Think of our Milky Way Galaxy as a flat circular disk of diameter 100,000 light-years. Suppose we are one of 1000 civilizations, randomly distributed through the disk, interested in communicating via radio waves. How far away in light years would the nearest such civilization be from us on average? Show your working. (Hint: Begin by calculating the area of the disk. Find the area of one of a 1,000 squares. Consider the separation of the centres of two adjacent squares.)

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Q: Problem 30.1: In studies of the possibility of migrating birds using the Earth's magnetic field for…

A: The magnetic field along the axis of symmetry of loop of wire is  B=μ0Ir22(x2+r2)3/2 Here I is the…

Q: Determine the momentum of a car having mass 130 kg moving with a velocity 16 m/s

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Q: For a thin lens situaiton, you have detemined the image distance is negative. Which of the following…

A: the image distance is determined to be negative for a thin lens situation

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A: The self inductance of the coil is given by L =μ0μrN2AIwhere, A =Cross-section area of the coilN=…

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Q: A ball has a mass of 4 kg. Suppose it travels at 14 m/s. Find the kinetic energy possessed by it.

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Q: What evidence from your graph shows that the spring obeys Hooke’s Law?

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Q: 3.00 Q 5.00 1.00 E8.00 1.00 :8,00 12,0T -4.00

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A: Given: The power is 400 W. The combined mass is 30 kg. The time interval is 5 s. The kinetic energy…

Q: ENERGY AND MOMENTUM 1. A 70 kg Bungee jumper jumps from a 200 m tall tower from rest. Unstretched,…

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A: b) mass= m = 2kg frequency = f = 5 Amplitude = A = 0.25 m

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Q: Find the value of force applied if work done is 240 J and displacement is 20 m.

A: Given: The work done is 240 J. The displacement of the object is 20 m.

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A: Given that Mass of the car is M = 1000 kg Mass of the rock is m = 50 kg Distance of the car from the…

Q: Mass of a car is 230 kg, What is it's weight ?

A: Given Mass of car = 230 kg We have to calculate the weight of car.

Q: I cant see the ratio of this pressure.

A: ratio of pressure

Q: A projectile is thrown from a point O on the ground at an angle 45° from the vertical and with a…

A: Answer:-  Given  Speed (u) = 5√2 m/s  Angle of projection (A) = 450  Acceleration due to gravity (g)…

Q: What happens if you place two electrons close together?

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Q: Consider three colorless cube (X, Y and Z) with different refractive indices (nx = 1.1, ny = 2.2 and…

A: Option B is correct

Q: A small hole in the wall of a cavity in an object of any kind behaves like a blackbody because any…

A: Given, Area of the hole in black body, A = 30 cm2 = 0.003 m2 Temperature of the black body, T =…

Q: Calculate the voltage if the resistance is 35 ohms and the current is 8 A ?

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Q: What is energy healing?

A: ENERGY HEALING Energy healing is a treatment process which is used as complementary and alternative…

Q: Calculate the electrical energy consumed in Joules if a toaster of 55 W is used 5 min

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Q: A coil formed by wrapping 55 turns of wire in the shape of a square is positioned in a magnetic…

A: Given value--- number of turns = 55 . angle = 36 degree . change in magnetic field = 200 micro T to…

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Q: Two circuits are shown below, each consisting of a battery and one resistor. The batteries are ideal…

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Q: Two point charges are arranged along the x-axis; q1=2.0 µC is at x=0.80m, and q2=2.0 µC at x=0.80m.…

A: Given value--- q1 = 2 micro C, x1 = 0.8 m. q2 = 2 micro C,  x2 = 0.8 m. We have to find--- net…

Q: The sum of the magnitudes of two forces acting at point is 18 and the magnitude of their resultant…

A: Consider the magnitude of two forces acting at a point are A and B. Also, consider that the…

Q: The helicopter view in the figure below shows two people pulling on a stubborn mule. (Take F, = 126…

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Q: Find the value of force applied if work done is 240 J and displacement is 20 m.

A: Given Data : The work done is given as W = 240 J. The displacement is given as d = 20 m.

Q: A man throws a stone from the top of the building 135 m above the ground. Its initial velocity =…

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.