# Posts by autumn

Total # Posts: 202

**Math/Physics**

Brace yourself for some potentially potent facepalming, because I haven't quite gotten the hang of it so I'm gonna let you helpful Jiskhans in on my dimwittedness! Starting with 1/2 m v^2 - 1/2 m 25 = m g 100sin20, you bring the -1/2 m 25 over to the other side, giving...

**Math/Physics**

How would you solve this? 1/2 mv^2 - 1/2 m x 25 = mg x 100sin20 I obtained this from the question: A girl on a sledge starts, with a speed of 5 m/s, at the top of a slope of length 100 m which is at an angle of 20 degrees to the horizontal. The sledge slides directly down the ...

**Math/Physics**

A car of mass 0.9 tonnes is driven 200 m up a slope inclined at 5° to the horizontal. There is a resistance force of 100 N. (i) Find the work done by the car against gravity. (ii) Find the work done against the resistance force. (iii) If the car slows down from 12 m s? 1 ...

**Math - Vectors**

Oh wait, just realized how dumb that was! Had a brain fart, thanks for clearing things up!

**Math - Vectors**

Wait, but doesn't the question say 'values'?

**Math - Vectors**

Relative to an origin O, the position vectors of points A and B are given by OA = 3pi + 4j + p^2k, and OB = -pi + -1j + p^2k Find the values of p for which angle AOB is 90° So here's my work so far: If angle = 90° then OA.OB = 0 OA.OB = p^4 - 3p^2 - 4 p^4 - 3p^2 - ...

**Math & a bit of Physics**

A block of mass 11 kg is at rest on a rough plane inclined at 30° to the horizontal. A force acts on the block in a direction up the plane parallel to a line of greatest slope. When the magnitude of the force is 2X N the block is on the point of sliding down the plane, and...

**Chemistry**

This helped a lot, thanks for the easy to understand explanations ^_^

**Chemistry**

Sulfur dioxide reacts with oxygen to form sulfur trioxide according to the equation 2SO2(g) + O2(g) <-> 2SO3(g) Samples of sulfur dioxide, oxygen, and sulfur trioxide were added to a flask of volume 1.40 dm^3 and allowed to reach equilibrium at a given temperature. The ...

**Chemistry**

When one mole of ammonia is heated to a given temperature, 50% of the compound dissociates and the following equilibrium is establised. NH3(g) <-> 1/2N2(g) + 3/2H2(g) (note: <-> is my sad attempt at the equilibrium symbol) What is the total number of moles of gas ...

**Math**

If x - y = 9, find the maximum value of xy^2 Never seen this type of question before, any help? Thanks!

**Math**

How would you differentiate this equation? 1/6(2x-3)^3 -4x Here's my working u = 2x-3 y = 1/6u^3 dy/du = 1/2u^2 du/dx = 2 dy/dx = dy/du x du/dx = (2x-3)^2 -4 Is this correct? Thanks for checking!

**8th grade math**

Convert 3.16x10^3 in standard form

**Chemistry**

Back again with another problem :) How do you calculate the enthalpy change, in kJ/mol for the reaction of copper(II) sulfate? 0.0210 mol of copper sulfate was added to 25 cm3 of water. The temperature increased by 14°C. The specific heat capacity of water is 4.18 J k-1 g-...

**Chemistry**

Back with another question similar to the one I asked before, but this one's a bit more confusing 4NH3 (g) + 5O2(g) ? 4NO(g) + 6H2O(g) ?H= –909 kJ/mol 2NO(g) + O2(g) ? 2NO2(g) ?H= –115 kJ/mol 3NO2(g) + H2O(l) ? 2HNO3(aq) + NO(g) ?H = –117 kJ mol?1 Which is ...

**Math**

A number is divisible by 3 if the sum of its digits is divisible by three. For example, 375 is divisible by three because 3+7+5 is 15, which is divisible by 3. 1+0 = 1, which isn't divisible by 3 1+9+9 = 19, same as above

**Chemistry**

So the answer is A, right? Thanks for the help!

**Chemistry**

Use the information below to answer this question C(s) + O2(g) -> CO2(g) ?H = -394 kJ/mol H2(g) + 1/2 O2(g) -> H2O(l) ?H = -286 kJ/mol 4C(s) + 5H2(g) -> C4H10 (g) ?H = -126 kJ/mol The standard enthalpy of combustion of butane, in kJ/mol, is: A -2880 B -2590 C -806 D -...

**Math**

Solve the equation 2cos2x = ?3 for 0°?x?360° I did this: cos2x = ?3 /2 2x=30 x=15 x=15, 165, 195, 345 Is this correct? Solve the equation ?3 sin2x + cos2x = 0 for -??x?? No idea how to approach this one Thanks a bunch for the help!

**Math**

Yep

**Physics**

Drawing a triangle to show the forces would help make this question a lot easier Let x be the upward component sin(44.8)=x/146.8 x = 146.8 x sin(44.8)

**Math**

6sin(2x)+3=0 How do you find the smallest value of x in the interval 0?x?? for which y=0? My work so far: 6sin(2x)=-3 sin(2x)=-1/2 The answer should be 7?/12, or 1.83 Thanks in advance!

**maths**

Nadhini's age —> x Mary's age —> 3x 3x+10 + x+10 = 80 4x = 60 x = 15

**Chemistry**

Thanks! Just want you to know that all your help on the site is really appreciated!

**Chemistry**

How would you write an ionic equation for: NH2SO3H + NaOH —> NaNH2SO3 + H2O? Is it simply H+ + OH- —> H2O?

**MATH!!!!**

Is 107 X 10^4 A Scientific Notation

**Math**

A moving company charges $0.60 per pound for a move from New York to Florida. A family estimates that their belongings weigh about 6 tons. About how much would it cost the family to move from New York to Florida?

**Math**

Anais bought 4.5 yards of ribbon. She had 3 feet 8 inches of ribbon left after trimming some curtains. How many inches of ribbon did Anais use to trim the curtains?

**Math**

Sean has $75 to spend on CDs. If each CD costs $6.98, about how many CDs can he buy?

**History**

Many people believe that the Civil War is considered to be the worst war in American history. What is the basis for this belief and do you agree or disagree with this statement?

**History**

What were the details of the Great Compromise?

**Anatomy**

What is Oxytocin? Is this positive or negative feedback?

**Anatomy**

What does the term "homeostasis" mean? What is one of the mechanisms used by our bodies to maintain homeostasis?

**Algebra**

An ice cream shop has 19 flavors. You also have the choice of a sugar cone, waffle cone or cup. If a person orders two scoops of different flavor ice cream, how many possible orders are there, if you do not care about the order of flavors? I don't understand how to factor ...

**check my work**

It’s d, losers club is correct

**Science**

Which of the following tools can bd used to measure mass? A) a graduated cylinder B) a triple beam balance C) a mercury thermometer D) a bathroom scale I think its B, thank you for the help!

**E.L.A**

Three centuries of tension between the plebs and patricians led to the __________.

**Geometry**

1. One angle of a rhombus measures 60 degrees. If the perimeter ois 20 inches, find the length of both diagonals. 2. An equilateral triangle has an altitude of 18 inches. Find the are and perimeter of the triangle

**Math**

How do you write 200 7/100 as a decimal?!?

**math**

Tony deposited $3000 into a savings account that pays him interest at a rate of 3%. How much interest will Tony earn in 5 years?

**Social studies**

Thanks so much Bri 100%

**Pre-Algibra**

Find the radius of a cone with a height of 14 cm and a volume of 718.4 〖cm〗^3, use 3.14 for X and remember to show all work

**French**

oui J'ai mangé des pâtes delicieuses J'ai mangé de delicieuses pâtes your sentences are correct.

**French**

ceux-ci sont suffisamment it would be applicable but putting it the way it is supposed to be is better not to be rude but just saying

**Chemistry**

When its brakes are applied, a car moving at 10 m/s undergoes an acceleration of -1.2 m/s2. How far does the car travel before it comes to a stop?

**Pre algebra**

A photograph is reduced by a scale factor of . If the original length of the photograph was 20 inches, what is the length of the reduced photo

**French**

" Il a les choses de l' homme et son fils " ? yes that's correct

**Language Arts**

It is spring.

**Physics**

While playing lawn darts with his friend, Jack notices that when he throws a dart up at 60 degrees it travels 11 meters. How high did the dart travel

**6TH GRADE MATH**

-2-19+7= 24 19+7=26-2=24

**math**

ms. sue ?

**math**

the first stick is 3/4 ft long.kaya found five more sticks as shown . STICK A 9/10 FT LONG STICK B 5/3 FT LONG STICK C 1/3 FT LONG STICK D 3/8 FT LONG STICK E 6/8 FT LONG LIST ALL THE STICKS THAT KAYA'S SISTER MIGHT BE ABLE TO USE .

**math**

how can you tell whether kaya's sister will or will not be able to use the the longer stick without knowing the lenghth of the first stick?

**math**

kaya brings her sister a stick to hold up a bird feeder. her sister says that she needs a stick that is 5/8 times as long as the stick kaya brought to her. kaya finds a stick that is longer than her first stick.

**math**

read again

**math**

ms. sue ?

**math**

thomas had 1/3 of a pizza to share with one of hi friends . how much of the pizza did each person get ?

**math**

Wayne filled 5 glasses with 2/3 liter of soda in each glass. How much soda did Wayne use?

**math**

Ms sue?

**math**

Grandpa has twenty - four coins in his pocket . grandpa gives Sam some clues the total value of the coins in his pocket one - sixth of coins are quarters , one - half of coins in dimes . what is the total value of the coins in grandpa 's pocket that Sam should discover? ...

**math**

Thank you

**math**

Is it ms sue?

**math**

7 1/2

**math**

Ms .sue ?

**math**

Kevin uses 1 1/4 cups of milk to make 1 cake . what is the total amount of milk Kevin needs to make 6 of these cakes ?

**Math.**

for connexus kids its C

**math**

Ms . sue

**math**

Answer 800

**math**

Jayden had some items to store in a storage unit that was 10 feet long , 8 feet wide , and 10 feet high. What is the volume of the storage unit ?

**math**

I did understand her

**math**

So 21/32 is my answer

**math**

So I should have simplify 21/32

**math**

And answer?

**math**

I'm sorry next time I will do that

**math**

Then I got 4 and 2/8 and final answer 4 and 1/4 I'm right ?

**math**

OK Ms.sue first I did 3/4 times 7/8 that equal 42/8

**math**

Brenden read 3/4 of a book that was 7/8 inch thick . how much of the book , in inches , did he read ?

**math**

I am not available

**math**

Ms. Sue

**math**

I'm right?

**math**

1/5 is my answer.

**math**

Ms .sue are u available?

**math**

Of 25 students who took a test in math , only 5 received A's .what fraction of the class received an A on the test? Write your answer in simplest form.

**math**

My answer 18

**math**

18

**math**

1/5 times 90

**math**

If student A sold 1/5 as many as student B who sold 90 , how many pizzas did student A sell ?

**math**

500 divided by 25

**math**

I guessed u know divided 25 by 500

**math**

Twenty -five students in a class were selling pizzas door to door in a community of 500.if the town was divided evenly among the students , how many did each student visit?

**math**

Five people share these four candy bars . what fraction does each share?

**math**

Mani, James, and isidro equally shared 1/2 of a pie. Which fraction of the whole pie did each of them receive ?

**math**

A recipe for 1batch of muffins included 2/3 cup of raisins.Ina made 2 and 1/2 batches of muffins.how many cups of raisins did she use

**Algebra**

Simplify. Write the answer using positive exponents only. (x^-5y^-6/a^-5)^-3

**math**

2y-3(-2y-4y+5)

**math**

A recipe for 1 batch of muffins included 2/3 cup of raisins . INA made 2 and 1/2 batches of muffins . how many cups of raisins did she use?

**math**

There was a sidewalk sale at Mega Mall. Everything was marked down by30%. Rodrick bought 3 pairs of jeans originally priced at $29.95 each,a shirt originally priced at $18.50 and a pair of sandals originally priced at $32.29. The sales tax in Roderick's state is 7.25%. How...

**Math**

The altitude of a plane as it begins to descend is shown by the linear equation a = 22,000 – 800m, where a is the plane’s altitude, in feet, and m is minutes. What is the plane’s altitude when m = 12? ft

**Algebra help**

For a it is 3tons for b it is yes because it is more than 3tons and if it was classifed as a 4 truck that means that's the trucks classification

**Math**

Losers club is correct expect 4.) $7.50 more