Two neutron stars are separated by a distance of 1.0x1010 m. They each have a mass of 1.0x1030 kg and a radius of 500000 m. They are initially at rest with respect to each other. As measured from the rest frame, how fast are they moving when their separation has decreased to one-half its initial value?
___________ m/s (The correct answer for this is 81663.94319)
How fast are they moving when they collide?
___________ m/s (I can't figure out this answer.)
Please use my numbers to work out the solution. Thanks!
In: Physics
A lead pellet with a mass of 26.47 g and at an initial temperature of 89.98 °C was dropped into a beaker containing 100.0 g of water at an initial temperature of 22.50 °C. Given the sp heat capacity of water = 4.184 J/gK and of lead = 0.158 J/gK, calculate the final temperature of both the lead and the water?
In: Chemistry
what are the principal e-commerce business models
Name and describe the principal e-commerce business models
In: Operations Management
The mass of carbon in an animal bone fragment found in an archeology site is 200 g. If the bone registers an activity of 16 Bq, what is its age? Note: 12.0 g of C126 contains 6.02 x 1023 atoms and C146 / C126 ~ 1.3x10-12
In: Physics
Expected Return: Discrete Distribution
A stock's return has the following distribution:
| Demand for the Company's Products |
Probability of This Demand Occurring |
Rate of Return if This Demand Occurs (%) |
|||
| Weak | 0.1 | -50 | % | ||
| Below average | 0.2 | -8 | |||
| Average | 0.4 | 15 | |||
| Above average | 0.2 | 20 | |||
| Strong | 0.1 | 60 | |||
| 1.0 | |||||
Calculate the stock's expected return. Round your answer to two decimal places.
%
Calculate the standard deviation. Do not round intermediate calculations. Round your answer to two decimal places.
%
In: Finance
What is a NOSQL database? For what types of applications would be a NOSQL database preferred over a relational database. Provide the name of a NOSQL database used in the real world.
In: Computer Science
1. What are the names of the parts of a UNIX command? list them, and give a brief description of each.
2. Can multiple UNIX commands be typed on the same single command line? Explain how
3. How can you find out which utilities are available on your system for editing files? Which utilities are available for editing on your system?
4. What does the following command do? What is $PATH and echo $PATH?
5. What is the result of giving the which utility the name of a command that resides in a directory that is nor in your search path?
In: Computer Science
Section 1
How far from a -7.40 μC point charge must a 2.00 μC point charge be placed in order for the electric potential energy of the pair of charges to be -0.500 J ? (Take the energy to be zero when the charges are infinitely far apart.)
d = ____ m (The Answer Is Not 0.52 m)
Section 2
A point charge has a charge of 2.50×10−11 C .
Part A
At what distance from the point charge is the electric potential 84.0 V ? Take the potential to be zero at an infinite distance from the charge.
d = ___ m
Part B
At what distance from the point charge is the electric potential 25.0 V ? Take the potential to be zero at an infinite distance from the charge.
d = ___ m
In: Physics
Write balanced molecular and net ionic equations for the reaction that occurs when
each of the following is added to a perchloric acid solution.
a) a barium hydroxide solution
b) solid barium sulfate
c) aluminum metal
In: Chemistry
A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 7.60 m/s at an angle of 15.0
In: Physics
|
Current Year |
Previous Year |
Growth Rate |
|
|
Real GDP |
$8.4 trillion |
$8.0 trillion |
|
|
Population |
202 million |
200 million |
|
|
GDP per Capita |
1A. Calculate GDP per Capita for the current year and previous
year.
1B. What is the annual growth rate of GDP per Capita? How do you
find it?
1C. How do real GDP growth and population growth affect GDP per
capita growth?
1D. Using your calculated figure in (1B), calculate the amount of
GDP per capita (future value) after 18 years.
1E. Using the rule of 72, calculate how many years GDP per capita
will be double.
72/growth rate = number of years to double the actual
value
In: Economics
Describe the hubs and spokes model of semantic memory. Why are lesions in the premotor/motor cortices more likely to produce categorical deficits for tools than animals? Why do lesions in the anterior temporal lobe produce deficits for a wider range of concepts?
In: Anatomy and Physiology
Describe rotameter-type flowmeters, explain how they work, and compare them with
Venturi flowmeters
In: Physics
Bruins Inc. has the following items in their current
balance sheet:
Common Stock 10,000,000 shares authorized, $1,000,000 issued -
$3,000,000
Capital Surplus - $9,000,000
Treasury Stock on Common 100,000 shares -
$6,000,000
Cumulative Preferred Stock 500,000 authorized
[2%] $100 par - $8,000,000
Treasury Stock on Preferred Stock 10000 shares - $6,000,000
Retained Earnings - $60,000,000
In: Accounting
A 54.1 mg sample of sodium perchlorate contains radioactive chlorine-36 (whose atomic mass is 36.0 amu).
1. If 29.6% of the chlorine atoms in the sample are chlorine-36 and the remainder is naturally occurring nonradioactive chlorine atoms, how many disintegrations per second are produced by this sample?
The half-life of chlorine-36 is 3.0×105 yr.
In: Chemistry