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Calculate the entropy change for the following system: One kilogram of 80 C aluminum is placed into 2L of 20 C water in a container with negligible heat capacity and adiabatic walls. The water and aluminum reach thermal equilibrium. Assume specific heat of aluminum and water are constants.
q1. in a science fiction story a microscopic black hole is given an enormous positive charge by firing an
Two small particles have charges Q1 = +2.5 ?C and Q2 = ?5.5 ?C. what is the distance between the particles
A 20cm length of 0.35mm diameter nichrome wire is welded into a circular loop. The loop is placed between the poles of an electromagnet, What is the induced current in the loop
Two charges are held 0.5 m apart and exert a force of 32 N on one another. what is the force they exert on one another
A hiker walks 3.50 km at an angle of 45.0 degrees north of west. After that the hiker walks 1.5 km south. What is the magnitude and direction of hiker's totally displacement.
A railroad car of mass 2.3 104 kg moving at 2.50 m/s collides and couples with two coupled railroad cars, What is the speed of the three coupled cars after the collision
A region of space contains a uniform electric field oriented along the y-axis. How is the plane of second frame oriented with respect to the plane of the first one
A ball rolling down an incline travels 6.0m in the first 0.25 seconds, and 24m in the first 0.50 seconds. What is the average speed for the first time interval
then collides with a spring whose spring constant is 250 N/m. angle is 30 degrees. Illustrate what is the maximum compression of the spring?
A charged conducting sphere of radius 18 cm has 1012 electrons removed from its surface. What is the surface charge density of the sphere
The bob of a simple pendulum that is 1.00m long is held so the sting is horizontal and just taut. How fast is the bob moving when the string makes a 30.0degree angle with the vertical
An electron in the n = 6 state of a hydrogen atom makes a transition to the n = 3, What is the wavelength of the photon emitted
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