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Using the standard heats of formation, calculate the standard enthalpy change for the following reaction;
Fe(s) + 2HCl(aq) = FeCl2(s) + H2(g)
On an old-fashioned rotating piano stool, a woman sits holding a pair of dumbbells at a distance of 0.555 m from the axis of rotation of the stool. What is the angular velocity of the system after the dumbbells are pulled in toward the axis
Calculate the number of coulombs of positive charge in 285 cm3 of (neutral) water. (Hint: A hydrogen atom contains one proton; an oxygen atom contains eight protons.)
You decide to move your desk so your back is not facing the door. As you begin to move your desk, What is the coefficient of friction between the desk and the floor
a 100j of heat energy are transferred to 20g of mercury. by how much does the temperature increase?b how much heat is
For a satellite at a height of 22,300 miles, at what speed must the satellite be traveling to achieve a circular orbit? Please show your work.
a generator has a 140-turn square coil 5 cm on a side.a find the peak emf in this coil when its rotating at 110hz in
You are given a pendulum composed of a 0.024 kg mass on the end of a 0.60 m long massless string. Find the gravitational potential energy of the mass
Determine the number of calories needed to change 32 g of water at 25 degrees Celsius in to steam at 100 degrees Celcuis.
Two 6.0 kg objects head toward each other. Object A moves with a velocity of +7.0 m/s and Object B travels with a velocity of -5.0 m/s. What are their resulting velocities if the collision is perfectly elastic
A wooden chest is pulled across a level ship's deck by a force of 2.20E2 N. If the chest accelerates at 0.488 m/s² and coefficient of friction between the object and the deck is 0.310, what is the mass of the wooden chest?
A 6.1-kg object with a velocity of 1.4 m/s in the +x-direction makes a head-on elastic collision with a second object of mass 5 kg, initially at rest. What is the final velocity of the second object
A certain athlete consistently throws a javelin at a speed of 28meter per second. Find his best distance in meter
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