If the galaxy NGC 6643 is 588 million light-years away, what is the lookback time to the galaxy? What does lookback time mean

Q: 03.] A 22°C Day is warm, while a swimming pool at 22°C feels cool. Why?

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Q: I am at the age of mid forty and visited to the doctor to get prescription of my eye glass. Assume…

A: Power of a lens is given by, P = 1/f where, f is the focal distance Hypermetropia or long…

Q: A small car that was moving at 23 m/s collides with a large truck that was moving at 15 m/s. Which…

A: Momentum Change is directly proportional to the speed of object. So The higher speed Object…

Q: A block of mass 0.241 kg is placed on top of a light, vertical spring of force constant 5 200 N/m…

A: Given data:  Mass (m) = 0.241 kg Spring constant (k) = 5200 N/m Comparison in spring (x) = 0.101 m…

Q: Find the magnitude and location of the force exerted by a liquid s=0.85 on one side of the vertical…

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Q: What are the conditions for (or assumptions of) free fall motion in both 1-D and 2-D along with…

A: The motion of a body under gravity alone is called free fall .

Q: What gauge pressure must a pump produce to pump water from the bottom of the Grand Canyon (elevation…

A: This question is based on unit conversion.

Q: An atom is constrained to move along the horizontal axis only. At time t = 0.0 s, the atom is at x =…

A: Given data:  Initial position at t= 0.0s x0 = 0.28 m Final position at t=2.1 s x = 0.59 m Required:…

Q: The magnetic field near the surface of a neutron star has a magnitude of 1.00 108 T. Find the…

A: Write the expression for the magnetic field and substitute the required values. Here, q is the…

Q: Light with a wavelength of 646 nm passes through two slits and forms an interference pattern on a…

A: Given, Light with a wavelength of  646 nm passes through two slits and forms an interference pattern…

Q: What is the acceleration of a projectile when it reaches its highest point? What is its acceleration…

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Q: Light with a wavelength of 646 nm passes through two slits and forms an interference pattern on a…

A: Given with λ= 646nm = 646×10-9m and distance of screen  D=8.75 m y=10.32 cm=10.32×10-2 m

Q: A small electric immersion heater is used to heat 94 g of water for a cup of instant coffee. The…

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Q: To measure the coefficient of kinetic friction by sliding a block down an inclined plane the block…

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Q: A small car with mass 0.600 kg travels at constant speed on the inside of a track that is a vertical…

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Q: I am at the age of mid forty and visited to the doctor to get prescription of my eye glass. Assume…

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Q: For an ideal gas held at room temperature (293 K), if the pressure is changed from 2 atm to 8 atm,…

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Q: Two streams merge to form a river. One stream has a width of 8.1 m, depth of 3.9 m, and current…

A: Given that, Let there be two streams, stream 1 and stream 2. They merge to form a river.  For stream…

Q: When the distance between the plates for a parallel-plates capacitor increases, the area should also…

A: The capacitance of the parallel plate capacitor is given by    C=ε0Ad........(1) Where, 'A' is the…

Q: Two cars collide at an icy intersection and stick together afterward. The first car has a mass of…

A: Given data: The mass of the fast car m1=1300 kg The mass of the second car m2=750 kg The velocity of…

Q: The 100lb resultant of the four forces together with the three of those  four forces is shown.…

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Q: The magnetic field near the surface of a neutron star has a magnitude of 1.00  108 T. Find the…

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Q: What is the sled's speed when the spring returns to its uncompressed length? What is the sled's…

A: Given Mass of sled+rider = m = 75.9 kg Spring constant = k = 37.0 N/cm = 3700 N/m Initially spring…

Q: A 47.0 kg stunt pilot who has been diving her airplane vertically pulls out of the dive by changing…

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Q: A block of wood has a mass of 3.50 kg and a density of 642 kg/m³. It is to be loaded with lead (1.13…

A: Given, mass of the wood block, m = 3.50 kg the density of the wood, ρw = 642 kgm3 the density of the…

Q: The heating element of a coffeemaker operates at 120 V and carries a current of 6.00 A. Assuming the…

A: Given data:  Voltage (V) = 120 V Current (I) = 6.00 A Mass (m) = 0.680 kg Initial temperature (T0) =…

Q: Two ropes in a vertical plane exert equal magnitude forces on a hanging weight and pull with an…

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Q: 17. A 5-kg rope that is 20 m long is woven to an 8-kg- rope that is 16 m long

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Q: Using the graphical method, find the sum of the vectors in each number. Draw your vectors on a…

A: A vector is a physical entity that has both magnitude and direction. It is represented as an one…

Q: A crate of eggs is located in the middle of the flat bed of a pickup truck as the truck negotiates a…

A: Given, r = 39.8 m  µ = 0.650 Here, the frictional force is radially inward. The horizontal force…

Q: Part A Take the density of the crown to be Pe. What is the ratio of the crown's apparent weight (in…

A: Given:-  We have a weight tool as given in the figure.  On the left side of the weight machine with…

Q: Learning Goal: To understand the meaning and the basic applications of pV diagrams for an ideal gas.…

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Q: The mass center of the 1255-kg rear-engine car is located as shown in the figure. Determine the…

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Q: Physics student is driving the string at the end at an angular frequency of 40.3 Hz. If the…

A: Given Data, Angular frequency ω=40.3 Hz Wavelength λ=5 m

Q: Compare your measurement to the generally accepted value of g (from a textbook or other source).…

A: As we know the generally accepted value for acceleration due to gravity (g) is 9.8m/s2

Q: Consider a conical pendulum with a bob of mass m = 82.0 kg on a string of length L = 10.0 m that…

A: Solution: Part (a) solution

Q: When you weigh yourself on good old terra firma(solid ground), your weight is 148 lb . In an…

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Q: According to legend, the following challenge led Archimedes to the discovery of his famous…

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Q: THE MOTION OF A CAR IS GOVERNED BY THE RELATON S = V^2 - 9 WHEN t=0 V=3m/sec and S = 0 FIND a, V…

A: Given, THE MOTION OF A CAR IS GOVERNED BY THE RELATON S = V^2 - 9 WHEN t=0 V=3m/sec and S = 0 So…

Q: In which type of collision is momentum conserved, a) elastic collisions, b) inelastic collisions, c)…

A: Momentum of objects before and after collision is always equal in both elastic and inelastic…

Q: A 14.0 [cm] long test tube is placed in a centrifuge, oriented at 30.0° with respect to the vertical…

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Q: 1. In a game of baseball, a player hits a high fly ball to the outfield. Is there a point during the…

A: Given :- Baseball player hits a ball .when to draw graph between velocity and acceleration.

Q: A luggage handler pulls a 20.0 kg suitcase up a ramp inclined at 33.0° above the horizontal by a…

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Q: Which of the following statement is correct? O v²=v² - 2a(x-x) X Х0 O v² =v² + 2a(x-x₂) O v²=v² +2a…

A: Given data:  Initial velocity = vx0 Final velocity = vx Initial position = x0 Final position = x…

Q: The higher frequency limit for human hearing is 23.9  kHz. If the air temperature is 12.2 °C, the…

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Q: Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.9×106 N. one an…

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Q: A ball with an initial velocity of 12 m/s moves at an angle 56° above the +x-direction. The ball…

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Q: A rock, which weighs 1400 N in air, has an apparent weight of 900 N when submerged in fresh water…

A: Given Weight of rock is W=1400 N apparent weight is Wa=900 N Find the volume of the rock?

Q: An Object has an accelration a(t)=(1,t) a) Determine the velocity of the object at time t if  it is…

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Q: You hold one end of a rope and pull horizontally with a force of 65 N. Calculate the tension in the…

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Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.