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Suppose that earth was formed as molten rock at some very high temperatures. Estimate the time for the earth to cool to 300 K.
(Note: This calculation was first performed by Lord Kelvin. The cooling time determined by Kelvin was significantly smaller than the geological evidence for the age of the earth. This generated a great scientific debate. The problem was resolved with the discovery of radioactive elments in the earth. The energy released in radioactive decays increases the cooling time.)
A pendulum with a length of 185 cm is set to swinging. What is the frequency of the pendulum
Consider a particle moving in an elliptical orbit in an inverse square law central force field. What is the eccentricity of the orbit
A cyclist is pedaling at a cadence of 60, so the bicycle wheel make 60 rotations per minute around the axis through its center. What is the wheel's angular speed
question1all through a balloon ascension wearing an oxygen mask you calculate the weight of a calibrated 5.50-kg mass
A particle of charge +3.0 x 10-8 is in a unifromelectric field directed to the left. It is released from rest andmoves a distance of 5.0 cm and its kinetic energy is increased by+4.5 x -4 J.
Define how Pascal's law addresses the pressure in a fluid at different heights (or depths) before addressing the question and would you apply it in this case
The overall magnification of an astronomical telescope is desired to be 26 Ã?. What is the overall length of the telescope when adjusted for use by the relaxed eye
For the spherical distribution: A conducting spherical shell of inner radius b and outer radius c is concentric with a small metal sphere of radius a
A rocket is lauchned upward with a velocity of 3m/s. How long does it take to reach the top of its trajectory
A very tall flagpole, temporarily charged uniformly by lightning, What is the linear density of the charge on the flagpole
Two point charges are separated by d= 10 cm and have charges of q1= +2(mu)C and q2= -2 (mu)C, respectively, What is the magnitude of the electric force between the two charges
a ball of mass 0.120 kg is dropped from rest from a height of 1.25 m. it rebounds from the floor to reach a height of
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