Friday

October 21, 2016
Total # Posts: 281

**algebra**

If f(x) = 2x and g(x) = ½ , calculate f(x) • g(x) A. x B. x2 C. 2x D. 2x2 I say B

*February 3, 2013*

**Physics**

A mass m1 = 4.1 kg rests on a frictionless table and connected by a massless string to another mass m2 = 5.9 kg. A force of magnitude F = 32.0 N pulls m1 to the left a distance d = 0.83 m. 1) How much work is done by the force F on the two block system? 2) How much work is ...

*January 2, 2013*

**Msth**

CBDAC is 100% correct :-)

*December 12, 2012*

**physics**

Calculate the speed of a 10,000 kg airliner with a kinetic energy of 3.1 x 10^9 J.

*December 1, 2012*

**physics**

Calculate the speed of a 10,000 kg airliner with a kinetic energy of 3.1 x 10^9 J.

*December 1, 2012*

**Math**

37% of college students say they use credit cards because of the rewards program. You randomly select 10 college kids and ask each to name the reason he or she uses credit cards. Find the probability that the number of college students who say they use credit cards because of ...

*November 25, 2012*

**chemistry**

whoops D

*November 24, 2012*

**chemistry**

solve the following and express your answer in scientific notation: (5.3 x 10^4) + (1.3 x 10^3) A. 5.4 X 10^4 B. 5.4 X 10^8 C. 6.6 X 10^7 D. 6.9 X 10^7 I say c

*November 24, 2012*

**chemistry**

got it now B

*November 24, 2012*

**chemistry**

one isotope of chromium (atomic number 24) has an atomic mass of 53 amu. how many neutrons are in this particular isotope of chromium? A. 24 B. 29 C. 53 D. 77 I say A

*November 24, 2012*

**chemistry**

amphetamine (c9h13n) is a powerful stimulant. what is the percent composition of all of the elements in this compound? A. 9%C;13%H;1%N B. 30%C;10%H;60%N C. 60%C;35$H;5%N D. 80%C;9.6%H;10.4%N I think b

*November 23, 2012*

**chemistry**

C. 81.8%

*November 23, 2012*

**chemistry**

what is the percent by mass of carbon in c3h8? A. 18.20% B. 20.0% C. 81.8% D. 85.0% I say A

*November 23, 2012*

**chemistry**

how many moles are in 243.6 g caco3? A.7.41 mol caco3 B 2.43 mol caco3 C.102.46 mol caco3 D.88.1 mol cao3 I say A

*November 23, 2012*

**chemistry**

a compound is found to be 94.1% o and 5.90% h. its molecular mass is 34.0. what is its molecular formula A. H3O2 B. OH C. H2O D. H2O2 I think D

*November 23, 2012*

**Physics**

A roller coaster is initially at a height of 40 m above the ground and has an initial velocity of 15 m/s. Using conservation of energy, find the velocity of the roller coaster at a height of 5 m above the ground.

*November 21, 2012*

**chemistry**

in the formula for calcium bromide (CaBr2), what does the subscripted two indicate? A. the bromide atom has a charge of 2- B. the bromide atom has a charge of 2+ C. there are two bromide atoms for every calcium atom. D. there are two calcium atoms for every bromide atom I say C.

*November 20, 2012*

**chemistry**

what is the formula for the arsenic ion. A. As3- B. As2- C. As, D. As3+ I say c.

*November 20, 2012*

**chemistry**

how many electrons does Fe3+ gain or lose when the ion forms? A. gains 1 electron B. loses 1 electron C. gain 3 electrons D. loses 3 electrons I think D.

*November 20, 2012*

**chemistry**

the fluoride anion always carries a charge of 1- true or false I say true

*November 20, 2012*

**chemistry**

Lithium-6 has an atomic number of 3. How many electrons are in this isotope? A. 0 electrons B. 3 electrons C. 6 electrons D. 9 electrons I think C. 6

*November 19, 2012*

**chemistry**

Lithium-6 has an atomic number of 3. How many protons are in this isotope? A. 0 protons B. 3 protons C. 6 protons D. 9 protons I think 3

*November 19, 2012*

**chemistry**

boron-10 has an atomic number of 5. how many electrons are in this isotope? 0 electrons, 2 electrons, 5 electrons, 10 electrons. I think 10

*November 19, 2012*

**chemistry**

boron-10 has an atomic number of 5. how many neutrons are in this isotope? 0 neutrons, 2 neutrons, 5 neutrons, 10 neutrons. I say 5

*November 19, 2012*

**chemistry**

the idea of the atom was first proposed by john dalton. true or false false

*November 19, 2012*

**chemistry**

Actinides and Lanthanides are elements in group 3A. true or false I say false

*November 19, 2012*

**chemistry**

Lithium-6 has an atomic number of 3. how many neutrons are in this isotope? A. 0 neutrons, B. 3 neutrons, C. 6 neutrons, D. 9 neutrons I say B

*November 19, 2012*

**Math for Ms. Sue Or Steve**

Ms Sue, stop it with the insults! Thats not cool!

*November 14, 2012*

**chemistry**

guessed

*November 10, 2012*

**chemistry**

meant A

*November 10, 2012*

**chemistry**

What is the molar mass of hydrogen? A. 1.01 g/mol B. 11.01 g/mol C. 101.1 g/mol D. .0111 g/mol D

*November 10, 2012*

**chemistry**

How many atoms are in 3.14 mol of methane (CH4)? A. 7.56 x 1023 atoms B. 7.56 x 102 atoms C. 7.56 x 104 atoms D. 7.56 x 1024 atoms D

*November 10, 2012*

**chemistry**

What is a problem-solving technique that uses equivalent measurements in ratio form to solve problems? A. Avogadro's number B. Conversion C. Dimensional analysis D. The mole concept A

*November 10, 2012*

**chemistry**

In order to determine the number of atoms in a compound, you must know the number of atoms in a representative particle of the compound. True False i think false

*November 10, 2012*

**chemistry**

How many moles are in 4.81 x 1024 atoms Na? A. 0.799 mol Na B. 7.99 mol Na C. 481 mol Na D. 7.99 x 10-1 mol Na B

*November 10, 2012*

**chemistry**

How many atoms are in 1.14 mol of propane (C3H8)? A. 7.55 x 1023 atoms B. 7.77 x 1024 atoms C. 7.55 x 1024 atoms D. 7.55 x 1030 atoms C

*November 10, 2012*

**chemistry**

How many moles of magnesium is 1.25 x 1023 atoms of magnesium? A. 0.208 × 101 mol Mg B. 2.08 × 101 mol Mg C. 2.08 × 10 -1 mol Mg D. 20.8 mol Mg I think it would be D

*November 10, 2012*

**chemistry**

What is the gram molecular mass of C2H6? A. 8.0 g B. 30.0 g C. 40.0 g D. 50.0 g think B

*November 10, 2012*

**chemistry**

What is the gram fomula mass of calcium carbonate (CaSO4)? A. 6 g B. 136.2 g C. 230.0 g D. 235.4 g think B

*November 10, 2012*

**chemistry**

thank you

*November 10, 2012*

**chemistry**

The chemical explosive nitroglycerine has the formula C3H5(NO3)3. How many oxygen atoms are in the formula unit for this compound? A. 3 B. 6 C. 9 D. 12 C. 9

*November 10, 2012*

**chemistry**

The water molecule (H2O) is composed of 2 atoms of hydrogen and one atom of oxygen. What is the mass of one mole of water? A. 3 g B. 18 g C. 6 g D. 6.02 x 1023 g B. 18 g

*November 10, 2012*

**math**

On a cold winter day, the temperature is -10.0º C. What is the reading on the Fahrenheit scale? A. 10.0 oF B. 12.0 oF C. 13.0 oF D. 14.0 oF I say A

*November 7, 2012*

**math**

The temperature of the water around a nuclear reactor core is about 300 oC. what is this temperature in degrees Fahrenheit? A. 27 oF B. 332 oF C. 572 of D. 573 oF I say D

*November 7, 2012*

**math**

Solve the following and express the answer in scientific notation: (5.4 x 10^4) x (4.5 x 10^8) A. 2.4 x 10^10 B. 24 x 10^11 C. 24 x 10^12 D. 2.4 x 10^3 I say D

*November 7, 2012*

**Science**

The "resistant" threshold for gemifloxacin is >1 mg/L while the "resistant" threshold for sulfamethoxazole is >512 mg/L. Explain why there might be this great disparity of values in resistance thresholds (512-fold) for each antibiotic ...

*November 6, 2012*

**physics**

thanks, but how come m is not in kg?

*October 3, 2012*

**physics**

Just an explanation without numbers would be awesome, i just want to understand the correct steps to take. Thanks!

*October 3, 2012*

**physics**

Ice fishing equipment weighing 3,000 N is pulled at a constant speed V = 0.5 m/s across a frozen lake by means of a horizontal rope. If the coefficient of kinetic friction is 0.05, what is the work done (in J) by the fisherman in pulling the equipment a distance of 500 m?

*October 3, 2012*

**Chemistry**

got it thanks!

*September 19, 2012*

**Chemistry**

Another hour gone by working on this and i still can't figure it out. Im totally lost!

*September 19, 2012*

**Chemistry**

A mixture of ethane and ethene occupied 35.5 L at 1.000 bar and 405 K. This mixture reacted completely with 110.3 g of O2 to produce CO2 and H2O. What was the composition of the original mixture? Assume ideal gas behavior Im pretty sure i use dalton's law of partial ...

*September 19, 2012*

**Physics**

A tennis ball is thrown horizontally from an elevation of 20.60 m above the ground with a speed of 19.0 m/s. (a) Where is the ball after 2.00 s for the horizontal and vertical position? (b) If the ball is still in the air, how long before it hits the ground? If the ball is ...

*September 13, 2012*

**Math**

Fiind the area bounded by the parabola y^2 = 8x, the x axis and the line x=2

*August 21, 2012*

**Physics**

a quarter sits at the bottom of a wishing well where the gauge pressure reads 294 kPa. If the quarter has a diameter of 24mm, what is the total force acting on the top surface of the quarter? Note: Atmospheric pressure = 101.3

*August 20, 2012*

**Calculas**

square root of 2x

*July 24, 2012*

**Calculas**

Find the length of the curve y=ã(2x), from x=1 to x=4.

*July 24, 2012*

**chemistry**

Nitrogen-13 has a half-life of 10 minutes. Given a starting mass of 2.00 g of nitrogen-13, how many grams will remain at the end of 30 minutes?

*June 19, 2012*

**chemistry**

What is the molarity of the solution produced when 14.1 grams of ammonia is dissolved in sufficient water to prepare .100 liters of solution?

*May 22, 2012*

**calculus**

yes, i pretty sure i got it as my answer mathes the back of the book

*April 23, 2012*

**calculus,1**

we got a few examples in class but not understanding it at all

*April 23, 2012*

**calculus**

Can someone please show steps as I am having a hard time understanding. The position (in meters) of a particle is modeled by y=x^3-12.5x^2+51x-67.5, where xis in seconds. Find the max, min and point(s) of inflection.

*April 23, 2012*

**calculus**

This is just for study for exam coming up and says it could be worth up to 12 marks. Not understanding vry well the two

*April 23, 2012*

**calculus**

The position (in meters) of a particle is modeled by y=x^3-12.5x^2+51x-67.5, where xis in seconds. Find the max, min and point(s) of inflection.

*April 23, 2012*

**calculus**

A balloon is being filled at a rate of 4000 cm^3/min. How fast is the surface area of the ballon increasing when the radius is 125 cm? V=4/3pir^3, SA=4pir^2

*April 23, 2012*

**physics**

A certain dog whistle operates at 23.5 kHz, while another (brand X) operates at an unknown frequency. If neither whistle can be heard by humans when played separately, but a shrill whine of frequency 9200 Hz occurs when they are played simultaneously, estimate the operating ...

*April 23, 2012*

**Physics (Energy and Momentum)**

You are given V and are solving for dM/dt what do you set it equal to?

*April 17, 2012*

**physics**

what is the wave equation?

*April 16, 2012*

**physics**

FM radio signals are electromagnetic waves transmitted between frequencies of 88 MHz and 107 MHz. Find the range of wavelengths for these signals. largest___m smallest___m

*April 16, 2012*

**calculus**

Use Newtons method to find the roots of the equation 1/x=1+x^3

*April 4, 2012*

**Algebra 2**

Hi I need help. Can you show me how to solve this problem? Radical Inequalities. -2 + square root 9-5x greater than or equal to 6

*April 3, 2012*

**trig**

Find the other endpoint of the line segment with the given endpoint and mid point. 1. Endpoint:(-1, 9), midpoint: (-9, -10) 2. Endpoint: (2, 5), midpoint: (5, 1) 3. Endpoint:(9, -10), midpoint: (4, 8)

*March 28, 2012*

**Math**

Find the discriminant. Tell which conic section the graph will be. 3x^2 + 12 xy + 9y^2 + 7x -2y - 100

*March 11, 2012*

**managerial economics**

Qd=15.0-0.2P where Qd is annual quantity demanded in millions of units and P is the wholesale price. Incurred cost of $60 million. Production cost is $5/unit. (1) what is wholesale price, (2) production annually, (3) annual profit? Given this is a monopoly with an expiring ...

*February 29, 2012*

**trig**

does sec(x)tan(x)*tan(x)=[sec(x)(tan^2)x]

*February 23, 2012*

**chemistry**

what are three common ores from which copper can be extracted

*February 22, 2012*

**geometry**

How tall is a tower if it casts a shadow 65 ft long at the same time that a building 160 ft tall casts a shadow 130 ft long?

*February 16, 2012*

**Algebra**

How do you solve: (2x+1)(x-4)=0

*February 1, 2012*

**Language**

thank you

*January 30, 2012*

**Language **

3 disadvantages for town crying

*January 30, 2012*

**chemistry**

A solution was made by dissolving 10.0g of a nonvolatile nonelectrolyte compound in 100.0g of water froze at -0.93C. What is the approximate molecular weight of the substance. (for water..kf=1.86C/m) (m is molality)

*December 12, 2011*

**chemistry**

D=[mol.wt*P)/(R*T) D=(29.0 g/mol*0.97atm)/[(0.0821 atm*L/mol*K)*(303.15 K)] =1.13 g/L

*December 12, 2011*

**calculus**

Given f''(x)=5x−6 and f'(−3)=−6 and f(−3)=2. find f'(x) and f(1)

*November 19, 2011*

**physics**

A missile's trajectory takes it to a maximum altitude of 1300Km. If its launch speed is 5.9 Km/s, how fast is it moving at the peak of its trajectory? answer is in Km

*October 20, 2011*

**Physics.. please help!!!!!**

The third question is wrong...

*October 20, 2011*

**physics**

2.16km

*September 17, 2011*

**Math Help**

700-284=?

*September 13, 2011*

**Physics**

A frog in a hemispherical bowl, as shown below, just floats in a fluid with a density of 1.26*10e3 kg/m3. If the bowl has a radius of 6.16 cm and negligible mass, what is the mass of the frog?

*June 28, 2011*

**business**

Specialization

*April 20, 2011*

**social studies**

vgvg,c

*March 24, 2011*

**social studies**

describe 2 details about the life of the Incas

*March 19, 2011*

**math**

Jeff is thinking of a function machine.He says that the output is 5 when the input is 4.What are two different rules that he could be thinking of.

*March 10, 2011*

**physics**

train is approaching the station at a speed of 20m.s sounds a 220 hz horn. What frequency does an observer on the station platform hear

*February 28, 2011*

**physics**

What do we know? r=6.38x10^6m T=1 day=86,400s Part A: T=2(pi)r/V ==> V=2(pi)r/T a=V^2/r (Plug & chug) Part B: Now, what do we know? Only T=1 day=86,400s. We no longer know r. Latitude we'll say is represented by "l". So r(l) = r cos l Once you find that radius...

*February 23, 2011*

**ESSAY NEED HELP PLEASE**

I would help but I'm working on one now

*January 24, 2011*

**Physics**

A car is approach a corner too fast and locks up the brakes at point A and holds them on for 12.5 M to point B. The car then moves from point B at a constant speed and does into the corner. At Point C because the car is still going to fast it goes out of control and leave the ...

*January 20, 2011*

**chemistry**

What products are formed when sucrose is heated in an aqueous sulfuric acid solution? What role does the acid play?

*January 16, 2011*

**math**

HELP ME!!! One of your friends missed the class on scientific notation. Describe how you would explain to your friend what it means for a number to be in scientific notation and how to convert a number from standard form to scientific notation.

*January 10, 2011*

**math**

its =

*January 10, 2011*