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Two rods, one made of brass and the other made of copper, are joined end to end. The length of the brass section is 0.160 m and the length of the copper section is 0.640 m. Each segment has cross-sectional area 0.00680 m². The free end of the brass segment is in boiling water and the free end of the copper segment is in an ice and water mixture, in both cases under normal atmospheric pressure. The sides of the rods are insulated so there is no heat loss to the surroundings. What mass of ice is melted in 5.10 min by the heat conducted by the composite rod? [Hint: Thermal conductivities off brass and copper are 109.0 W/(m⋅K) and 385.0 W/(m⋅K), respectively.]
Water has a mass per mole of 18.0 g/mol, and each water molecule (H2O) has 10 electrons. What is the net charge of all these electrons
A positron is a particle with the same mass and magnitude charge as an electron, but a positron has a positive charge. how fast is the positron moving
For sound waves in air with frequency 1000 Hz, a displacement amplitude of 1.2 X 10^-8 produces a pressure amplitude of 3.0 X 10^-2 Use v_sound = 344. For 1000-Hz waves in air, what displacement amplitude would be needed for the pressure amplitude..
Two point charges are placed on the x-axis. The first charge,q1 = 8.00 nC, is placed a distance 16.0 m from the origin along the positive x-axis; the second charge, q2 = 6.00 nC, is placed a distance 9.00 m from the origin along the negativex-axis.
ssuming the kinetic energy of a neutron, confined inside acubic box, is 10 MeV in its ground state, calculate the size of the box. What are the energyies of the next three excited states?
Illustrate what is the time it takes for the bullet to hit the ground, how far down range does the bullet travel, and what is the resultant velocity (in m/s) and final angle?
A jet is circling an airport control tower at a distance of 18.0 kilometer. An observer in the tower watches the jet cross in front of the moon. Obtain the distance traveled by the jet as the observer watches the nose of the jet cross from one sid..
In a series circuit, r=21ohms L=25mH C=17uF V=150v and w=637rad/s, Calculate the peak current in the circuit
Transverse waves travel at 150 m/s on a wire of length 80 cm that is under a tension of 550 N. What is the mass of the wire
A ball of mass 0.30 kg is fired with velocity 160 m/s into the barrel of a spring gun of mass 2.5 kg initially at rest on a frictionless surface. What fraction of the ball's initial kinetic energy is stored in the spring
You place an ice cube in a microwave oven. If it requires 32,220 J to melt the ice cube and the oven delivers 97 W of power to the ice cube
A photographer in a helicopter ascending vertically at a constant rate of 1.2 m/s accidentally drops a camera out the window when the helicopter is 42.0 m above the ground. How long will it take the camera to reach the ground
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