A star is observed to have a parallax 0.45". Show that it is a distance of 7.2 LY away.

Q: The terminal velocity of a person falling in air depends upon the weight and the area of the person…

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Q: (a) A 19.0 kg child is riding a playground merry-go-round that is rotating at 35.0 rev/min. What…

A: This problem can be solved using centripetal force concept

Q: The distance between the Moon and the Earth is 384,500 km. The period of the Moon’s rotation is 27.3…

A: The distance between  the moon  and the earth d=384,500km=3.845×108m Period of Moon's rotation…

Q: A 3.5 kg particle starts from rest at x = 0 and has a net force given by Fx(x) = 6.0+4.0x-3.0x²…

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Q: A spider hangs from a strand of silk whose radius is 4.0 x 10-6 m. The density of the silk is 1300…

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Q: Below is an image of a cannon firing a projectile with an initial horizontal velocity. The location…

A: Since there is no acceleration in horizontal direction.  ax = 0  So horizontal velocity will be…

Q: loop 5. A transformer with 1500 turns in the primary and 300 turns in the secondary is used to…

A: Number of primary turns = 1500Number of secondary turns = 300Input voltage amplitude = 170 V Current…

Q: You are to find the coordinates of a pebble stuck i n the tread of a rolling tire that is rotating…

A: We have apg→=Rω2sinωti→-Rω2cosωtj→=Rω2sinωti→+-Rω2cosωtj→   Its magnitude is the square root of the…

Q: Prove that the resultant wave formed by the overlapping of two harmonic waves of the same wavelength…

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Q: At what distance above the surface of the earth is the acceleration due to the earth's gravity 0.665…

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Q: You are designing a diving bell to withstand the pressure of seawater at a depth of 240 mm. What is…

A: Given:-  You are designing a diving bell to withstand the pressure of seawater at a depth of d = 240…

Q: position is given by the expression 5.4t the acceleration what is m particle ap fer + = 5 seconds ?…

A: Given: The position of the object is. xt=3.4t3-5.4t…

Q: A point rotates about the origin in the ?? plane at a constant radius of 0.222 m with an angular…

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Q: In the figure below, R1 =10.0kΩ, R2 =15.0kΩ, C=0.40μF, and the ideal battery has an emf E=20.0V.…

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Q: Find the theoretical Debye temperature of copper (Cu) if the speed of sound in copper is 3901 m/s…

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Q: (a) Write down Hooke's Law for the force of a spring on a mass as a function of (x - xo), where xo…

A: As per guidelines , only 3 subparts are solved here. (a) Hook's law states that applied force equals…

Q: Write the range of frequencies of electromagnetic waves which propagate through sky wave mode.

A: Range of frequencies of EM waves which propagate through sky wave mode is 3 MHz to 30 MHz

Q: The heating coil in an electric tea pot is made of nichrome wire with a radius of 0.275 mm. If the…

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Q: Helicopter blades withstand tremendous stresses. In addition to supporting the weight of a…

A: a) First we do the conversion ω=230 rev/min=230×2π rad/min=230×2π60 rad/sec=23π3 rad/sec Now…

Q: ximize fuel effici

A: Given, The fuel efficiency E (in kilometres per litre) of a certain car driven at a speed v (in…

Q: 1. An object at infinity (or rather, very, very far away) is viewed through two consecutive nses.…

A: Concave lens A concave lens is one that bends a straight light beam away from the source and focuses…

Q: A 320-km-long high-voltage transmission line 2.00 cm in diameter carries a steady current of 1,070…

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Q: A 0.7 kg rubber ball has a horizontal velocity of 1.107 m/s at point A and goes through a projectile…

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Q: A 2.5 kg object undergoes a displacement Ar=3.0 ml +3.5 mĵ-2.0 m k along a straight line. During the…

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Q: Calculate Q, W, AH and AU for the adiabatic and reversible compression of 1.00 mol of a monatomic…

A: Introduction: Adiabatic process: It is the process where no heat transfer between system and…

Q: positive charge Q = 40 C is distributed e spherical shell of radius R = 0.25 m. A C is located at…

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Q: The figure illustrates flow through a pipe with diameters of 1.0 mm and 2.0 mm and with different…

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Q: The sinusoidal wave shown in the figure below is traveling in the positive x-direction and has a…

A: This problem can be solved using basic formulae of properties of sinusoidal waves.

Q: You have a cylinder. You don't know what its internal structure looks like, but you plan to roll it…

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Q: A uniform disk of mass M and radius R starts from rest at the top of an incline at a vertical height…

A: Solution

Q: 7. What thickness of lead shielding is needed around a 7.40 x 10¹3 Bq point source of 60 Co to…

A: Given: distance, 50m Activity, 10 mRh-1  decay rate, 7.40×1013 Bq To Find: Thickness of lead…

Q: A jet of water squirts out horizontally from a hole near the bottom of the tank, as seen in the…

A: The given data we have: vertical height: y=1.80m horizontal distance: x=1.24m diameter of the hole:…

Q: A pipe with a diameter of 8 cm narrows to a diameter of 5 cm. If water is moving with a speed of 1.5…

A: Given data as per the question Diameter at one end =8 cm Diameter at another end =5 cm

Q: As an ice skater begins a spin, his angular speed is 3.14 rad/s. After pulling in his arms, his…

A: Given data as per the question Initial angular speed =3.14 rad/s Final angular velocity =5.54 rad/s

Q: What is the kinetic energy needed to move a 114 kg car forward with a velocity of 6 m/s?

A: Given the mass of the car m=114 kg and the velocity at which we need to run the car v=6m/s we have…

Q: the I How far above the ground will the balls be at the Same level -) Det. the time the 2nd ball…

A: Given Initial velocity of first ball u1 = 15 m/s IInitial velocity of second ball u2 = 30 m/s

Q: 19. An object is in a region such that its system's potential energy as a function of position is as…

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Q: You are pulling a sled with some fire wood on it back to your winter cabin at the top of a snowy…

A: Given data:- The given angle, θ=30° The given combined weight of the sled and wood is, 10 lb The…

Q: you will be asked to determine the number of apples in the bag. Next, determine the mass applied to…

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Q: Two particles, each of mass 3.39 × 10-4 kg and speed 4.32 m/s, travel in opposite directions along…

A: Given: particle 1, m1= 3.39×10-4 kg speed, v1=4.32 m/s particle 2, m2=3.39×10-4 kg speed, v2=4.32…

Q: Venus has a 0.82 Earth mass, and a radius of 0.95 Earth radius. 7. Use this data to calculate the…

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Q: Two 3.50 kg balls are attached to the ends of a thin rod of length 36.0 cm and negligible mass. The…

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Q: In 1656, the Burgmeister (mayor) of the town of Magdeburg, Germany, Otto Von Guericke, carried out a…

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Q: A wheel that is initially at rest is mounted on an axle that is not frictionless. When a constant…

A: Introduction: Newton's Second Law for Rotation: "If a torque is applied on an object about the fixed…

Q: Spring potential energy depends on... (select any that apply) how fast the mass travels as it's…

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Q: A wave travels from air (?air = 413 kg m−2s −1) into a liquid and with a density of 950 kg m−3 and…

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Q: A motorcycle, starting from rest, accelerates at 2.82m/s2m/s2 on a circular track with a 205mm…

A: Tangential acceleration (at ) =2.82 m/s2 Diameter of circle(d) =205 mm=0.205 m Radius of circle(r)…

Q: A uniform plank of wood has a mass of 19.5kg and a length of 2.0m. A person holds the plank using…

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Q: One of the highest power lasers in the world sits on a table in the General Research Lab Building at…

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Q: By how many degrees Celsius do you need to raise the temperature of a copper rod in order to…

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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.