The average luminosity density of stars in the uni- verse is nL = 2 x 108 Lo Mpc 3. In the presently preferred cosmological model, the horizon distance is

Q: A box whose mass is 65 kg is moved across a horizontal floor by dragging it with a rope attached to…

A: Given : Mass of box(m)= 65 kgForce by rope(F)= 400 NAngle with horizontal()= 30°Distance travelled…

Q: Particles q₁= -53.0 µC, q₂ = +105 µC, and 93-88.0 μC are in a line. Particles q₁ and q2 are…

A: Charge  Chage  Charge  Distance between q1 and q2 is r12=0.50 mDistance between q1 and q3 is r…

Q: uniform ball of radius 0.1 m and mass 1 kg is released from rest on a no-slip surface, as shown in…

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Q: Describe the energy transformation process as the ball swings from one side to the other. (For…

A: The professor is teaching his students about the conservation of mechanical energy by giving example…

Q: A 100 °C, 80 g of copper is immersed in a water of 100 g at 15 °C. The whole system is kept in an…

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Q: 0.260 kg A 0.010 kg PO - 0.260 kg 6.0 cm ↓. 8.0 cm | 8.0 cm B

A: See below

Q: A 2.0 kg projectile with initial velocity v→ = 6.5 ı^ m/s experiences the variable force  F→ =-2.0t…

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Q: In a typical nuclear fission event, a nucleus splits roughly in half. In this case, two nuclear…

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Q: A trap-jaw ant snaps its mandibles shut at very high speed, a good trait for catching small prey.…

A: The mass of the ant is,The force exerted exerted on the ant is,The time period is,

Q: (L11) A thin 0.120 m copper rod on the x-y plane and parallel to the x axis moves with a constant…

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Q: How tall must a plane mirror be in order for you to be able to see your full image in it? a. The…

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Q: Block I  and II weigh .260 kilograms each. Block III weighs .010 kilograms. Calculate the magnitude…

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Q: Cable AB passes over the small ideal pulley C without a change in its tension. What length of cable…

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Q: What is the total entropy change for a 0.450 kg piece of ice at an initial temperature of 0.00 degC…

A: Given dataThe mass of the piece is m = 0.450 kg.The initial temperature of the piece of ice is .The…

Q: Two thin lenses with focal lengths f1=+150 mm and f2=-100 mm are located d=60 mm apart in air. a)…

A: “Since you have posted a question with multiple sub parts, we will provide the solution only to the…

Q: Particles q₁ = -66.3 μC, q2 = +108 µC, and 93-43.2 μC are in a line. Particles q₁ and q2 are…

A: Particles q1= -66.3 uC, q2=+108 uC, q3= -43.2 uC Separation distance are same between cahrges q1…

Q: Find the charge g(t) on the capacitor and the current i(t) in the given LRC-series circuit. L = 1 h,…

A: Given LRC Circuit - L=1 h, R=100 ohm, C=0.0004 f, E(t)=30 V q(0)=0, i(0)=4 A

Q: The following overall sound pressure levels are measured from individual items of plant at the same…

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Q: A mass weighing 24 pounds, attached to the end of a spring, stretches it 4 inches. Initially, the…

A: Weight ht W= 24 poundsGravitational acceleration g=32ft/s2stretch length x0= 4 inchesInitial…

Q: (L10) A magnetic field is used to suspend a wire of mass 3.50E-2 kg length 0.171 m. The wire is…

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Q: Is this a maxwell-boltzman distribution curve or is this a curve having to with blackbody radiation?…

A: from the above picture , it is asked which  distribution it represents .  now we will study two…

Q: (L10) In a lab at UTD, a straight vertical long wire carries a current of 5.25 A downward (pointing…

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Q: Option #2: A roller coaster car is at the top of a huge hill and is at rest briefly. Then it rolls…

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Q: An automatic dryer spins wet clothes at an angular speed of 5.8 rad/s. Starting from rest, the dryer…

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Q: es A bob of mass mis suspended from a string of length L, forming a pendulum. The period of this…

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Q: Compute for the electric potential at A(-3,6,4) given the electric field due to a uniform infinite…

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Q: A mass mA= 2.0kg, moving with a velocity vA = (4.0i +5.0j -2.0k) collides with a mass mB = 3.0 kg…

A: Mass of object A is Initial velocity of object A is Mass of object B is Initially object B is at…

Q: 16. (1) Find the direction of the force on a negative charge for each diagram shown in Fig. 27-42,…

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Q: The circuit shown in following figure contains two batteries, each with an emf and an internal…

A: The circuit shown in following figure contains two batteries each with an emf and an internal…

Q: In the circuit all the capacitors are initially discharged, the battery has no internal resistance,…

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Q: 5.- For A = 3î +ĵ-k, B = −î+ 2ĵ+ 5k and C = 2j - 3k, find a) C - (Ā – B), b) (Ā + C)xB

A: We need to find,

Q: An automobile with a mass of 1200 kg travels at a speed of 90 km/h. a) What is its kinetic energy?…

A: Given data:Mass (m) = 1200 kgSpeed (v) = 90km/h=(90×1000)/(3600)=25m/s

Q: Two identical particles have the following speeds before the collision v_(0_A )=-201 m/s and v_(0_B…

A: According to the conservation of momentum, if the net external force acting on a system is zero, the…

Q: (L09) A particle with mass 3.15E-4 kg carries a charge q. The particle is given an initial…

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Q: A soccer star is traveling with a car of a mass of 880 kg on a horizontal road at a velocity of 30…

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Q: model rocket is on a cart that is rolling to the right at a speed of 2.5 m/sm/s. The rocket

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Q: Find the charge on the capacitor in an LRC-series circuit when L = n L = 1½ h, R = 10 N, C = 0.01 f,…

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Q: 22.- A 110kg box is being pushed at a constant speed down the ramp with a 32° inclination a…

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Q: 0.60-T magnetic field is directed perpendicular to the plane of a circular loop of radius 0.40 m.…

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Q: 2. In which of these three arrangements (A, B, or C) of a disc magnet and an iOlab would the iOLab…

A: if Bx negative is the maximisedthen coordinate should be time.

Q: Question 6. A planet has a mass of 7.93 x 1023 kg and a radius of 2.65 x 106 m. (a) What the…

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Q: Student Workbook Document Sharing User Settings For help with math skills, you may want to review.…

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Q: A 1500-kg barge is being towed by means of two horizontal cables. One cable is pulling with a force…

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Q: A 15 kg object rests on a table. A cord is attached to this object and also to a wall. Another…

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Q: 1. Set m₁ (2 x 10⁹ kg) and m₂ (4 x 10⁹ kg) as shown in the table m₁*m₂=8 x 10¹8 kg² 2. d is constant…

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Q: Suppose that we have a parallel-plate capacitor. Each plate has an area of 0.15-m2 and the…

A: The area of the plate is The distance between the plates is d = 0.001 mThe maximum displacement…

Q: 14-gauge copper wire has a diameter of 1.636 mm. What magnitude current flows in amperes when the…

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Q: 37.- An airplane propeller has a mass of 70Kg and a radius of gyration of 75cm. Find the moment of…

A: The moment of inertia (I) of a rotating object is a measure of its resistance to changes in its…

Q: (1 light-year = 9.5 x 1015 m), and the angular speed of the star is 1.6 x 10-15 rad/s. (a) Determine…

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Q: A ball is kicked with a horizontal velocity of 30 m/s from the top of a cliff as shown 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.