# Catherine

Most popular questions and responses by Catherine-
## Physics

An Alaskan rescue plane drops a package of emergency rations to a stranded party of explorers. The plane is traveling horizontally at 40.0 m/s at a height of 100 m above the ground. a) How far horizontally from the dropping point does the package strike

*asked on November 1, 2010* -
## Calculus (urgent!!)

A particle moves with its position given by x=cos(2t) and y=sin(t), where positions are given in feet from the origin and time t is in seconds. A)Find the speed of the particle. Speed = ____________ (include units) B)Find the first positive time when the

*asked on April 15, 2011* -
## Calculus (pleas help!!!)

Consider the parameterization of the unit circle given by x=cos(4t^2−t), y=sin(4t^2−t) for t in (−InF, INF). Describe in words and sketch how the circle is traced out, and use this to answer the following questions. (a) When is the parameterization

*asked on April 15, 2011* -
## calculus

A trough is 9 feet long and 1 foot high. The vertical cross-section of the trough parallel to an end is shaped like the graph of y=x4 from x=−1 to x=1 . The trough is full of water. Find the amount of work in foot-pounds required to empty the trough by

*asked on January 29, 2015* -
## Chemistry

Which of the following transition metal ions has a color? Cr3+ , hg2+, v2+ How can you predict that? I don't understand!!

*asked on October 14, 2012* -
## chemistry

a 500.0 mL gas sample at STP is compressed to a volume of 300.0 ml and the temperature is increased to 35.0 C. What is the new pressure of the gas in pascals?

*asked on March 16, 2010* -
## Algebra

Dale invested his savings in two investment funds. The $12,000 that he invested in Fund A returned a 1% profit. The amount that he invested in Fund B returned a 6% profit. How much did he invest in Fund B, if both funds together returned a 3% profit?

*asked on March 20, 2017* -
## Social studies

What is one major similarity between judaism and zoroastrianism? A. Both are based on the idea of a covenant with god. B. Both state that each individual has free will to do good or evil C. Both stress of the importance of judgement day and an afterlife D.

*asked on September 30, 2016* -
## physics

The shock absorbers in the suspension system of a car are in such bad shape that they have no effect on the behavior of the springs attached to the axles. Each of the identical springs attached to the front axle supports 294 kg. A person pushes down on the

*asked on October 17, 2012* -
## Physics

A 0.32 kg box of macaroni is held in place at the front of a 3.31 kg shopping cart only by the force of static friction as the shopping cart accelerates. Determine the minimum acceleration, in m/s 2, that the shopping cart must have if the box is to be

*asked on April 21, 2016* -
## Calculus II

Assume that the rate of change of the unit price of a commodity is propirtional to the difference between the demand and the supply, so that dp/dt = k(D-S) where k is a constant of proportionality. Suppose that D = 72-5p, S = 9 + 2P, and p(0) = 2. Find a

*asked on October 6, 2017* -
## Calculus II

Suppose a cell of volume V cc is surrounded by a homogeneous chemical solution of concentration C g/cc. Let y denote the concentration of the solute inside the cell at any time t and suppose that, initially, the concentration is y0. Fick's law, named after

*asked on October 7, 2017* -
## math

in greatest to least what is 0.1 0.125 and 0.12? i cant figure it out i think you need to convert to fractions im just not sure.

*asked on February 22, 2016* -
## Calculus (pleas help!!!)

A) If x^2+y^3−xy^2=5, find dy/dx in terms of x and y. dy/dx=________ B) Using your answer for dy/dx, fill in the following table of approximate y-values of points on the curve near x=1 y=2. 0.96 ______ 0.98 ______ 1.02 ______ 1.04 ______ C) Finally, find

*asked on March 16, 2011* -
## Chemistry

What's is the concentration of silver ions in a saturated solution of silver carbonate? The k^sp of Ag2CO3 is 8.1x10^ -12. Is the answer 5.88x10^-8? I have a test tomorrow and I really need to make sure I'm doing these problems right, but I feel like I am

*asked on May 9, 2013* -
## Business 101

1. Carmen Santiago works for a number of businesses as a “consultant.” She has helped design accounting systems, provided accounting services, and analyzed the financial strength of her clients’ businesses. Carmen is working as a A. public

*asked on November 17, 2013* -
## chemistry

A 24L sample of a gas at fixed mass and constant temperature exerts a pressure of 3.0 atm. What pressure will the gas exert if the volume is changed to 16L?

*asked on March 16, 2010* -
## Physics

A particular Ferris wheel takes you through one complete revolution every 25.3 seconds. If the radius of the Ferris wheel is 10.4 m, and your mass is 63.3 kg, calculate: (a) Your apparent weight, in N, when you are at the top of the Ferris wheel. (b) Your

*asked on April 21, 2016* -
## Physics

A wet bar of soap slides down a ramp 9.4 m long inclined at 8.0âˆ˜ . How long does it take to reach the bottom? Assume Î¼k = 0.064.

*asked on October 22, 2015* -
## Life Orientation

Identify and explain five recommendations to address teenage pregnancy

*asked on August 10, 2019* -
## Physics

A 410 kg race car is rounding a curve in the road which is banked at an angle of 23.4 degrees from the horizontal. Assume that there has just been a massive snowfall and the road’s surface is frictionless. What must the radius of the curve be if the car

*asked on April 21, 2016* -
## Calculus

Let F(a) be the area between the x-axis and the graph of y=x^2cos(x/4) between x=0 and x=a, for a>0 (consider the area to be negative if the graph lies below the axis). Find the formula for F(a).

*asked on September 14, 2011* -
## Physics

The acceleration of a particle moving only on a horizontal xy plane is given by , where is in meters per second-squared and t is in seconds. At t = 0, the position vector locates the paticle, which then has the velocity vector . At t = 3.60 s, what are (a)

*asked on February 3, 2014* -
## physics

If Michael Jordan has a vertical leap of 1.29 m, then what is his takeoff speed and his hang time?

*asked on November 1, 2010* -
## Geography

What are some major landforms by Wichita Falls, Texas?

*asked on August 30, 2011* -
## Mechanics

A tension test was performed on a steel specimen having an original diameter of 12.5 mm and gauge length of 50 mm. Using the data listed in the table, plot the stress–strain diagram, and determine approximately the modulus of toughness. Use a scale of 20

*asked on September 10, 2011* -
## Calculus

Let F(a) be the area between the x-axis and the graph of y=x^2cos(x/4) between x=0 and x=a, for a>0 (consider the area to be negative if the graph lies below the axis). Find a formula for F(a).

*asked on September 9, 2011* -
## Chemistry

Consider the decomposition of a metal oxide to its elements where m represents a generic metal. M2O(s)2M(s)+1/2O2(g) the delta G is 10.30 I need to find K and PressureO2 at 298K I know the equations but i keep getting the answer wrong could you please help

*asked on July 12, 2013* -
## Science- Chemistry

How many grams of sodium acetate( molar mass 82.03 g/mol) must me added to 1.00L of a 0.200M acetic acid solution to form a buffer of 4.20?Ka value for aceic acid is 1.8 x 10^-5. How do I go about finding the grams from the given information?

*asked on June 2, 2007* -
## Calculus

Please help? Let F(a) be the area between the x-axis and the graph of y=x^2cos(x/4) between x=0 and x=a, for a>0 (consider the area to be negative if the graph lies below the axis). Find the formula for F(a).

*asked on September 15, 2011* -
## Calculus II

I'm having trouble getting started. Steve said it's similar to another question I asked but I don't know how to begin. Any help? Suppose a cell of volume V cc is surrounded by a homogeneous chemical solution of concentration C g/cc. Let y denote the

*asked on October 8, 2017* -
## math

at the video store where you work the dvd cases are 5/8 of an inch wide. New shelf units are available that have 6 40-inch shelves. How many dvd should fit on a 6-shelf unit?

*asked on August 13, 2015* -
## Physics

A 570 kg truck is carrying a large 1.9 kg box on its cargo deck when it starts to accelerate. If the coefficient of static friction between the box and the truck’s deck is 0.26, what is the maximum acceleration, in m/s 2, that the truck can have without

*asked on April 21, 2016* -
## chemistry

A common laboratory system to study Boyle's law uses a gas trapped in a syringe. The pressure in the system is changed by adding or removing identical weights on the plunger. The original gs volume is 50.0 ml when two weights are present. Predict the new

*asked on March 16, 2010* -
## Physics Year 7 (Help please)

Isabella drops a chunk of iron of mass m from the roof of her high school and it accelerates at g. Then she ties two chunks of iron together of mass 2m. Show that when she drops the double chunk, the acceleration of fall is also g. Thank you :)

*asked on May 15, 2011* -
## Physics

A powered model airplane of mass 1.7 kg is tied to a ceiling with string and allowed to fly at speed 0.21 m/s in a circular path of radius 0.86 m while suspended by the string which makes a constant angle with respect to the vertical. (a) What is the

*asked on April 21, 2016* -
## Physics

A severe thunderstorm dumped 2.4 in of rain in 30 min on a town of area 35 km2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 103 kg.

*asked on February 2, 2014* -
## physics

A driver is running 3.6 m/s and dives out horizontally from the edge of a vertical cliff and reaches the water below 2.0s later. A) How high was the cliff? B) How far from its base did the driver hit the water?

*asked on December 6, 2010* -
## chemistry

A lab technician determines the boiling point elevation of an aqueous solution of a nonvolatile, nonelectrolyte to be 1.62°C. What is the solution's molality?

*asked on March 3, 2013* -
## MAth

Determine when the Hamilton method gives an Alabama paradox and who lost the representative. Increase the committee size by one seat at a time, starting from an 8-member committee. Given: City A, City B, and City C are cooperating to build a community

*asked on March 26, 2017* -
## Finance

A bond has a $l000 par value, l0 years to maturity, a 7 percent annual coupon, and sells for $985. a. What is its current yield? b. What is its yield to maturity c. Assuke that the yield to maturity remains constant for the next 3 years, what will the

*asked on September 9, 2010* -
## Math

A man standing 20 m from a tower estimates the angle of elavation of the top and bottom of a flagpole on the tower as 58 degrees and 55 degrees. Calculate the height of the flagpole. How would I go about finding the height of the flagpole? Calculate the

*asked on June 2, 2007* -
## Calculus II

Hi, I can't seem to find out how to do this. My textbook has two Q(t) values in the example and I don't know how to interpret this problem. An institute finds that the average student taking Elementary Machine Shorthand will progress at a rate given by

*asked on October 15, 2017* -
## CHECK MY WORLD HISTORY ANSWERS

1 star* at the end of each question and multiple stars*** at the end of my answer 1. Which laws called for strict separation of the races in the South? * anti-discrimination laws Plessy v. Ferguson laws Jim Crow laws**** Boycott Laws 2. All of the

*asked on May 24, 2016* -
## math

This is a floor plan of a building that is 8m tall. It has a flat roof. What is the surface area of the building including the roof. The floor plan is starting from the left the side is 18m the bottom is 27m the right side is 22m. The top looks weird

*asked on September 15, 2014* -
## Calculus

Given a power function of the form f(x)=ax^n, with f'(3) = 14 and f'(6) = 28, find n and a.

*asked on October 8, 2013* -
## Chemestry

A 5.000g sample of a dry mixture of potassium hydroxide, potassium carboate and potassium chloride is reacted with 0.100 L of 2.00-molar HCl solution. A 249.0 mL sample of dry carbon dioxide gas, measured at 22.0 degree Celsius and 740.0 torr, is obtained

*asked on May 13, 2016* -
## Physics

An airplane normally flies at 280 km/h. What is its airspeed if it experiences 80 km/hr headwind?

*asked on October 3, 2010* -
## science

an arrow is fired directly horizontal off a cliff that is 10.0 meters tall with a velocity of 65.5 m/san arrow is fired directly horizontal off a cliff that is 10.0 meters tall with a velocity of 65.5 m/s. How long is the arrow in the air?

*asked on February 2, 2015* -
## Physics (please help)

A planet is in circular orbit about a remote star, far from any other object in the universe. Which of the following statements is true? a. None of the other statements are true. b. There is only one force acting on the planet. c. There are two forces

*asked on April 30, 2011* -
## Basic Algebra

A new cruise ship line has just launched 3 new ships: the Pacific Paradise, The caribbean paradise, and the mediterranean paradise. The carribean paradise has 32 more deluxe stateroooms than the pacific paradise. The Mediterranean paradise has 37 few

*asked on July 16, 2011* -
## Physics

The equation y=25sin(120t-4x) represent a Wave motion.Determine the frequency and period

*asked on April 27, 2019* -
## Physics

An airplane normally flies at 280 km/h. What is its airspeed if it experiences 80 km/hr headwind?

*asked on October 3, 2010* -
## Calculus (please help!!!)

Consider the parameterization of the unit circle given by x=cos(4t^2−t), y=sin(4t^2−t) for t in (−InF, INF). Describe in words and sketch how the circle is traced out, and use this to answer the following questions. (a) When is the parameterization

*asked on April 14, 2011* -
## Science

3 CaSO4 + 2 AlCl3 Al2(SO4)3 + 3 CaCl2 How many moles of aluminum chloride are required to produce 97.0 g of calcuim chloride in the above reaction?

*asked on December 16, 2010* -
## Maths

Two roots of the equation x^3+px+q are -1and 3.The third root is?

*asked on May 30, 2019* -
## Basic Algebra

solve. Cx+Hy=M, for x

*asked on July 12, 2011* -
## Physics

Water is boiled by burning coal. The resulting steam blows agains huge turbine blades. The turning blades spin in a magnetic field, producing electricity. Describe in order the energy conversions.

*asked on March 24, 2014* -
## Calculus

Let F(a) be the area between the x-axis and the graph of y=x^2cos(x/4) between x=0 and x=a, for a>0 (consider the area to be negative if the graph lies below the axis).

*asked on September 10, 2011* -
## Calculus (urgent!!)

A particle moves with its position given by x=cos(2t) and y=sin(t), where positions are given in feet from the origin and time t is in seconds. A)Find the speed of the particle. Speed = ____________ (include units) B)Find the first positive time when the

*asked on April 14, 2011* -
## MATH

Amtrail trains provide efficient, nonstop transportation between Los Angeles and San Diego. Train A leaves Los Angeles headed toward San Diego at the same time that Train B leaves San Diego headed for Los Angeles, traveling on parallel tracks. Train A

*asked on January 12, 2011* -
## 11th grade

the mass of a dog that weighs 100 N how many kilograms does it weigh?

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

Why do my numbers scramble when I post math homework into my classroom forum posting box when I click on post message?

*asked on February 29, 2012* -
## Physic

Two charges of equal magnitude of 2C and mass of 1.0 g are separated by a distance of 3 mm. Find the velocity of one particle when they are separated by a distance of 4mm.

*asked on January 31, 2012* -
## physics

An airplane traveling a constant 100.0 m/s is to drop supplies to flood victims isolated on a patch of land 200.0 m below. A) The supplies should be dropped how many seconds before the plane is directly overhead? B) What is the distance of the plane away

*asked on December 6, 2010* -
## physics

a 650 lb box is hanging by means of two ropes attached to a ceiling as shown by diagram below find the tension on the ropes

*asked on September 6, 2010* -
## Math

Use the Hamilton method of Apportionment to make the assignment. In a recent census, Iowa's population in thousands was 4,503, Illinois' was 8,220, and Indiana's was 5,300. Allocate 31 members of the U.S. House of representatives to these three states.

*asked on March 27, 2017* -
## Science

What two major factors determine the size of a star? Is it a) Gravity and Mass OR b) The force of gravity pulling in trying to make the star as small as possible and the outward pressure from the radiation generated in the core trying to swell it up.

*asked on May 14, 2011* -
## computer assisted legal research part 2

There seems to be 2 answers to #11 of exam #00803701. Not sure which one to use

*asked on May 7, 2014* -
## chemistry

When you add 0.320 g of sodium metal to an excess of hydrochloric acid, you find that 3330 J of heat are produced. What is the enthalpy of the reaction as written below? 2Na(s) + 2HCl(aq) --> 2NaCl(aq) +H2(g

*asked on March 9, 2015* -
## Calculus (please help!!!!)

Consider the parameterization of the unit circle given by x=cos(4t^2−t), y=sin(4t^2−t) for t in (−InF, INF). Describe in words and sketch how the circle is traced out, and use this to answer the following questions. (a) When is the parameterization

*asked on April 14, 2011* -
## Art

Hi- I have to do an Art analysis on 'Diamond Dust Shoes' by Andy Warhol, and am a bit stuck on the part "what do you think the artist was trying to say?" I am in yr 8, and was wondering if anyone had any suggestions :) Thank you!

*asked on February 21, 2011* -
## Math-CHECK PLEASE

Which of the statements is ALWAYS TRUE? A-A right triangle is a scalene triangle. B-An equilateral triangle is an isosceles triangle. C-An isosceles triangle is an obtuse triangle. D-A right triangle is an acute triangle. I got either A or D. I don't know.

*asked on March 8, 2011* -
## Math

Use the Hamilton method of Apportionment to make the assignment. In a recent census, Iowa's population in thousands was 4,503, Illinois' was 8,220, and Indiana's was 5,300. Allocate 31 members of the U.S. House of representatives to these three states.

*asked on March 26, 2017* -
## Algebra

The height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. When graphed, the function gives a line With slope of —0.4. See the figure below. Suppose that the height of the candle after 11 hours is

*asked on March 20, 2017* -
## Physics

A 2 kg block is resting on a 37 degree frictionless inclined plane, attached by a string to a frictionless pulley at the top of the plane, over which a second mass of 3.3 kg hangs down. Find the magnitude of the hanging mass’s acceleration.

*asked on April 21, 2016* -
## Physics

If the fundamental frequency of an 70 cm long guitar string is 470 Hz, what is the speed of the traveling waves?

*asked on February 17, 2014* -
## Physics

For a scene in a movie, a stunt driver drives a 1.50x10^3 kg SUV with a length of 4.35 m around a circular curve with a radius of curvature of 0.333 km. The vehicle is to be driven off the edge of a gully 10.0 m wide, and land on the other side 2.96 m

*asked on May 8, 2011* -
## Physics Question

Here is a demonstration Pascal used to show the importance of a fluid's pressure on the fluid's depth : An oak barrel with a lid of area 0.17 m^2 is filled with water. Along, thin tube of cross-sectional area 4.7×10−5 m^2 is inserted into a hole at the

*asked on May 7, 2011* -
## Calculus (pleas help I really need to check this)

Assume that each of the follwing functions gives the position of an object at time t. Find the velocities indicated by setting up and evaluating a limt algebraically. (a) s(t) = 3t^2, Find v(-1). (b) s(t) = 1/t , Find v(2). (c) s(t) = square root of t,

*asked on February 17, 2011* -
## Physics

Calculate the vertical distance an object dropped from rest would cover in 12s if it fell freely without air resistance.

*asked on November 24, 2010* -
## Maths

if the bearing of N from M is 500 , what is the bearing of M to N?

*asked on June 9, 2019* -
## Economics

In 1997, the price of a particular basket of goods was $2,900. In 1998, the price of the same basket was $3,300. In 1996, the base year, the price of the basket was $2,500. (Hint: price index is price indexed to a base year.) A. Calculate price index for

*asked on March 5, 2017* -
## Physics

A small disc of mass 0.7 kg is attached to a string on a frictionless table top. The string passes through a small hole in the centre of the table and is attached to a mass of 0.68 kg suspended below the table and above the floor. The disc can thus move in

*asked on April 21, 2016* -
## Chemistry

If you reacted 100.0 g of carbon tetrachloride (CCl4) with excess antimony fluoride (SbF3), how many grams of carbon dichloride difluoride would be produced?

*asked on December 11, 2015* -
## physics

A 1.0-m thin rod of aluminum is laid end-to-end with a 1.0-m thin rod of steel. The rods are initially at 25 oC. What is the total length of both rods when heated to 450 oC?

*asked on July 29, 2013* -
## Calculus (urgent!!)

Please answer the following questions about the function f(x)=e^(-0.5x^2) Instructions: If you are asked to find x- or y-values, enter either a number, a list of numbers separated by commas, or None if there aren't any solutions. Use interval notation if

*asked on April 6, 2011* -
## Calculus Please Help

A) If x^2+y^3−xy^2=5, find dy/dx in terms of x and y. dy/dx=________ B) Using your answer for dy/dx, fill in the following table of approximate y-values of points on the curve near x=1 y=2. 0.96 ______ 0.98 ______ 1.02 ______ 1.04 ______ C) Finally, find

*asked on March 15, 2011* -
## Statistics of Psychology

A population of N=6 scores ha EX=12 and Ex squared=54. What is the value of SS for this popluation

*asked on October 28, 2017* -
## Math

A small country consists of seven states; there are 189 seats in the legislature that need to be apportioned among the seven states; and the population of each state is shown, State A: 1283 State B: 2374 State C: 2725 State D: 2155 State E: 1592 State F:

*asked on March 27, 2017* -
## Economics

Total cost and total variable cost are parallel, yet average total cost and average variable cost are not parallel. a. Demonstrate mathematically that ATC and AVC are not parallel. b. Show mathematically that when both ATC and AVC are falling, ATC falls

*asked on October 31, 2011* -
## Math

A small country consists of seven states; there are 189 seats in the legislature that need to be apportioned among the seven states; and the population of each state is shown, State A: 1283 State B: 2374 State C: 2725 State D: 2155 State E: 1592 State F:

*asked on March 26, 2017* -
## Maths

If alpha amd beta are zeroes of polynomial x^2+8x-6 form the polynomial whose zeroes are 1 /2alpha and 1/2beta.

*asked on October 2, 2015* -
## Calculus (pleas help!!!)

Please answer the following questions about the function f(x)=e^(-0.5x^2) Instructions: If you are asked to find x- or y-values, enter either a number, a list of numbers separated by commas, or None if there aren't any solutions. Use interval notation if

*asked on April 5, 2011* -
## Calculus (pleas help!!!)

Please answer the following questions about the function f(x)=e^(-0.5x^2) Instructions: If you are asked to find x- or y-values, enter either a number, a list of numbers separated by commas, or None if there aren't any solutions. Use interval notation if

*asked on April 5, 2011* -
## Calculus

Assume that each of the follwing functions gives the position of an object at time t. Find the velocities indicated by setting up and evaluating a limt algebraically. (a) s(t) = 3t^2, Find v(-1). (b) s(t) = 1/t , Find v(2). (c) s(t) = square root of t,

*asked on February 17, 2011* -
## algebra 2

At a flea market held each weekend, an artist sells handmade earrings. The table below shows the average number of pairs of earrings sold for several prices. Given the pattern in the table, how much should the artist charge to maximize revenue? Table:

*asked on January 4, 2011* -
## chemistry

find the molality of a salt-water solution containing 0.27 mol NaCl in 150 g water.

*asked on April 7, 2013* -
## chemistry

what mass of K2SO4 would you measure out to prepare 350 mL of a .76 M solution? The gram formula mass of K2SO4 is 174.2 g/mol

*asked on April 7, 2013* -
## english

What does this poem mean? (tone, mood, and rhyme scheme) At the Un-National Monument Along the Canadian Border William Stafford This is the field where the battle did not happen, where the unknown soldier did not die. This is the field where grass joined

*asked on May 17, 2012*