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When a molten metal is cast in a mold that is a poor conductor, the dominant resistance to heat flow is within the mold wall. Consider conditions for which a liquid metal is solidifying in a thick-waned mold of thermal conductivity k... and thermal diffusivity an. The density and latent heat of fusion of the metal are designated as p and hsf, respectively, and in both its molten and solid states the thermal conductivity of the metal is very much larger than that of the mold.
A small electric immersion heater is used to heat 110g of water for a cup of instant coffee. The heater is labeled "200 watts", which means that it converts electrical energy to thermal energy at this rate. Calculate the time required to bring this w..
a uniform electric is produced by two parallel plates separeated by 3 cm and with a battery of 36 v across them, find the speed of the electron and proton when they reach the charged plates
Two wires are identical, except that one is aluminum and one is copper. The aluminum wire has a resistance of 0.874 ohm. What is the resistance of the copper wire? Take the resistivity of copper to be 1.72 times 10-8 ohm m, and that of aluminum to be..
A box is sliding down an incline tilted at an angle 14.0° above horizontal. The box is sliding down the incline at a speed of 1.70 m/s. How far does the box slide down the incline before coming to rest
A 57 meter length of insulated copper wire is wound to form a solenoid of radius 2.3 centimeter. Find what maximum energy is stored in the inductor
A cylinder contains 2.25 mol of helium gas at 21.0°C. Assume that the helium behaves like an ideal gas. What is the average kinetic energy per molecule
A machine's part rotates at an agular speed of .06rad/s itsspeed is then increased to 2.2rad/s at an angular acceleraton of.70rad/s2. find the angle throught which the part rotates before reaching its final speed.
The Antarctic Circumpolar Waves propagates around the Antarctic continent during a period of about 8-9 years. What is the average speed of the perturbation
A mass m is lowered gently onto a vertical spring of length L with spring constant k until it just touches the spring. Let y be the distance the spring is compressed and v be the velocity of the mass. When the mass is released from rest, the equation..
A bacterium (mass = 2 × 10-15 kg) in the blood is moving at 0.28 m/s. What is the de Broglie wavelegth of this bacterium
A solenoid 90.0 cm long has a radius of 2.90 cm and a winding of 1000 turns; it carries a current of 3.60 A. Calculate the magnitude of the magnetic field inside the solenoid
Frames k and k' are inertial frames. Frame k' is moving at a velocity of magnitude v realtive to frame k in the direction of the x-axis. there are rigid rods in each frame oriented along the direction of the relative velocity. someone in frame k meas..
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