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A 110 g copper calorimeter cup contains 205 cm3 of water and 50 g of ice, all in thermal equilibrium. A 215 g piece of iron is heated to a high temperature and dropped into the water (assume no water escapes the calorimeter cup). At thermal equilibrium the temperature of the entire mixture is 30 C. How much energy is required to melt all of the ice? How much energy is required to raise the temperature of the melted ice and water and copper cup to 30 C?
the pistons in an internal combustion engine undergo a motion that is approximately simple harmonic. if the amplitude
A force F produces an acceleration a on an object of mass m=2 kg. a force 4F IS exerted on a second object and an acceleration of 8a results. ( this means that if four times the original force is exerted , a new object accelerates by an amount equal ..
An open-topped tank completely filled with water has a release valve near its bottom. The valve is 1.87 m below the water surface. Calculate the speed of the water as it exits the valve
Water drops from the nozzle of a shower onto the floor a distance d below. The drops fall at regular intervals of time, Find the location of the individual drops
zorch, an arch enemy of superman, decides to slow earth's rotation to once per 27.0 h by exerting an opposing force at, How long must zorch push with this force to achieve his goal
An elevator cable breaks when a 975 kg elevator is 24.5 m above the top of a huge spring (k = 8.00 x 10^4 N/m) at the bottom of the shaft. Calculate the amount the spring compresses
a thin 20-kg, 5.0 m long rod is bent into a semi circle. A 0.10 kg object is placed at the center of the curvature of the semi circle. WHat is the gravitational force of the rod on the object
A camera takes a perfectly exposed picture when the lens diaphragm is set to f/4 and the shutter speed is 1/250 s, what should the new shutter speed be so that the exposure is still correct
A resistor with 325? and an inductor are connected in series across an ac source that has voltage amplitude 520V . The rate at which electrical energy is dissipated in the resistor is 234W. What is the amplitude of the voltage across the inductor
You push a box up a ramp inclined at 26.2o using a force of 230.0N, for a distance of 10.9 m. How much work do you do in the horizontal direction
A spring gun is made by compressing a spring in a tube and then latching the spring at the compressed position. A 4.97 g pellet is placed against the compressed and latched spring. To what maximum height (m) will the pellet rise
Two charged plates create a potential difference of 190 V. At a point halfway between the plates an electron is released from rest. What was the initial speed and direction of the proton
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