Thursday

December 8, 2016
Total # Posts: 1,809

**physics**

The drawing shows box 1 resting on a table, with box 2 resting on top of box 1. A massless rope passes over a massless, frictionless pulley. One end of the rope is connected to box 2, and the other end is connected to box 3. The weights of the three boxes are W1 = 56.2 N, W2...

*June 30, 2013*

**physics**

The drawing shows a person looking at a building on top of which an antenna is mounted. The horizontal distance between the person’s eyes and the building is 87.8 m. In part a the person is looking at the base of the antenna, and his line of sight makes an angle of 30.3o ...

*June 27, 2013*

**geometry**

How to draw line segment CF and to draw a ray CD perpendicular to line segment CF.

*June 24, 2013*

**Melting Ice Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of -10 degrees Celsius. How much heat energy(in joules) is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. ...

*June 14, 2013*

**Melting Ice Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of -10 degrees Celsius. How much heat energy(in joules) is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. ...

*June 14, 2013*

**Melting Ice Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of -10 degrees Celsius. How much heat energy(in joules) is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. ...

*June 14, 2013*

**Melting Ice Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of -10 degrees Celsius. How much heat energy(in joules) is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. ...

*June 14, 2013*

**Melting Ice Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of -10 degrees Celsius. How much heat energy(in joules) is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. ...

*June 14, 2013*

**Melting Ice Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of -10 degrees Celsius. How much heat energy(in joules) is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. ...

*June 14, 2013*

**Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of -10 degrees Celsius. How many joules is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. 418.2 J

*June 14, 2013*

**Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of 20 degrees Celsius. How many joules is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. 418.2 J

*June 14, 2013*

**Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of 20 degrees Celsius. How many joules is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. 418.2 J

*June 14, 2013*

**chemistry**

Good guess, that's why we need to help each other

*May 30, 2013*

**trig**

okay, thank you, would that still apply if it was cot4x=1-tan^2(2x)/2tan2x? because ive got the right side for this one but the cot4x is throwing me off, how would you solve that side?

*May 23, 2013*

**trig**

TRIG Identities, Gr. 12: Prove: cot4x=1-tan^2x/2tan2x

*May 23, 2013*

**physics**

A package weighing 75 N is sitting on a coffee table. The package is cubic with edges of 10 cm. How much pressure does the package exert on the table?

*May 21, 2013*

**physics**

In a city grid, each block on the east-west streets is 100 meters long. Each block on the north-south streets is 20 meters long. A walker walks 4 blocks west and then 4 blocks south. How much father did the walker travel than the actual distance between the start and end ...

*May 17, 2013*

**math**

rewrite the expression by factoring out (v+5) 5v^2(v+5)+3(v+5)

*May 8, 2013*

**Math**

The Distance from the top of a cliff to the water below ranges from 13m(low tide) to 8m(high tide). Low tide occurs at 12:00 noon and it takes six hours between low tide and high tide. a)Develop an equation representing the distance in terms of time b) It is only safe to dive ...

*May 6, 2013*

**English**

Friendship. I don't know what prewriting notes mean.

*May 1, 2013*

**English**

Select one of the common terms below to redefine in your own words. Make some prewriting notes in the text box. Make sure to indicate which term you have chosen. Terms: -friendship -gratitude -disgust -isolation -accomplishment -satisfaction -hypocrisy -determination -bravery

*May 1, 2013*

**English**

Every sentence in the paragraph below violates some principle of good persuasive writing. Revise the paragraph, following the directions at the end of each sentence; use your imagination where necessary. Type the revised paragraph in the text box provided below. CAUTION: ...

*May 1, 2013*

**Chemistry**

did anyone solve this?

*April 30, 2013*

**Organic Chemistry**

A student dehydrated 12 grams of 2-methylcyclohexene with 85% H3PO4, and acquired 6.50 grams of alkene. What are the theoretical and percent yields?

*April 22, 2013*

**Organic Chemistry**

A student dehydrated 12 grams of 2-methylcyclohexene with 85% H3PO4. What are the theoretical and percent yields?

*April 22, 2013*

**Organic Chemistry**

A student dehydrated 12 grams of 2-methylcyclohexene with 85% H3PO4. What are the theoretical and percent yields?

*April 22, 2013*

**Math (Statistics)**

Two Cards are drawn without replacement from a deck of 52 cards. What are the odds in favor of drawing two honour cards (A,K,Q,J,10)?

*April 21, 2013*

**Algebra**

I have to compute the determinant of the matrix without using a calculator. If the determinant is zero, write singular matrix. 1 -1 -1 -4 2 0 0 3 1

*April 20, 2013*

**math**

160 blocks , each block is 2 cm wide, 1 cm long & 4 cm high, what will be size of box that will hold all 160 blocks (each side cannot be less than 6 cm)

*April 17, 2013*

**Math**

What are the measurements of a box that will hold 160 blocks that are 2 centimeters wide, 1 centimeter high, and 4 centimeters long?

*April 17, 2013*

**physics**

32 kg child practicing rock climbing, she feel but the rope hung on with a tension of 253N. find acceleration??

*April 16, 2013*

**Science**

Some herbicides, such as 2, 4-D are believed to make plant cells divide more rapidly than normal. Why would this kill plants? Why might this be dangerous to humans if it had the same effect on human cells?

*April 15, 2013*

**science-biology**

Some herbicides, such as 2, 4-D are believed to make plant cells divide more rapidly than normal. Why would this kill plants? Why might this be dangerous to humans if it had the same effect on human cells?

*April 13, 2013*

**life orientation**

Discuss in a paragraph of 150 words in which one can take responsibility to provide safe abd healthy livinf enviroment.

*April 11, 2013*

**Combinations and Permutations, Steve and Ms. Sue☺**

What do the stars mean on the answers help asap

*April 10, 2013*

**Math**

I am an amateur, so my answer might not be correct. If I understand this right, you are talking about a non-shaded box, 8x2, inside a larger, shaded box, 10x4. The area of the inner box is 16. The area of the outer box, 40. 40/100 = 16/x x = 1600/40 x = 40 The area of the ...

*April 8, 2013*

**PHILOSOPHY**

Check out Jeremy Bentham (1748-1822), "An Introduction to the Principles of Morals and Legislation" Chapters III and IV.

*April 8, 2013*

**Biochemistry**

In yeast, ethanol is produced from glucose under anaerobic conditions. What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions? A cell-free yeast extract is placed in a solution that contains 3.50 × 102 ...

*April 8, 2013*

**trig**

I see. A trailing ,numer; works. For asin(.8), asin(.8)*180/%pi, numer; produces 53.13... I also found that writing numbers with a trailing .0 forces approximation. And for the built-in constants, float() forces approximation. For example: a: 4.0/5.0$ disp(a)$ b: asin(a)$ ...

*April 8, 2013*

**trig**

Using b+0 doesn't phase it. The problem is getting wxMaxima to make 4/5 into a decimal. If I use a: 0.8$ b: asin(a)$ print("the angle is ", b)$ Then it works. It gives me the angle is 0.92729521800161 But if I try to convert that to degrees: c: b*180/%pi$ print(&...

*April 8, 2013*

**trig**

I am trying to get wxMaxima to give me arcsin(4/5), either in radians or degrees. I am using a: 4/5$ b:asin(a)$ print("the angle is ", b)$ But it returns the angle is asin(4/5) How do I get wxMaxima to give me the angle? I want .927 radians or 53.1 degrees.

*April 8, 2013*

**Physics**

I am not an expert. I am a very rusty amateur, so this has to be checked. But I think the difference in light travel distance you are talking about measuring is 2mm. That is, 1mm out into some 1mm deep feature in the object, and 1 mm back. Plus the 2 km there and back. But ...

*April 8, 2013*

**math**

Ok.. "The strongest recorded earthquake in the world took place in Child on May 22, 1960. It had a magnitude of 9.5 on the Richter scale. The strongest quake actually recorded in Canada was magnitude 8.1 on August 22, 1949 and occurred off the Queen Charlotte Islands. a)...

*April 8, 2013*

**Statistics**

If the average IQ is 100 with a standard deviation of 10, what percentage of the population has an IQ of at least 116?

*April 7, 2013*

**math**

yes,i did,thanks

*April 5, 2013*

**math**

row a;1,2,3,4,5............................rowb;1,2,4,8,16...........................row c;2,4,7,12,21.........................what is the first entry in row c which is greater than 100 is most likely to be ?

*April 5, 2013*

**math**

john is the age that sally was 3 years ago,13 year old elissa is 3 years older than sally,how old will john be on his next birthday?

*April 5, 2013*

**math**

tom,jack and joe are the fastest runners in the school.if they race one another,without dead heats,how many combinations can they finish in if they occupy the first 3 places ?

*April 5, 2013*

**math**

in how many different orders can 4 children be arranged in a line,if john and julie refuse to stand next to one another ?

*April 5, 2013*

**Math **

Justin rides his bike in a rectangular route. He knows the total distance is 6,188 yards and the length of the shorter side of the route is 741 yards. What is the length of the longer side ?

*April 5, 2013*

**Chemistry**

1. If a student forms CaCO3 from the presence of carbon dioxide, but continued with the trial anyway, how would this affect his/her calculations (too high, too low, or no effect)? Explain your answers. a) The volume of NaOH required for the back titration. b) The calculated ...

*April 2, 2013*

**Chemistry**

4. A 5.309 g antacid tablet, with CaCO3 as the active ingredient, was mixed was 30.0 mL of 0.831 M HCl. It took 15.3 mL of 0.7034 M NaOH to neutralize the excess acid. a) Calculate the volume of HCl neutralized by the NaOH. b) Calculate the amount of HCl (in mL) neutralized by...

*April 2, 2013*

**physical science 2nd semester**

what is the reactant in this equation ?2HBr(aq)+ca(OH)2(aq)-->2H2O(i)+CaBr2(aq)

*April 2, 2013*

**physics**

[radius (perpendicular) * sin35º] / [radius perpendicular*cos 35º] -the radius cancel and your left with.... sin35º / cos35º =.70 is the coefficient of static friction

*April 1, 2013*

**trig**

I keep trying to find the power reducing formula for sin^4(x), but I can't seem to get all the fractional parts correct. The answer I should be getting is: sin^4(x)=(1/8)cos4x-(1/2)cos2x+(3/8) I can only get this far knowing feeling confident. When I go further I start ...

*March 19, 2013*

**Chemistry**

What volume (L) of 0.256 M potassium hydroxide solution would just neutralize 61.3 ml of 0.167 M H2SO4 solution?

*March 17, 2013*

**Chemistry**

What volume (L) of 0.256 M potassium hydroxide solution would just neutralize 61.3 ml of 0.167 M H2SO4 solution?

*March 17, 2013*

**Math**

How do you change 5x15 into distributive property?

*March 12, 2013*

**math**

A nurse needs to make 30 ml of 5% solution of glucose. She has available bottles containing 5 ml of 7% solution and bottles containing 10 ml of 1% solution. How many 5 ml bottles and 10 ml bottles will she need to make the solution? Bottles of 5 ml of 7% solution needed: ...

*March 11, 2013*

**Math**

A rectangular plot, 21m by 14m, is to be turned into a rectangular flower bed with a grass border around its outside edge. The grass border is to be 2m wide. What is the area of the flower bed? What is the area of the grass border?

*March 10, 2013*

**Science- chemistry**

fuzzy silver coating is impure silver. it can be converted back into silver nitrate by reacting it with nitric acid what has been done to the reaction mixture to recover solid silver nitrate?

*March 7, 2013*

**chemistry**

copper compounds such as copper (II) sulfate are toxic. before disposal, these compounds must be treated to reduce their toxicity. describe how to use steel wool to remove the Cu 2+ ions from an aqueous solution of copper (II) sulfate

*March 7, 2013*

**math**

Find three consecutive intergers whose product is 33 larger than the cube of the smallest integer.

*March 6, 2013*

**algebra one**

3(x+6) > 4(x-2) x is the number your looking for since it says greater than you need to place an inequalities sign above is how it should look just solve to get x by itself good luck

*March 5, 2013*

**algebra one**

-3(x+7) < -11 sounds like an inequality like what's depicted above again replace the number with a variable such as x and think about how the operations are correlated with the words now just solve to get x by itself, remember when you divide by a negative the sign will...

*March 5, 2013*

**Grammar**

You should try combining sentences that correspond or have similar subjects. Take the first two sentences could be combined since the second sentence describes what those model trains were like. The third and fourth sentences could also be combined since you could say although...

*March 5, 2013*

**Algebra 2**

Objective Function: C = 6x – 4y

*March 5, 2013*

**Physics**

A 3.0 kg block slides down a 4.5 m ramp of angle 30 degrees and collides inelastically with a 4.5 kg bolck at rest. Calculate the velocity after the collision.

*March 3, 2013*

**Math(Data Management)**

of the 11 girls in class: 6 dislike Trevor(T), 5 Dislike Bryce(B), 8 Dislike Drake(D), 3 Dislike T and B, 5 Dislike T and D, 4 Dislike B and D only Sue-Ellen is friends with all 3, place students in Venn Diagram and Find the Number and Describe?

*February 27, 2013*

**english**

We can touch different objects and feel things!! Or we can fix things n clocks can't, i don't know

*February 26, 2013*

**english**

What is a personification expression for hands on a clock?

*February 26, 2013*

**Physics**

High-speed stroboscopic photographs show that the head of a 197 g golf club is traveling at 36.8 m/s just before it strikes a 45.9 g golf ball at rest on a tee. After the collision, the club head travels (in the same direction) at 25.9 m/s. Find the speed of the golf ball ...

*February 26, 2013*

**physics**

A soccer ball with a mass of 415 g bounces off the crossbar of a goal and is deflected upward at an angle of 57° with respect to horizontal. Immediately after the deflection, the kinetic energy of the ball is 47 J. What are the vertical and horizontal components of the ...

*February 25, 2013*

**Physics**

Betty weighs 427 N and she is sitting on a playground swing seat that hangs 0.22 m above the ground. Tom pulls the swing back and releases it when the seat is 0.88 m above the ground. The acceleration of gravity is 9.8 m/s2. Betty is moving 3.5967 m/s when the swing passes ...

*February 20, 2013*

**Tuck Everlasting/Natalie Babbit**

is this right Toad-Freedom metamorphosis life growing and changing Wheel-Life flows round and round life and death endless rotating wheel life keeps going on and on Music box-Happiness and peacefulness tree symbol of life

*February 17, 2013*

**Tuck Everlasting/Natalie Babbit**

WHat are the symbols in this book. Tree Wheel Water Toad

*February 17, 2013*

**TUck everlasting/Natalie babbit**

WHat are the symbols in Tuck Everlasting?

*February 17, 2013*

**math**

Simplify using Pascal's Triangle: state a term number of formula and a value. What term number (Tn,r)is your answer? find the sum of row 12? I know that the sum is 2^12=4096, how would you find the term number?

*February 14, 2013*

**Math**

nate owes michael 5.00 nate expressed how much he owes as an integer Michael expressed how much nate owes him as an integer what do the two integers have in common

*February 8, 2013*

**Biology**

You are studying a large population of claims of which 396 are pink (t) and 557 are Tan (T). Tan clams are completely dominant over pink clams. Calculate the following: 1. The frequencies of each allele. 2. The expected genotypic frequencies. 3. The number of heterozygous ...

*February 7, 2013*

**Physical science**

How much energy would be needed to warm 1.5 L of water from 0 °C to 25 °C? The specific heat capacity of water is 4186 J/kg/°C.

*February 5, 2013*

**physical science**

How much energy would be needed to warm 1.5 L of water from 25 °C to 50 °C? The specific heat capacity of water is 4186 J/kg/°C.

*February 5, 2013*

**physics**

A rifle is aimed horizontally at a target 46.0away. The bullet hits the target 2.30 below the aim point. What is the bullet's flight time? What is the velocity as it leaves the barrel?

*February 1, 2013*

**algebra 1a**

12 + y -------- 36 + w

*January 31, 2013*

**Physics**

A crate of mass 59 kg is attached to one end of a string, and the other end of the string runs over a pulley and is held by a person as in the figure below. If the person pulls with a force of 94 N, what is the crate's acceleration?

*January 30, 2013*

**Math Homework**

In a clinical trial, a drug used to relieve pain caused side effects in 2% of the patients who took it. For a new trial, three patients were selected at random. Find the probability that all three of the patients had side effects

*January 30, 2013*

**Math**

Account numbers for Northern Oil Company consist of seven digits. If the first digit cannot be a 0 or 1, how many account numbers are possible?

*January 29, 2013*

**6 grade Math**

3 divided by 0.5 which is 6

*January 23, 2013*

**3rd grade math**

4

*January 23, 2013*

**math**

Alice is giving a book as a gift that is 8 3/8 inches long and 6 1/2 inches wide. Will the book fit in a box that is 8 1/2 inches long and 6 1/2 wid or in a box that is 8 inches long and 6 inches wide?

*January 14, 2013*

**physics **

sphere A has a mass of 4.2*10^-2 kg and is tethered to a wall by a thin thread. Sphere a has an excess of 1.2 *10^12 electrons. Sphere B has a deficit of 3.5*10^12 electrons and is o.23 m from sphere A a) determine the angle between the thread and the wall b) determine the ...

*January 13, 2013*

**math**

a farmer plant seeds in a field that is 125 meters length and 75 meters width. The seed must receive 1 liter per square meter every day and how many liters must farmer apply to the field every day?

*January 10, 2013*

**Math**

13/100

*January 8, 2013*

**geometry**

The Polygon Angle-Sum Theorem states the following: The sum of the measures of the angles of an n-gon is ____. (1 point) (n – 1)180o (n – 2)180o 9. What is the measure of one angle in a regular 16-gon? (1 point) 2,520o 202.5o 157.5o 78.75o 10. The measure of each ...

*December 31, 2012*

**calculus**

can someone please help me find all the zeros of the following polynomial. write the polynomial in factored form. f(x)=x^3-3x^2+16x-48 can you please show all work

*December 24, 2012*

**calculus**

how do I test the different regions??

*December 24, 2012*

**calculus**

solve the following inequality. write your solution in interval notation. x^3+9x^2-108 less than or equal to 0 please show all work

*December 24, 2012*

**Math**

A street is 282 m long is covered with snow. City workers are using a snowplow to clear the street. A tire on the snowplow has to turn 47 times in traveling the length of the street. What is the diameter of the tire?

*December 21, 2012*

**physics**

The coefficients of static and kinetic friction between a 50 kg box and a horizontal surface are 0.64 and 0.17, respectively. (a) What is the acceleration of the object if a 335 N horizontal force is applied to the box? m/s2 (b) What is the acceleration if the applied force is...

*December 18, 2012*