# dani

Most popular questions and responses by dani-
## 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

*asked on October 21, 2014* -
## 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

*asked on October 28, 2016* -
## 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

*asked on October 12, 2016* -
## Algebra 2

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

*asked on December 1, 2016* -
## Physics

Two forces are applied to a car in an effort to move it, as shown in the following figure, where F1 = 402 N and F2 = 364 N. (Assume up and to the right as positive directions.)(F1 is 10degrees and F2 is 30degrees) (a) What is the resultant of these two

*asked on May 3, 2011* -
## 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

*asked on November 30, 2017* -
## english

What is a simile, idiom, or metaphor for relief?

*asked on February 3, 2009* -
## 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

*asked on October 6, 2016* -
## 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

*asked on November 1, 2016* -
## 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!

*asked on May 7, 2018* -
## 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

*asked on January 18, 2018* -
## Physics

An arrow is shot at a 30 degree angle with the horizontal. It has a velocity of 49m/s. The acceleration of gravity is 9.8 m/s2. How high will the arrow go?

*asked on September 22, 2011* -
## 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

*asked on April 12, 2017* -
## Algebra again

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

*asked on May 7, 2018* -
## Chemistry Help!!

a kilogram of aluminum metal and a kilogram of water are each warmed to 75 degree Celsius and placed in two identical insulated containers. one hour later, the two containers are opened and the temperature of each substance is measured. the aluminum has

*asked on January 19, 2011* -
## 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.

*asked on May 24, 2016* -
## 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

*asked on October 30, 2016* -
## L.A.

What is the part of the story in which the conflict eases?

*asked on October 5, 2016* -
## 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

*asked on October 27, 2016* -
## science

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

*asked on October 16, 2018* -
## 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.)

*asked on May 7, 2018* -
## Physics

An outfielder throws a 0.150 kg baseball at a speed of 26.0 m/s and an initial angle of 30.0°. What is the kinetic energy of the ball at the highest point of its motion?

*asked on May 3, 2011* -
## math

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

*asked on November 7, 2012* -
## 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

*asked on October 22, 2014* -
## 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

*asked on January 17, 2016* -
## Chemistry

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

*asked on May 22, 2015* -
## 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

*asked on November 20, 2015* -
## Physics

An electric motor rotating a workshop grinding wheel at a rate of 95 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.40 rad/s2. (a) How long does it take for the grinding wheel to stop? (b) Through how

*asked on May 3, 2011* -
## 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?

*asked on November 27, 2013* -
## 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?

*asked on May 22, 2015* -
## 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.

*asked on May 22, 2015* -
## Physics

A 7.80-g bullet moving at 530 m/s penetrates a tree trunk to a depth of 6.2 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the friction force is constant, determine how much time elapses

*asked on May 3, 2011* -
## Maths

OABCDE is a right triangular prism with OA = 2units , OD= 2units and AB = 4 units. The unit vectors i,j and k are parallel to OA,OD and OC respectively. a) Find the unit vector parallel to DB.

*asked on March 24, 2019* -
## Government

How do party whips influence legislation?? Please help!!

*asked on October 31, 2016* -
## Physics

A ski jumper starts from rest 51.0 m above the ground on a frictionless track and flies off the track at an angle of 45.0° above the horizontal and at a height of 12.0 m above the ground. Neglect air resistance. (a) What is her speed when she leaves the

*asked on May 3, 2011* -
## Math (Word Problems)

I need to know how to set up this problem: A salesman drives from Ajax to Barrington, a distance of 120 miles, at a steady speed. He then increases his speed by 10 mph to drive the 150 miles from Barrington to Collins. If the second leg of his trip took 6

*asked on November 30, 2008* -
## algebra

Use the formula 4.9t^2 +vot=s, where t is the time in seconds, vo is the initial velocity, and s is the distance in meters. Approximately how far will an object fall in 4 seonds, if it is thrown downward at an initial velocity of 20 meters per second (vo)

*asked on April 28, 2010* -
## 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.

*asked on May 22, 2015* -
## 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

*asked on November 24, 2017* -
## Physics

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

*asked on July 8, 2012* -
## 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

*asked on May 24, 2016* -
## 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

*asked on May 24, 2016* -
## 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

*asked on January 10, 2017* -
## 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?

*asked on October 3, 2016* -
## Physics

Two car drive along the same road towards each other one at 15m/s and the other 12 m/s. Each car horn sounds at 256 hz. Calculate the feqency of driver of each car?

*asked on December 11, 2018* -
## Chemistry

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

*asked on May 22, 2015* -
## Science

2. what is a factor that limits a technological design?

*asked on September 12, 2017* -
## Math

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

*asked on May 15, 2014* -
## 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

*asked on March 13, 2012* -
## math

i need some serious help with limits in pre-calc. here are a few questions that i really do not understand. 1. Evaluate: lim (3x^3-2x^2+5) x--> -1 2. Evaluate: lim [ln(4x+1) x-->2 3. Evaluate: lim[cos(pi x/3)] x-->2 4. Evaluate: lim x^2+x-6/x^2-9 x--> -3

*asked on July 13, 2010* -
## Math(geometry)

I need to know how to find the meausure of a triangle using vertical angles, and also how to measure a triangle using linear pairs... Oh, I hope I'm not too late with an answer for you... To measure a triangle using linear pairs, you have to use the

*asked on October 2, 2006* -
## 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

*asked on September 17, 2013* -
## algebra

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

*asked on October 6, 2013* -
## Physics

A 55.0 kg ice skater is moving at 4.04 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.795 m around the pole. (a) Determine the force exerted by the horizontal rope on her

*asked on May 3, 2011* -
## 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

*asked on May 24, 2016* -
## Chemistry

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

*asked on May 22, 2015* -
## calculus

give 3 examples of functions from everyday life that are described verbally.what can you say about the domain and range of each of your functions?

*asked on August 27, 2007* -
## 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

*asked on May 15, 2014* -
## calculus

You put some ice cubes in a glass, fill the glass with cold water, and then let the glass sit on the table. Describe how the temperature of the water changes as time passes. *as time passes the tempt. rises so the ice cube starts melting, right?

*asked on August 27, 2007* -
## 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.

*asked on October 30, 2016* -
## Physics

Two objects with masses of 1.00 kg and 7.00 kg are connected by a light string that passes over a frictionless pulley as in the figure below. (a) Determine the tension in the string. (b) Determine the acceleration of each object. (c) Determine the distance

*asked on May 3, 2011* -
## History

How did the Chernobyl disaster affect the U.S? Did it at all?

*asked on January 28, 2009* -
## 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

*asked on December 10, 2016* -
## 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?

*asked on May 16, 2013* -
## Chemistry

Apply the gas laws to determine how many grams of sodium azide (NaN3) are needed to fill the air bag of your vehicle to a volume of 79.0 L at 35.0 degrees celsius and 1.00 atm. The reaction occurring in the air bag can be repesented by the equation, 2NaN3

*asked on December 9, 2011* -
## Physics

A rifle with a weight of 30 N fires a 3.0 g bullet with a speed of 250 m/s. (a) Find the recoil speed of the rifle. (b) If a 675 N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle. I got .245 m/s for the first one

*asked on May 3, 2011* -
## 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

*asked on October 21, 2016* -
## Chemistry

You observe that when copper is added to a soltion containing gold ions, the copper dissolves and the gold precipitates. Similarly, almost every other metal will displace gold from solutions of gold salts. a) Do these observations mean that gold ion is a

*asked on October 20, 2011* -
## 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

*asked on May 7, 2018* -
## 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?

*asked on January 20, 2018* -
## 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?

*asked on February 15, 2012* -
## Physics

A 14,245N auto with a velocity of 6.0m/s crashes into a brick wall. If the car moves 64.0 cm before coming to a stop, what average force does the car exert on the wall?

*asked on January 13, 2011* -
## chem: gases, liquids, solids

How many kilojoules of heat is required to completely covert 60.0 grams of water at 32.0° C to steam at 100°C? For water: s = 4.179 J/g °C (delta)H fusion = 6.01 kJ/mol (delta)H vap = 40.7 kJ/mol

*asked on November 30, 2010* -
## 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

*asked on October 30, 2016* -
## 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?

*asked on January 28, 2014* -
## Physics

An arrow is shot at a 30 degree angle with the horizontal. It has a velocity of 49m/s. The acceleration of gravity is 9.8 m/s2. How high will the arrow go?

*asked on September 22, 2011* -
## 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

*asked on December 6, 2014* -
## 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.

*asked on February 4, 2015* -
## Physics

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

*asked on November 9, 2014* -
## Chemistry

a helium balloon is partially filled with 28.7 L of gas at 25.0 degress celcius and a pressure of 1 atm. if the balloon is released and it floats up intp the atmosphere to a heightwhere the pressure is 2.8 x 10^-3 atm and the temperature is -24.0 degrees

*asked on December 8, 2011* -
## Calc

The directional derivative of z = f(x,y) at (2,1) in the direction toward the point (1,3) is -2/sqrt(5), and the directional derivative in the direction toward the point (5,5) is 1. Compute dz/dx and dz/dy at (2,1). I have no idea how to solve this

*asked on February 27, 2011* -
## science

explain why a single5 500 kg block of granite weathers much more slowly than 100 chunks of granite weighing 5 kg each.

*asked on November 18, 2010* -
## Physics

Two projectiles are launched form ground elvel at the same angle above the horizontal, and both return to groudn level. Projectile A has a launch speed that is twice that of projectile B. What are the ratios of the maximum heights of the balls? What are

*asked on January 4, 2009* -
## 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

*asked on February 19, 2018* -
## 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?

*asked on November 25, 2016* -
## 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

*asked on November 1, 2016* -
## 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

*asked on September 19, 2016* -
## 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

*asked on April 21, 2015* -
## 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

*asked on January 25, 2015* -
## 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

*asked on December 7, 2014* -
## 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

*asked on February 22, 2013* -
## physics

a person carries a 58kg package of books up a flight of stairs the length along the stairs is 24 meters the vertical height of the stairs is 12 meters how much work is done in raising the package I know the answer is 6800 J but how to get????

*asked on January 6, 2010* -
## Science

I'm doing a project on human population growth and the ecosystems. Does anyone know of any good websites that explain how china is affecting its ecosystems and why is chinas population growing so fast (technologically)?

*asked on September 16, 2007* -
## 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

*asked on October 30, 2016* -
## 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.

*asked on March 2, 2016* -
## 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

*asked on January 14, 2016* -
## Chemistry

A hot-air balloon has a volume of 4.000 x 10^5 L at 30 degrees celsius and a pressure of 748 mmHg. If the average molar mass of air is 29.0 g/mol, what is the mass of air in the balloon?

*asked on December 9, 2011* -
## Chemistry

Potassium, K, is more reactive than sodium, Na. Calcium, Ca, is less reactive than sodium. The comparative reactivity of these metals is often noted as: K > Na > Ca. Explain the reactivity differences of K, Na, Ca.

*asked on October 31, 2011* -
## Physics

objects with masses of 285 kg and a 585 kg are separated by 0.420 m. (a) Find the net gravitational force exerted by these objects on a 62.0 kg object placed midway between them.

*asked on May 3, 2011* -
## Physics

A 14,245N auto with a velocity of 6.0m/s crashes into a brick wall. If the car moves 64.0 cm before coming to a stop, what average force does the car exert on the wall?

*asked on January 13, 2011*