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Radioactive decay of granite and other rocks in Earth's interior provides sufficient energy to keep the interior molten, to heat lava, and to provide warmth to natural hot springs. This is due to the average release of about 0.03 {\rm J} per kilogram each year. Find an increase in temperature for a thermally insulated chunk of granite that takes about 13.1 million years to change temperature. (Assume that the specific heat capacity c of granite is 800 {\rm J}/{\rm kg} \cdot {\rm C}^\circ. Use the equation Q =cm \Delta T.)
a 5.1-microc point charge is located atnbspxnbsp 1.1 mnbspynbsp 2.8 m and a -3.9-microc point charge is located
If a compressive force of 3.2×104N is exerted on the end of a 18cm long bone of cross-sectional area 4.3cm2 , will the bone break, By how much does it shorten
What is the frequency of the small axial oscillations that the electron will undergo if it is free along the z-axis near the origin.
two people running a 5000 meter race. cindy is running at 2.8meterssecond. jim starts 3000s late but is running at 4.2
You are designing a centrifuge to spin at a rate of 15,850 rev/min. Calculate the maximum centripetal acceleration that a test-tube sample held in the centrifuge arm15.8 cm from the rotation axis must with stand.
a 2. kg ball moving to the right with a speed of 25m/s collides with a 15. kg ball going in the same direction with the speed of 20 m/s. What is the speed of the second ball after collision if it travels in the same direction as before
A radiator has an emissivity of .90 and its exposed area is 1.23 m^2. the temperature of the radiator is 100 degrees C, what is the heat flow rate from the radiator
two gliders on a level air track approach each other. One glider has a mass m1= 0.6 kg and a velocity v1= +4 m/s. Calculate the velocity of the joined gliders
a bar magnet is dropped through a loop of wire, what is the direction of the current at the instant it is in the middle
The specific heat of mercury is 138 J/kg Co Determine the latent heat of fusion of mercury using the following calorimeter data: 1 kg of solid Hg at its melting point of -39.0º C is placed in a 0.620 kg aluminium calorimeter with 0.40 kg of water ..
If a person of mass M simply moved forward with speed V, his kinetic energy would be1/2 MV^2. However, in addition to possessing a forward motion, What is the average angular velocity of his arms and legs
A short train (an engine plus four cars) is accelerating at 1.40 m/s^2 . The mass of each car is 3.70×104 kg, and each car has negligible frictional forces acting on it. What is the force of the engine on the first car
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