# ann

Popular questions and responses by ann-
## Physics

A football player of mass 103 kg running with a velocity of 2.0 m/s [E] collides head-on with a 110 kg player on the opposing team travelling with a velocity of 3.2 m/s [W]. Immediately after the collision the two players move in the same direction.

*asked on December 13, 2017* -
## Math

Drawing a least one king when you draw a card from a standard deck 8 times (replacing the card each time you draw, so there are always 52 cards in the deck) P(at least one king in 8 attempts)= [P(1 king + 2 kings + 3 kings + 4 kings]^8 = 1/52 + 2/52 + 3/52

*asked on November 7, 2015* -
## Physics

A 15 kg block is on a ramp which is inclined at 20 degrees above the horizontal. It's connected by a string to a 19kg mass which hangs over the top edge of the ramp. With no frictional forces taken into account, what is the magnitude of the acceleration of

*asked on November 9, 2017* -
## cellular solids

Calculate the Young's modulus and compressive strength for: a) 5% dense aluminum regular hexagonal honeycomb, loaded in the out-of-plane direction, x3 b) 5% dense aluminum regular hexagonal honeycomb, loaded in the in-plane direction, x2 c) 5% dense

*asked on February 25, 2017* -
## cell biology

What is the mass of 2.00 L of an intravenous glucose solution w/ a density of 1.15 g/ml?

*asked on February 25, 2011* -
## college physics

A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.860 m/s encounters a rough horizontal surface of length = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.355 and he exerts a

*asked on November 21, 2011* -
## Physics

A squid can propel itself by taking water into its body and then expelling it. A 0.60 kg squid expels 0.30 kg of water with a velocity of 20 m/s [S]. What is the speed of the squid immediately after expelling the water?

*asked on December 13, 2017* -
## Math

The sides of a rectangle are in the ratio 2:5. The perimeter of the rectangle is 70cm. What is the Width of the the rectangle.

*asked on January 4, 2012* -
## Math

A play has two roles for men and four roles for women if five men and 12 women tryout for these parts,in how many different ways can the director choose people for the roles

*asked on March 8, 2017* -
## Math

The equation V=1/3 Bh gives the volume V of a pyramid, where B is the area of the base and h is the height. Solve this equation for B. Please help me and show your work thanks

*asked on February 16, 2012* -
## Math(simple interest)

A person borrows two equal sums of money at the time at 5% and 3.75% simple interest respectively & finds that if he repays the former sum a year before the latter the amount paid in each case is the same that is Rs.736. Find the total sum borrowed.

*asked on January 8, 2017* -
## Physics

Two gliders on an air track collide in a perfectly elastic collision. Glider A has mass 1.1 kg and is initially travelling at a velocity of 2.7 m/s [E]. It collides head-on with glider B with mass 2.4 kg, travelling at a velocity of 1.9 m/s [W]. Determine

*asked on December 13, 2017* -
## Geometry

A secant and a tangent to a circle intersect in a 42 degree angle. The two arcs of the circle intercepted by the secant and tangent have measures in a 7:3 ratio. Find the measure of the third arc. If someone could help me figure out how to do the

*asked on February 11, 2015* -
## Math

What is the net price factor for trade discounts of 25/15/10? Answer: .57375 Just checking my homework answers

*asked on May 20, 2013* -
## English

just can't figure these sentences out. have to rewrite these sentences, correcting the problem of incorrect omission.? 1. A liberal arts background is excellent for such professions as lawyers and doctors. 2. American colleges consistently produce more

*asked on March 19, 2011* -
## math

If it has been determined that the probability of an earthquake occurring on a certain day in a certain area is 0.05, what are the odds against an earthquake? multiple choice A) 20 : 1 B) 1 : 20 C) 18 : 1 D) 19 : 1 3

*asked on October 11, 2009* -
## forensic

__________________ appear to match in one set of lighting conditions, but not in another. Dyes Pigments Metameric colors Simultaneous contrast colors Fluorescent fibers

*asked on July 21, 2017* -
## algebra Please help

.A toy rocket is shot vertically into the air from a launching pad 5 feel above the ground with an initial velocity of 72 feet per second. The height h, in feet, of the rocket above the ground as t seconds after launch is given by the function

*asked on June 2, 2015* -
## Dudas

John's mass is 86 kg, and Barbara's is 55 kg. He is standing on the x axis at xj = +9.0 m, while she is standing on the x axis at xb = +2.0 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch?

*asked on October 29, 2014* -
## chemistry

A solution contains 2 mEq/ml of KCL (Molecular weight 74.5). If a 20 ml ampule of this solution is diluted to 1 liter what is the percent strength of the resulting solution?

*asked on February 21, 2013* -
## MEC

two charges repel each other with a force of 0.1N when they are 5cm apart. Find the forces between the same charges when they are 2cm and 8cm apart.

*asked on October 24, 2012* -
## algebra

The intensity I of light bulb measured in watts per square meter (w/m^2), varies inversely as the square of the distance d from the light bulb . . suppose I is 45 w/m^2 when the distance is 5 m . find the intensity when the distance from the light bulb is

*asked on May 15, 2015* -
## math

The derivative of f(x) = x^4/3 - x^5/5 attains its maximum value at x =

*asked on December 27, 2011* -
## Business Math

What amount must be paid to settle an invoice of $1200 dated Nov.28 , terms 3/10, n/30 if the invoice is paid on Dec. 3? I got $1164. Am I right? Thanks

*asked on April 15, 2011* -
## maths help

Please could you answer my question

*asked on January 3, 2018* -
## Physics

A tennis ball with mass 57 g is travelling at 25 m/s [S] when it is intercepted by a tennis racquet for 4.0 ms after which the ball travels at 32 m/s [N]. What is the impulse imparted by the tennis racquet?

*asked on December 13, 2017* -
## forensic science

Why is the cross section of a fiber important? it is a distinctive trait of only natural fibers It is a distinctive trait of only synthetic polymer fibers it can vary significantly with the fiber it provides athe basis for the Beck line it determines the

*asked on July 20, 2017* -
## maths

A sculpture needs to lift a piece of marble.it is a cuboid with dimensions 1m by 0.6m and 0.3m.marble has a density of 2.7. work out the mass.

*asked on January 3, 2018* -
## Physics

A beam of particles have a measured life time of 1.5 x 10-8 s when traveling 2.0 x 108 m/s. What would their lifetime be if they were at rest? My Answer: tm= tp/√(1-(v2/c2)) (1.5*10-8) = tp/√(1-((2*108)2/(3*108)2)) (1.5*10-8) =

*asked on December 14, 2010* -
## trig

please help me. use trig. identities to find the exact value. tan 25° + tan 5° / 1- tan 25° tan 5°

*asked on April 30, 2010* -
## Physics

An electron is projected into a uniform electric field E = (1000 N/C)i with an initial velocity (2.00* 10^6m/s)i in the direction of the field. How far the electron travel before it is brought momentarily to rest?

*asked on January 26, 2020* -
## Calculus

Why does 2ln6 - 2ln3 = ln4?

*asked on May 5, 2014* -
## English

Choose the correct sentence pattern for the sentences below? 1) There is good reason to be thankful. 2) The President sent the ambassador an invitation to the meeting. 3) Snow skiing is a very exciting sport. 4) I hereby declare Tuesday Shakespeare Day.

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

The perfect paving company charges $10 per square foot to install interlocking paving stones, as well as a $40 delivery fee. Determine the greatest area andrew can pave for $3500.

*asked on September 14, 2019* -
## Physics test review

A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s Find the

*asked on November 8, 2014* -
## chemistry... HELP !!!!!!!

For the reaction 2Co^3+ (aq) + 2Cl^- (aq) ----> 2Co^2+ + Cl2 (g) E^o = 0.46 V (STANDARD cell potential) what is the cell potential at (25 deg C) if the concentrations are [Co^3+] = 0.651M , [Co^2+]= 0.846 M, and [Cl^-] = 0.636 M and the pressure of Cl2 is

*asked on November 5, 2012* -
## Statistics

The probability that a radish seed will germinate is 0.6. Estimate the probability that of 130 randomly selected seeds, exactly 90 will germinate. Note: I keep getting the answer wrong.

*asked on July 20, 2012* -
## Algebra: Help Please

For the given function, compute the missing values in the following table. f(x) = 8x i got the negatives wrong, but I know how to solve for it. Is there a reason it is wrong? -3: -1/512 -2: -1/64 -1: -1/8 (^These were wrong, but I don't know how to solve

*asked on February 23, 2012* -
## physics

A dockworker loading crates on a ship finds that a 20 kg crate, initially at rest on a horizontal surface, requires a 73 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 50 N is required to keep it moving

*asked on December 7, 2011* -
## statistics

a study of the time spent shopping in a supermarket for a market basket of 20 specific items showed an approximately uniform distribution between 20 minutes and 40 minutes. What is the probability that the shopping time will be a) between 25 and 30

*asked on January 6, 2011* -
## algebra

The circle has a circumference of 50.24. Using 3.14 to approximate piâ€‹, find the value of x. â€ƒâ€ƒâ€ƒâ€ƒâ€ƒâ€ƒA circle with a radius labeled x plus 3. x + 3

*asked on May 7, 2018* -
## forensic science

Identification is the examination of chemical and physical properties of an object and using the results to categorize the object as a member of a group. Which of the following are examples of identification? Determination that hairs found on a bag are

*asked on May 31, 2017* -
## Math

If you flip three fair coins, what is the probability that you'll get a head on the first flip, a tail on the second flip, and another head on the third flip?

*asked on April 15, 2017* -
## Business communication

Reserving this property requires a $500 security deposit , which will be refunded unless there is damage to the property or evidence that there is damage to the property or evidence that there has been smoking in the cottage or a pet on the premises or if

*asked on January 30, 2017* -
## Chemistry

E=hv E=energy h= Planck's constant =6.626 x 10^-34 v= frequency 1. What is the energy of light having a frequency of 2.28 x 10^12? ( I do have an answer for this but I'm not so sure about it.) 2.What is the energy of light with a wavelength of 2.18 x

*asked on December 3, 2014* -
## math

Find last years salary if after a 3% pay raise this years salary is $35,020

*asked on October 23, 2013* -
## 205

The Death Penalty Should Not Be Abolished "Capital punishment produces a strong deterrent effect that saves lives." Muhlhausen argues that capital punishment should not be abandoned because it deters crimes, saves lives, and the majority of American

*asked on October 2, 2009* -
## math

1/2÷5/8

*asked on April 12, 2018* -
## Psychology

which of the following is a possible statistically significant outcome from a 2x2 factorial design. A. The other three choices are all possible outcomes . B. Two main effects and an interaction . C. no main effect for either factor but an interaction D.

*asked on April 11, 2017* -
## math

Chuck has $6.00 and he spends 1/5 of his money on candy. How much does he have left?

*asked on October 19, 2015* -
## chemistry

Hello, Please help me with this question! Which dilution would turn 10% (by mass) HCl solution into 0.100 M HCl solution? Density of 10% HCL = 1.08 g ml^-1

*asked on July 23, 2014* -
## Pre-Calculus

Let f(x) be the function 1/(x+9). Then the quotient [f(5+h)−f(5)]/h can be simplified to −1/(ah+b). What does a and b equal to? So I understand the overall concept, and did f(5+h) = 1/(14+h) and f(5) = 1/14. Then to subtract the two, you get the common

*asked on October 18, 2013* -
## Chemistry

Which of the following combinations would require an electrolytic cell? coat aluminum onto iron coat iron onto lead coat copper onto tin coat calcium onto iron Please help.

*asked on May 3, 2012* -
## Chemistry

Sodium oxide, reacts with water to give NaOH. A) Write a balance equation? B)What is the pH of the solution prepared by allowing 1.55 g of Na2O to react with 500.0 ml of water? (assume there is no volume change) C) How many milliliters of 0.0100M HCL are

*asked on November 21, 2010* -
## English

Need to label the verb wish A for action of L for Linking... 1. The koala bears have climbed the tree. Answer=A 2. The peacock seemed more beautiful than before. Answer=A 3. In the rain forest display at the zoo, the birds looked stange and exotic.

*asked on March 28, 2011* -
## Physics

A circuit consisting of three resistance 12ohm, 18ohm and 36ohm respectively joined in parallel, and connected in series with the fourth resistance. The whole circuit is supplied at 60volts and it is found that the power dissipated in the 12 resistance is

*asked on July 8, 2019* -
## math

Each number cube has 6 faces numbered 1-6. John tossed 2 number cubes several times and added the numbers each time. Sum of the number of cubes total tally number of times 2 1 ? 7 4 ?

*asked on December 11, 2017* -
## forensic science

"In fluorescence microscopy, the wavelength of the emitted light is __________that of the exciting radiation." Longer than Shorter than Equal to Either longer or shorter than Impossible to determine My answer is Longer than am I correct

*asked on June 8, 2017* -
## Chemistry

A syrup is added to an empty container with a mass of 104.70 g . When 0.140 pint of syrup is added, the total mass of the container and syrup is 150.01 g . (1 qt = 2 pt) 0.140 pint= 66.2 mL 150.01g mass container and syrup 104.70g mass empty container

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

Dissolving solid CaCl2 H2O in a large volume of water is endothermic to the extent of 14.6 kj/mol. Also given: CaCl2(s)+6H2O(l)->CaCl2* 6H2O(s) delta H = -97.0 kj what is the heat of solution of anhydrous CaCl2 in a large volume of water?

*asked on March 17, 2014* -
## statistics

Us travel data center survey of 1500 adults found that 42% of respondents stated that they favor historical sites. Find the 95% confidence interval of the true proportion of all adults who favor visiting historical sites.

*asked on March 25, 2013* -
## Physics HELP!!

Three point charges have equal magnitudes, two being positive and one negative. These charges are fixed to the corners of an equilateral triangle. The magnitude of each of the charges is 3.66 μC, and the lengths of the sides of a triangle are 2.15 cm.

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

How much force is the air exerting on the front surface of the book with dimensions 19 x 27 cm. Assume atmospheric pressure equal to 100,000 Pa.

*asked on April 12, 2011* -
## physics

A ventilation fan has blades 0.25 m in radius rotating at 20rpm. What is the tangential speed of each blade tip? i don't understand how to do tangential speed.

*asked on January 11, 2011* -
## Gen Chem

What are the net ionic equations for: 1. Potassium Fluoride and Ammonium Chloride and 2. Sodium Hydrogen Sulfite and Potassium Cyanide?

*asked on March 28, 2011* -
## math

I need a picture to be 38mm X 50mm how do I figure this size in inches?

*asked on September 16, 2008* -
## statistics

The Academy of Orthopedic Surgeons states that 80% of women wear shoes that are too small for their feet. A researcher wants to be 98% confident that this portion is within 3% of the true proportion. How large a sample is necessary?

*asked on April 2, 2008* -
## math

A computer password is required to be 5 characters long. How many passwords are possible if the password requires 2 letter(s) followed by 3 digits (numbers 0-9), where no repetition of any letter or digit is allowed?

*asked on May 23, 2020* -
## Physics

Three charges lie along the x-axis. The positive charge, q1 = 15 µC, is at x= 2.0 m, and The positive charge, q2 = 6.0 μC, is at the origin. At what point on the x-axis must a negative charge, q3 , be placed so that the net force acting on it is zero?

*asked on January 25, 2020* -
## MATH

WHICH SHOWS THE GCF OF 18 AND 24 WITH 18/24 IN SIMPLEST FORM

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

Which statement is true when considering color in a fiber? the color is measured using an FTIR the color depends upon the lighting source the color is always a result of a pigment in all fibers there are very few color dyes that can be used for fibers none

*asked on July 21, 2017* -
## MICROBES AND SOCIETY

Which of the following applies to the adenoviruses a. cause high fever, sore throat, and severe cough. b. The viruses are involved in liver diseases. c. Most adenoviruses are transmitted by contaminated arthropods. d. The viruses have a close association

*asked on April 24, 2017* -
## Research 1

which of the following is a possible statistically significant outcome from a 2x2 factorial design. A. The other three choices are all possible outcomes . B. Two main effects and an interaction . C. no main effect for either factor but an interaction D.

*asked on April 11, 2017* -
## Chemistry

For the following chemical reaction HCN(aq)+KOH(aq)--->H2O(l)+KCN(aq) Write the net ionic equation, including the phases.

*asked on April 3, 2016* -
## FIN3373

ST. Luke's Convalescent Center has $200,000 in surplus funds that it wishes to invest in marketable securities. If transaction costs to buy and sell the securities are $2,200 and the securities will be held for three months, what required annual yield must

*asked on March 27, 2016* -
## chemistry

At 1500 °C, Kc = 5.67 for the reaction CH4(g) + H2O(g) CO(g) + 3H2(g) Calculated value of ΔG°1773 for the reaction at this temperature.

*asked on March 5, 2016* -
## Algebra

The focal length of the lens of the camera is 1/4 meter, and Sarah is 1/2 meter from the camera lens. What is the distance of the image from the lens?

*asked on January 28, 2016* -
## Geometry

2 sides of an equilateral triangle measure (y+10) units and (y^2-2) units. If the perimeter of the triangle is 21 units, what is the value of y? I was trying (y+(y+10) + (y^2-2)=21 got to y^2+2y+-13 and wasn't sure how to proceed. Or should I take a side

*asked on October 19, 2015* -
## Reading and writing skills

A sentence is a group of words expressing a complete thought and each will begin with a capital letter?trueor false?

*asked on September 16, 2015* -
## COLLEGE MATH

a manufacture of brand A jeans has daily production costs of C =0.2x^2 -96x+12,095 where C is the total cost in dollars and x is the number of jeans produced. How many jeans should be produced each day in order to minimize costs? what is the minimum daily

*asked on June 7, 2015* -
## algebra

A private plane traveled from Seattle to the rugged wilderness at a average speed of 176 mph. on the return trip the average speed was 308 mph. if the total traveling time was 5 hours. How far is Seattle to the wilderness? please help

*asked on May 14, 2015* -
## Psychology

If science depends on observation of empirical data, how can social scientists study nonobservable phenomena, such as thought patterns or imagery?

*asked on January 16, 2015* -
## science

How much latent heat is needed to completely melt 368 gram ice cube?

*asked on January 14, 2015* -
## Calculus

Use the Laws of logarithms to rewrite the expression log(1000000x^19)in a form with no logarithm of a product, quotient or power. After rewriting we have log(1000000x^19)= A + Blog(x)? I know B = 19, but what's A?

*asked on May 18, 2014* -
## Chemistry

What is the percent KCL by mass in a 3.00 molal solution?

*asked on March 17, 2014* -
## biostatistics

Seventeen people has been exposed to a particular disease. Each one independently has a 40% chance of contracting the disease. A hospital has the capacity to handle 10 cases of the disease. What is the probability that the hospital's capacity will be

*asked on February 5, 2014* -
## Pre-Calculus

Consider the chemical reaction aC2H6 + bCO2 + cH2O → dC2H5OH, where a, b, c, and d are unknown positive integers.? The reaction must be balanced; that is, the number of atoms of each element must be the same before and after the reaction. For example,

*asked on December 4, 2013* -
## Chemistry

Are these reactions Exothermic or Endothermic? How do I know? 1.) Mg(OH)2(s)Mg+2(aq) + 2OH-(aq) Saw solution lighten from medium pink to very light when heated in hot water bath. (It had phenolphthalein drop for indicator.) 2.) HSO4-(aq)+

*asked on July 11, 2013* -
## statistics

My mean is 175.5 My standard deviation is=90.57 Sample=25 Formula to be used: P(X>190)=P((X-mean)/s sqrt of my sample is = 5 (Which is the square root of 25.) (190-175.5) / 90.57/5) 14.5/18.114 calculator says 0.8004858120790548746825659710721 I check the

*asked on May 27, 2013* -
## statistics

Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends

*asked on May 27, 2013* -
## MATH - PLEASE HELP

A biased coin is tossed 5 times where p(t) = .6. determine the probability that if you have 2 tails, you have 3 tails.

*asked on May 25, 2013* -
## Math

Natureland Garden Center buys lawn mowers that list for $679.95 less a 30% trade discount. What is the dollar amount of the trade discount? Answer: 203.99 What is the net price of each Natureland Garden Center lawn mower? Answer: 475.96 Just want to make

*asked on May 20, 2013* -
## Math

By what percent is a 100-watt light bulb brighter than a 60-watt light bulb? Round to the nearest tenth. 40/60 = 2/3 = 2 ÷ 3 = 0.666667 0.666667 x 100 = 66.6667% Answer: 66.7% Is this correct?

*asked on May 13, 2013* -
## Math

Is this the correct numerical expression for 15 less than one-ninth of P? 15-1/9 P

*asked on May 1, 2013* -
## physics ..PLEASE HELP ASSIGN DUE SOON :(

Three charges, q1=+45.9nC q2=+45.9nC and q3=+91.8nC are fixed at the corners of an equilateral triangle with a side length of 3.70cm. Find the magnitude of the electric force on q3.

*asked on October 19, 2012* -
## chemistry

what is the molecular geometry of niacin? C6H5NO2

*asked on March 2, 2012* -
## macroeconomics

Suppose that there are three beachfront parcels of land available for sale in Asilomar and six people who would each like to purchase one parcel. Assume that the parcels are essentially identical and that the minimum selling price of each is $600,000. The

*asked on February 8, 2012* -
## 6th grade math

There are three crowns in the royal cabinet: One for the King, One for the Queen, and one for the Princess. The king's circumference was 21.98 in, the Queen's circumference was 43.96 cm and the Princess' circumference as 392.5 mm. What are the Diameters's

*asked on April 27, 2011* -
## English

There is a host of reasons... or There are a host of reasons.... Which is correct?

*asked on November 20, 2010* -
## Calculus

Solve for x where 12^x = (4)8^2x

*asked on April 20, 2010*