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What assumptions did Johannes Kepler bring to an understanding of motions in the heavens that differed from those made by his predecessors? Discuss the scientific merit of each of these assumptions. What discoveries helped to discredit the thinking that preceded him and how?
an electric current is given by the expression i t 100 sin 120pit where i is in amperes and t is in seconds. what is
A compressed-air vessel has a volume of 10 ft^3. Cooling coils hold its temperature constant at 68 oF. The pressure now in the vessel is 100 psia. Air is flowing in at the rate of 10 lbm/h. How fast is the pressure increasing?
A disc with a radius of 12cm and a mass of .4kg is free to rotate about an axle through its center. calculate the angular acceleration of the disk
An undamped 1.42-kg horizontal spring oscillator has a spring constant of 29.9 N/m. While oscillating, it is found to have a speed of 2.53 m/s as it passes through its equilibrium positio
laser beam is incident at an angle of 28.4° to the vertical onto a solution of corn syrup in water. If the beam is refracted to 19.04° to the vertical, what is the index of refraction of the syrup solution
An asteroid of mass 1.00 x 10^9 kg comes from deep space and fallstoward Earth. Assume the asteroid started the fall from rest very far from Earth, and find the change in potential energy when it reaches a point 4.00 x10(8) m from Earth (that's jus..
A ball of mass 0.30 kg is fired with velocity 140 m/s into the barrel of a spring gun of mass 2.4 kg initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring. No energy is lost to..
A 100 gram aluminum calorimeter contains 250 gram of water. The two metals are in thermal equilibrium at 10°C. Compute the specific heat of the unknown sample
The position of a mass m = 30.0 kg is given in by x(t) = 9.0sin ((20.0)t). Calculate the magnitude of the maximum force acting on the mass
Find the threshold energy that an incident neutron must have when striking an alpha particle to produce a deuterium and tritium nucleus
On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. How long was the ball in flight
A certain string on a piano is tuned to produce middle C (f1= 261.63 Hz) by carefully adjusting the tension in the string
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