# Joe

Popular questions and responses by Joe-
## physics

when a 2.50 kg object is hung vertically on a certain light spring described by hookes law the spring stretches 2.76 cm. A) what is the force constant of the spring. B) if the 2.50 kg object is removed how far will the spring strecth if a 1.25 kg block is

*asked on November 6, 2011* -
## Algebra

THe function h(t)=-16t^2+v0t+h0 describes the height in feet above the ground h(t) of an object thrown vertically from a height of h0 feet, with an initial velocity of v0 feet per second, if there is no air friction and t is the time in seconds sine the

*asked on April 19, 2010* -
## pre calculus

cube roots of 64i?

*asked on May 20, 2011* -
## chem

How many moles of C6H12O6 are formed when 0.250 mole of CO2 is consumed in the reaction 6 CO2 + 6 H2O C6H12O6 + 6 O2?

*asked on June 20, 2012* -
## Physics

Block 1, of mass m1 = 0.650kg , is connected over an ideal (massless and frictionless) pulley to block 2, of mass m2, as shown. For an angle of θ = 30.0∘ and a coefficient of kinetic friction between block 2 and the plane of μ = 0.400, an acceleration

*asked on October 3, 2013* -
## Exponential Modeling

A species of frog’s population grows 24% every year. Suppose 100 frogs are released into a pond. How many frogs will there be in 5 years?

*asked on April 30, 2016* -
## trigonometry

the bases of a trapezoid are 22 and 12 respectively. The angles at the extremities of one base are 65 degree and 40 degree respectively find the two legs. Answer using law of sines pls

*asked on February 10, 2012* -
## Math

5 basketball teams play each other once. How many games are played?

*asked on October 15, 2015* -
## Chemistry

What volume of “wet” methane would have to be collected at 20.0 oC and 760.0 torr to be sure the sample contained 2.00 x 102 ml of dry methane at the same temperature and pressure ? My Work: All I have so far is that I use P1V1=P2V2 but I don't know

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

An artificial satellite circles the Earth in a circular orbit at a location where the acceleration due to gravity is 8.26 m/s2. Determine the orbital period of the satellite.

*asked on April 29, 2014* -
## physics

A 1.5-kg cart is pulled with a force of 7.3 N at an angle of 40° above the horizontal. If a kinetic friction force of 3.2 N acts against the motion, the cart’s acceleration along the horizontal surface will be

*asked on November 12, 2011* -
## Chemistry

the half-life of cobalt-60 is 5.20 years.. how many milligrams of a 2.000-mg sample remains after 6.55 years

*asked on October 8, 2012* -
## Chem 2

what is the solubility of silver carbonate in water in 25 degrees celcius if Ksp=8.4X10-12? i don't know what to do Write the equation. Ag2CO3(s) ==> 2Ag^+ + CO3^= Ksp = (Ag^+2)(CO3^=) Let x = solubility of Ag2CO3. At equilibrium,(Ag^+) = 2x; (CO3^=) = x.

*asked on April 28, 2007* -
## English

This question isn't a homework question, but this relates to English grammar. Would I capitalize the name of this food item? I've seen people use both lowercase and capitalization. This *Chicken Croissant Casserole* was so good!

*asked on July 27, 2020* -
## Statistics

WEB CALCULATOR EXERCISE Descriptive Statistics 1 The table below presents data for a sample of people who completed a religious survey. Age Gender Denomination Church Attendance 56 1 7 4 46 2 6 5 49 2 6 5 49 1 1 5 27 2 9 5 51 1 4 2 47 2 2 3 67 1 5 4 49 2 2

*asked on January 28, 2014* -
## math

Macy's Department Stores markup men's cologne 63% on cost for an 8-ounce bottle. A bottle of cologne costs Macy's $23.00. What is the selling price for the 8-ounce bottle? $31.51

*asked on June 30, 2017* -
## Physics

With a 1220–W toaster, how much electrical energy is needed to make a slice of toast (cooking time = 1.3 minute)? At 12.1 cents/kW·h, how much does this cost? (You do not need to enter any units.)

*asked on September 13, 2014* -
## Physics

One end of a uniform 3.20-m-long rod of weight Fg is supported by a cable at an angle of θ = 37° with the rod. The other end rests against the wall, where it is held by friction as shown in the figure below. The coefficient of static friction between the

*asked on April 5, 2014* -
## algebra

The sum of a number and three times another number is 18. Find the number if their product is a maximum.

*asked on March 18, 2015* -
## math

From a standard 52 card deck, how many 5 card hands will have 2 clubs and 3 hearts?

*asked on July 31, 2013* -
## Chemistry

Calculate the pH at the equivalence point for the titration of 0.130M methalamine (CH3NH2) with 0.13M Hcl. The Kb of methyl amine is 5.0x10-4.

*asked on March 18, 2013* -
## Math 124

There are several ways you might think you could enter numbers in WebAssign, that would not be interpreted as numbers. N.B. There may be hints in RED!!! You cannot have commas in numbers. You cannot have a space in a number. You cannot substitute the

*asked on September 28, 2011* -
## 7th grade

What did the spanish farmer say to his chicken

*asked on October 21, 2009* -
## Physics

An object of mass 1.00 kg is attached to a vertical spring with spring constant 100 N/m. The object is held at rest in a position such that the spring is stretched upward a distance 1.00 cm beyond its undisturbed length. If the object is released, how far

*asked on November 5, 2014* -
## Chemistry

For the reaction 2NH3(g) 3H2(g) N2(g) at 472oC equilibrium is established when [H2] =0.0200M, [N2] = 0.0100M and [NH3] = 5.37x10^_8 M. What is the equilibrium constant for the reverse reaction?

*asked on July 16, 2012* -
## Precalc

Find a possible formula for the trigonometric function whose values are in the following table (note the values in the table may be slightly rounded): x 0.00 0.17 0.33 0.50 0.67 0.83 1.00 1.17 1.33 1.50 1.67 1.83 2.00 g(x) 4.00 5.50 6.60 7.00 6.60 5.50

*asked on November 9, 2017* -
## Physics

A ball (mass m = 250 g) on the end of an ideal string is moving in a circular motion as a conical pendulum. The length L of the string is 1.84 m and the angle with the vertical is 37 degrees. a) What is the magnitude of the torque (N m) exerted on the ball

*asked on July 11, 2012* -
## algebra

Sophie is buying fabric to make items for a craft fair. The table shows some combinations of how much of each color fabric she might buy. Which equations model the total yards of fabric Sophie will buy? Check all that apply.

*asked on June 17, 2020* -
## Electric Power Tools

I need help with my test, I don't know if they are all right or not. I answered the questions to the best of my ability. My answers are marked with an *. 1. What is the typical no-load speed of a high-speed drill? A. 1,000 rpm *B. 2,500 rpm C. 3,000 rpm D.

*asked on December 15, 2011* -
## operating system

If /home/jenny/draft and /home/alex/letter are links to the same file and the following sequence of events occurs, what will be the date in the opening of the letter? a. Alex gives the command vim letter. b. Jenny gives the command vim draft. c. Jenny

*asked on October 14, 2009* -
## accounting

What would you pay for a $50,000 debenture bond that matures in 15 years and pays $5,000 a year in interest if you wanted to earn a yield of: (Round computations to 2 decimal places and use the rounded amounts to calculate the final answer. Round the final

*asked on February 23, 2009* -
## physics

A copper telephone wire has essentially no sag between poles 30 m apart on a winter day when the temperature is −16◦C. How much longer is the wire on a summer day when the temperature is 26 ◦C? Assume that the thermal coefficient of copper is

*asked on January 22, 2015* -
## Chemistry

The oxidation of iodide ion by arsenic acid, H3AsO4, is described by the balanced equation 3I−(aq)+H3AsO4(aq)+2H+(aq)→ I3−(aq)+H3AsO3(aq)+H2O(l) If −Δ[I−]/Δt = 4.8×10−4M/s , what is the value of Δ[I3−]/Δt during the same time interval?

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

A car of mass m moving at a speed v1 collides and couples with the back of a truck of mass 3m moving initially in the same direction as the car at a lower speed v2. (Use any variable or symbol stated above as necessary.) (b) What is the change in kinetic

*asked on March 12, 2014* -
## physics

An oxygen molecule consists of two oxygen atoms whose total mass is 5.3 x 10-26 kg and whose moment of inertia about an axis perpendicular to the line joining the two atoms, midway between them, is 1.82 × 10-46 kg·m2. From these data, estimate the

*asked on January 2, 2012* -
## Anatatomy and Physiology

The ability of a specific tissue or organ to respond to the presence of a hormone is dependent on:

*asked on April 8, 2010* -
## Trig 2

What is the smallest value for x where y = sin 2x reaches its maximum ...wtf that means.

*asked on May 13, 2014* -
## math

Chances are 50-50 that a newborn baby will be a girl. For families with five children, what is the probability that all the children are girls

*asked on November 24, 2012* -
## Physics

On a frictionless, horizontal air track, a glider oscillates at the end of an ideal spring of force constant 2.30 N/cm. The graph in the figure shows the acceleration of the glider as a function of time. Find the mass of the glider. Find the maximum

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

1.) How much ethanol, C2H5OH, in liters (d=0.789g/ml) must be dissolved in water to produce 190.5 of 1.65 M C2H5OH? (Molarity problem.) 2.) How much concentrated hydrochloric acid solution (36.0% HCl by mass, d = 1.18g/mL}), in milliliters, is required to

*asked on February 12, 2010* -
## Math

Calculate the probability that 200 rolls of two dice rolls will include a) more than 30 sums of 5 b) between 30 and 40, inclusive, sums of 5

*asked on June 12, 2017* -
## math

The Davidson family wants to expand its rectangular patio, which currently measures 15 ft by 12 ft. They want to extend the length and width the same amount to increase the total area of the patio by 160 ft2. Which quadratic equation best models the

*asked on April 29, 2016* -
## Physics

A satellite used in a cellular telephone network has a mass of 2160 kg and is in a circular orbit at a height of 670 km above the surface of the earth. What is the gravitational force Fgrav on the satellite? Take the gravitational constant to be =

*asked on April 12, 2012* -
## physics

A science museum has asked you to design a simple pendulum that will make 25.0 complete swings in 85.0 {\rm s}. How long should the pendulum be? in meters

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

A 67.7 kg person jumps from rest off a 3.11 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.04 m under the surface of the water. Determine the magnitude of the average force that the water exerts on

*asked on February 20, 2012* -
## Physics

A 100-Watt light bulb plugged into a 120-Volt outlet is left on for 60 seconds. How much energy (in Joules) is used up by the bulb during this time?

*asked on January 30, 2011* -
## Chemistry

The rotten smell of a decaying animal carcass is partially due to a nitrogen-containing compound called putrescine. Elemental analysis of putrescine indicates that it consists of: C, 54.50%, H, 13.73%, and N, 31.77%. Calculate the empirical formula of

*asked on October 4, 2019* -
## Math

Suppose that the weather forecast calls for a 30% chance of rain on each of the three days of a long weekend. What are the odds in favour of no rain throughout the entire long weekend? Claudia and Ally are the two favourites to win an upcoming golf

*asked on June 19, 2017* -
## Math

In a study of 800 men,diastolic blood pressure was found to be approximately normally distributed, with a mean of 84 millimeters (mm) of mercury and standard deviation of 10 millimeters. Use the 68-95-99.7% rule to determine what percentage of the test

*asked on December 15, 2016* -
## help please

A student wants to know why if the odds in favor of an event are 3:4, the probability of the event occurring is not 3/4 How do you respond?

*asked on February 20, 2015* -
## Physics

A lathe, initially at rest, accelerates at .60 rad/s^2 for 10s, then runs at a constant angular velocity for 20s, and finally decelerates uniformly for 10s to come to a complete stop. What is its average angular velocity?

*asked on November 23, 2014* -
## PreCalc

Consider the tip of each hand of a clock. Find the linear velocity in millimeters per second for each hand. a. second hand which is 30 millimeters. b. minute hand which is 27 millimeters long. c. hour hand which is 18 millimeters long. Please tell me how

*asked on November 18, 2007* -
## Exponential Modeling

Suppose a tortoise is 2000 feet from the ocean. Each day the tortoise travels one-half of the remaining distance to the ocean. Use this information to: Compute the remaining distance to the ocean after 4 days of travel.

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

Show that the curve with parametric equations x=tcost, y=tsint, z=t lies on the cone z^2=x^2+y^2

*asked on July 5, 2015* -
## physics

A physics book slides off a horizontal tabletop with a speed of 1.10m/s{\rm m}/{\rm s} . It strikes the floor in 0.350s{\rm s} . Ignore air resistance.

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

A 4 kg block rests between the floor and a 3 kg block. The 3 kg block is tied to a wall by a horizontal rope. If the coefficient of static friction is 0.800 between each pair of surfaces in contact, what force must be applied horizontally to the 4 kg block

*asked on December 19, 2012* -
## Calculus

Use linear approximation, i.e. the tangent line, to approximate (1/0.504) as follows: Find the equation of the tangent line to f(x)=1/x at a "nice" point near 0.504. Then use this to approximate (1/0.504).

*asked on April 3, 2012* -
## Chem

A mass spectrum of phosporus atoms shows only a single peak at a mass of 31 what can you conclude from this observation?

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

If you triple 4 and subtract 2 each day, how many days until you have zero?

*asked on April 6, 2011* -
## phisical science

On a winter day the temperature drops from –15°C to –25°C overnight. If a pan sitting outside contains 0.20 kg of ice, how much heat is removed from the ice for this temperature change?

*asked on September 29, 2017* -
## Chem

500.0 Ml of 0.160 M NaOH is added to 565 ml of 0.250 M weak acid. Ka=2.46x10^-5. What is the pH of the resulting buffer

*asked on March 10, 2014* -
## Differential Equations

A tank originally contains 5 lb of salt dissolved in 200 gal of water: Starting at time t=0, a salt solution containing 0.10 lb/gal is to be pumped into the tank at a constant rate and the well-stirred mixture is to flow out of the tank at the same rate.

*asked on September 17, 2012* -
## geometry

in the diagram below of triangle abc, de is a midsegment of triangle abc, de=7, ab=10, and bc=13.find the perimeter

*asked on October 13, 2011* -
## Physics

Which of the following statements is true for an elastic collision? A. Both momentum and kinetic energy are conserved. B. Momentum is conserved, but kinetic energy is not conserved. C. Kinetic energy is conserved, but momentum is not conserved. D. The

*asked on March 5, 2011* -
## physics

An electronic tracking device is placed on a police dog to monitor its whereabouts relative to the police station. At time t1 = 23 minutes, the dogs placement from the station is 1.2km, 33 degrees north of east. At time t2=57 minutes, the dog's

*asked on July 8, 2008* -
## Programming

The raptor program displays the grade for each test score and the average of all four test scores. Use a loop to input four test scores. Validate the input. The test scores must be between 0 and 100.

*asked on November 17, 2019* -
## Spanish 1 b

please check my answers 2. How do you say one must in Spanish A. Hay que * B. A menudo C. Que más D. Es necesario 5. A person of mixed European and indigenous heritage is commonly to as a____ A. Mixtec B. Mestizo* C. Maya D. Nahuatl 6. Which is not a

*asked on April 18, 2017* -
## physics

A student witnesses a flash of lightning and then t = 6.5 s later the student hears the associated clap of thunder. Light travels at 3.0 × 108 m/s in the air. How long, t1, in seconds did it take the light to reach the student's eyes after the flash?

*asked on September 11, 2014* -
## Science

A 1.0-kilogram book rests on a horizontal tabletop. The magnitude of the force of the tabletop on the book is

*asked on October 7, 2013* -
## math

a man who is 5 feet tall stands 15 feet from a lamppost that is 27 feet high. how far away from the man is the tip of his shadow?

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

A wheel of diameter 28.0 cm is constrained to rotate in the xy plane, about the z axis, which passes through its center. A force = (-38.0 + 39.0 ) N acts at a point on the edge of the wheel that lies exactly on the x axis at a particular instant. What is

*asked on January 2, 2012* -
## physics

A child lifts a 5.0-newton toy to a height of 0.50 meters. How much work is done on the toy?

*asked on November 8, 2011* -
## AP Chemistry

Which action(s) will decrease the equilibrium concentration of a non-reacting gas in water? 1. decreasing the temp. of the water 2. decreasing the volume of water 3. decreasing the pressure of the gas above the liquid a. 1 only b. 2 only c. 3 only d. 1 and

*asked on April 4, 2008* -
## chemistry

A 25.0 mL sample of 0.100 M pyridine (Kb for pyridine is 1.7 ✕ 10-9) is titrated with 0.100 M HCl solution. Calculate the pH after the addition of the following amounts of HCl with sig figs. a) 24.5 mL b) 25.0 mL c) 26.0 mL d) 28.0 mL e) 30.0 mL

*asked on April 9, 2020* -
## algebra

Find the equation of a horizontal line that goes through the point (5, -3). Explain your answer

*asked on May 12, 2015* -
## Math

Jennifer rode her bike to the store at a rate of 15 mph. She rode back home at a rate of 10 mph. How far is it to the store if the round trip takes an hour?

*asked on April 19, 2015* -
## math

from a standard 52 card deck, how many 7 card hands have exactly 5 spades and 2 hearts?

*asked on July 31, 2013* -
## math

it is a 6 digit number. there is no repetition of digits. It is divisible by 5 and is more than 3000,000. The digit in the hundreds place is 3 more than the digit in the ones place. The digit in the ten thousands place is 3 times the digit in the hundred

*asked on September 25, 2012* -
## Mathematics

The mass of Aravin to the mass of Bob is in the ratio 17 : 13. If the difference in their masses is 12 kg, find their combined mass.

*asked on February 8, 2012* -
## Calculus

find the limit. use L'Hopital's Rule if necessary. lim (x^2+3x+2)/(x^2+1) x -> -1

*asked on November 13, 2007* -
## Exponential Modeling

Atmospheric pressure decreases by about 12% for every kilometer you climb. The pressure at sea level is about 1013 atmospheres. How many atmospheres of pressure will you feel at 8.848 km?

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

Let $f(x) = \dfrac{2-3x}{5-2x}$. For what value of $a$ is $f(a) = 3$? Thanks!

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

What is the ninth term of the arithmetic sequence defined by the rule A(n)=-14+(n-1)(2) A)232 B)230 C)2 D)4 Thanks

*asked on December 22, 2015* -
## PHYSICS

Determine the resulting temperature when 1kg of ice at 0 Degree celcius is mixed with 9kg of water.

*asked on April 12, 2015* -
## physics

A light–rail commuter train draws 645 A of 590–V DC electricity when accelerating. What is its power consumption rate in kilowatts? How long does it take to reach 30.0 m/s starting from rest if its loaded mass is 4.50×104 kg, assuming 91.0% efficiency

*asked on September 13, 2014* -
## physics

a longitudinal wave with a frequency of 3.0 Hz takes 1.7 s to travel the length of a 2.5-m slinky (see figure 16.3). Determine the wavelength of the wave.

*asked on November 19, 2012* -
## Math

Jim is paid overtime when he works more than 40 hours of per week. Write an expression for the number of hours he works overtime when he works h hours. Find the number of hours Jim works overtime when he works 40, 44, 48, and 52 hours

*asked on September 6, 2012* -
## english

What type of clause or phrase is italicized in the sentence below? The driver, confused by the sign, made a wrong turn.

*asked on May 10, 2012* -
## Physics

A mass is oscillating with amplitude A at the end of a spring. How far (in terms of A) is this mass from the equilibrium position of the spring when the elastic potential energy equals the kinetic energy?

*asked on April 18, 2012* -
## Mathematics

OPQRS is a right pyramid whose base is a square of sides 12cm each. Given that the slant height of the pyramid is 15cm. Find the height of the pyramid, the volume of the pyramid, and the total surface area of the pyramid by first drawing the net of the

*asked on February 11, 2012* -
## REBUS PUZZLES

I need help with some rebus puzzles please. T H R O U G H The letters TRUH are in Bold color. E OV RRAT D E

*asked on March 27, 2011* -
## Chemistry

The solubility of calcium sulfate at 30 degrees C is .209 g/100mL solution. Calculate its Ksp i calculated it and got 1.5 x 10 ^-2 but the program said that it was wrong if you could help explain how to do it i would appreciate it

*asked on November 30, 2010* -
## statistics

In a survey, 63% of Americans said they own an answering machine. If 14 Americans are selected at random, find the probability that exactly 9 own an answering machine.

*asked on October 5, 2010* -
## math

If a question states: Use the digits 1-9 only in order. Insert operation sings and grouping symbols to ge the value of 100.: what do I do or what is the answer?? It says to use 1 2 3 4 5 6 7 8 9 and insert + - * / ( ) to get an expression that evaluates to

*asked on September 12, 2006* -
## science

What is the molarity of CH3COOH in vinegar containing 4.0% CH3COOH by mass and having a density of 1.02 g/ml?

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

Matt is attempting to sail a sailboat northeast across the river with a velocity of 13 m/s relative to the current of water. The water current is flowing from south to north at a velocity of 6 m/s. If the angle between the velocity of the sailboat and the

*asked on September 19, 2017* -
## physics

A copper wire that has a diameter of 2.9 mm carries a current of 39.0 A. Assuming that each copper atom contributes one free electron to the metal, find the drift velocity of the electrons in the wire. The molar mass of copper is 63.5 g/mol and the density

*asked on July 6, 2016* -
## Chemistry

In a 1.0× 10–2 M solution of CH3NH3Br(aq), identify the relative molar amounts of these species. H2O, OH-, CH3NH3+, CH3NH2, H3O+, Br-, HBr

*asked on March 28, 2016* -
## Maths

Round 4.389 to 2 decimal places.

*asked on January 14, 2016* -
## Physics

A mass of 100g is attached to one end of a massless rod, 10cm in length, which is pivoted about the opposite end. The rod is held vertical, with the mass at the top, and released. The rod swings. A. What is the speed of the mass at the instant that the rod

*asked on November 10, 2014*