Sunday

February 19, 2017
Total # Posts: 111

**solar energy**

If the price for Wp of a PV panel is €1 and the external costs are €400, and considering an efficiency of electricity to heat conversion of 85%, how much (in €) will it cost to cover 5805 W of energy with PV technology?

*January 18, 2017*

**Physics**

Please answer quick

*December 30, 2016*

**Physics**

The occupants of a car traveling at a speed of 30 m/s note that on a particular part of a road their apparent weight is 15% higher than their weight when driving on a flat road. a. Is that part of the road a hill or a dip? b. What is the vertical curvature of the road? Please ...

*December 30, 2016*

**Math**

A person has $5 and $10 bills. In total they have 26 bills that equal to $210.

*December 9, 2016*

**physics**

A force is applied to a 3 kg mass and produces 5 m/s 2 acceleration. What acceleration would be produced by the same force applied to a 12.2 kg mass? Answer in units of m/s 2 .

*December 4, 2016*

**Physics**

Starting from rest at 10m to the left of the origin (the starting line of a race), a go-kart undergoes constant acceleration of 2.46 m/s2. Make a table calculating the karts position and velocity at 10 second intervals from t=0 to 60 seconds. I have created the table but I ...

*September 18, 2016*

**Algebra**

Henry purchased x apples; Jack purchased 10 less than 1/3 of apples Henry purchsed

*June 22, 2016*

**trig**

Solve triangle ABC. (If an answer does not exist, enter DNE. Round your answers to one decimal place.) a = 63, c = 50, ∠C = 53°

*April 19, 2016*

**Math**

Sue's Organic sells a 24-ounce jar of peanut butter that costs 5 less per ounce than their 16-ounce jar. What is the total price of their 24-ounce jar of peanut butter?

*January 12, 2016*

**Differentials (calc)**

Hello, everybody let's get started

*December 7, 2015*

**Chemistry**

What minimum volume of 14.0 M hydrochloric acid would be required to completely dissolve a 600.0 −g iron bar? I'm getting around 2.3 L but it's saying it's incorrect...

*November 18, 2015*

**Chemistry**

A 0.120 g sample of a diprotic acid of unknown molar mass is dissolved in water and titrated with 0.1218 M NaOH. The equivalence point is reached after adding 12.4 mL of base. What is the molar mass of the unknown substance?

*November 15, 2015*

**Chemistry**

A 0.120 g sample of a diprotic acid of unknown molar mass is dissolved in water and titrated with 0.1218 M NaOH. The equivalence point is reached after adding 12.4 mL of base. What is the molar mass of the unknown acid?

*November 15, 2015*

**Chemistry**

A 0.120 g sample of a diprotic acid of unknown molar mass is dissolved in water and titrated with 0.1218 M NaOH. The equivalence point is reached after adding 12.4 mL of base. What is the molar mass of the unknown acid?

*November 15, 2015*

**Chemistry**

What is the minimum volume of 2.6 M HBr required to completely dissolve 35.0 g of potassium metal?

*November 14, 2015*

**Physics**

A quarterback throws a football toward a receiver with an initial speed of 22 m/s at an angle of 30° above the horizontal. At that instant the receiver is 23.6 m from the quarterback. With what constant speed should the receiver run in order to catch the football at the ...

*October 27, 2015*

**Regents biology**

Baby chickens require a constant source of food.As chick's grow,more energy is required for daily activities.The following table gives the grams of food eaten by a chuck over a five day period:

*October 21, 2015*

**Chemistry**

In one experiment, 7.62 g of Fe are allowed to react with 8.67 g of S. What is the limiting reagent, what is the mass of FeS formed, and how much excess reagent is left, respectively? I am not sure how to solve this. I started by doing (7.62 g Fe/55.85 g)=.137 g (8.67g S/32.07...

*September 14, 2015*

**Physics**

A cyclist travels a distance of 1200m due north before going 2000m due east followed by 500m south-west. Draw a scale diagram to calculate the cyclist's final displacement form her initial position?

*August 16, 2015*

**math**

Yuron is sketching a scale drawing of a famous painting. The painting is 54 inches wide and 72 inches long. He used a scale factor of 2/3 to make his sketch. How many inches wide is Yuron’s sketch?

*July 22, 2015*

**Math Calc**

If a ball is thrown vertically upward from the roof of 48 foot building with a velocity of 112 ft/sec, its height after t seconds is s(t)=48+112t–16t^2. What is the maximum height the ball reaches "in ft"?What is the velocity of the ball when it hits the ground...

*May 1, 2015*

**Math**

5400

*April 30, 2015*

**Math**

Of 1901 people who came into a blood bank to give blood, 315 people had high blood pressure. Estimate the probability that the next person who comes in to give blood will have high blood pressure

*April 1, 2015*

**math**

0=240

*February 26, 2015*

**math**

on a map, the key indicates that 2.5 centimeters equals 10 miles. a road on the map runs for 30 centimeters. how long is the road?

*January 31, 2015*

**chemistry**

ow many grams of aluminum chloride must decompose to produce 78.3 milliliters of aluminum metal, if the density of aluminum is 2.70 g/mL? Show all steps of your calculation as well as the final answer. (5 points) AlCl3 → Al + Cl2

*November 3, 2014*

**physics**

a warehouse employee is pushing a 38 kg desk across a floor at a constant speed of 0.4 m/s. How much work must the employee do on the desk to change the speed of 1.5m/s?

*November 2, 2014*

**Calculs I**

780000

*November 2, 2014*

**Physics**

The answer is B because, in reality, the force of gravity on astronauts, just depends on their masses which do not change, though the spacecraft is subjected to an acceleration upward. Due to the acceleration of the spacecraft, is exerted on the astronaut additional ...

*July 1, 2014*

**Geometry**

Given that the ratios of the perimeter of two similar shapes is 3/5, what is the ratio of their perimeters.

*June 5, 2014*

**math**

Find all numbers that are not in the domain of the function. Then give the domain using set notation? F(x)=________17over xSquare+4x-12

*April 13, 2014*

**Algebra**

Maria and Charlie can deliver 50 papers in 2 hours. How long would it take them to deliver 35 papers? formula please

*April 5, 2014*

**Physical Geography**

Assume that a parcel of air is forced to rise up and over a 6000-foot high mountain (shown below). The Initial temperature of the parcel at sea level is 76.5 F, and the lifting condensation level (LCL) of the parcel is 3000 feet. The DAR is 5.5 F/1000' and the SAR is 3.3 F...

*January 20, 2014*

**Chemistry**

1.3 x 10^22

*December 10, 2013*

**math**

well nevermind ._.

*June 20, 2013*

**math**

The range is basically all the values that can come out from plugging something in (in other words, every answer that the equation can have). In order to find the range, you need to graph this equation. Once you have the graph, find which point the asymptote(the dashed line) ...

*June 20, 2013*

**maths**

First, you must find the percentage of boys who came from the city. Since 70% of students who came from the city were girls, then 30% were boys. Next, you must find how many total students were from the city using the proportion: # of boys from the city/total students from ...

*June 19, 2013*

**English**

What is the difference between antimetabole and chiasmus?

*June 19, 2013*

**math**

11/16-12/16

*June 8, 2013*

**science**

suppose you are standing on a sidewalk . describe your motion relative to the car and the plane

*April 19, 2013*

**physics**

a40w motor conectedto a 9v battery can lift an object 40m in 10s

*March 21, 2013*

**physics**

A 0.26 kg rock is thrown vertically upward from the top of a cliff that is 32 m high. When it hits the ground at the base of the cliff the rock has a speed of 28 m/s. (a) Assuming that air resistance can be ignored, find the initial speed of the rock. (b) Find the greatest ...

*November 29, 2012*

**science**

I came up with: EI-F = 0.5[EI-I + EF-F] + (χF – χI)2 EI-F = 0.5[1.5546+ 1.6583] + (3.98 – 2.66)2 Solving this gives EI-F = 3.34885 eV = 323 kJ/mol Similarly ECl-F = 265 kJ/mol and EI-Cl = 219 kJ/mol So to break the I-Cl bond, Wavelength of radiation= 6....

*November 16, 2012*

**chemistry**

idk

*November 9, 2012*

**statistics.. URGENT!! PLZ!!**

.1336

*November 6, 2012*

**Physics**

im trying to study for my exam by doing problems, however im stuck with this one. any help is appreciated In doing a load of clothes, a clothes drier uses 16 A of current at 240 V for 59 min. A personal computer, in contrast, uses 2.3 A of current at 120 V. With the energy ...

*September 26, 2012*

**Geometry**

Idk Idk idk

*September 7, 2012*

**Pre- Algebra**

I'm not going to just answer these for you. So here goes: the symbol "^" is called a caret. It is the mathematical sign for an exponent. It is simply a shorthand way of writing a set of repeating multiplications, just like multiplication is shorthand for addition...

*September 5, 2012*

**math**

If Joe throws a pair of six-sided dice and records the sum of the first throw, how many more times must Joe throw the dice to ensure that he records the same sum as the first throw?

*September 5, 2012*

**7th Grade Science**

It's asking how the people would move around in relation to each other as water and then as vapor. Water is heavier than air and the molecules connected by hydrogen bonding, and tend to stay close to each other, all moving together. Hence, in a room, it would be a group of...

*September 4, 2012*

**Microecomics**

Assume that American rise sells for $100 per bushel, Japanese rice sells for 16,000 yen per bushel, and the nominal exchange rate is 80 yen per dollar. Explain how you could make a profit from this situation. What would be your profit per bushel of rice? If other people ...

*July 16, 2012*

**math algebra**

Solve the following system using elimination. If a single solution exists, write the solution as an ordered pair. Your answer will be an ordered pair, no solution, or infinitely many solutions. -a+b=-4 2a-3b=-2

*May 3, 2012*

**College Algebra**

Got it thanks. I had gotten up to the equation but completely forgot to plug it into the quadratic to get my answer of 12.845 Thanks again.

*May 2, 2012*

**College Algebra**

The parking lot is 25 by 40 feet. The owner wants to enlage the parking lot by paving an equal width strip on the north side and east side of the lot, sot hat the new lot will be twice the area of the old one. Find the equation which has as a root the proper width of the strip.

*May 2, 2012*

**math**

Anita and Maria went to the candy store. Maria bought 5 pieces of fudge and 3 pieces of bubble gum for a total of $5.70. Anita bought 2 pieces of fudge and 10 pieces of bubble gum for a total of $3.60. Determine the cost of 1 piece of bubble gum.

*May 1, 2012*

**algebra**

Anita and Maria went to the candy store. Maria bought 5 pieces of fudge and 3 pieces of bubble gum for a total of $5.70. Anita bought 2 pieces of fudge and 10 pieces of bubble gum for a total of $3.60. Determine the cost of 1 piece of bubble gum.

*May 1, 2012*

**math**

Solve the following system using substitution. Write the solution as an ordered pair, (a, b). b = a – 4 2a – 3b = -2

*April 30, 2012*

**math**

The sum of the 3 angles of a triangle is 180 degrees. In triangle PQR, the largest angle is twice the size of the smallest angle. The remaining angle is 16 degrees larger than the smallest. Write and solve an equation to find the size of the smallest angle in degrees.

*April 5, 2012*

**MATH**

A name tag is 6.7 centimeters long. How many meters long is it

*March 5, 2012*

**math**

i need help here is the question. Leena bought 93 yards of wire. How many of wire did she buy

*March 5, 2012*

**physics**

A ball is thrown at a rate of 25m/s. The ball travels 138 meters. How long does it take the ball from start to end?

*February 20, 2012*

**Biochemistry**

Give the sequence of a reverse primer used to insert a BamHI site (GGATCC) at the 3' end of the following sequence: 5' CTGAACGTCCAAGGCTTAA 3' 3' GACTTGCAGGTTCCGAATT 5' Make sure you indicate your primers polarity.

*February 1, 2012*

**Physics**

1) An 8.5kg bowling ball dropped 11m hits the ground 1.5 seconds later. What is the magnitude of the force acting on the ball during the fall? 2) Shuttle astronauts climb at a rate of 24.5m/s^2 shortly after takeoff. What apparent weight would a 95kg astronaut have during this...

*December 22, 2011*

**common factors**

you forgot to put the answer for 24/84

*December 1, 2011*

**common factors**

18/36=2/6,5/7

*December 1, 2011*

**Books**

i love you Lila

*October 15, 2011*

**English**

Write your own journal entry from the perspective of a member of Bradford's colony. What do you think of these unruly pirates? What shocks you the most about these surly characters? How do the manners of the pirates differ from yours? Visit the Calvinism in New England ...

*September 15, 2011*

**math**

classify each statement as sometimes, always, or never true. give examples or properties to support your answer d+ (-d)=0

*August 17, 2011*

**Spanish**

11.) El profesor_chinga__, y el estudiante_se pajea__. A-termina las clase, empieza la clase B-ensena, estudia C-ensenar mucho, estudiar D-empieza la clase, terminar 18.)___. tocas la guitarra? this is wrong.. should be Juana, me tocas el organo? y te lo puedo meter! A- ...

*August 10, 2011*

**chemistry**

How many grams of HCL are required to produce 224 liters of CL2at stp

*June 14, 2011*

**math**

what question can i make with a picture that has 2 triangles,3 quadrilateral,and 4 pentagons?the answer is 38.

*May 26, 2011*

**Pre-Algebra 7th Grade**

I need help with this problem: Suppose you design a second model car that is 1/4 the size of the model car you designed in Excercise 9.What is the perimeter of the license plate on the second model car? Let me explain.The perimeter of the actual car's license plate was 36 ...

*March 28, 2011*

**math**

I don't think anyone on this site can do this problem, not even the experts.

*February 27, 2011*

**geometry**

Thanku sooo much!

*February 8, 2011*

**geometry**

The altitude upon the hypotenuse of a right triangle divides the hypotnuse into segments of 3 and 12. find the length of the altitude

*February 8, 2011*

**math**

15,000

*January 9, 2011*

**math**

Mr.kale received 4000 votes,Mrs. Chalker received 6000 votes,and Mr.rains received 1/3 of the votes. What was the total number of votes casted

*January 9, 2011*

**Social Studies**

..

*October 31, 2010*

**Chemistry**

A volume of 45.3mL of .719 M Ca(NO3)2 solution is mixed with 82.3mL of 1.409M Ca(NO3)2 solution calculate the concentration of the final solution

*October 10, 2010*

**calculus**

A spherical balloon is inflated so that its volume is increasing at the rate of 2.2 ft^3/min. How rapidly is the diameter of the balloon increasing when the diameter is 1.2 feet?

*October 6, 2010*

**Physics**

You are pulling a suitcase through the airport at a constant speed. the handle of the suitcase makes an angle of 45 degrees with respect to the horizontal direction. if you pull with a force of 7.5N parallel to the handle, what is the force of friction acting on the suitcase?

*September 15, 2010*

**math 5 grade**

Write the longest multiplication combination you found for each of these numbers

*September 13, 2010*

**Algebra 1**

slove (8w+2)(w+5)

*May 12, 2010*

**physics**

No glass is perfectly transparent. Mainly because of reflections, about 94% of light passes through an average sheet of clear windowpane. The 6% loss is not noticed through a single sheet, but through several sheets it is apparent. How much light is transmitted by two sheets?

*April 5, 2010*

**math**

guess my rule with two rules

*March 22, 2010*

**algebra**

yeah...kinda. think about what 5 squared is. 25, and something squared plus another thing squared will equal 25. try 3 and 4...(:

*November 17, 2009*

**Algebra**

thanks a lot, bob

*November 17, 2009*

**Algebra**

factor the expression x(a+2) - 2(a+2) i missed this day because i was sick...please explain!

*November 17, 2009*

**math**

From: Doctor Schwa Subject: Re: I don't understand functions and function tables One way to think of a function is as a rule. You give it some object, and it replies with some other object. For example, a catalog for a shirt company might have a function called price, and ...

*November 17, 2009*

**Economics**

The estimated demand equation is Q = 112,000 – 500P + 5(20,000) = 212,000 – 500P. The inverse demand function is P = 424 – 0.002Q The marginal revenue is MR = 424 – 0.004Q The average variable cost is AVC = 200 – 0.012Q + 0.000002Q2 The marginal cost ...

*July 31, 2009*

**Managerial Economics**

The reason this cannot be worked out is because there is an extra 0 on the first term in the AVC = 2000 – 0.012Q + 0.000002Q2. It should really be AVC = 200 – 0.012Q + 0.000002Q2.

*July 31, 2009*

**Microbio**

Please write a one paragraph abstract arguing for or against one of the following statements: Hormone replacement therapy is carcinogenic Water fluoridation causes bone cancer Regulation of carcinogens should take hormesis into account Aneuploidy, not oncogenes, should be the ...

*March 26, 2009*

**Physics**

how do i do a diagram?

*March 26, 2009*

**Physics**

Given that the distance between the Earth and the Moon is d = 3.84 x 10^8 m, show that a satellite located exactly in-between the Earth and the Moon at a distance of 90% d from the Earth experiences no net force (at least when only the gravitational force due to the Earth and ...

*March 26, 2009*

**Physic**

Given that the distance between the Earth and the Moon is d = 3.84 108 m, show that a satellite located exactly in-between the Earth and the Moon at a distance of 90% d from the Earth experiences no net force (at least when only the gravitational force due to the ...

*March 26, 2009*

**MATH**

Addition of Polynomials (w^2 -2w+1) + (2w-5+w^2)

*March 2, 2009*

**MATH**

9.3 X 10^-5 This is a question...

*February 27, 2009*

**MATH**

THAT IS A QUESTION...

*February 27, 2009*