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A simple model of the Earth includes a dense spherical core of radius 4200 km and a less dense spherical shell of thickness 2180 km (Note: the radius of the Earth is 6380 km and the mass of the Earth is 5.98 E 24 kg.) If the density of the core in this model is 10.0 g/cc, find:
(a) the density of the shell;
(b) the moment of inertia of Earth;
(c) the rotational kinetic energy of Earth;
(d) and the number of years this energy could supply the human race with all our energy needs. (We currently use about 5.00 x 1020 Joules of energy, in all forms, per year.)
A ladder 2.05 m long, weighing 229 N, initially lies flat on the ground. The ladder is raised to a vertical position. Compute the work done by the force lifting the ladder
Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 1.00 m. compute the magnitude of the initial acceleration of the third sphere
A 23 kg body is moving in the direction of the positive x axis with a speed of 292 m/s when, owing to an internal explosion, it breaks into three pieces.
You are driving home from school steadily at 80 for 150. It then begins to rain and you slow to 50. You arrive home after driving 3 hours and 20 minutes.
A 34-kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, How high does she rise during this interval
A ladder of length L = 2.6 m and mass m = 20 kg rests on a floor with coefficient of static friction %u03BCs = 0.54. What is the normal force the floor exerts on the ladder
q1. what is the smallest thickness of a soap film n1.47 that will appear black if illuminated with 490 nm light?
A student uses an audio oscillator of adjustable frequency to measure the depth of a water well. How deep is the well
The second-order dark fringe in a single-slit diffraction pattern is 1.40 mm from the center of the central maximum. calculate the wavelength of the incident light
A bucket filled with dirt of mass 20 kg is suspended by a rope that hangs over a pulley of mass 30 kg and radius 0.25 m. Everything is initially at rest.
The radius of the hydrogen atom is 0.053 nm. compute the frequency of the circular motion of the electron
A uniform 20.0 chain 2.00 long supports a 55.0 chandelier in a large public building. Find the tension in the middle link of the chain
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