# dani

Newest questions posted by dani-
## science

If you had a sample containing 55 alpha particles, how many protons would be present in that sample? -
## Physics

A rocket launched from earth with a rest mass of 150,000Kg moves at 2.8x10^8 m/s during a voyage that takes 1.3 years, according to a clock on board the rocket. a) Using relativity, calculate how long the voyage would take, from earth's reference frame. b) -
## Algebra problem

Multiply (x-5/4x+8)*(12x^2+32x+16) A. (3x+2)/4(x-5) B. (x-5)(3x+2)/4 C. (x-5)(3x+3) D. (x-5)(12x+8) Please help me solve this problem because all I get is 3x^2-13x-10 (which isn't a choice.) -
## Algebra again

Simplify 5x^3/7x^3+x^4 Is the answer 5/7+x where x is not equal to 0,-7? -
## Algebra

Simplify x/6x-x^2 I know that the answer is 1/6-x but the answers look like this: A. 1/6-x where x is not equal to 0,6 B. 1/6-x where x is not equal to 6 Please help me with understand why is says x is not equal to, I have like 5 problems just like this so -
## Algebra 1

The width (w) of a rectangular pool is x+4. The area (A) of the pool is 2x^3 - 29x + 12. What is an expression for the length of the pool? A. 2x^2 + 8x + 3 B. 2x^2 - 8x - 3 C. 2x^2 - 8x + 3 D. 2x^2 + 8x - 3 I'm not sure please help me with this problem! -
## Spanish

How are stem changing ir verbs different from stem changing ar and er verbs in the present subjunctive? -
## psychology

Please check my answers for these questions, thank you. 1. A case study is A. a study of the legal ramifications of psychological research B. an intensive study of a person or group* C. observation with minimal interference D. a study of a group of people -
## Pri 5 maths

Mrs lao bought 5 blouses and 6 skirts for $108. Three skirts cost as much as 2 blouses. How much did she pay for the 6 skirts? -
## Math

Find the length of the right triangle's other leg. Round to the nearest tenth. SHOW YOUR WORK. LEG=9ft HYPOTENUSE=12ft -
## Maths

Minah and rohana had a total of $338 at first. After minah’s mother gave her another $49 and rohana spent half of her money, they both had the same amount of money. How much did Minah have at first? -
## Maths

Mr lee is 56 years old. His nephew, sam, is 4 years old. In how maby yearsâ€™ time will mr lee be 5 times as old as his nephew -
## physics

A long time after the switch is closed, what is the current in the circuit? A long time after the switch is closed, what is the current in the circuit? - unanswered Check your answer Save your answer You have used 0 of 3 submissions #11B (3 points -
## physics

Consider classical electron orbit with radius 53pm (picometers) that has a magnetic moment equal to 2μB (the Bohr magneton). What is the current of that orbiting electron in A? -
## Spanish

In Chile celebrations often revolve around: A) an asado B) a pebre C) a manteo D) a lúcuma I know that an asado is a type of food, pebre is sauce, manteo is a type of clothes, and lúcuma is a fruit. But I'm not sure what the answer here is. I know you -
## physics

A small 0.18 kg metal ball is tied to a very light (essentially massless) string that is 0.8 m long. The string is attached to the ceiling so as to form a pendulum. The pendulum is set into motion by releasing it from rest at an angle of 40 ∘ with the -
## algebra 1

70 less than 3x + 10 less than 100 -
## Science

2. what is a factor that limits a technological design? -
## Math

The ratio of the number of men to the number of women in a club is 3:7.There are 12 more women than men.How many members are there altogether? -
## Chemistry

Use the data in the table to calculate the equilibrium constant for the following reaction. HCOOH(aq)+ OH −(aq) equilibrium reaction arrow HCOO−(aq)+ H2O(l) HCOO is 5.9e-11 (Kb) HCOOH is 1.7e-4 (Ka) Not sure how to find the equilibrium constant given -
## Math

Hi! I quickly just need to know what is an irrational number? Thanks! ~Dani -
## English

Which type of context clue can be used to determine the meaning of the capitalized word? As the winning team rushed onto the court to celebrate their last-second victory, the losing team headed to the locker room in DEJECTION. Comparison Example -
## Math

I have 3 1-6 cubes looking for different ways to roll the sum of 12, How many ways will it be? -
## Alegrebra 2

What is an equation of a parabola with the giveb focus Focus:(-2,0) -
## Government

The president is the author of the nation's public policies in his or her role of A commander in chief B chief legislator C chief of party D chief citizen -
## Algebra 2

What is the sum of the arithmetic series 5 (sigma sign) n-1 (3n-2)? -
## math

How far from the wall must you place a ladder of length 12m. if the ladder is to touch a point 10m above the ground? -
## Math-Check my answer

Solve the inequality. Explain all steps and identify the properties used. 3a-4 less than or equal to 5 My answer: First, you add 4 to both sides: 3a - 4 + 4 -
## Mathematics

Hi! I don't understand this Math problem and I was wondering if I could have some help? It would be greatly appreciated! Thanks! C = 5/9(F - 32) The equation above gives the Celsius temperature, C, corresponding to the Fahrenheit temperature, F. Find the -
## Government

How do party whips influence legislation?? Please help!! -
## chemistry

Calculate the work done (in joules) when 5.0 mole of water is frozen at 0°C and 1.0 atm. The volumes of five moles of water and ice at 0°C are 0.0900 L and 0.0980 L, respectively. -
## chemistry

Calculate the heat of decomposition for this process at constant pressure and 25°C. (Look up the standard enthalpy of formation of the reactant and products in the table; ΔH°f(BaCO3(s)) = -1218.8 kJ/mol, ΔH°f (BaO(s)) = -558.2 kJ/mol and ΔH°f -
## chemistry

Calculate the heats of combustion for the following reactions from the standard enthalpies of formation listed in Appendix 2. (ΔH°f (HgO(s)) = -90.7 kJ/mol and ΔH°f (FeO(s)) = -272 kJ/mol.) (a) 2 Fe(s) + O2(g) 2 FeO(s) kJ (b) 2 CH3OH(l) + 3 O2(g) 2 -
## chemistry

Ethanol (C2H5OH) and gasoline (assumed to be all octane, C8H18) are both used as automobile fuel. If gasoline is selling for $1.45/gal, what would the price of ethanol have to be in order to provide the same amount of heat per dollar? The density and -
## Language Arts

Hi. I need to check my answers and I would hate to get them wrong because of one little mistake. Thanks! 1. An argumentative essay should present a clear thesis statement, provide strong evidence to support the thesis, and _____. a. Address -
## English

In 'first confession' Gran is described as a ? A. Flat character < B. Round character C. Stock character D. Antagonist < I think it's either A or D... not sure which one -
## chemistry

A 45-kg person drinks 390. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 17% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake? [Hint: The work done in -
## chemistry

A 77.40 kg piece of copper metal is heated from 19.6°C to 337.3°C. Calculate the heat absorbed (in kJ) by the metal. -
## chemistry

A sheet of gold weighing 11.4 g and at a temperature of 15.6°C is placed flat on a sheet of iron weighing 24.2 g and at a temperature of 54.9°C. What is the final temperature of the combined metals? Assume that no heat is lost to the surroundings. - -
## chemistry

A 0.1219-g sample of solid magnesium is burned in a bomb calorimeter that has a heat capacity of 1769 J/°C. The calorimeter contains exactly 271 g of water, and the temperature increases by 1.126°C. Calculate the heat given off by the burning Mg, in kJ/g -
## L.A.-Check Answer

According to "Life Without Gravity" why can astronauts' muscles become weak? a. Without gravity, the blood is rerouted from the legs to the head. b. Without gravity, the body "grows" as much as several inches. c. Without gravity, eating is difficult, so -
## English L.A.

Which of the following best describes an expository essay? a. An essay that uses casual, conversational language. b. An essay that tells a story about a real-life experience. c. An essay that explains an idea by breaking it down. d. An essay that uses -
## L.A.

What is the part of the story in which the conflict eases? -
## Math

1/2 divided by 1/2=1? -
## Math

The city highway department bought 3/4 tons of salt to put on the road when it snows. They have used 2/7 of salt. How many tons has the city highway department used? -
## Math

What is... -1/2+1/3=_____ -1 1/5+-(-6 1/2)=_____ 5/8-(-2/8)=_____ -9/10-2/5=_____ 6 3/5-(2 1/5)=_____ -
## chemistry

One isotope of a nonmetallic element has mass number 16 and 7 neutrons in the nucleus. The anion derived from the isotope has 10 electrons. Write the symbol for this anion. I thought the answer was O^2- but this isnt correct -
## chemistry

The diameter of a neutral neon atom is about 1.4 ✕ 10^2 pm. Suppose that we could line up neon atoms side by side in contact with one another. Approximately how many neon atoms would it take to make the distance from end to end 1 cm? I did 1.4 x 10^2 pm -
## Math

Quick question: What is 9 squared written in standard form? It should be 81 correct? -
## S.S.

1. For centuries, Arab Muslims had generally welcomed Christian pilgrims to the Holy Land. Which group later took control of the Holy Land, attacked pilgrims, and led Pope Urban to call for the crusades? a. Mongols b. Byzantines c. Seljuk Turks** d. North -
## Math, Calc

Use implicit differentiation to find an equation of the tangent line to the curve at the given point x^2+2xy+4y^2=12. Point (2,1). (Eclipse) -
## math

How do I write 0.8% as a fraction in lowest terms? I thought I put .8 over 10 and then multiplied by 10/10 to get rid of the decimal. So then I would have 80/100 and then reduce from there which would be 4/5, but my teacher says the answer is 1/125. Thank -
## chemistry

The compete oxidation of 2g of an aldehyde A by acidified potassium chromate produces 2.1g of carboxylic acid B which is dissolved in 50 ml of distilled water . The obtained solution reacts with exactly 1.05 g of solid lime to form salt C a) Write the -
## physics

An isolated capacitor of unknown capacitance has been charged to a potential difference of 100 V. When the charged capacitor is then connected in parallel to an un- charged 10.0 μF capacitor, the potential difference across the combination is 30.0 V. -
## physics

A diffraction grating having 180 lines/mm is illuminated with a light signal containing two wavelengths, λ1 = 400 nm and λ2 = 500 nm. The signal is incident perpendicularly on the grating. What is the smallest angle at which two of the resulting maxima -
## physics

A metal rod is forced to move with constant velocity along two parallel metal rails, connected with a strip of metal at one end. A magnetic field of magnitude B = 0:350 T points out of the page. a) If the rails are separated by L = 25.0 cm and the speed of -
## physics

A wire has a resistance of R. What will the wire's resistance be if it is stretched to four times its original length without changing the volume of the wire? (Express in terms of R.) R=V/I; 4R=V/I; R=V/(I/4) I think this is right? help please. -
## physics

When 115 V is applied across a wire that is 10 m long, the magnitude of the current density is 1.4*10^4 A/m2. Find the resistivity of the wire. R=V/I; R=pL/A => V/I=pL/A => A(x)V/I(x)L=p :(π(5^2))(115)/(1.4*10^4)(10) Is this right? Do I just plug and chug -
## physics

A convex spherical mirror has a radius of curvature of 50 cm. Determine the position and magni cation of the image of an object located 35 cm in front of the mirror. i only know how to do concave mirrors. i have the equations as 1/f=1/d0+1/di for position -
## Math10-3

A 2 by 6 is 1 1/2 in thick. how high would a stack of 2 by 6 boards be if the stack is 10 boards high? Express your answer in feet and inches -
## math

the temperature at 8 a.m. was 65 degrees. By 11 a.m. the temperature had increased 17 degrees. What was the temperature at 11 a.m. ? -
## math

Let f(x)=2x2−7x+5 and g(x)=x2+9. Find f⋅g, and f/g i don't understand how to do this. -
## physics

Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. Speaker B is 12 m to the right of speaker A. The frequency of the waves emitted by each speaker is 686 Hz. Sound velocity is 343 m/s. You are standing between -
## general physics

a person horizontally pushes a 25 kg couch. Applied force is 18N and average resistive force is 7N. its pushed from rest to a final speed of 2.3 what is the distance pushed the time taken and the power delivered to push couch -
## Physics

A boy swings a yo-yo around his head with a force of 50N what is the gravitational force of the yo-yos mass and distance is doubled -
## U.S Hisotry. Please check my answers.

Why is the United States often referred to as the melting pot? -Various cultures from many countries have "melted" together to create what America is and how American culture is defined today** -Most American citizens' native customs and traditions will -
## 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) -
## 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) -
## 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 -
## 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

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 -
## 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 -
## 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 -
## 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

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

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

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

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