# Eric

Popular questions and responses by Eric-
## chemistry

Assuming equal concentrations, rank these aqueous solutions by their freezing point.? K2CO3, Li3PO4, Sn(ClO3)4, NH4I I tried to rank them according to the number of ions but i can't get it. highest freezing point --> lowest freezing point Sn(ClO3)4 ->

*asked on February 19, 2012* -
## Physics

The components of vector A⃗ are Ax = + 3.90 and Ay = -4.00. What is the angle measured counterclockwise from the +x-axis to vector A⃗ ?

*asked on September 11, 2015* -
## Chem HELP!!

Which one of the following sets of quantum numbers can correctly represent a 3p orbital? a) (n = 3 l = 1, ml = 2) b)(n = 1, l = 3, ml = 3) c) (n = 3, l = 2, ml = 1) d) (n = 3, l = 1, ml = -1) e) (n = 3, l = 0, ml = 1)

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

Scores on the GRE (Graduate Record Examination) are normally distributed with a mean of 541 and a standard deviation of 101. Use the 68-95-99.7 Rule to find the percentage of people taking the test who score between 238 and 844 The percentage of

*asked on December 8, 2016* -
## chemistry

A 141-mg sample was placed on a watch glass that weighed 9.203 g. What is the weight of the watch glass and sample in grams?

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

Are these correct? I. Rewrite each sentence by replacing the direct object in quotation marks with a direct object pronoun [me, te, lo, la, nos, los, las]. Ejemplo: No conozco "al jefe del departamento." --> No lo conozco. 1. Esa compañía vende "casas

*asked on January 23, 2014* -
## physics

Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 12 rubs a distance of 7.50 cm each and with a frictional force averaging 30.0 N, what is the temperature increase? The

*asked on July 19, 2013* -
## Physics

A rocket-powered hockey puck moves on a horizontal frictionless table. The figure below shows the graphs of vx and vy, the x- and y-components of the puck’s velocity. The puck starts at the origin. The graph of the X-velocity is v=8t cm/s and the

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

The "steam" above a freshly made cup of instant coffee is really water vapor droplets condensing after evaporating from the hot coffee. What is the final temperature of 280 g of hot coffee initially at 90.0°C if 2.50 g evaporates from it? The coffee is in

*asked on July 21, 2013* -
## physics

The same amount of heat entering identical masses of different substances produces different temperature changes. Calculate the final temperature when 1.25 kcal of heat enters 1.25 kg of the following, originally at 20.0°C. (a) water (b) concrete (c)

*asked on July 19, 2013* -
## math

Mrs. Bollo's second grade class of thirty students conducted a pet ownership survey. Results of the survey indicate that 8 students own a cat, 15 students own a dog, and 5 students own both a cat and a dog. How many of the students surveyed own no cats?

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

A firefighter a distance d from a burning building directs a stream of water from a fire hose at angle θi above the horizontal as in the figure. If the initial speed of the stream is vi, at what height h does the water strike the building? (Use theta for

*asked on February 18, 2011* -
## Physics

A ball of mass m makes a head-on elastic collision with a second ball (at rest) and rebounds with a speed equal to one-fourth its original speed. What is the mass of the second ball?

*asked on December 10, 2009* -
## chemistry

Complete combustion of a 0.40-mol sample of a hydrocarbon, CxHy, gives 2.40 mol of CO2 and 1.60 mol of H2O. The molecular formula of the original hydrocarbon is Group of answer choices C2H8. C6H8. C9H16. C5H5. C4H7.

*asked on January 21, 2020* -
## Physics

A massive steel cable drags a 20kg block across a horizontal, frictionless surface. A 100N force applied to the cable causes the block to reach a speed of 4.2m/s in a distance of 2.1m . What is the mass of the cable?

*asked on May 30, 2015* -
## Math

Simplify (Log75+log9+log5)÷(log5+log45)

*asked on November 10, 2016* -
## Physics

A diagnostic sonogram produces a picture of internal organs by passing ultrasound through the tissue. In one application, it is used to find the size, location, and shape of the prostate in preparation for surgery or other treatment. The speed of sound in

*asked on November 2, 2019* -
## math, economics, game theory

Two people have 10 dollars to divide between themselves. they use the following procedure. each person names a number of dollars (nonnegative integer), at most equal to 10. IF the sum of the amounts that the people name exceeds 10 and the amounts named are

*asked on September 10, 2007* -
## Chemistry

When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 26.4 g of carbon were burned in the presence of 82.1 g of oxygen, 11.7 g of oxygen remained unreacted. What mass of carbon dioxide was produced? Express your answer to one

*asked on September 14, 2016* -
## physics

A certain heat engine does 8.0 kJ of work and dissipates 8.00 kJ of waste heat in a cyclical process. (a) What was the heat input to this engine? (b) What was its efficiency?

*asked on July 24, 2013* -
## ChemII

A saline solution is 0.9% NaCl. What masses of NaCl and water would be required to prepare 50. L of this saline solution? Assume that the density of water is 1.000g/mL and that the NaCl does not add to the volume of the solution.

*asked on January 9, 2011* -
## Spanish

Is this correct? Complete the paragraph with the correct present-tense form of the most logical verb from the list below. Each verb will be used no more than once, and don’t forget the reflexive pronouns when appropriate. acostarse bañarse deletrear

*asked on February 10, 2014* -
## math

a brick is placed on a balance scale.it balances exactly with a 3/4 pound weight and 3/4 of a brick .what is the weight of the brick? show and explain work

*asked on November 11, 2013* -
## Math

Ann, Mara, Jenny, Tina, and Sue are sisters. Two of the five sisters must help their father at this business each Saturday. How many combinations of two sisters are possible?

*asked on September 13, 2011* -
## chemistry help~Please!!!

What are the Ka and/or Kb value for 1M ZnCl2 Show work please!!!

*asked on April 11, 2014* -
## Spanish

Are these correct? Thank you for helping Finish the following sentences including at least one possessive adjective (mi[s], tu[s], su[s], nuestro[s] or nuestra[s]) in your answer. Ejemplo: La profesora que tiene mi amiga es antipática, pero "mis

*asked on January 24, 2014* -
## physics

A hand-driven tire pump has a 2.50 cm diameter piston and a maximum stroke of 31.0 cm. (a) How much work (J) do you do in one stroke if the average gauge pressure is 2.40 multiplied by 105 N/m2 (about 35 psi)? (You may consider this an isothermal process.)

*asked on July 24, 2013* -
## english

which is correct? a couple billions of dollar or a couple billion of dollars

*asked on February 10, 2008* -
## Math

You survey 1000 new home buyers and find that the mean price was $185,000 and the standard deviation was $20,000. How many paid more than $210,000?

*asked on December 5, 2017* -
## Math

The 3rd and 7th terms of an A.P are -1 and 11 respectively. Fine the nth term and the numbers of which must be added to get a sum of 430

*asked on September 20, 2017* -
## Math

How many inches represent 1 mile. Help 3/10 in = 7/8 mile

*asked on December 8, 2016* -
## Algebra

Given that xy = 3/2 and both x and y are nonnegative real numbers, find the minimum value of 10x + 3y/5

*asked on August 22, 2014* -
## 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 July 15, 2013* -
## Economics

1. An economy's production possibilities frontier is also its consumption possibilities frontier. a. under all circumstances b. under no circumstances c. when the economy is self-sufficient d. when the rate of tradeoff between the two goods being produced

*asked on September 9, 2012* -
## Chemistry

In a constant-pressure calorimeter, 50.0 mL of 0.300 M Ba(OH)2 was added to 50.0 mL of 0.600 M HCl. The reaction caused the temperature of the solution to rise from 24.50 degrees C to 28.59 degrees C. If the solution has the same density and specific heat

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

Determine the sum of the following angles: 13° 31' 27" , 64° 12' 48"

*asked on March 24, 2011* -
## physics

A fireworks rocket explodes at height h, the peak of its vertical trajectory. It throws out burning fragments in all directions, but all at the same speed v. Pellets of solidified metal fall to the ground without air resistance. Find the smallest angle

*asked on February 18, 2011* -
## math

Evaluate the expression 8a + b for the given variable. b = 3a – 2

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

One side of the roof of a building slopes up at 35.5°. A student throws a Frisbee onto the roof. It strikes with a speed of 15.0 m/s and does not bounce, but slides straight up the incline. The coefficient of kinetic friction between the plastic and the

*asked on February 24, 2011* -
## college

Two point charges have a total charge of 505 µC. When placed 1.10 m apart, the force each exerts on the other is 19.3 N and is repulsive. What is the charge on each? (Round your answers to the nearest µC.)

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

You have a 22L cylinder of helium at a pressure of 150atm and a temperature of 31C. How many ballons can you fill, each with a volume of 5.0L, on a day when the atmospheric pressure is 755mmHg and the temperature is 22C? I know I use PV=nRT, but what

*asked on September 27, 2009* -
## Math

An enclosed rectangular garden is 6 meters by 15 meters. Additional fencing within the garden can divide it into three smaller plots, two of them square and one rectangular. What is the least number of meters of additional fencing that is needed?

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

Three forces are exerted on an object placed on a tilted floor. Forces are vectors. The three forces are directed as shown in the figure. If the forces have magnitudes F1 = 2.0 N, F2 = 17.0 N and F3 = 15.0 N, where N is the standard unit of force, what is

*asked on September 11, 2015* -
## Spanish

Are these correct? Answer the following questions using the present progressive. Be sure to answer with the same verb that is used in each question. 1. Creo que Xavier (1) _____ (2) __________ en la casa de sus padres mientras asiste a la Universidad.

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

In 1986 a gargantuan iceberg broke away from the Ross Ice Shelf in Antarctica. It was approximately a rectangle 160 km long, 45.0 km wide, and 250 m thick. (a) What is the mass of this iceberg, given that the density of ice is 917 kg/m3? (b) How much heat

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

Which of the images above represents a proof of the Pythagorean Theorem? Explain your choice, and then explain how the figure proves the Pythagorean Theorem.

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

A company made $4 million in the second quarter. This is 1/3 more than it made in the first quarter and 4/5 of what it made in the third quarter. How much did the company make in the three quarters combined?

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

In a local bar, a customer slides an empty beer mug down the counter for a refill. The bartender is momentarily distracted and does not see the mug, which slides off the counter and strikes the floor at distance d from the base of the counter. The height

*asked on February 18, 2011* -
## Organic Chem

A 20 g mixture containing 95% (by weight) of A and 5% of B is recrystallized in toluene (b.p. 110 C). Solubility for compound A is 1.5 g @20 degrees and 10 g @ 110 degrees. For compound B solubility is 0.5 g @20 degrees and 8 g @ 110 degrees. What amount

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

M angle lmn =6x-20 howdo i find out what x is

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

how do you conjugate aimer mieux? do you just conjugate the aimer part?

*asked on February 9, 2008* -
## Algebra

I have answered the question but not sure how to check for extraneous solution. x/(5x+4)=3 The answer is -6/7

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

A circus cat has been trained to leap off a 12-m-high platform and land on a pillow. The cat leaps off at v0 = 3.6 m/s and an angle θ = 37°

*asked on February 6, 2017* -
## physics 11

A swimmer swims perpendicular to the bank of a 20.0 m wide river at a velocity of 1.3 m/s. Suppose the river has a current of 2.7 m/s [W]. (a) How long does it take the swimmer to reach the other shore? (b) How far downstream does the swimmer land from his

*asked on October 20, 2015* -
## math

Isaiah and Andy had a total of 560 trading cards. After Isaiah gave1/9 of cards to Andy they had an equal # of trading cards. How many more cards did isiah have than Andy at the beginning?

*asked on February 22, 2015* -
## physics

a 65kg person dives into the water from the 10m platform. she comes to a stop 2m below the surface of the water. what net force did the water exert on the swimmer? so for the net force i got -2548N i know: vf^2=vi^2 + 2ad vf^2 = 0 + 2(9.8)(10) vf^2 = 196

*asked on February 6, 2014* -
## physics

A hot air balloon is ascending straight up at a constant speed of 6.50 m/s. When the balloon is 13.0 m above the ground, a gun fires a pellet straight up from ground level with an initial speed of 34.0 m/s. Along the paths of the balloon and the pellet,

*asked on September 10, 2013* -
## physics

The engine of a large ship does 2.05 multiplied by 108 J of work with an efficiency of 4.00%. (a) How much waste heat (J) is produced? (b) How many barrels of fuel are consumed, if each barrel produces 6.00 multiplied by 109 J of heat when burned?

*asked on July 24, 2013* -
## physics

The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 8.80 g of condensation forms on a glass containing water and 170 g of ice, how many grams will melt as a result? Assume no other heat transfer

*asked on July 20, 2013* -
## Economics

The well known nationally syndicated columnist David Broder reported the recent findings of two academic political scientists. These scholars found that voters are quite turned off by negative campaigns of politicians. Many people went as far as not voting

*asked on July 15, 2013* -
## English IV

Score: "I always lie" is an example of which of these literary devices? A)paradigm B)paradox C)metaphor D)personification E)none of these

*asked on May 23, 2013* -
## calculus-extrema

Find and classify the relative maxima and minima of this function f(x)= definite integral sign where a=0 and b=x. t^2-4/(1+(cos^2(t)) dt what should my value for u be? is it just t. not sure how to even tackle this problem.

*asked on May 15, 2013* -
## english

chick: a young woman A. direct definition B. indirect definition a

*asked on February 18, 2012* -
## Chemistry

The specific heat of a certain type of metal is 0.128 J/(g-c). What is the final temperature if 305 J of heat is added to 86.9 g of this metal initially at 20 degrees C? Tfinal = ___ C

*asked on February 8, 2012* -
## social studies

explain whether you think it is better for the country to have a policy of isolationism or one of imperialism. help meee its a study question for tommorrows test i need to know the answer!

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

You and your friend are practicing pass plays with a football. You throw the football at a 35.0° angle above the horizontal at 19.0 m/s. Your friend starts right next to you, and he moves down the field directly away from you at 5.50 m/s. How long after

*asked on September 30, 2011* -
## english

Identify the noun clause in the following sentence: What they should do is hire a tutor who can help them with their math skills.

*asked on July 25, 2011* -
## physics

What must be the radius of a 4 kg circular disk if it is to have the same moment of inertia as a 1 kg rod 1 M long and pivoted at its midpoint?

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

A projectile is fired in such a way that its horizontal range is equal to 8.5 times its maximum height. What is the angle of projection?

*asked on February 18, 2011* -
## physics

A dive bomber has a velocity of 235 m/s at an angle θ below the horizontal. When the altitude of the aircraft is 2.15 km, it releases a bomb, which subsequently hits a target on the ground. The magnitude of the displacement from the point of release of

*asked on February 18, 2011* -
## Yoku

A prism has total surface area of 360 m2 and volume of 60 m3. If the length, width, and height are reduced to half their original sizes, what will be the following?

*asked on March 15, 2010* -
## social

The direct approach for delivering bad news is best for persons who A) you do not know well. B) prefer straightforward messages. C) are unfamiliar with your company. D) All of these. im not sure if the direct approach is based on people knowing each other

*asked on October 6, 2009* -
## Chemistry

You have a 22L cylinder of helium at a pressure of 150atm and a temperature of 31C. How many ballons can you fill, each with a volume of 5.0L, on a day when the atmospheric pressure is 755mmHg and the temperature is 22C?

*asked on September 27, 2009* -
## math

howmanycupsin1gallon

*asked on March 4, 2008* -
## french

What does it mean...Je te deteste. Why is the te there? Another one is je t'adore?

*asked on January 26, 2008* -
## AP Chemistry

I need alot of help on this problem, it is due WEDNESDAY and I have no clue how to do it Use the following information to identify element A and come pound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass of

*asked on January 21, 2008* -
## english

i need vocab words for call of the wild

*asked on August 30, 2007* -
## Math

How many subsets of a set with 100 elements have more than one element? The answer to your question is the number of all of the subsets minus the number of subsets with just one element. had do you find the perimeter and the area whats the measurment of b

*asked on March 8, 2007* -
## Further mathematics

Find the first bank term of a linear sequence is 3 and the 8th term is 3.1.find the common difference

*asked on January 17, 2019* -
## Physics

Determine the indicator horse power and piston displacement of a machine of the piston area 100m^2 given the piston stroke to be 600cm and indicating mean pressure to be 500kg/m^2. The number of piston stroke per minute is 4

*asked on November 4, 2018* -
## Physics

A man using 80kg garden tractor on a level surface exert a force of 50N at 65^0 to the ground. Find the vertical force of the garden tractor on the ground

*asked on November 4, 2018* -
## Algebra

21. simplify (2sqrt5+3sqrt7)^2 show your work. Been confused on it for a while.

*asked on May 8, 2017* -
## Statistic

At peak periods 15 of attempted logins to an email service fail. log-in attempts are independent and each has the name probability of failing. Ann logs in repeatedly until she succeeds A. Find the probability that Ann needs to log in atleast four times

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

Sam is hoisting an engine form a pickup truck he is fixing. He hands hoist using 3 rafters on ceiling. Measures the angle the hoist makes at the baseto be 85 degrees and the length across the of chain across rafters to be 80 inches. One length of chain

*asked on January 17, 2017* -
## Calculus

Evaluate the definite integral (low) (high) -π/6 ∫ π/6 2sec(x)tan(x) dx

*asked on November 16, 2016* -
## Calculus

Find the value(s) of c guaranteed by the Mean Value Theorem for Integrals for the function over the given interval. f(x) = 4√x [4, 9]

*asked on November 15, 2016* -
## Calc

Find the critical numbers of the functions. f(0) = 2sec0 +tan0 on the interval [0,2pi]

*asked on November 15, 2016* -
## math

The ratio of two numbers is 3:5, the smallest number is 45 what is the larger number?

*asked on October 18, 2016* -
## math

in which stem do most of the data fall 1 ,2 3, or 4

*asked on October 6, 2016* -
## art

this piece of art primarily represents art that

*asked on October 6, 2016* -
## Educational Technology and Online Learning

what is the purpose of the introduction in an expository essay

*asked on September 14, 2016* -
## Chemistry

Using the equation: 2C2H6 + 7O2--> 4CO2 + 6H20 How many moles of CO2 are produced by the reaction of 21.0 mol O2? Again, not sure how to write it correctly, but if I multiply 7O2 by 3, then I should do the same to the other side of the equation to make it

*asked on February 19, 2016* -
## math

A pair of dice is rolled.What is the probability that the sum of the pips is either an even number on a multiple of 3? total number of space is 36.

*asked on February 4, 2016* -
## Physics

Three positive point charges are located at the corners of a rectangle. Find the electric field at the fourth corner if q1 = 5 nC, q2 = 6 nC, and q3 = 7 nC. The distances are d1 = 0.6 m and d2 = 0.2 m. (Let the positive x-direction be to the right, and the

*asked on January 18, 2016* -
## Algebra 2

For the function f(x)=square root 3x-2 find the value of the expression below. What value of x makes f(x)=6

*asked on October 11, 2015* -
## Physics

Basically... distance is 4 km Takes 4 min to go down river Takes 6 min to come up How fast is the river?

*asked on September 22, 2015* -
## Statistics/probability

You are considering two mutual funds for your investment. The possible returns for the funds are dependent on the state of the economy and are given in the accompanying table. State of the Economy Fund A Fund B Good 20% 40% Fair 10% 20% Poor -10% -40% You

*asked on September 13, 2015* -
## Physics-Trajectory

A particle's trajectory is described by x =(12t3−2t2)m and y =(12t2−2t)m, where t is in s. What is the particle's speed at t=0s ? What is the particle's speed at t=5.0s ? Express your answer using two significant figures. What is the particle's

*asked on September 11, 2015* -
## geometry

Given: AC perpendicular BD and AB congruent CB. Prove AD congruent CD. It is a kite figure. I need statements and reasons. Problem states Plan: prove triangle ABE congruent CBE. The use congruent corresponding parts AE and CE to show right triangle AED

*asked on April 10, 2015* -
## Physicsl

What is the magnitude of the electric field a distance 3.5mm from an electron?

*asked on April 5, 2015*