# Roger

Popular questions and responses by Roger-
## physics

A small mailbag is released from a helicopter that is descending steadily at 1.01 m/s. (a) After 4.00 s, what is the speed of the mailbag? v = m/s (b) How far is it below the helicopter? d = m (c) What are your answers to parts (a) and (b) if the

*asked on August 30, 2012* -
## physics

An object moves with constant acceleration 3.65 m/s2 and over a time interval reaches a final velocity of 10.4 m/s. (a) If its initial velocity is 5.2 m/s, what is its displacement during the time interval? m (b) What is the distance it travels during this

*asked on August 30, 2012* -
## not sure where to begin

In what ways is your standard of living different from that of your parents or grandparents when they were your age? Why have these changes occurred ?

*asked on March 7, 2013* -
## Physics

A baggage cart full of luggage is coasting at a speed vA across the airport taxiway. When eighteen percent of the mass of the cart and luggage is thrown off the cart, parallel to the ground and in the forward direction, the cart is brought to a halt. If

*asked on March 3, 2014* -
## English

I need some help again with these.I have to correct faulty parallelism in the following sentences. I think I have corrected a couple but some I need help on. 1. Activities on Wednesday afternoons include fishing trips, dance lessons, and computers. 2.

*asked on June 28, 2010* -
## Civics practice history

Which of the following provides the definition of a nation?

*asked on November 14, 2017* -
## Probability

The numbers 1 to 15 are placed in a hat, and a number is selected. What is the probability that the number is 4 given it is known to be an even number?

*asked on June 25, 2015* -
## U.S. History

Which statement BEST distinguishes the Viet Cong from the North Vietnamese Army? A) The North Vietnamese Army fought beside the allied forces, while the Viet Cong fought against the allied forces. B) The North Vietnamese Army represented the political

*asked on July 1, 2015* -
## maths

A man goes upstream for a distance of 10 kms in 5 hours. Another man goes downstream the same distance of 10 kms in 3 hours. what is the difference in speeds of two men if the river speed is 0.5 km/hr

*asked on August 29, 2014* -
## MATH PLEASE HELP!

According to Boyle's law, the pressure p of a compressed gas is inversely proportional to the volume, v. If a pressure of 20 pounds per square inch exists when the volume of the gas is 500 cubic inches, what is the pressure when the gas is compressed to

*asked on January 7, 2009* -
## Geometry

What is the relationship between the side length and the apothem of an equilateral triangle?

*asked on July 13, 2015* -
## U.S. History

What effect did the demobilization that followed World War I have on the American workforce? A) Members of labor unions were viewed as disloyal and were monitored by the FBI. B) Thousands of women and African-Americans lost their jobs as returning

*asked on July 1, 2015* -
## english

I have to edit the following sentences to untangle mixed constructions. Here is the list of five and my corrections below them. 1. Early diagnosis of prostate cancer is often curable. 2. Depending on our method of travel and our destination determines how

*asked on July 1, 2010* -
## physics

a steel ball dropped from a tower strikes the ground in 3.0 seconds. Find the velocity with which the ball strikes the ground and the height of the tower in meters.

*asked on June 20, 2014* -
## Physics

Automobile Airbags. The human body can survive an acceleration trauma incident (sudden stop) if the magnitude of the acceleration is less than 250 m/s2. If you are in an automobile accident with an initial speed of 60 km/h (37 mi/h) and you are stopped by

*asked on September 9, 2013* -
## Chemistry

A sample of hydrogen gas (H2) is produced in a laboratory by displacement of water. A 645 mL sample of hydrogen is collected at 25 degrees Celsius and a total pressure of 758 torr. Collecting gas by water displacement causes the gas to become saturated

*asked on May 20, 2016* -
## English

Can you please help me? I have put in some that I think is right but it doesn't look right. The direction goes as follows; Edit the following sentences to correct errors in pronoun reference. In some cases you will need decide on an antecedent that the

*asked on June 28, 2010* -
## History

How did the Assyrian empire dominate Mesopotamia? A. It dominated Mesopotamia through its use of archery forces and stone weapons. B. It dominated Mesopotamia through its use of cavalry forces and iron weapons. C. It dominated Mesopotamia through its use

*asked on October 16, 2019* -
## math

A wire 320 in. long is cut into two pieces. One piece is formed into a square and the other into a circle. If the two figures have the same area, what are the lengths of the two pieces of wire (to the nearest tenth of an inch)?

*asked on September 3, 2012* -
## physics

A boy on a motor scooter is traveling at a velocity of 14.1 m/s when he applies his brakes in order to stop. How much time will it take him to stop if he slows down at a rate of 3.2 m/s2?

*asked on June 11, 2014* -
## economics?

If you were president, would you be more interested in your economic advisors' positive views or their normative views ? Why ?

*asked on March 11, 2013* -
## Algebra

Austin drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 8 hours. When Austin drove home, there was no traffic and the trip only took 5 hours. If his average rate was 21 miles per hour faster on the trip home,

*asked on November 1, 2015* -
## english

I need help. I need to revise any run-on sentences. The first one is this. Not sure if these are correct. Death Valley National Monument located in Southern California and Nevada, is one of the hottest place on earth. Temperatures there have soared as high

*asked on June 10, 2010* -
## physics

at the start of a race , a horse accelerates out of the gate at a rate of 3.00m/s squared. how long does it take the horse to cover the first 25.0m of the race?

*asked on June 20, 2014* -
## Geometry

what is the relationship between the side length and the apothem in a regular hexagon?

*asked on July 13, 2015* -
## english

I need help with these, I have to edit the following sentences to eliminate problems with subject-verb agreement. 1. Measles is a contagious childhood disease. 2. Adorning a shelf in the lab are a Vietnamese figurine, a set of Korean clay gods, and an

*asked on June 20, 2010* -
## math

Two fishing boats depart a harbor at the same time, one traveling east, the other south. The eastbound boat travels at a speed 1 mi/h faster than the southbound boat. After nine hours the boats are x = 45 mi apart. Find the speed of the southbound boat.

*asked on September 3, 2012* -
## physics

A motorist is driving at a constant velocity of 28 m/s when he decides to pass a car that is in front of him. He accelerates at a rate of 2.5 m/s2 for 3.0 seconds while passing the car. What is his velocity at the end of the 3.0 seconds?

*asked on June 11, 2014* -
## Math

Shawn Bixby borrowed $22,000 on a 150-day, 13% note. After 75 days, Shawn paid $2,500 on the note. On day 106, Shawn paid an additional $4,500. Use ordinary interest. What is the total interest and ending balance due?

*asked on September 26, 2016* -
## Algebra

A size 36 shoe in France is size 3.5 in England. A function that converts shoe sizes in France to those in England is g(x)= 3x-94/4. A size 6 shoe in the United States is size 3.5 in England. A function that converts shoe sizes in England to those in the

*asked on September 11, 2010* -
## Math

Correct the error in this equation: 6(2y+6)=4(9+3y) 12y+36=36+12y 12y=12y 0=0 y=0

*asked on October 7, 2010* -
## Algebra

Please Help. How long, to the nearest tenth of a year, will it take $12,500 to grow to $20,000 at 6.5% annual interest compounded quartely? (Use the formula for compound interest with n compoundings per year to solve for t.)

*asked on December 3, 2010* -
## pre alger

Suppose that a car normally sells for $16,500 and is now on sale for $14,000. What is the percent of discount? If necessary, round your answer to the nearest tenth.

*asked on March 5, 2013* -
## biology

People with a lactose intolerance are able to take products such as Lactaid that contain the lactase enzyme with their meals. These products can be taken in pill form. Considering the fact that the pill form of the enzyme would have to travel through the

*asked on February 17, 2013* -
## physics

a rock is thrown vertically down from a bridge with an initial velocity of 30m/s and strikes the water in 2.0sec. find the velocity with which the rock strikes and the height of the bridge.

*asked on June 20, 2014* -
## Math

John wants to build a corral next to his barn.He has 300 feet of fencing to enclose three sides of his rectangular yard. a. What is the largest area that can be enclosed? b. What dimensions will result in the largest yard?

*asked on September 20, 2010* -
## algebra

Help! A size 36 shoe in France is size 3.5 in England. A function that converts shoe sizes in France to those in England is . A size 6 shoe in the United States is size 3.5 in England. A function that converts shoe sizes in England to those in the United

*asked on September 10, 2010* -
## Chemistry

A sample of phosphorus of mass 3.654 g reacts with dichlorine to form 16.20 g of a molecular compound. What is the empirical formula of this compound?

*asked on December 9, 2010* -
## chemistry

Hey, can somebody here help me with this stuff? 1) Why are radioisotopes with long half-lives not administered internally in medical procedures? 2) What % of C-14 would you expect a piece of 34000 year-old fossilized bone from a mastodon to have when

*asked on January 2, 2007* -
## Physics

Calculate the distance (in km)that Larry runs if he maintains an average speed of 8km/hr for 45 minutes.

*asked on March 5, 2011* -
## College Algebra

Please help! x-2y+z=7 2x+y-z=0 3x+2y-2z=-2 a. Solve the above system of equations using Gaussian Elimination or Gauss-Jordan Elimination. You must show row operations. b. Solve the above system of equations using Cramer's Rule.

*asked on November 17, 2010* -
## Algebra

Express the sum below using summation notation. Use 1 as the lower limits of summation and i for the index of summation. 1/3+2/4+3/5+...+18/20

*asked on December 5, 2010* -
## Math

If a quadrilateral wxyz is similar to quadrilaterl lmnp how do I find the value x and y?

*asked on September 30, 2009* -
## physics

a horse is running with an initial velocity of 11m/s and begins to accelerate at -1.81m/s^2. how long does it take for the horse to stop?

*asked on October 5, 2014* -
## math

A ship sails 50km on a bearing of 080 degrees calculate how far east it travels to the nearest tenth

*asked on June 8, 2016* -
## Geology maps

An environmental restoration project requires that you enlarge part of the map to a scale of 1 inch to 1000 feet. Calculate the factor by which it needs to be enlarged.

*asked on March 3, 2011* -
## MATH

The value V of a machine t years after it is purchased is inversely proportional to the square root of t+2. The initial value of the machine is $10,000. Find the rate of depreciation when t=5 . Round your answer to two decimal places. A. -381.80 PER YEAR

*asked on September 19, 2011* -
## College Algebra

Help! Write the equation of the function that has a graph the shape of , vertically shrunk by a factor of 1/4 and shifted right 6 units. Write the equation of the function that has a graph the shape of y = „ x„ , reflected about the x-axis and shifted

*asked on September 10, 2010* -
## chemistry

A hot air balloon is filled with 15 moles helium gas and 5 moles nitrogen gas. What is the volume of the balloon at 1.01 atm and 300 K?

*asked on November 14, 2018* -
## math

Wendy took a trip from city A to city B, a distance of 560 mi. She traveled part of the way by bus, which arrived at the train station just in time for Wendy to complete her journey by train. The bus averaged 40 mi/h, and the train averaged 110 mi/h. The

*asked on September 3, 2012* -
## AP BIOLOGY LAB

I am doing an ap biology lab on plant photosynthesis. It's specifically lab # 4 on plant pigments and photosynthesis and it's on question # 8 on Exercise 4B: Photosynthesis/ The Light Reaction. Identify the function of each of the cuvettes. I already have

*asked on November 2, 2008* -
## calculus

Use the demand function X=325(1-(6p/7p+4)) to find the rate of change in the demand x for the given price p=$5.00. Round your answer to two decimal places. A. 5.13 UNITS PER DOLLAR B. -0.85 UNITS PER DOLLAR C. 0.85 UNITS PER DOLLAR D. 1.35 UNITS PER DOLLAR

*asked on September 19, 2011* -
## Stastics

To help consumers assess the risks they are taking, the Food and Drug Administration (FDA) publishes the amount of nicotine found in all commercial brands of cigarettes. A new cigarette has recently been marketed. The FDA tests on this cigarette yielded

*asked on November 28, 2010* -
## physics

a stone is thrown straight upward and rises to a maximum vertical height of 40.0m. with what velocity was it thrown and how long does it take for the stone to return to the initial level from which it was thrown?

*asked on June 20, 2014* -
## Managerial Econmics

Suppose you own a home remodeling company. You are currently earning short- run profits. The home remodeling industry is an increasing- cost industry. In the long run, what do you expect will happen to … a. …your firm’s costs of production? Explain.

*asked on October 31, 2010* -
## math

ok, i need to write an expression equal to 10 and the numbers i need to use are 5,8,9,7 and i need to use +, /, + can anyone help me?

*asked on August 29, 2010* -
## biology

30. Enzymes function most efficiently at the temperature of a typical cell, which is 37 degrees Celsius. Increases or decreases in temperature can significantly lower the reaction rate. What does this suggest about the importance of temperature-regulating

*asked on February 17, 2013* -
## Math

What is the relationship between the side length and the apothem of an equilateral triangle?

*asked on July 13, 2015* -
## physics

a stone is projected upward with a speed of 80.0ft/s from a 224 ft tower. find the maximum height and the speed at which it strikes the ground.

*asked on June 21, 2014* -
## Chemistry

Balanced Chemical Equation: 1 N204(l) + 2 N2H4(l) --> 3 N2(g) + 4 H20(g) If you start with: 5.0 x 10^4g hydrazine (N2H4) "in the tank": 1) How many moles of nitrogen can be created (assuming 100% yielded)? 2) How many moles of water can be produced? 3)

*asked on November 19, 2010* -
## Chemistry

The voltaic cell described by the cell notation has a standard emf (electromotive force) of 0.94 V. Calculate the value (J) for the maximum electrical work that the cell can do under standard conditions. Round your answer to 3 significant figures. Pt(s) /

*asked on December 3, 2010* -
## chemistry

What is the electron configuration for Be 2+ ions? 1) 1 3) 2-1 2)2 4) 2-2 I also need an explanation for the correct and incorrect answers because I am confused by this problem.

*asked on November 6, 2008* -
## Managerial Economics

When McDonald’s Corp. reduced the price of its Big Mac by 75 percent if customers also purchased french fries and a soft drink, The Wall Street Journal reported that the company was hoping the novel promotion would revive its U. S. sales growth. It

*asked on October 31, 2010* -
## Physics

A large rock weighing 164N is suspended from a 3 meter wire. The density of the rock is rho_rock = 3200 kg/m^3, and the wire mass is negligible. The upper end of the wire is fixed; in air the frequency is 40Hz while in liquid the frequency would be 25Hz.

*asked on June 13, 2018* -
## Chemistry

The electrochemical cell described by the balanced chemical equation has a standard emf (electromotive force) of -0.35 V. Calculate the value (J) for the Wmax that the cell can do under standard conditions. Round your answer to 3 significant figures.

*asked on December 3, 2010* -
## AP BIOLOGY

I have a quiz on genetics on friday in AP Biology and I would like some sites with good ap biology questions on them. I don't know any of them which I could go to.

*asked on December 3, 2008* -
## Calculus

An explosion causes debris to rise vertically with an initial velocity of 160 feet per second. In how many seconds does it attain maximum height? i know i need to use the formula: y(t)=-16t^2+Vot + yo Have: vo=160 Yo= is what i am trying to find and i dont

*asked on February 23, 2017* -
## economics

data collected in the imaginary economy of karabekiar reveals that when price of bork increased by 20%, the quantity of bork sold decreased by 15% and the quantity of perf demanded decreased by 10% what is the cross-price elasticity of demand between perf

*asked on February 7, 2013* -
## Physics

1. If a bar magnet is broken into two pieces, how many magnetic poles are there? 2. A long straight wire carries a current in the direction shown in the following figure. At the point labeled A, is the direction of the magnetic field left, right, up. Down,

*asked on October 29, 2012* -
## chemical question

a) Sour milk pancakes do not taste sour when sour milk and baking soda are substituted for sweet milk and baking powder . Explain. b) How would these pancakes taste if sour milk and baking powder are used? c) How would they taste if sweet milk and baking

*asked on October 23, 2011* -
## calculus

Find lim f(x) for f(x)=Ix-3I/x-3 x->3

*asked on September 19, 2011* -
## Algebra

John wants to build a corral next to his barn. He has 300 feet of fencing to enclose three sides of his rectangular yard. a. What is the largest area that can be enclosed? b. What dimensions will result in the largest yard?

*asked on September 20, 2010* -
## physics

how long will it take the sound of the starting gun to reach the ears of the sprinters if the starter is stationed at the finish line for a 100 meter race? assume that the sound has a speed of about 340m/s.

*asked on October 5, 2014* -
## Probability

If three people are randomly selected, find the probability that they will all have birthdays on the same day of the year.

*asked on June 25, 2015* -
## Mathis

Fiona is dissatisfied with her current weekly salary. If she received a raise of $0.50 per hour and worked an additional 4 hours each week her weekly salary would then be $500. What is Fiona current salary a) $380 b)$400 c)$420 d)440 e) not e ought

*asked on August 21, 2013* -
## biology

27. Pretend you are a carbon atom that was part of a molecule of CO2 dissolved in the water at the beginning of the experiment. Describe a path you could take through both organisms in this experiment, including the molecules you would be a part of and the

*asked on February 23, 2013* -
## physics

A car traveling east at 42.4 m/s passes a trooper hiding at the roadside. The driver uniformly reduces his speed to 25.0 m/s in 4.00 s. (a) What is the magnitude and direction of the car's acceleration as it slows down?

*asked on August 29, 2012* -
## calculus

Find the derivative of the given function. Simplify and express the answer using positive exponents only. y= ((9x^2-4)^3/7x^2+4)

*asked on September 19, 2011* -
## Chem

How many moles of NaOH would you need to add to 800 ml of a 0.4 M H2CO3 solution in order to bring the pH of the solution to 10.5?

*asked on February 6, 2011* -
## physics

An infinitely long thin metal strip of width w=12cm carries a current of I=10A that is uniformly distributed across its cross section. What is the magnetic field at point P a distance a=3cm above the center of the strip as shown? This one requires some

*asked on April 7, 2014* -
## Chemistry

Balanced Chemical Equation: 1 N204(l) + 2 N2H4(l) --> 3 N2(g) + 4 H20(g) If you start with: 5.0 x 10^4g hydrazine (N2H4) "in the tank": 1) How many moles of nitrogen can be created (assuming 100% yielded)? 2) How many moles of water can be produced? 3)

*asked on November 19, 2010* -
## Algebra

Write the polynomial function as a product of linear factors. 6x^4-7x^3-10x^2+17x-6

*asked on October 6, 2010* -
## college

cos 23pi/12

*asked on April 26, 2010* -
## Math

3 questions if you can help me. 1. Calculate the number of subsets and the number of proper subsets for the set. {x|x is a day of the week} 2. Let U = {q, r, s, t, u, v, w, x, y, z} A = {q, s, u, w, y} B = {q, s, y, z} C = {v, w, x, y, z}. List the

*asked on June 9, 2011* -
## statistics

the average act score submitted to a certain university is 26. to be eligible for admission, a student must score in the top 6% of applicants. if the scores are normally distributed with a standard deviation of 2.4, what is the minimum score needed to be

*asked on March 21, 2014* -
## science

According to Newton's second law of motion, _____? A. F = mv B. F = m/a C. a = Fnet /m D. F = ma I think it is B..?

*asked on March 14, 2013* -
## physics

A ball is thrown vertically upward with a speed of 19.0 m/s. (a) How high does it rise? m (b) How long does it take to reach its highest point? s (c) How long does the ball take to hit the ground after it reaches its highest point? s (d) What is its

*asked on August 30, 2012* -
## statistics

Suppose the average body temp is 98.6 assume the variable is normally distributed with a standard deviation of .74 degrees. suppose a sample of 100 is taken. what is the probability that the mean is below 98.4??? Between 98.5 AND 98.7??

*asked on March 21, 2014* -
## Chem

How many moles of NaOH would you need to add to 800 ml of a 0.4 M H2CO3 solution in order to bring the pH of the solution to 10.5?

*asked on February 6, 2011* -
## precalc

use the sum to product formula to simplify sin 42degrees+sin 18 degrees=sin A degrees 0

*asked on April 1, 2016* -
## Math

the number of blocks has 9 in the ones place. The number in the hundreds place is one more than the number in the tens place. Those two numbers equal 11. how many blocks are there.

*asked on December 7, 2015* -
## Chemistry

Given 1.01 g of H2 in the reaction H2 + 1/2 O2 = H2O. The Delta H for solution is 143 kJ. What is the delta H for the reaction?

*asked on October 20, 2012* -
## Math

Because of a recession, the value of a new house depreciated 10% each year for 3 yr in a row. Then, for the next 3 yr, the value of the house increased 10% each year. Did the value of the house increase or decrease after 6 yr? Explain. I feel that the

*asked on February 6, 2011* -
## physics

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 795 m/s. The barrel is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.042 m below the center. What is the horizontal distance between the

*asked on October 13, 2010* -
## Astronomy

Suppose that, in the future, observations with some new telescope reveal a planet about 16 AU from a star whose mass is the same as our sun's mass. How long does it take the planet to orbit the star? Use Keplers law. You know at 1AU the period is 365

*asked on April 3, 2007* -
## Geology science

Describe any difference between the amounts of water that would percolate downward to the saturated zone beneath a flat meadow in northern New York and a rocky hillside in southern Nevada. Discuss the factors that control the amount of percolation in each

*asked on March 30, 2011* -
## The scarlet letter- amer lit

I have to write an essay for english here is the topic: Identify the protagonist: The critic Randal Stewart has this is say about Hester and Dimmesdale: ..."But hester is not the protagonist,the chief actor,and the tragedy of the scarlet letter is not her

*asked on October 9, 2010* -
## biology

Apply the concept of RESPIRATION. What happens inside of a human being when he or she eats various foods? During Respiration, is the energy in the food converted into heat, or into some other chemical (name the chemical!)

*asked on March 1, 2013* -
## Chemistry

"You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 165.0 ppm and is initially uniform through the thickness of the

*asked on December 15, 2012* -
## Math

3 questions if you can help me. 1. Calculate the number of subsets and the number of proper subsets for the set. {x|x is a day of the week} 2. Let U = {q, r, s, t, u, v, w, x, y, z} A = {q, s, u, w, y} B = {q, s, y, z} C = {v, w, x, y, z}. List the

*asked on June 9, 2011*