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The Speed of Supernova Debris. The kinetic energy
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The Cosmic Perspective (9th Edition)
- Assume the observable Universe is charge neutral, and that it contains n nuclei (hydrogen plus helium nuclei, ignoring other elements). Take the helium mass fraction as 1/4. How many electrons are there in the observable Universe? Enter your answer in scientific notation with one decimal place. Value: n = 4*1080arrow_forwardWhite Dwarf Size II. The white dwarf, Sirius B, contains 0.98 solar mass, and its density is about 2 x 106 g/cm?. Find the radius of the white dwarf in km to three significant digits. (Hint: Density = mass/volume, and the volume of a 4 sphere is Tr.) 3 km Compare your answer with the radii of the planets listed in the Table A-10. Which planet is this white dwarf is closely equal to in size? I Table A-10 I Properties of the Planets ORBITAL PROPERTIES Semimajor Axis (a) Orbital Period (P) Average Orbital Velocity (km/s) Orbital Inclination Planet (AU) (106 km) (v) (days) Eccentricity to Ecliptic Mercury 0.387 57.9 0.241 88.0 47.9 0.206 7.0° Venus 0.723 108 0.615 224.7 35.0 0.007 3.4° Earth 1.00 150 1.00 365.3 29.8 0.017 Mars 1.52 228 1.88 687.0 24.1 0.093 1.8° Jupiter 5.20 779 11.9 4332 13.1 0.049 1.30 Saturn 9.58 1433 29.5 10,759 9.7 0.056 2.5° 30,799 60,190 Uranus 19.23 2877 84.3 6.8 0.044 0.8° Neptune * By definition. 30.10 4503 164.8 5.4 0.011 1.8° PHYSICAL PROPERTIES (Earth = e)…arrow_forwardModels of the first star-forming clouds indicate that they had a temperature of roughly 150 K and a particle density of roughly 400,000 particles per cubic centimeter at the time they started trapping their internal thermal energy. ▼ Part A Estimate the mass at which thermal pressure balances gravity for these values of pressure and temperature. Express your answer in kilograms. —| ΑΣΦ Mcloud Submit Part B = Mcloud How does that mass compare with the Sun's mass? Express your answer in solar masses. Submit Request Answer = ΤΙ ΑΣΦ Request Answer ? ? kg MSun Reviewarrow_forward
- When observed from Earth, the wavelengths of light emitted by a star are shifted toward the red end of the electromagnetic spectrum. Why does this redshift occur? A The star is at rest relative to Earth. The star is moving toward Earth at decreasing speed. The star is moving toward Earth at increasing speed. D The star is moving away from Earth. DOOOarrow_forwardA star of mass 7x 100 kg is located at m and is moving with a velocity of 1.3x10, 1.1 x 10,0 m/s. Part 1 Your answer is partially correct. (a) During a time interval of 1 x 10 seconds, what is the change in the planet's velocity? i21.2258002 -21.2258002 > m/sarrow_forwardG:06)arrow_forward
- A stellar black hole may form when a massive star dies. The mass of the star collapses down to a single point. Imagine an astronaut orbiting a black hole having eight times the mass of the Sun. Assume the orbit is circular. a. Find the speed of the astronaut if his orbital radius is r = 1 AU. b. Find his speed if his orbital radius is r = 11.8 km. c. CHECK and THINK: Compare your answers to the speed of light in a vacuum. What would the astronauts orbital speed be if his orbital radius were smaller than 11.8 km?arrow_forwardCan someone help with this?arrow_forwardUsing data from Table 7.1, calculate the mass converted to energy by the fission of 1.00 kg of uranium.arrow_forward
- 1. Your friend recorded the location of a certain explosion at (11 [m] , 13 [m]). If he is aboard a bus moving at a velocity 0.6 with respect to your reference frame, what is the coordinates of the event in your reference frame? A. (8 (m] , 4 [m]) B. (4 [m] ,8 (m]) C. (24.5 [m] , 23.5 [m]) D. (23.5 (m] , 24.5 [m]) 2. Kim celebrated his birthday at (12 [m] , 13 [m]). If he took the exam at (6 [m], 10 [m]), what is the (time interval, space interval) of the two events for a person in a rocket moving at 0.50 to the left? A. (3/3 (m],0 [m]) B. (0,3/3 (m)) C. (5V3 [m], 4v3 [m]) D. (4/3 [m], 5v3 [m]) 3. A charged particle is observed in two inertial reference frames. Which of the following statements is/are TRUE about the particle? I. The charge is covariant. II. The mass is invariant. III. The momentum is invariant. А. П only B. I and II only C. II and III only D. I, II and IIIarrow_forwardGalaxy B moves away from galaxy A at 0.501 times the speed of light. Galaxy C moves away from galaxy B in the same direction at 0.729 times the speed of light. How fast does galaxy C recede from galaxy A? Express your answer as a fraction of the speed of light. Galaxy C recedes from Galaxy A at Carrow_forwardI attempted to answer this question and I'm not sure what I am doing wrong. My formula says A.S. = 206265 (separation/distance from observer) I know to convert to the same units, so I ended up with 80 Million Km being 8 x 10 ^ -6 LY Could you please explain each step especially for the part that I got wrong for both A and B?arrow_forward
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