# Posts by dani

Total # Posts: 368

**Physics**

A car is stationary at a stop sign when it is hit directly from behind by a truck of mass 3000kg which was travelling at a speed of 9 m/s immediately before the collision. The two vehicles lock together and move forward with an initial speed of 6 m/s. a) what is the mass of ...

**Physics**

A car is stationary at a stop sign when it is hit directly from behind by a truck of mass 3000kg which was travelling at a speed of 9 m/s immediately before the collision. The two vehicles lock together and move forward with an initial speed of 6 m/s. a) what is the mass of ...

**Math**

Thanks Steve!

**Technology**

YAY!!! 100% WOOHOO

**al 1**

How do you solve this.....x/3+ x/2=3/4

**physics**

If R is the range for an angle of projectin 0f 15¤ wd the horizntl ' then the 0thr angle of projection for which the range is R 'is

**AP Chem ---**

Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new iron sample? Please show the calculating so I can learn to do it.

**AP Chem ---**

Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Please show the calculating so I can learn to do it.

**AP Chem ---**

If a radioactive nucleus alpha decays to yield a sodium24 nucleus in 14.8 hours, what was the identity of the original nucleus? Nuclear equation?

**Chemistry**

AP Chem ---- Which type of radiation is emitted when chromium 51 decays into manganese 51? Show the nuclear equation that explains it.

**Chemistry**

AP Chem --- PbS + O2 = PbO + SO2 Balance the equation and write a short paragraph explaining the electron transfers that happen.

**Chemistry**

AP Chem - Which element is oxidized in the following reaction: CuO(s) + H2 (g) Cu(s) + H2O (l)

**Chemistry**

Which salt would result from the acid-base reaction of phosphoric acid and potassium hydroxide? I already know I will have to write and equation and it with make water (H2O) and a salt. I think it starts like this... H3Po4 + KOH = K2HPO4 + H2O But I'm not sure what to do ...

**chemistry**

the accepted density of helium at stp is 0.18 g/L. during an expirement, 0.10g of helium with a volume of 0.54L at stp was collected. what is the percent error in this expirement? (accepted-expiremental)/accepted X 100

**Calculus**

Let f(x)=(lnx)^4 f'(x)=4(ln(x))^3/x what is f'(e^2)=?

**Math**

For what values of a and b is the line 3x+y=b tangent to the curve y=ax^3 when x=–3?

**English skills with reading**

How do I know if a paragraph lacks transitional words? Or if the paragraph contains a fragment and a run-on?

**Chemisty**

Slaked lime (Ca(OH)2) is formed from quicklime (CaO) by the addition of water: CaO(s) + H2O(ℓ) → Ca(OH)2(s). What mass of slaked lime can be produced from a mixture of 29.8 g of CaO and 10.3 g of H2O? Answer in units of g.

**Chemisty**

For the reaction 3 Mg + N2 → Mg3N2 , what is the maximum amount of Mg3N2 which could be formed from 6.66 mol of Mg and 9.34 mol of N2? Answer in units of mol.

**chemistry**

A CHM 111 student recorded the mass of a piece of dry lead metal as 23.7412 g. He obtained a graduated cylinder and recorded an initial water volume of 25.0 mL; upon addition of the metal, the water level rose to 27.1 mL. Calculate the density of lead in units of g/mL. (Watch ...

**health**

OHHHHH YEEAAAHHH!!!!!!!!!! 100%! TRUST HER!!!!!!! BTW CAPITAL LETTERS MAKE EVERYTHING BETTER :-)

**calculus**

Previously asked: the length of a rectangular prism is increasing at a rate of 8 cm/s, its width is increasing at a rate of 3 cm/s, and its height is increasing at a rate of 5 cm/s. when the length is 20 cm, width is 10 cm, and height is 15 cm, how fast is the volume of the ...

**calculus**

the length of a rectangular prism is increasing at a rate of 8 cm/s, its width is increasing at a rate of 3 cm/s, and its height is increasing at a rate of 5 cm/s. when the length is 20 cm, width is 10 cm, and height is 15 cm, how fast is the volume of the rectangular prism ...

**Math (IB Calc)**

A ferris wheel has a diameter of 50 meters. If point A is at the lowest point of the ferris wheel, 0 meters. What is the height of point A if the wheel moves 2pi/3 radians clockwise? What is the equation?

**Physics**

two forces one of 12n and another of 2n act on a body in such a way that they make an angle of 90 with each other.find the resultant of the two forces.

**Physics**

calculate the component of a force of 200n at a direction of 60 to the force.

**physics**

state which of the following are vectors and which are scalars distance, mass time, weight, volume ,density ,speed verbosity acceleration ,force,temperature and energy.

**science**

anyone

**science**

1. The process in which the chromosomes in sex cells are reproduced by half is called _____________. 2. A white mouse is crossed with a black mouse. all of the offspring were grey. The genes for fur color in mice show _________. 3. Genes are specific sections of __________. 13...

**science**

1) a pea plant with yellow seeds is crossed with a pea plant with green seeds. all of the offsprings have yellow seeds. the allele for yellow sees is a. Dominate because all offspring have yellow seeds. b. Recessive because all of the offsprings have yellow seeds. c. dominant ...

**algerbra**

Graph the inequality 3x + y ¡Ü 5 on a separate piece of paper. List in the answer box:

**Science help!!!!**

Thanks Diana

**Math**

How many minutes would it take Rachel to jog 3 miles if she jogs 1/15 mile every minute?

**Math**

Can you help answer thx

**Math**

John has 1/4 yard of fabric. He cuts it into 3 equal pieces . What fraction of a yard is each piece of fabric? Choices are A. 1/12 yard B, 1/8 yard C. 1/2 yard D. 3/4 yard please help answer

**history**

1) in what context was the crtc and its CanCom regulations established? Describe the rationale for thw creation of the crtc. I don't understand what it means by 'in what context' and how the two parts are different from one another and how to answer them differently.

**H.E.L.P**

Thanks Josslyn and Exactly:)! They're both correct. 100%!

**Science Plzz Help**

Allison is correct. 100%. My answer for number 2 though was knee and elbow. Finger and elbow was not one of my choices. Still B. though. Hope this helps! :-)

**Science help ASAP**

Thanks guys. These answers are all correct! Thanks Anonymous and Melissa! :-)

**physics**

A car is stationary at a stop sign when it is hit directly from behind by a truck of mass 3000kg which was travelling at a speed of 9 m/s immediately before the collision. The two vehicles lock together and move forward with an initial speed of 6 m/s. a) what is the mass of ...

**Science**

*Me beforehand* These answers better be right. *Me after* YAAAAAAAAAAAAYYYYYYYY!!!!!!!!!!!!!!!!!!! I GOT THEM ALL RIGHT!!!!!!!!!!! *Breaks out in happy dance* ^_^

**science(check answers)**

I GOT 100% A D B C

**Math**

The formula for the velocity of an object is , where v is the velocity of the object, d is the distance traveled, and t is the time elapsed while that distance is traveled. v=d/t distance = speed times time so time in seconds = distance in meters / speed in meters/second we ...

**Physics**

An inclined plane is used to raise a 100 kg box to a height of 5 m. How long must the inclined plane be if a force of 250 N is used to push the box up the inclined plane?

**physics**

In one dimension ,how does energy depend on size of region if an electron is confined there ??

**physics**

A violin string vibrates at 298 Hz when unfingered. At what frequency will it vibrate if it is fingered one sixth of the way down from the end?

**physics**

An object with mass 2.0kg is attached to a spring with spring stiffness constant 240N/m and is executing simple harmonic motion. When the object is 2.2Ã—10âˆ’2m from its equilibrium position, it is moving with a speed of 0.65m/s . Calculate the ...

**physical**

Libby pulls a 3.9kg box to the right with a force of 200 n at a 45 degree angle relative to the horizontal along a frictionless surface. What is the acceleration of the box?

**humanties**

None of the above are true

**algebra**

What did the baby buzzard say when it say an orage in the nest

**Geometry**

Why don't you just follow the formula? V= pi r^2 h

**Maths**

The question is vague - I think it should have been, "How many more roses did A than B at first?" In this case, it's 14.

**6 grade math**

It is only adding 1 whole number to the fraction that make looks like improper fraction; say 1 1/4 = 5/4; adding 4/4 to 1/4. 4/4 is the fraction of 1 taken from the whole number 8 5/12 = 7 17/12 (added 12/12 to 5/12) 4 5/9 = 3 14/9 (added 9/9 to 5/9) 2 1/3 = 1 4/3 (added 3/3 ...

**science**

I think the first one is B. But I'm not for sure on that one. But the second one is output.

**Chemistry**

Although the VSEPR theory is correct in predicting that CH4 is tetrahedral, NH3 is trigonal pyramidal, and H2O is bent, the HNH angle in NH3 is only 107.3° and the HOH angle in H2O is only 104.5°. Explain these deviations from the expected tetrahedral angle of 109.5&...

**science**

Newton’s law of universal gravitation is rep- resented by F=GMm r2 Here F is the gravitational force, M and m are masses, and r is a length. Force has the SI units kg · m/s2. What are the SI units of the proportionality constant G? 1. m2/(kg2 · s2) 2. m/(kg...

**physics**

A plastic tube allows a flow of 14 cm3/s of water through it. How long will it take to fill a 240 cm3 bottle with water? Answer in units of s

**algebra**

Let U = {1, 2, 3, 4, 5, 6, 7}, A = {1, 2, 3, 4}, B = {1, 2, 5, 6}, and C = {3, 5, 7}. List all the members of the given set. (Enter your answers as a comma-separated list.)

**english**

revise the following sentences to eliminate shifts in tense, mood, voice or person. 7. The flight attendant said, "please turn off all electronic devices," but that we could use them again after takeoff. 8. The real estate market was was softer than it has been for a...

**math**

Oscar picked 12 apples. He gave 1/3 of the apples to Gil and 1/3 of the apples to Becky. How many apples did each of them?

**Science due tmrw**

Which simple machine does not change the direction of a force?

**Clueless in calculus**

Let f be the function be defined by f(x)=5^((2x^2)-1)^(1/2) A) is f an even or odd function? Justify answer. B) find the domain of f. C) find the range of f. D) find f'(x)

**Math Pre Cal**

Find the values of the trigonometric functions of è from the information given. cot è = 1/2 , sin è < 0

**physics**

How fast is a city on the earth's equator (such as Singapore) moving due to our planet's daily spin on its axis?

**Physics**

A test car travels in a straight line along the axis. The graph in the figure shows the car's position as a function of time

**Math**

if 3/5 of a group of children were girls, and there were 24 girls, how many children were in the group?

**Algebra 1**

Solve this proportion- 4/x+3=8/10

**Algebra 1**

Thank you, thank you, thank you, thank you!!!! I appreciate it very much! I worked on this for no lie, 30 minutes or so and could never get an answer that was one of the choices! Thank you soooooo much!

**Algebra 1**

A car travels on a highway at an average speed of 65 miles per hour. What was the speed in feet per second? (Remember- 1 mile=5280 feet)

**physics**

Solution of:An air plane ABC R=250m (x=30) the speed of the meachine is 450Km/h in A determine the accelartion supported by the pilot in A and the tangential accelartion is 10m.s determine the speed in B if the tangential accelaration is constant

**statistics**

1. 2.5

**7th grade Social Studies Ms. Sue**

@Delilah @ just a friend ;-) @Victoria Y'alls are correcto! 100% 4 points! Thanks a lot peeps! For others of you, here's the answers: 1. Arid. (D) 2. Hurricanes. (C) 3. Wind and water. (B) 4. Overheat in places. (C)

**Math (Algebra 1)**

Thank you for the explanation. I thought you maybe did everything on top and then divided the bottom number, but that didn't seem right. Thanks a lot though!! You were great help! :)

**Math (Algebra 1)**

I thought that was the answer, but I wasn't sure if I should do the division first because of order of operations?

**Math (Algebra 1)**

2y-z --------- for x=-3, y=13, z=5 x

**math**

thank you so much

**math**

The price of an oven changes from $450 to $396. (1 point)13.6% increase 13.6% decrease 12% increase 12% decrease

**7th grade social studies Ms.Sue please**

I agree with Mo. Thanks

**physics**

A car of mass m = 1635 kg is pushed off a cliff of height h = 23 m. If the car lands a distance of 9 m from the base of the cliff, what was the kinetic energy of the car the instant after it left the cliff?

**Geometry**

@Steve The blue and yellow are part of the same earring.

**psychology**

multidirectional

**Physics**

Calculate the velocity of a satellite moving in a stable circular orbit about the Earth at a height of 2600 km.

**math**

a 15 ft ladder is palced against a wall such that its base is 9 ft away from the wall. if the base of the ladder is moved to 6 ft away from the wall, by about how much will the top of the ladder move up the wall?

**science**

what would be the complementary strand of DNA be for the following sequence of bases? C T T A G G C T T A C C A I'm stuck please help! my guess was ATTGCCATTGCCA

**algerbra**

Donna deposits into an account that pays simple interest at a rate of 5% per year. How much interest will she be paid in the first 6 years?

**Physics**

Find the force of tension in the chain. Determine the force of compression in the support bar. Be sure to include a free body diagram as part of your solution. Now the only information given is a mass=20.4 kg and the angle 22 degrees. If anyone could help me with this question...

**Physics- grade 12**

A ramp leading up to a loading platform is 3 m long and 1 m high at its highest point. If the friction is ignored, what work is needed to slide a 600-kg crate up the ramp at a constant speed? a) 2.00 *10^2 J b) 5.89 *10^2 J c) 1.80 *10^3 J d) 5.88 *10^3 J I believe the answer ...

**Physics**

In this problem they show a diagram of a pulley system with an inclined plane (25 degree incline). There is a box called m1=47kg resting on the incline plane and m1=35kg hanging on the vertical line. The question reads: The coefficient of friction between m1 and the surfvace ...

**Physics - grade12**

for some reason by multiplying the answer that I got for the "mass added" by 35kg, this gave me the answer at the back of the book

**Chemistry - Mole Ratio**

How many moles of oxygen are produced from the decomposition of 3.4g of hydrogen peroxide? How many molecules of O2 are produced?

**math**

thanks

**math**

is this not always true? because the square of 0.5 is 0.25 and that is less than the number, but the square of 3 is 9 which is greater than 3.

**math**

please help! is the square of a number greater than the number?

**math**

thanks so much ! have a blessed day/night

**math**

Those are the answer choices

**math**

A) r +.20 B) r + .15 C).15r D) 3R + .15

**math**

or each month jack works he earns an increase or raise of $. 05 on his hourly pay if he has already worked for three months, which shows his 4th month's hourly rate in terms of his first month's hourly rate?

**Algebra**

A weekly order is 10 gallons of coke to 15 gallons of 7up. What is the ratio of 7up to coke?

**Algebra**

A road map uses a scale of 3 cm for every 5 miles. How many miles are there in 9.5 cm?

**Chemistry**

What is the volume of a scuba tank if it takes 2000 L of air collected at 1.00 atm to fill the tank to a pressure of 150 atm? T is constant.