containing 0.050 M sodium butanoate.
Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 1.00 m. compute the magnitude of the initial acceleration of the third sphere
If one added 0.01 M of CaCl2 to this solution, how many moles of Ca(OH)2 will now dissolve in 1.0 L of water containing this concentration of CaCl2
Using a simply pulley/rope system, a crewman on an Arctic expedition is trying to lower a 5.52 kg crate to the bottom of a steep ravine of height 23.9 meters. At what speed will the crewman hit the
Calculate the force required to pull a copper ball of radius 3.00 cm upward through a fluid at the constant speed 6.00 cm/s
A parallel-plate capacitor is made from two aluminum-foil sheets, each 5.6 wide and 6.0long. evaluate the capacitance of this capacitor
A 2.0 kg object moving with a velocity of +6.0 m/s collides with a 6.0 kg object that is initially at rest. Find the energy lost in the collision.
A dragster drives a quarter mile (402 m) at a constant rate of acceleration, starting from rest and finishing the race at a final speed of 450 km/hr. what average power was developed by the engine
The current in a 100 watt lightbulb is 0.800 A. The filament inside the bulb is 0.220 mm in diameter. What is the current density in the filament
Stopping a 747 A 747 jetliner lands and begins to slow to a stop as it moves along the runway. find How far has it traveled in this time