Horizons: Exploring the Universe (MindTap Course List)
14th Edition
ISBN: 9781305960961
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 9, Problem 6P
To determine
Velocity of the shock wave in kilometers per seconds.
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If a giant molecular cloud is 73 pc in diameter and a shock wave can sweep through it at 9 million years, how fast is the shock wave going in km per second? 1 pc = 3.1× 10^13 km; 1 yr = 3.2 × 10^ 7 s.
A giant molecular cloud is 30 pc in diameter and has a density of 339 hydrogen molecules/cm^3. What is it's mass in units of solar masses? (notes: the volume of a sphere is 4/3pieR^3, and the mass of a hydrogen atom is 1.67 x 10^-27kg. A hydrogen molecule consists of 2 H atoms
If a giant molecular cloud is 60 pc in diameter and a shock wave can sweep through it in 3 million years, how fast is the shock wave going in kilometers per second?
Chapter 9 Solutions
Horizons: Exploring the Universe (MindTap Course List)
Ch. 9 - Prob. 1RQCh. 9 - Why evidence can you cite that the interstellar...Ch. 9 - Prob. 3RQCh. 9 - Prob. 4RQCh. 9 - Prob. 5RQCh. 9 - Prob. 6RQCh. 9 - Prob. 7RQCh. 9 - Prob. 8RQCh. 9 - Prob. 9RQCh. 9 - Prob. 10RQ
Ch. 9 - Prob. 11RQCh. 9 - Prob. 12RQCh. 9 - How does the CNO cycle differ from the...Ch. 9 - Prob. 14RQCh. 9 - Step-by-step, explain how energy flows from the...Ch. 9 - Prob. 16RQCh. 9 - Prob. 17RQCh. 9 - Prob. 18RQCh. 9 - Prob. 19RQCh. 9 - Prob. 20RQCh. 9 - Prob. 1DQCh. 9 - What is your favorite home-cooked meal? In terms...Ch. 9 - Prob. 3DQCh. 9 - How does hydrostatic equilibrium relate to hot-air...Ch. 9 - Prob. 1PCh. 9 - Prob. 2PCh. 9 - Prob. 3PCh. 9 - Prob. 4PCh. 9 - Prob. 5PCh. 9 - Prob. 6PCh. 9 - Prob. 7PCh. 9 - Prob. 8PCh. 9 - Prob. 9PCh. 9 - Prob. 10PCh. 9 - If a protostellar disk is 200 AU in radius and the...Ch. 9 - Prob. 12PCh. 9 - Prob. 13PCh. 9 - Prob. 14PCh. 9 - H much energy is produced when the CNO cycle...Ch. 9 - Prob. 16PCh. 9 - Prob. 1LTLCh. 9 - Prob. 2LTL
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- A giant molecular cloud is 30 pc in diameter and has a density of 330 hydrogen molecules/cm^3. What is it's mass in units of solar masses? (Notes: the volume of a sphere is 4/3pieR^3 , and the mass of a hydrogen atom is 1.67 x 10^-27 kg. A hydrogen molecule consists of 2 H atoms.)arrow_forwardIf a giant molecular cloud is 38 pc in diameter and a shock wave can sweep through it in 6 million years, how fast is the shock wave going in kilometers per second? (Notes: 1 pc = 3.1 1013 km; 1 yr = 3.2 107 s.) answer in km/sarrow_forwardIf a giant molecular cloud has a diameter of 56 pc and drifts relative to nearby objects at 19 km/s, how long (in yr) does it take to travel a distance equal to its own diameter?arrow_forward
- If a giant molecular cloud is 60 pc in diameter and a shock wave sweeps through at 25 km/s, how long will it take the shock wave (in years) to sweep through the cloud?arrow_forwardA giant molecular cloud is 22 pc in diameter and has a density of 240 hydrogen molecules/cm3. What is its mass in units of solar masses? (Notes: The volume of a sphere is 4/3 πR3 and the mass of a hydrogen atom is 1.67 ✕ 10−27 kg. A hydrogen molecule consists of 2 H atoms.) Answer in Kgarrow_forwardA planetary nebula expanded in radius 0.3 arc seconds in 30 years. Doppler measurements show the nebula is expanding at a rate of 35 km/s. How far away is the nebula in parsecs? First, determine what distance the nebular expanded in parsecs during the time mentioned. Δd = vpc/sTs So we first need to convert the rate into pc/s and the time into seconds: vpc/s = vkm/s (1 pc / 3.09 x 1013km) vpc/s = ? Ts = (Tyr)(365 days/yr)(24 hrs/day)(3600 s/hr) Ts = ? s Δd= vpc/sTs Therefore, Δd = ? pcarrow_forward
- A planetary nebula expands at 32 km/s. How far will it expand (in km) in 0.6 million years?arrow_forwardIf a giant molecular cloud has a mass of 2.0 ✕ 1035 kg, and it converts 8 percent of its mass into stars during a single encounter with a shock wave, how many stars can it make? Assume the stars each contain 1 solar mass. (Hint: The mass of the Sun is 1.99 ✕ 1030 kg.)arrow_forwardA red giant loses a solar mass in 150,000 years via a superwind. After 0.9 million years, it has a mass of 9.5MSun. What was its original mass? (Give your answer in terms of MSun.) A planetary nebula expands at 38 km/s. How far will it expand (in km) in 3 million years?arrow_forward
- If a giant molecular cloud is a distance of 27 pc away from Earth and drifts at a speed of 27 km/s toward Earth, how long (in years) would it take to reach Earth if the Sun remained at its current position?arrow_forwardA molecular cloud is 22 pc in diameter and is located 303 pc from Earth. What is its angular size on the sky (in arc seconds)? The cloud has a density of n = 8,500 hydrogen molecules/cm³. What is the total mass of the cloud in solar masses? (Approximate the molecular cloud as spherical.)arrow_forwardsuppose a planetary nebula is 2.8 pc in diameter, and doppler shifts in its spectrum show that the planetary nebula is 33 km/s. how old is the planetary nebula? 1 pc= 3.1 ×10^13 km and 1 yr= 3.2 × 10^7sarrow_forward
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