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In the sun, suppose the value of E (energy production per second per gram) drops to 1% of its central value at r/R = .02, which can be taken as the outer boundary of the solar core. Assume E==pT^4 where p is density and T is temperature. You have this data: T(at r=0) = 16 million K and T(at r/R=0.2) = 8 million K. By what factor has the density dropped in the core from center to outer edge?
A cockroach of mass m lies on the rim of a uniform disk of mass 8 m that can rotate freely about its center like a merry-go-round. determine the angular velocity of the cockroach-disk system
You're standing on a carousel 1.34 m from its axis of rotation. What minimum distance would you need to walk to arrive at a position where your contribution to the total moment of inertia has doubled?
A speeder is pulling directly away and increasing his distance from a police car that is moving at 25 m/s with respect to the ground. Find the speeder's speed with respect to the ground
Consider two particles, each with a charge of +Q located at the opposite corners of a square of side d. What is the direction of the net electrical field at point P
calculate the maximum range when radar operates at 10ghz and has peak power10 mwattsn ratio10dbantenna cross
A solid wire with a radius of 3.00 mm carries a current of 0.0530 A. Assume the current is uniformly distributed in the wire. obtain the magnetic field strength at the center of the wire
A window air-conditioner unit absorbs 9.70×104J of heat per minute from the room being cooled, What is the energy efficiency rating of the unit
Find the number of revolutions that the wheel turns before it stops(and begins to turn in the opposite direction).
A velocity selector has a magnetic field of magnitude 0.32 T perpendicular to an electric field of magnitude of 0.34 MV/m. What must be the speed of a particle for it to pass through undeflected
At a pressure of 0.0760 atm a constant-volume ideal gas thermometer reads a temperature of 345 K. What is the thermometer's triple point pressure, Pt
A 21g particle is moving to the left at 29 m/s. How much work must be done on the particle to cause it to move to the right at 41 m/s.
Concept Simulation 5.1 reviews the concepts that are involved in this problem. A child is twirling a 0.0282-kg ball on a string in a horizontal circle whose radius is 0.109 m. by what factor does the centripetal force increase
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