Saturday

April 25, 2015

April 25, 2015

Total # Posts: 526

**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 L = 81.0 m. In part (a) the person is looking at the base of the antenna, and his line of sight makes an angle of &...
*September 4, 2013*

**Biomechanics**

What will be the vertical velocity at take off for a high jumper in order for them to clear a height of 2m?
*July 31, 2013*

**math find the max/min**

f(x) = x2 + 2x - 9
*July 21, 2013*

**math**

What is the solution of the equation |2-x | =3
*June 3, 2013*

**Pre-calculus**

As you drive down a mountain, you see a sign that says there is a 6 degree grade over the next 5 miles. What is the change in elevation over that 5 mile stretch?
*May 22, 2013*

**math URGENT thx**

what is the rule? x 5 7 9 11 y 1 1.6 1.8 2.2
*May 22, 2013*

**math**

what is the rule? x 5 7 9 11 y 1 1.6 1.8 2.2
*May 21, 2013*

**Math**

The AC voltage coming out of a standard wall plug in the United States can be expressed as the function V(t) = 120sin(120*pi*t), where t represents time (in seconds) and V is the voltage. We will let t be greater than or equal to 0 for simplicity. A. Make an accurate sketch of...
*May 6, 2013*

**Precalculus with Trigonometry**

Calculate the work done by gravity as a 10 kg object is moved from point A = (0,0,0) to point B = (1,2,0). We are given s = (x sub f - x sub I)x(hat) + (y sub f - y sub I)y(hat) + (z sub f - z sub I)z(hat). Sorry if that doesn't make sense. I think I have to plug in the ...
*April 22, 2013*

**Math**

If a Ferris wheel has a 64 m radius and the center ot the wheel is 84 m above the ground, what is the height of a carriage above the ground starting from 0 degrees to 360 degrees?
*April 21, 2013*

**orchestra programs????????**

New York Jazz Workshop if you're willing to commute to NY. They have fabulous programs for teens under a great teacher/performer.
*April 20, 2013*

**math**

thx so much!!!
*April 14, 2013*

**math**

Triangle ADE is inside rectangle ABCD. Point E is half way between points B and C on the rectangle. Since AB is 8 cm and side AD is 7 cm. 1. what is the area of triangle ADE? 2. what is the ratio of the area of the triangle ABE to the area of triangle ADE? 3. What is the ratio...
*April 14, 2013*

**math**

thank u
*April 11, 2013*

**math**

Raymond is planting a border of 48 seedlings that will completely surround a rectangular garden. He wants to plant the seedlings 2 feet apart. If the garden plot is 30 feet long, how wide should it be?
*April 11, 2013*

**Precalc with Trig**

There isn't a typo this is the equation my professor gave us, thanks for the help!
*April 11, 2013*

**Precalc with Trig**

What value(s) of x from 0 to 2pi solve the following equation: cos squared x - cos x - 6 = 0
*April 11, 2013*

**Precalc with Trig**

No, I don't just my professor trying to trick us, thanks for the help!
*April 7, 2013*

**Precalc with Trig**

What value(s) of theta (0 less than or equal to theta less than or equal to 2pi) solve the following equation: cos squared theta - cos theta - 6 = 0
*April 7, 2013*

**Precalculus with Trig**

Rewrite the following expression as an algebraic expression in x: cos(arcsin(x))
*April 7, 2013*

**Precalculus with Trigonometry**

Graph f(x) = sin(3x)/sin(x) - cos(3x)/cos(x) and make a conjecture. Prove your conjecture.
*April 7, 2013*

**Precalculus with Trigonometry**

Prove or disprove the following identity: cos (x+pi/6) +sin (x-pi/3) = 0
*April 7, 2013*

**math**

A model of a park was built on scale of 1.5cm to 50m. If the distance between two trees in the park is 150m, what is the distance on the model?
*April 6, 2013*

**Precalculus with Trigonometry**

Prove or disprove the following Identities: cos(-x) - sin(-x) = cos(x) + sin (x) sin raised to the 4 (theta) - cos raised to the 4 (theta) = sin squared (theta) - cos squared (theta) cos (x+(pi)/(6)) + sin (x - (pi)/(3)) = 0 cos(x+y)cos(x-y) = cos squared (x) - sin squared (y...
*April 4, 2013*

**Precalculus with Trigonometry**

Draw and solve any triangles satisfying alpha = 20 degrees b = 10 c = 16
*April 4, 2013*

**Precalculus with Trigonometry**

What values of theta between 0 and 2pi solve the following equation? sin squared (2theta)-sin(2theta)-2=0 NOTE: if you choose to plot this, a good WINDOW is (0,2pi) x (-3,3).
*April 4, 2013*

**Precalculus with Trigonometry**

Prove or disprove the following identity: (sin(10x))/(sin(x)+sin(9x)) = (cos(5x))/(cos4x))
*April 4, 2013*

**Life orientation**

In 10 to 15 lines critically discuss 5 ways in which human or environmental problem impact on the community.Provide relevant sources to support
*March 28, 2013*

**Life orientation**

community organizations that are involved in supporting HIV
*March 28, 2013*

**Life orientation**

Community organizations that are involved in supporting HIV
*March 28, 2013*

**Life orientation**

In 10-15 lines,critically discuss 5 ways in which human or environmental problem impacts on the community.Provide relevant sources to support your claims.
*March 28, 2013*

**Math**

Which sentence will give the best estimate
*March 25, 2013*

**Physics**

A transformer has 25 turns in the primary coil and 200 turns in the secondary coil. If 12 V is connected to the primary coil and a 20-Ω device is connected to the secondary coil, calculate the current in Amperes passing through the device.
*March 17, 2013*

**Physics**

The primary of a step-down transformer connected to a 240 V source has 1000 turns. The secondary has 100 turns. What is the output voltage of this transformer?
*March 17, 2013*

**government**

During its early history, the British Parliament _____.
*February 28, 2013*

**satistics **

assume the probability that an electronic device will have a type 1 defect is 1% and the probability that it will have a type 2 defect is 2%. given that these two defects are not independent ,what is the probability that an item randomly selected has both a type 1 and type 2 ...
*February 27, 2013*

**math**

A rope is used to hold a tree upright. it is attached to the ground at a distance of 95 feet from the tree and forms an angle of 47 degree with the ground. How long is the rope to the nearest foot?
*February 12, 2013*

**Math**

Jen-Min wants to enlarge a 4 inch by 6 inch photo so that the longer side will be forteen inch how long will the shorter side be?
*January 18, 2013*

**math**

if part a of a square is one fourth and part c is one tenth then what is part b?
*January 15, 2013*

**Math**

A ship is traveling due north. Every 30 mins,the captain corrects his course by a certain number of degrees.Here are the corrections made during the first four hours of the voyage: 5,-7,3,2,-6,8,-4,-6 ps theres degrees in the numbers Note:in marine Navigation the course is the...
*January 14, 2013*

**Social Studies**

What did railroads contribute to the development of the west? Pls Help! Soical studies is my worst subject ever! Thanks if you can help!
*December 9, 2012*

**possesive nouns**

The sister of Miguel woke him up
*December 6, 2012*

**3rd grade math**

Jeff rodé his bike around a bike trail that was 1/3 of a mile long.He rode around the trail 9 times.Write a fraction greater than 1 for the distance.How many miles did Jeff ride?
*December 6, 2012*

**Chemistry**

69.3 additional BaCl2
*November 30, 2012*

**Chemistry**

A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the specific heat (capacity...
*November 16, 2012*

**Chemistry**

A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the specific heat (capacity...
*November 16, 2012*

**Chemistry**

A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the specific heat (capacity...
*November 16, 2012*

**Chemistry**

A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the specific heat (capacity...
*November 16, 2012*

**Physics**

Compute the final temperature.
*November 12, 2012*

**Physics**

A Jaguar XK8 convertible has an eight-cylinder engine. At the beginning of its compression stroke, one of the cylinders contains 499 cm ^ 3 of air at atmospheric pressure (1.01\times 10^5 Pa}) and a temperature of 27.0 degrees C. At the end of the stroke, the air has been ...
*November 12, 2012*

**Physics or Math**

Yay thanks, thought it was simple thank you.
*November 9, 2012*

**Physics or Math**

I thought maybe I mixed up the order, and that I should have done (3,0,0) - (-1.3,2.4,0), point minus "effective origin" (the rotation axis) which makes more sense, this changes it to 12.67k, is that correct?
*November 9, 2012*

**Physics or Math**

A force F = 0.8 i + 2.5 j N is applied at the point x = 3.0 m, y = 0 m. Find the torque about the point x = -1.3 m, y = 2.4 m. Hmm, (this is essentially just a vector problem) I know you're supposed to find the position vector r and take the cross product of r x F, the ...
*November 9, 2012*

**math**

3 sail boats to 6 fan boats
*November 6, 2012*

**Math**

The panels for the Pulsar 32-inch TV are manufactured in three locations and then shipped to the main plant for final assembly. Plants A, B, and C supply 50%, 30%, and 20%, respectively of the panels.The quality-control department of the company has determined that 1% of the ...
*November 5, 2012*

**Physics**

An Earth satellite moves in a circular orbit at a speed of 5800 m/s. a)What is the radius of the satellite's orbit? b) What is the period of the satellites orbit in hours?
*October 23, 2012*

**physics**

A mass of 2.6 kg lies on a frictionless table, pulled by another mass of 4.7 kg under the influence of Earth’s gravity. The acceleration of gravity is 9.8 m/s2 .If the acceleration of the object has a magni- tude of 3.5 m/s2, what is the angle θ between the two ...
*October 12, 2012*

**early child care**

D.
*October 11, 2012*

**Physics**

You will fire the spring gun 3 times from the first detent and measure the change in height of the (pendulum + ball) for each shot. Write the equation for the change in height of the first shot.
*October 11, 2012*

**algebra**

M --- +. 5= -2 3.
*October 6, 2012*

**Early childhood education**

For this assignment, you are asked to design a Plan-Do-Review activity. Be sure to describe in detail each stage of the process (student involvement in the planning, what students would actually do, and what specific questions you would ask during the review stage of the ...
*October 3, 2012*

**Stats**

A large population has a mean of 200 and a standard deviation of 40. Which one of the following best describes the percentage of measurements that fall in an interval that is within two standard deviations of the mean?
*September 14, 2012*

**Physics**

The function ax(t) describes the acceleration of a particle moving along the x-axis. At time t=0, the particle is located at the position x0 and the velocity of the particle is zero. ax(t)=a0e−bt The numerical values of all parameters are listed below: x0=980 m a0=500 ...
*September 1, 2012*

**Physiology**

Why does a solution of Haemolysed red blood cells look clear instead of cloudy?
*July 30, 2012*

**Chem**

Can a 100ml sample of 3.0m H2 SO4 could be neutralized by 100 ml of 3.0m NH3
*July 16, 2012*

**College Physics**

A person who is properly constrained by an over-the shoulder seat belt has a good chance of surviving a car collision if the deceleration does not exceed about 30 "g"s (1.0 g= 9.8m/s^2) Assumind uniform deceleration of this calue calculate the distance over which the...
*July 2, 2012*

**Physics PLEASE HELP!**

How many molecules are there in 0.029 moles of carbon dioxide gas, CO2? I asked this today, and the person told me to do 0.029 * 6.022e23 and my answer was wrong :/ Can someone please tell me what my answer should be!!?
*June 20, 2012*

**Physics**

How many molecules are there in 0.029 moles of carbon dioxide gas, CO2?
*June 20, 2012*

**phsical science**

a tire contains air ata pressure of 2.8 bar at 10 degree celsius.if the tires volume is unchanged what will the air pressure in it be when the tire warms up to 35 degree celsius if the car is driven.
*June 20, 2012*

**Chemistry**

If 45.5 mL of He at 25.0°C and 101.3 kPa were heated to 75.0°C, what would be the volume?
*May 28, 2012*

**Math**

Write the equation of a line in slope intercept form that is parallel to the line y= 1/3x+ 5 and passes through (-9, 5). Do not use any spaces. Slope should be a reduced improper fraction.
*May 25, 2012*

**Accounting**

T/F Questions The main reason that the bank statement cash balance and the company's cash balance do not initially balance is due to timing differences. Sales Discounts is a revenue account with a credit balance. Multiple Choice: Assuming a 360-day year, proceeds of $48,...
*April 28, 2012*

**Algebra**

Bayside Insurance offers two health plans. Plan A pays $90 + 40%. Plan B pays $140 + 35%. Giselle would savfe with plan B if she had more than ---in bills.
*April 27, 2012*

**Life Orientation**

Identify and describe one environmental problem that causes crises,ill health,and disasters in South Africa?
*April 19, 2012*

**Reading**

What is the scene illustration-reflective plot
*April 11, 2012*

**life orientation**

The growth in the environment is growing and people pollute the area by burning their rubbish and even their cars exhaust pipes that pollutes the air.Many people doesn't care about the environment but rather kills it than looking after it!
*March 30, 2012*

**Financial Accounting**

Is Depreciation expense recorded in the General Journal?
*March 19, 2012*

**Math**

8 = 6 + p/2 *The p/2 is not dividing it's p over 2 like in a fraction.
*February 21, 2012*

**chemistry homework help!!**

CaH2 + 2H2O = Ca(OH)2 + 2H2 H2: P:.97 atm T: 296K V: 10L PV=nRT n=PV/RT n= (.97*10)/(0.08206*296) n= .40mol .4 mol H2 (1molCaH2/2mol H2)(1mol/42g) = 8.4 g CaH2
*February 16, 2012*

**science**

Name the type of reaction that the equation represents? 2Cu + O2 -------> 2CuO
*February 11, 2012*

**math**

208 times 2
*February 4, 2012*

**science**

if the distance between crest were 1.5 meters apart, and 2 crest pass the pole each second, what would be the speed of the wave ?
*February 1, 2012*

**Science**

Which distance is the greatest ? A. The distance across the Milky Way Galaxy. B. The distance to the nearest star Cluster. C. The distance across the solar system. D. The distance to the nearest Galaxy.
*January 30, 2012*

**algebra**

for the algebraic function described by the expression x^2+2x-6 and written as the function f(6) = x^2+2x-6, what is the evaluation of f(6)?
*January 30, 2012*

**8 Grade Math**

At the same time that a flagpole casts a 4.5 m shadow , a meter stick casts a 1.5 m shadow. How tall is the flagpole ?
*January 25, 2012*

**Pre-Calculus**

Verify: 1/(1-sintheta) * 1/(1+sintheta) = sec^2theta sec^2theta is the answer, it would be great if someone can do the steps for me. thank you.
*January 23, 2012*

**math**

The tail on Alex 's dog is 5 1/4inches long.This lenght is between which two inch-marks on a ruler?
*January 3, 2012*

**Chemistry**

1) A compound has the following percentages by mass: barium, 58.84%; sulfur, 13.74%; oxygen, 27.43%. Determine the empirical formula of the compound. 2) If a 1.271-g sample of aluminum metal is heated on a chlorine gas atmosphere, the mass of aluminum chloride produced is 6....
*December 30, 2011*

**Physics**

Vf2=(m1+m2)(Vo1)/m1 m1=truck; m2=car; Vo1=initial speed of truck. mo1Vo1=mf1Vf1+mf2Vf2; substitute Vf2 to find Vf1
*November 19, 2011*

**Chemistry**

How many grams of NH3 can be produced from 3.26 moles of N2? How many grams of H2 are needed to produce 13.99 g of NH3?
*November 6, 2011*

**Chemistry**

Use a grammatically correct English sentence to describe how the mass in amu of one molecule of a compound is related to the mass in grams of one mole of that compound.
*November 1, 2011*

**Physics**

A girl throws a stone form the top of a building with an initial velocity of 20.0 m/s upward. The building is 50.0 m high and the stone just misses the edge of the roof on its way down. Draw a v vs t graph, find time needed for stone to reach max height, find max height, time ...
*October 1, 2011*

**Physics**

A person pushes on a 62-kg refrigerator with a horizontal force of -256 N; the minus sign indicates that the force points in the −x direction. The coefficient of static friction is 0.61. (a) If the refrigerator does not move, what are the magnitude and direction of the ...
*September 27, 2011*

**pre-calculus**

Could someone please help me with this problem? square root of (2x+1) -5 = 8 I think I take the 5 and add it to the 8 and then I have square root of (2x+1) = 13 then do I square both sides and end up with 2x+1 = 13^2 2x+1=169 2x+1-1=169-1 2x=168 x=84 am I even close on this?
*September 20, 2011*

**Physics**

The elevator has not moved yet, so the normal force and the force of the man's weight are equal. The answer is 431.2 N n - mg = ma n - mg = 0, so n = mg n = 44.0*9.8 n = 431.2
*September 9, 2011*

**algebra**

so yhu just find a common denominator???
*September 7, 2011*

**algebra**

5. If x=8 and y=3, find the value of 4/x - 1/y. well i would substitute 8 for x and 3 for y. then it would be 4/8 - 1/3. 0.5 - 0.33333 would it then be 0.2333? 8. If x=6 and y=5, find the value of x/8 + 2/y. well i would substitute 6 for x and 5 for y. then it would be 6/8 + 2...
*September 7, 2011*

**Physics**

As two trains move along a track, their conductors suddenly notice that they are headed toward each other. The figure below gives their velocities v as functions of time t as the conductors slow the trains. The slowing processes begin when the trains are 240 m apart. What is ...
*September 7, 2011*

**Physics**

actually should I do 2.3 m/s divided by 343 seconds to get .00599 m/s^2?
*September 5, 2011*

**Physics**

From t = 0 to t = 5.00 min, a man stands still, and from t = 5.00 min to t = 10.0 min, he walks briskly in a straight line at a constant speed of 2.3 m/s. (a) What is his average velocity vavg in the interval 2.000 min to 7.90 min? I found this to be 1.15 m/s (b) What is his ...
*September 5, 2011*