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The Arecibo radio telescope in Puerto Rico can detect a wave with an intensity as low as 1x10-23 W/m2. As a “best-case” scenario for communication with extraterrestrials, consider the following: Assume an advanced civilization located at point A, a distance x away from Earth, is somehow able to harness the entire power output of a Sun-like star, converting that power completely into a radio-wave signal which is transmitted uniformly in all directions from A.
1) In order for Arecibo to detect this radio signal, what is the maximum value for x in light-years?
2) How does this maximum value compare with the 100,000-ly size of our Milky Way galaxy?
The intensity of sunlight at Earth’s orbital distance from the Sun in 1350 W/m2
A steel rod is 3 cm in diameter at 25 C. A brass ring has an interior diameter of 2.992 cm at 25 C. At what common temperture will the ring just slide into the rod?
A track is mounted on a large wheel that is free to turn with negligible friction about a vertical axis. What is the angular speed of the wheel
In exercising, a weight lifter loses 0.143 kg of water through evaporation, the heat required to evaporate the water coming from the weight lifter's body. Determine the minimum number of nutritional Calories of food
A 2.10-cm-high insect is 1.50m from a 139-mm-focal-length lens. Where is the image? Follow the sign conventions, How high is the image
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A transformer has 350 turns and 94 turns for the primary and secondary respectively. what is the output voltage of the secondary
Consider a linear model of a molecule with three atoms. The outer atoms are of mass m and the atom in the molecules center is of mass M. Determine the Eigen frequencies of the system
An object of mass m is on a frictionless table rotating with a given tangential speed vo with a radius of string ri. Find the final speed of the object after the rope was pulled down the distance d
An explosion breaks an object into two pieces, one of which has 1.5 times the mass of the other. how much kinetic energy did each piece acquire
A thin hemispherical shell of radius R has a uniform surface charge, Find the electric field at the center of the base of the hemispherical shell
A supply of copper is to be placed on a wood raft. The raft has a surface area of 28.0 m2 and a thickness 1.75 meter. Find the volume of this maximum amount of copper
A 7.5cm diameter circular loop of wire is in a 0.76T magnetic field. The loop is removed from the field in 0.21s, What is the average induced emf
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