A star"s position in the sky against distant background objects has shifted by 0.4" in 6 months it returned where it was. what is the stellar parallax p of this star?   Ans. p=0.2"   b. How far is this star from the Sun?

Q: A disc rotates at 90 rpm (revolutions per minute). What is the angular speed (in rad/s)?

A: Given data:  Angular speed (ω) = 90 rpm Required: The angular speed in rad/s

Q: A man holds a 179-N ball in his hand, with the forearm horizontal (see the figure). He can support…

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Q: spinning disk is rotating at a rate of 3 rad/s in the positive counterclock-wise direction. If the…

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Q: Anupright rectangular loop of height a and width b has a lightbulb attached to it, with some…

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Q: Consider an object of mass 26.1 kg. Assume that it s made up of equal numbers of protons, neutrons,…

A: Given data:  Mass of the object (M) = 26.1 kg Object made up of equal numbers of protons, neutrons…

Q: trial 1 trial 2 trial 3 short side torque (Nm) "expected value" (same as above) (same as above)…

A: Introduction: When a force is applied at a distance from the pivot axis with condition that force is…

Q: An object is moving in a straight line at unchanging speed. This means that there is an unbalanced…

A: When a body moves with unchanging speed in a straight line then its motion is called uniform motion…

Q: Run up a flight of stairs as fast as you can, measure the time it takes and the height of one stair,…

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Q: A rod AB with length L = 0.15 m is lying on a rectangular conducting loop of zero resistance in a…

A: concept and formula since here we will use the formula of induced emf and power emf = rate of…

Q: Intense white light is incident on a diffraction grating that has 722 lines/mm. (a) What is the…

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Q: 88.3 kg88.3 kg horizontal circular platform rotates freely with no friction about its center at an…

A: mass of disc = M = 88.3 kg radius = r = 1.65 m mass of bananas = m1 = 9.71 kg distance of bananas =…

Q: Radio waves from a star, of wavelength 274 m, reach a radio telescope by two separate paths, as…

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Q: Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the…

A: Given,The diameter of the flywheel, d =  1.7 mThe mass of the flywheel, m = 230 kgThe angular…

Q: The system is made up of the 1-m, 7.1-kg uniform rod AB and the two uniform disks (each of 0.17 m…

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Q: Two stars have an angular separation of 8.50 ✕ 10−8 rad when viewed in the night sky from Earth.…

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Q: a) The diagram shows the energy level diagram for a hydrogen atom. 0 eV, -0.38 eV. -0.54 eV- -0.85…

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Q: To clean a floor, a janitor pushes on a mop handle with a force of 50.0N.(a) If the mop handle is at…

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Q: A particle with charge 1.53 x 10^-6 C moves at 2.44 x 10^6 m/s through a magnetic field of strength…

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Q: Find the pressure difference required between the ends of a 2.00 m long, 1.00 mm diameter horizontal…

A: Given data: Length of the tube, L=2m Diameter of the tube, D=1 mm. So, the radius of the tube,…

Q: A new record for running the stairs of the Empire State Building was set on February 3, 2003. The 86…

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Q: The magnetic field of an electromagnetic wave in a substance is given by, B = (2 ×10−º T) cos [à…

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Q: Fg and F represents gravitational and ele respectively between electrons situated at a distance 10…

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Q: Given a block vibrating in simple harmonic motion at a small amplitude attached to a spring of…

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Q: Birmingham, Ala. has an average January temperature of 42.6 degrees Fahrenheit. What is this average…

A: Given, The temprature of City A, T=42.6° F The temprature of City B, T=72.6° F

Q: A ball of m=1 kg is tied to the other end of an 8 m long rope hanging from the ceiling. The ball…

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Q: As part of a carnival game, a ?b=0.528 kgmb=0.528 kg ball is thrown at a stack of 22.8 cm22.8 cm…

A: As we know that these is no external torque on the system so, theses we can say that the angular…

Q: You push a 67 kg box across a floor where the coefficient of kinetic friction is uk = 0.55. The…

A: A) P = F*V  = mue_k*m*g*V  = 0.55*67*9.8*0.50  = 180.5 Watts

Q: This time the loop has constant area 0.530 m^2, and the magnetic field has constant strength 0.470…

A: Given, B = 0.470 T A = 0.530 m2 E = 0.216 V   Thus φ = BAcosθ and E = ?φ / ?t

Q: A grindstone of radius 4.0 m is initially spinning with an angular speed of 8.0 rad/s. The angular…

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Q: In the deepest woods of Siberia the temperature on a cold Winter night can be as low as -55.0 °C.…

A: Given,  In the first question, Temperature = - 55°C In the second question, Temperature = 128°C We…

Q: 1. Roller Coaster Many roller coasters use brakes midway through the ride so that the coaster…

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Q: The atoms of an FCC lattice are hard spheres touching the surfaces of the nearest neighbors.  If…

A: the lattice constant of an fcc lattice is a=22ra=22r the(110) plane in an fcc lattice is given by…

Q: A double-convex thin lens is made of glass with an index of refraction of 1.55. The radii of…

A: Given,  index of refraction =1.55 One glass radius = 57cm Secone glass radius = - 75cm We need to…

Q: es a balance point at 35.0 cm length of the wire. potentiometer arrangement, a cell of d nt shifts…

A: Electromotive force (EMF) is equal to the terminal potential difference when no current flows. Here,…

Q: 1. Initially sliding with a speed of 2.2 m/s, a 1.8-kg block collides with a spring and compresses…

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Q: A space station consists of two donut-shaped living chambers, A and B, that have the radii shown in…

A: The circumference of the circle is defined as the total distance around the circle. When we consider…

Q: Hang a mass from a spring. We are interested in the moment where you pull the mass down ( before you…

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Q: Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the…

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Q: What are the nature and location of the image?

A: Given: Object distance (u) = 50.0 cm focal length (f) = -25.0 cm (according to sign convention)…

Q: The period of a pendulum is proportional to the square root of its length. A 2.5-m- long pendulum…

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Q: The magnetic field of an wave in a substance is given by, B=(2 x 106 T) cos [x (0.04 x + 10²t)].…

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Q: Use the following to answer questions 11-13: A 12.5-kg crate slides along a horizontal frictionless…

A: GIVEN             mass of crate = 12.5 kg             velocity of crate at horizontal surface =4 m/s

Q: This time your object has a mass of 32.1 kg. Now imagine taking all the protons out of the object…

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Q: A rocket-powered hockey puck has a thrust of 4.30 N and a total mass of 1.00 kg. It is released from…

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Q: Which of the following radioactive nucleii are constantly being produced in the atmosphere because…

A: Cosmic rays are produced from Sun, they are high energy particles traveling at speed comparable to…

Q: The critical angle for an air-glass interface is  29.4°. When a light ray in air is incident on the…

A: Given,  Critical angle = 29.4° We need to find The angle of refraction =?

Q: An object accelerates when its speed or direction changes. True False

A: Given statement, An object accelerates when its speed or direction changes.  We need to discuss,…

Q: ent of inertia of 16 kg m². As it turns through 2.0 rev, its angular velocity increases from 7.0…

A: Angular acceleration of the wheel is    alpha  = ( 81 ) - ( 49 ) / 2 ( 2 pi )  = 2.54 rad/s^2

Q: Once more, please refer to the figure. This time the charge is 2.01 x 10^-6 C, the magnetic field…

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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.