The apparent brightness of the Sun in our sky.

Question

Want to see the full answer?

Answer 1

Question

Chapter 17, Problem 49EAP

(a)

To determine

The apparent brightness of the Sun in our sky.

(b)

To determine

The apparent brightness of our Sun if it is at a distance of 10 billion light years.

(c)

To determine

How many stars like the Sun would need to exist at a distance of 10 billion light years for their total apparent brightness to equal that of our Sun?

(d)

To determine

Compare answer to part c with estimate of the total number of stars in our observable universe from mathematical insight. Why night sky is much darker than day time sky. How much larger would the total number of stars need to be for night to be as bright as day?

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

You know from your math courses that an infinitesimal segment of a circular arc can be considered as a straight line segment. Imagine that you cover a full circle in, say, the clockwise direction, with infinitesimal displacement vectors dr. Then evaluate fdr and fdr (the circle symbol on the integral just reminds us that we have to go around the full circle).

When 1.00 g of water at 100˚C changes from the liquid to the gas phase at atmospheric pressure, its change in volume is: 1.67 x 10^-3 How much heat is added to vaporize the water? How much work is done by the water against the atmosphere in expansion? What is the change in the internal energy of the water?

1 m3 of pure water is heated from 10˚C to 120˚C at a constant pressure of 1 atm. The volume of the water is contained, but allowed to expand as needed remaining at 1 atm. Calculate the change in enthalpy of the water. You are provided with the following information at the conditions of 1 atm: The density of pure water between 10˚C and 100˚C: 1000kh/m^3 The heat capacity of water: 4.18 kj/kgK Enthalpy required to convert liquid water to gas (enthalpy of vaporization): 2260 kj/kg The heat capacity of steam: 1.7kj/kgk Is the reaction endothermic or exothermic? Why?

Answer 2

Question

Chapter 17, Problem 49EAP

(a)

To determine

The apparent brightness of the Sun in our sky.

(b)

To determine

The apparent brightness of our Sun if it is at a distance of 10 billion light years.

(c)

To determine

How many stars like the Sun would need to exist at a distance of 10 billion light years for their total apparent brightness to equal that of our Sun?

(d)

To determine

Compare answer to part c with estimate of the total number of stars in our observable universe from mathematical insight. Why night sky is much darker than day time sky. How much larger would the total number of stars need to be for night to be as bright as day?

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 3

Question

Chapter 17, Problem 49EAP

(a)

To determine

The apparent brightness of the Sun in our sky.

(b)

To determine

The apparent brightness of our Sun if it is at a distance of 10 billion light years.

(c)

To determine

How many stars like the Sun would need to exist at a distance of 10 billion light years for their total apparent brightness to equal that of our Sun?

(d)

To determine

Compare answer to part c with estimate of the total number of stars in our observable universe from mathematical insight. Why night sky is much darker than day time sky. How much larger would the total number of stars need to be for night to be as bright as day?

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 4

Question

Chapter 17, Problem 49EAP

(a)

To determine

The apparent brightness of the Sun in our sky.

(b)

To determine

The apparent brightness of our Sun if it is at a distance of 10 billion light years.

(c)

To determine

How many stars like the Sun would need to exist at a distance of 10 billion light years for their total apparent brightness to equal that of our Sun?

(d)

To determine

Compare answer to part c with estimate of the total number of stars in our observable universe from mathematical insight. Why night sky is much darker than day time sky. How much larger would the total number of stars need to be for night to be as bright as day?

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 5

Chapter 17, Problem 49EAP

(a)

To determine

The apparent brightness of the Sun in our sky.

(b)

To determine

The apparent brightness of our Sun if it is at a distance of 10 billion light years.

(c)

To determine

How many stars like the Sun would need to exist at a distance of 10 billion light years for their total apparent brightness to equal that of our Sun?

(d)

To determine

Compare answer to part c with estimate of the total number of stars in our observable universe from mathematical insight. Why night sky is much darker than day time sky. How much larger would the total number of stars need to be for night to be as bright as day?

Answer 6

Chapter 17, Problem 49EAP

(a)

To determine

The apparent brightness of the Sun in our sky.

Answer 7

Chapter 17, Problem 49EAP

(a)

To determine

The apparent brightness of the Sun in our sky.

Answer 8

(b)

To determine

The apparent brightness of our Sun if it is at a distance of 10 billion light years.

Answer 9

(b)

To determine

The apparent brightness of our Sun if it is at a distance of 10 billion light years.

Answer 10

(c)

To determine

How many stars like the Sun would need to exist at a distance of 10 billion light years for their total apparent brightness to equal that of our Sun?

Answer 11

(c)

To determine

How many stars like the Sun would need to exist at a distance of 10 billion light years for their total apparent brightness to equal that of our Sun?

Answer 12

(d)

To determine

Compare answer to part c with estimate of the total number of stars in our observable universe from mathematical insight. Why night sky is much darker than day time sky. How much larger would the total number of stars need to be for night to be as bright as day?

Answer 13

(d)

To determine

Compare answer to part c with estimate of the total number of stars in our observable universe from mathematical insight. Why night sky is much darker than day time sky. How much larger would the total number of stars need to be for night to be as bright as day?

Answer 14

Expert Solution & Answer

Answer 15

Expert Solution & Answer

Answer 16

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 17

Ch. 17 - Prob. 1VSC Ch. 17 - Prob. 2VSC Ch. 17 - Prob. 3VSC Ch. 17 - Prob. 1EAP Ch. 17 - 2. What is antimatter? How were...Ch. 17 - Prob. 3EAP Ch. 17 - Prob. 4EAP Ch. 17 - Prob. 5EAP Ch. 17 - Prob. 6EAP Ch. 17 - Prob. 7EAP

The apparent brightness of the Sun in our sky.

Concept explainers

The apparent brightness of the Sun in our sky.

The apparent brightness of our Sun if it is at a distance of 10 billion light years.

How many stars like the Sun would need to exist at a distance of 10 billion light years for their total apparent brightness to equal that of our Sun?

Compare answer to part c with estimate of the total number of stars in our observable universe from mathematical insight. Why night sky is much darker than day time sky. How much larger would the total number of stars need to be for night to be as bright as day?

Want to see the full answer?

Chapter 17 Solutions