# alyssa

Popular questions and responses by alyssa-
## physics

the muzzle velocity of a 50.0g shell leaving a 3.00kg rifle is 400 m/s what is the recoil velocity of the rifle

*asked on December 16, 2012* -
## Pre-Calc

I am really struggling with how to do these problems, I posted them a few minutes ago but the answers/work shown was incorrect. 1) a) Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos 12° cos

*asked on April 13, 2015* -
## History

Which best describes the beginning of the American Revolutionary War? A. Great Britain and France declared war, known as the French and Indian War. B. American colonists fought the British at the Battles of Lexington and Concord. C. Great Britain signed

*asked on April 9, 2019* -
## Pre-Calc

1) Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos 12° cos 18° − sin 12° sin 18° And Find its exact value. 2) Use an Addition or Subtraction Formula to write the expression as a

*asked on April 13, 2015* -
## Physics

A 20.0 kg block is being pushed forward on a flat surface with a force of magnitude 45.0 N against a frictional force of 13.0 N. how would I find the change in kinetic energy after the force has pushed the block 4 meters? how much work would it take to

*asked on July 27, 2020* -
## Spanish

I have to answer negatively. ¿Podemos ir a la playa o nadar en la piscina? I answered.. No, no podemos ir a la playa ni nadar en la piscina. But it says there is a word missing between podemos and ir. I tried.. No, no podemos no ir a la playa ni nadar en

*asked on March 16, 2017* -
## Algebra

) An inlet pipe can fill an empty tank in 5 hours by itself, and an outlet pipe can drain the same tank when full in 7 hours by itself. If the tank is two-thirds full when the valves for both pipes are opened, how many minutes will it take to fill the

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

Which most accurately describe humanist artistic innovations during the Renaissance? (Select all that apply.) Characters in medieval paintings were two-dimensional and unproportioned, while Renaissance paintings were lifelike and realistic. Nude paintings

*asked on March 22, 2019* -
## Math

To study the efficiency of its new price-scanning equipment, a local supermarket monitored the amount of time its customers had to wait in line. The frequency distribution in the following table summarizes the findings. Find the standard deviation of the

*asked on April 15, 2017* -
## Chemistry

net ionic equation to show that sulfurous acid, H2SO3, behaves as an acid in water. I got this answer but do not know if it is correct. H2SO3 + H2O --- H3O + SO I am Not sure if its is tri/mono/diprotic

*asked on April 30, 2017* -
## Chemistry

Two moles of a nonelectrolyte solute are dissolved in 1 kg of an unknown solvent. The solution freezes at 7.8 degrees Celsius below its normal freezing point. What is the molal freezing point constant of the unknown solvent? What is your prediction for the

*asked on May 17, 2010* -
## Algebra 1

Just checking my answers. What is the sum or difference? 1. 2x^4 - 8x^4 A. -6x^8 B. -6x^4*** C. -16x^4 D. -16x^8 What is the sum or difference 2. 10y^10 - 14y^10 A. -4y^20 B. -140y^20 C. -140y^10 D. -4y^10*** 3. Write the polynomial in standard form. Then

*asked on October 24, 2016* -
## Math

A company did a quality check on all the packs of trail mix it manufactured. Each pack of trail mix is targeted to weigh 9.25 oz. A pack must weigh within 0.23 oz of the target weight to be accepted. What is the range of rejected masses, x, for the

*asked on October 28, 2017* -
## Chemistry

Given that HSO4- is a stronger acid than HPO4^2-, what is the chemical reaction if solutions containing these ions are mixed together? (Hints: One of these must act as an acid and the other as a base. Use the Brønsted-Lowry definition) Please explain how

*asked on May 9, 2017* -
## Physics

An object travels with a constant acceleration for 10 s. The vectors in Figure 3-41 represent the final and initial velocities. carefully graph the x component of the velocity versus time and the y component of the acceleration versus time, in a Vx vs t

*asked on September 11, 2015* -
## Calculus

A) The point p(3,1) lies on the curve y= square root x-2. If Q is the point (x, square root x-2) use your calculator to find the slope of the decant line PQ for the following values of x 1) 2.5 2.) 2.9 3.) 2.99 4.) 2.999 5.) 3.5 6.) 3.1 7.) 3.01 8.) 3.001

*asked on September 6, 2019* -
## Math

How many 1 inch squares can be cut from an 18"x24" piece of contruction paper

*asked on October 27, 2015* -
## Physics

A circular conducting coil with radius 3.40 cm is placed in a uniform magnetic field of 1.090 T with the plane of the coil perpendicular to the magnetic field. The coil is rotated 180° about the axis in 0.222 s. (a) What is the average induced emf in the

*asked on February 17, 2013* -
## Nassau

The length of the smaller rectangle at the right is 1 inch less than twice its width. Both the dimensions of the larger rectangle are 2 inches longer than the smaller rectangle. The area of the shaded region is 86 square inches. What is the area of the

*asked on August 4, 2011* -
## 9th grade chemistry

Is the name for CuH2PO4 copper dihydrogen phosphate? I don't really understand the ones with the H2 in them... thanks

*asked on December 4, 2008* -
## College Physics Question

The position of a ball as a function of time is given by x=(5.3m/s)t + (−11m/s^2)t^2 What would be the acceleration of the ball, and the velocity from t=0 to t=1s ?

*asked on September 17, 2017* -
## Science

what geographical features create natural boundaries for water to flow toward one ocean or another?

*asked on September 21, 2016* -
## Physics

A black mamba snake has a length of 4.3 m and a top speed of 8.9 m/s! Suppose a mongoose and a black mamba find themselves nose to nose. In an effort to escape, the snake accelerates at 20 m/s2 from rest. (a) How much time does it take for the snake to

*asked on August 29, 2015* -
## Physics

Two resistors 10ohms and 5ohms are connected in parallel across a 15V battery. What is the potential difference across the 10ohms resistor. I do not need the answer just the formula and how to figure out the problem. Thanks.

*asked on August 3, 2014* -
## math

The markup on a restaurant mean is 250%. A meal costs $7.25 to produce. How much will the customer be charged, after markup and 5% GST are applied?

*asked on July 4, 2013* -
## Physics

Three point charges are on the x axis: −6 µC at −3 m, 7 µC at the origin, and −5 µC at 3 m. Find the force on the ﬁrst charge. The value of the Coulomb constant is 8.98755 × 10^9 N · m^2/C^2.

*asked on January 15, 2013* -
## Calc 3

Find the volume of the wedge-shaped region contained in the cylinder x^2 + y^2 = 1 and bounded above by the plane z = x and below by the xy-plane. The picture is a cylinder with a diagonal plane through it creating a wedge. Thanks! ;)

*asked on November 29, 2011* -
## calculus

Suppose that the sales at Borders bookstores went from 70 million dollars in 1989 to 415 million dollars in 1993. What is the continuous percent growth rate, per year, of sales?

*asked on January 17, 2011* -
## Physics

At t=0 a particle leaves the origin with a velocity of 5.0 m/s in the positive y direction, its acceleration is given by a=3i-2j m/s^2 At the instant the particle reaches its maximum y coordinate, how far is it from the origin? I'm not sure how to do a

*asked on October 17, 2015* -
## Physics

A jet takes off from SFO (San Francisco, CA) and flies to YUL (Montréal, Quebec). The distance between the airports is 4100 km. After a 0.81-h layover, the jet returns to San Francisco. The total time for the round-trip (including the layover) is 13.9 h.

*asked on August 29, 2015* -
## Chemistry

calculate the natural logarithm and reciprocal concentration at 0 seconds and NO2 concentration (M) of .8333 and at time 20 (seconds) and .4617 NO2 concentration (M)

*asked on July 22, 2013* -
## Math

a farmer wants to fence in part of her land so that her chickens will have thier own little area. if she only has 28 feet of fence, what is the area of the largest pen that she can build?

*asked on June 7, 2012* -
## statistics

A manufacturer of cell phones has decided that an assembly line will be considered to be operating satisfactorily if less than 0.02% of the phones produced per day are defective. To check the quality of a day's production, the company decides to randomly

*asked on February 22, 2012* -
## Writing

can you use wanton in a sentence?

*asked on October 5, 2009* -
## Chemistry

What is the formula for? Do you just take the charges so they can equal out to each oter? Silver (I)acetate silver (I) bromide

*asked on December 11, 2008* -
## calc

find an equation of the line tangent to the circle (x-1)^2+(y-1)^2=25 at the point (4,-3) Can please someone explain this to me and show all work very confused

*asked on May 8, 2017* -
## algebra

Combine like radical terms -7\sqrt(6-5 ) \sqrt(54)

*asked on May 4, 2017* -
## Algebra

Joe and Skyler can clean an entire building in 44 hours. Joe can clean the entire building by himself in 66 fewer hours than Skyler can. How long does it take Joe to clean the building by himself?

*asked on February 21, 2017* -
## Math

Which is the greater amount of money, 120% of 0.3% of $1000 or 120.3% of $1000?

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

A rectangle has a width of 5 meters and length of 14 meters. If a similar rectangle has a width of 15 meters, what's its perimeter, in meters?

*asked on May 10, 2016* -
## Physics

(a) Estimate the positive charge in you due to the protons in the molecules present in your body. (Assume that the human body is made entirely out of water.) (b) What is the net charge in your body?

*asked on January 29, 2016* -
## Physics

An object travels with a constant acceleration for 10 s. The vectors in Figure 3-41 represent the final and initial velocities. carefully graph the x component of the velocity versus time, the y component of the velocity versus time and the y component of

*asked on September 11, 2015* -
## math

Find the simple interest and the final value of the deposit that earns the given rate for the indicated length of time. Round your answers to the nearest cent. $8439 earning 8% for 1.4 years ?

*asked on August 5, 2015* -
## math

If you roll a pair of number cubes 50 times, what would be the experimental probability of P(odd and odd)

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

Analyze the flight of a projectile moving under the influence of gravity (mg) and linear, i.e., laminar- flow drag (fD = bv, with b > 0 constant). Neglect \Phase I"; assume the projectile is launched from the origin at speed v1 and angle 1 above the

*asked on March 2, 2015* -
## Math

!!PLEASE SHOW YOUR WORK!! My recipe makes 96 cookies, but I'll only need 24 for the party, what will I multiply each ingredient by to make just 24 cookies? Explain.

*asked on January 21, 2015* -
## AP Calculus

In the answer space below, provide the larger of the two positive integers that add up to 60 and have the largest possible product.

*asked on October 16, 2014* -
## Science

why is burning magnesium an irreversible reaction?

*asked on October 3, 2014* -
## Government

Homework Help Powers that are shared by both the National Government and the States are called... A) reserved powers B) enumerated powers C) inherent powers D) implied powers E) concurrent powers The Supreme Court carries out most of the country's

*asked on June 26, 2013* -
## Algebra

LCD of x/x2+3x , 2x/x2-3x

*asked on January 27, 2013* -
## physics

The planetMars requires 2.35 years to orbit the sun, which has a mass of 2 × 1030 kg, in an almost circular trajectory. Find the radius of the orbit of Mars as it circles the sun. The gravitational constant is 6.672 × 10−11 N · m2/kg2 . Answer in

*asked on November 8, 2012* -
## physics

A wagon is pulled by a handle making an upward angle of 25° with a force of 25 N. What is the horizontal force pulling the wagon foward? What is the force lifting the wagon off the road?

*asked on November 3, 2012* -
## 7th grade math

solve for k -4k-8k+7=-53 Please explain how you found your answer!! Please help!!

*asked on August 8, 2012* -
## 5TH grade math

estimate each sum or differnce. 7.4 + 3.1+ 9.8 How do I do this?

*asked on August 25, 2011* -
## MATH GRADE 10****

Scott, Arif, and Diane run a small delivery company. For thier business, they use licensed two-way radios with a 20 km range. Scott is at their office which they have marked as the origin on their map of the town. Arif is dropping off a package at (-8, 16)

*asked on December 25, 2009* -
## grammar

as the title of a song, which is correct; "I've Learned From You" "I've Learned from you" "I've Learned From you" "I've Leared from You"

*asked on September 28, 2009* -
## Science

Grasshoppers generally have the colour as their background. What would be the problem with using the mark/release/recapture method to estimate the size of a population of grasshoppers if you marked them with bright red mark.

*asked on September 28, 2009* -
## math

A two-digit locker combination is made up of non-zero digits and no digit is repeated in any combination. Event A = the first digit is 4 Event B = the second digit is odd If a combination is chosen at random with each possible locker combination being

*asked on April 19, 2020* -
## Math

If Maria earned $60 in interest over a 4-year period at a 4% simple annual interest rate, how much did she originally deposit in savings?

*asked on March 25, 2020* -
## Chemistry

Chlorous acid reacts with ammonium chromate. How do I balance this?

*asked on January 7, 2020* -
## History

Which accurately describes Isaac Newton’s clockwork universe theory? A. It compares the universe to a mechanical clock wound up by God, with its gears governed by the laws of physics. B. It compares the universe to London’s Big Ben clock tower,

*asked on April 8, 2019* -
## Math

lucky drew an isosceles triangle as shown if the measures of XYZ is 25 what is the measure of XYZ

*asked on February 14, 2017* -
## Language arts

What is the name of the online textbook used in this course A) Language arts B) The big question C) Literature D) Write to learn

*asked on January 25, 2017* -
## Government and politics

Explain 2 enumerated powers of the president and 2 enumerated powers of congress

*asked on November 3, 2016* -
## chemistry

A student conducts a reaction and measures a 19.9 g yield. The theoretical yield of the reaction under the conditions used is 31.4 grams. What percent yield did the student achieve?

*asked on November 2, 2016* -
## math

the number of trucks crossing the border fell from 3240 to 2673. What is the percent decrease?

*asked on November 2, 2016* -
## Physics

Estimate the increase in rest energy of a copper sample [100 kg, c = 387 J/(kg · °C)] if its temperature is increased 100°C. -answer needs to be in kg please.

*asked on May 13, 2016* -
## Math

On the ruler below, identify the location of 7 3 -- 8

*asked on March 8, 2016* -
## Physics

A 500 g sample of gold heated to 971.0 deg. C is placed in a calorimeter containing 220 g of water initially at 20.0 deg. C. If no heat is lost to the surrounding environment what will the final temperature of the water be? [HINT: At the end, the sample

*asked on February 16, 2016* -
## Physics

A cylinderical brass rod with a radius of 2.10 cm and length of 1.50 m is placed in a fire with temperature of 490 deg. C. If the other end of the rod is at a temperature of 33 deg. C, what is the rate of heat transfer through the rod (ignore any heat loss

*asked on February 15, 2016* -
## Physics

A styrofoam cooler is a cube with side length of 20.0 cm and walls with thickness of 1.9 cm. If the external temperature is 27.0 deg. C and the cooler contains ice and water at 0 deg. C. How much heat is transferred into the box in 24 hours? - I got

*asked on February 15, 2016* -
## Algebra

A colony of bacteria has a population of ten initially, and doubles in size every three hours. What is the population of the colony after 24 hours of growth ?

*asked on January 24, 2016* -
## science

I have a question from an old exam that I need help to understand, i'm not sure where to start An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the emission of a photon. The photon

*asked on October 16, 2015* -
## Algebra

a). The length of the classroom is 30 ft. The length of the room on the scale drawing is 6 in. Is this correct? Explain why or why not. Michael has made a scale drawing of his classroom. The scale for his drawing is 0.5 in. : 3 ft. b). One of the student

*asked on October 4, 2015* -
## grammar

Which best describes the underlined group of words? Then it was time for Karla, my sister's best friend, to fly home. my sisters best friend is underlined A. adverb phrase B. misplaced modifier C. appositive phrase D. adjective phrase i think its c

*asked on May 28, 2015* -
## Math

Is this independent or not. Carlos tosses a coin that comes up heads. Jennifer tosses a coin that also come up heads.

*asked on May 9, 2015* -
## Math

Math: Is this statement independent or not. Jordan stayed up late last night watching television. Jordan did poorly in his quiz in the morning.

*asked on May 9, 2015* -
## chemistry

I need an example of an elementary reaction to go with the definition An elementary reaction is a reaction in which reactants are converted to products in a single step.

*asked on March 16, 2015* -
## algebra

Ed Moura has $21000 invested in stocks paying 8%. How much additional money should he invest in certificates of deposit paying 4% so that the average return on the two investments is 5%?

*asked on March 12, 2015* -
## chemistry

In the reaction O2+2NO->2NO2 what is the ratio of oxygen reacted to nitrogen dioxide produced? Nitrogen monoxide to nitrogen dioxide? We had to calculate the concentration of each, for which I have O2=-1.01x10^-5, NO=-2.03x10^-5 and NO2=2.04x10^-5. I'm not

*asked on March 12, 2015* -
## chemistry

if the concentration of all the reactants doubled, what works happen to the rate I know the reaction rate would increase, but in a previous example it asked the question and the answer was that the rate increases by 16 and I can't figure out how much it

*asked on March 10, 2015* -
## chemistry

What pairs of ions produce similar colours in the flame test? Use your periodic table of elements to explain the reason for this. The pairs with similar colours were Ba2+ and Cu2+, and Sr2+ and Li+. Ba and Cu had light green-ish colours, and Sr and Li had

*asked on February 17, 2015* -
## math

Sin theta equals 5/12 in quadrant, find the exact value of cos 2theta. I'm not sure how to solve this question, I need some help.

*asked on January 16, 2015* -
## math

rodeo performer spins a lasso in a circle perpendicular to the ground. the circle has a diameter of 118cm. she starts with the knot at the lowest point which is at 90 cm above the ground, she spins the lasso and .5 seconds later the knot is at the highest

*asked on January 16, 2015* -
## AP Calculus

If 600 cm2 of material is available to make a box with a square base and a closed top, find the maximum volume of the box in cubic centimeters. Answer to the nearest cubic centimeter without commas. For example, if the answer is 2,000 write 2000.

*asked on October 16, 2014* -
## Chemistry

-Describe the zero sum rule -True of False: The formula for the nitride ion is N^(-3) -True of False: The stock system shows the charge on the negative ion

*asked on October 1, 2014* -
## Chemistry

Suppose that coal of density 1.5 g/cm3 is pure carbon. (It is, in fact, much more compli- cated, but this is a reasonable first approxima- tion.) The combustion of carbon is described by the equation C(s) + O2(g) −→ CO2(g) ∆H◦ = −394 kJ What is

*asked on May 22, 2014* -
## Chemistry

Calculate the volume of NaOH 0.5 mol/L necessary to neutralize 300 mL of HCl 0.2 M. na= how do I calculate this? Ma= 0.2 M Va= 0.300 L nb= 0.5 mol Mb= 0.5 M Vb= ?

*asked on May 13, 2014* -
## History

Mark the statement if it describes Roman society during the time of Cincinnatus. A. Rome’s government was based on law in which many people had a voice. B. Rome was being surrounded and threatened by outside forces. C. People in Rome admired those who

*asked on April 23, 2014* -
## algebra 2

So I am doing my algebra home work and I get stuck on these three problems. x^2-19x+72 from there idk what to do because nothing multiplies up to 72 and adds up to -19. Same for this one. x^2-25x+48 And x^2+9-90 (X+15) (x-6)

*asked on November 10, 2013* -
## socials 11

why was the issue of West Coast salmon such a controversial issue?

*asked on July 23, 2013* -
## socials 11

what do you think is the best solution for Canada's current healthcare predicaments?

*asked on July 23, 2013* -
## socials 11

why did canada's ties with cuba, in particular, represent a move away from adherence to american foreign policy?

*asked on July 21, 2013* -
## socials 11 (the beginning of the cold war)

in what sense did the concept of MAD keep both sides from going to war?

*asked on July 17, 2013* -
## 4 grade math

Find two mixed numbers so that the sum is 15 3/10 and the difference is 8 5/10

*asked on May 21, 2013* -
## math

Charles mixed pineapple juice and orange juice to make a fruit punch. He made a total of 5 1/2 cups of the mixture and used 2 more cups of orange juice than pineapple juice. How much did he use of each type of juice?

*asked on February 12, 2013* -
## statistics

Scores on the ACT college entrance exam are Normally distributed with a mean µ = 20 and standard deviation σ = 5. An SRS of 25 ACT scores is selected, construct a 95% Confidence Interval for the sample mean (X-Bar) and interpret your result.

*asked on December 3, 2012* -
## Pre Calc

how much money should i invest at 8.2% compounded continuously if i wish to have $100,000 in 5 years?

*asked on November 8, 2012* -
## english

what is the order of imortance? whoever answers this gets to meet my mom the mayor!!!!!!!!!!!!!!!!!!!!

*asked on October 23, 2012* -
## chemistry

When 47.5J of heat are added to 13.2 g of liquid, its temperature rises by 1.72 degrees C. What is the heat capacity of the liquid? A cook wants to heat 1.35kg of water from 32.0 degrees C to 100 degrees C. If he uses combustion of natural gas to heat the

*asked on September 21, 2012*