# Posts by Hannah

Total # Posts: 3,341

**Physics**

Starting with an initial speed of 3.86 m/s at a height of 0.480 m, a 1.78-kg ball swings downward and strikes a 4.75-kg ball that is at rest, as the drawing shows. (a) Using the principle of conservation of mechanical energy, find the speed of the 1.78-kg ball just before ...

**Physics**

The moon is a satellite that orbits the earth at a radius of 3.85 × 108 m. The mass of the earth is 5.98 × 1024 kg. What is the orbital speed of the moon?

**Science**

How does the direction of the electric current, moving across a battery powered device, differ from the direction of travel in the AC current sent to homes and businesses

**Science**

Thank You

**Science**

Batteries are made of two metals with different electron affinities. What does the phrase “electron affinity” mean and how does this affinity affect the voltage of the battery

**Physics**

Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speeds of the planets are determined to be 36.0 km/s and 50.6 km/s. The slower planet's orbital period is 7.78 years. (a) What is the mass of the star? (b) What ...

**Physics**

A "swing" ride at a carnival consists of chairs that are swung in a circle by 11.5 m cables attached to a vertical rotating pole, as the drawing shows. Suppose the total mass of a chair and its occupant is 204 kg. (a) Determine the tension in the cable attached to ...

**Math**

An art teacher has a box of pencils. 1/10 are green, 1/2 are blue, 1/4 are orange, and the remaining 45 are red. How many pencils are orange?

**English**

Please check my answers. Which of the following sentences is punctuated correctly ? On January 1, 2000, many people thought that the new millennium would bring the end of the world,but it didn't ******** On January 1 2000, many people thought that the new millennium would ...

**chem**

X would be too high because the product would weigh more since it wouldn't be completely dried.

**Physics**

A person is trying to judge whether a picture (mass = 2.37 kg) is properly positioned by temporarily pressing it against a wall. The pressing force is perpendicular to the wall. The coefficient of static friction between the picture and the wall is 0.760. What is the minimum ...

**Physics**

A rocket blasts off from rest and attains a speed of 53.8 m/s in 17.4 s. An astronaut has a mass of 67.2 kg. What is the astronaut's apparent weight during takeoff?

**Physics- PLEASE HELP!!**

Add together these vectors: V1= 60 Newtons at 45 degrees N of W; V2= 5Newtons at 30 degrees S of E Is it 62.25N@40.50 S of E??

**Quick english check**

Is 1 ponderous? Is 4 homogenous? Is 9 wary? Is 10 alloyed?

**Quick physics check**

Add together these vectors: V1= 60 Newtons at 45 degrees N of W; V2= 5Newtons at 30 degrees S of E Is it 62.25N@40.50 S of E??

**Physics help**

A plane flies 230 mph at 60 degrees north of west for 2.5 hours. Answer the following questions. A. How far did it travel total? B. How far west did it go? C. How far north did it go? D. How fast did it go west? I don't know how to do this problem :(

**Statistics**

The second question is 0.754 because of this equation: (10C5)= (0.5^5)(0.5)^5 = 0.246 P(E')= 1-P(E) = 1-0.246 = 0.754

**Math**

Translate two thirds of the sum of r and 9 plus the product of 8and s

**College Algebra**

The monthly cost in dollars from producing x units of an item is given by the cost function C(x)=2x^2-160x+18400. How many units will result in the minimum cost? I do not know how to start this problem. Thank you for your help!

**Physics**

A 45 kg girl is sitting on one end of a see-saw, 0.6 m away from the the pivot pt. How far away form the pivot pt must a 60 kg boy sit on the other side in order for the see saw o be balanced?

**Physics**

a uniform meter stick is at rotational equilibrium when 220 g is suspended at 5 com, 120 g is suspended at 90, and the support stand is placed at the 40 cm mark what is the mass of the meter stick?

**HELP**

M = 2497

**Conversions?**

1. 41.06 km 2. -30

**Math**

Change the function below into standard form (y = a cos[b(x-h)]+k) then give the vertical shift. y = (cos[2x-π])/3 is this right: y = 1/3 cos[2(x-π/2)]+1/3 vertical shift: 1/3 up

**Social Studies**

I got 8/8!! 1 is D

**Social Studies**

Okay so is 1. D?

**Social Studies**

Is 3. C and 6. A and 1. A?

**Social Studies**

1. What do colonialism and imperialism both require? A. one country giving money to another B. 2 countries sharing resources** C. 2 countries working together D. one country ruling another country 2. What did West Africans trade to North Africans in exchange for salt? A. ...

**math (please)**

There is a 60% that your math teacher will give a pop quiz tonight and, due to the fact that you have a soccer game, there is an 85% chance you will not be able to do your math homework. You decide that you will do the homework if the probability of there being a pop quiz and ...

**Math**

or 2 could be D?? and 1 could be C?? anyone?

**Math**

There is a 60% that your math teacher will give a pop quiz tonight and, due to the fact that you have a soccer game, there is an 85% chance you will not be able to do your math homework. You decide that you will do the homework if the probability of there being a pop quiz and ...

**Physics**

As an aid in working this problem, consult Interactive Solution 3.62. A ferryboat is traveling in a direction 32.0 ° north of east with a speed of 5.38 m/s relative to the water. A passenger is walking with a velocity of 1.50 m/s due east relative to the boat. What is (a) ...

**Physics**

In a marathon race Chad is out in front, running due north at a speed of 3.98 m/s. John is 95 m behind him, running due north at a speed of 4.52 m/s. How long does it take for John to pass Chad?

**Physics**

An airplane with a speed of 82.2 m/s is climbing upward at an angle of 71.6 ° with respect to the horizontal. When the plane's altitude is 772 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...

**physics**

A volleyball is spiked so that it has an initial velocity of 19.9 m/s directed downward at an angle of 55.8 ° below the horizontal. What is the horizontal component of the ball's velocity when the opposing player fields the ball?

**Physics**

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.890 m/s at an angle of 36.0° above the table, and it lands on the magazine 0.0660 s after leaving the table. Ignore air resistance. How thick is the magazine? ...

**Physics**

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 660 m/s. The gun is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.027 m below the center. What is the horizontal distance between the end of the rifle...

**Physics**

A mass hangs on the end of a massless rope. The pendulum is held horizontal and released from rest. When the mass reaches the bottom of its path it is moving at a speed v = 2.4 m/s and the tension in the rope is T = 15.5 N. A peg is placed 4/5 of the way down the pendulum’...

**MS SUE PLEASE HELP LANGUAGE ARTS**

I put C and i got it right YAYY

**MS SUE PLEASE HELP LANGUAGE ARTS**

:((

**WRITEACHER??CAN YOU HELP**

PLEASEE

**MS SUE**

MS SUE???

**MS SUE PLEASE HELP LANGUAGE ARTS**

I think it might be B

**MS SUE PLEASE HELP LANGUAGE ARTS**

another person had this same question but you did not answer and I'm confused

**MS SUE PLEASE HELP LANGUAGE ARTS**

Since “Harriet Tubman” is in the narrative essay genre, which of the following would be most suitable to add at the end of the piece? A. a summary of the obstacles Harriet endured B. a flashback to Harriet in her childhood C. a scene of Harriet as an elderly woman D...

**Math- Please help**

I'm in desperate need of help on how to do these 4 problems. Write the function g(x) with the indicated transformations. 1. f(x)=x; translated right 3 units 2. f(x)=x^2; vertical stretch by 5, translated down 3 units and reflected across the x-axis 3 f(x)=|x|; vertical ...

**Math**

bus A stops every 12 minuets Bus B stops every 9 minuets on the same circuit they stop at the same bus stop at 9:15 am when is the next time this will happen ??

**Quick Algebra Help**

write the sentence as an absolute value inequality. I have no clue how to do this! 1 a number less than 4 units from 0 2. a number is more than 11 units from 8 3. half a number is at least 2 units from 20

**Quick Algebra Help**

The rules for a book report say that the report should have 300 words with an absolute value deviation of at most 20 words. Write and solve an absolute value inequality that represents the acceptable number of words.Please help me!

**Quick algebra help**

What would this look like if a write a function g whose graph represents the indicated transformation of the graph of f? 1. f(x)= |x| translation of 5 units left and 2 units up 2. f(x)=x^2; reflection in the c axis and translation 8 units left

**physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 6.27 m/s. The car is a distance d away. The bear is 32.1 m behind the tourist and running at 9.06 m/s. The tourist reaches the car safely. What is the maximum possible value for d?

**Physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.34 m. The stones are thrown with the same speed of 9.35 m/s. Find the location (above the base of the ...

**Math**

What are the steps, though?

**Physics 111**

A boat is crossing a river. The velocity of the boat relative to the water is 4.0 m/s directed perpendicular to the river's current. The velocity of the current relative to the shore is 2.0 m/s. How long will it take for the boat to cross the river?

**Physics**

The gravitational force between two masses is 500N. What is the gravitational force if the masses are doubled and distance between them is likewise doubled? What formula/s should I use?

**Physics**

A motor cyclist travelling at 12m/s decelerates at 3m/s square a) how long does he take to come to a rest b) how far does he travel in coming to rest

**AP Chemistry**

Please show me how to do this step by step I would appreciate it We add excess Na2CrO4 solution to 42.0 mL of a solution of silver nitrate (AgNO3) to form insoluble solid Ag2CrO4. When it has been dried and weighed, the mass of Ag2CrO4 is found to be 0.520 grams. What is the ...

**Chemistry**

Excuse you DrBob222 first of all no one wasted your time secondly you didn't even explain it to me and lastly I don't think I reposted it and if i did it was a mistake. Good day.

**Chemistry**

nevermind I figured it out!

**Chemistry**

please show me step by step how to do this so i can figure out the rest We add excess Na2CrO4 solution to 42.0 mL of a solution of silver nitrate (AgNO3) to form insoluble solid Ag2CrO4. When it has been dried and weighed, the mass of Ag2CrO4 is found to be 0.520 grams. What ...

**math**

Please help. mr trocki is the groundskeeper for a vacation resort. he has programmed the sprinkler system to run at night in three different zones. The sprinklers turn on at midnight and run until 7am. the fist zone runs every 90 minutes, the second zone turns on every 40 ...

**Math**

mr trocki is the groundskeeper for a vacation resort. he has programmed the sprinkler system to run at night in three different zones. The sprinklers turn on at midnight and run until 7am. the fist zone runs every 90 minutes, the second zone turns on every 40 minutes, and the ...

**Quick chemistry help**

The primary purpose of the scientific method is to A. Solve problems B. Design experiments C. Make observations D. Publish theories Is it c?

**Chemistry**

an empty flask as a mass of 123.4 grams. When the flask is filled with water, the mass is 211.6 grams. If 10.0 grams of zinc (d=7.14 g/cm3) are added to the flask filled with water (and the sides of the flask are dried from the displaced water) what is the new mass of the flask?

**physics**

A speed skater moving across frictionless ice at 9.0 m/s hits a 5.3 m -wide patch of rough ice. She slows steadily, then continues on at 5.8 m/s. What is her acceleration on the rough ice? Express your answer using two significant figures.

**Language Arts**

party

**Chemistry**

Why may the absorbance of a filtrate be higher than it's theoretical concentration?

**Physics**

A stone is dropped into a well of depth 11 m. How long after that, the sound of the splash can be heard? Given speed of sound =343ms^-1

**Physics**

A stone is thrown upwards from the roof with a velocity 15ms^-1 at an angle 30degree to the horizontal. The height of the building is 40m.calculate the magnitude of the velocity of the stones before it strikes the ground.

**Physics**

A long jump athlete take off at 25 degree with the horizo and achieves a jumping distance of 9.12 m. (i) calculate the initial take-off speed (ii) calculate the maximum height of the jump.

**Chemistry**

Will addition of water to vinegar affect the determination of its concentration? Why?

**Physics**

Water flows out horizontalmy at the end of a pipe at a height of 52 cm from the floor.If the horizontal distance before it hits the floor is 100 cm,calculate the velocity of the water at the instant it leaves the pipes?

**Science**

Water flows out horizontalmy at the end of a pipe at a height of 52 cm from the floor.If the horizontal distance before it hits the floor is 100 cm,calculate the velocity of the water at the instant it leaves the pipes?

**Pre-Algebra**

PL?o<l

**Chemistry**

Did Dalton and Thomson believe that the atom was made of solid mass?

**Math**

if height is equal to 2.20m at exactly 9am, and then the height is equal to 1.7m at exactly 10am. At what approximate time will the height be equal to 1.71m

**Science 8**

I need help on this portfolio project, I have to do a lab report on light refraction. The research question is "How does change in medium affect light?" and I need to make a hypothesis, but I don't know what to put.

**Statsistics**

You are testing the claim that the mean GPA of night students is less than the mean GPA of day students. You sample 45 night students, and the sample mean GPA is 2.18 with a standard deviation of 0.31 You sample 30 day students, and the sample mean GPA is 1.97 with a standard ...

**Maths**

11:58 is 3 mins slow. 12:05 is 3 mins fast. Which is the correct time?

**History**

What is the definition of strategoi?

**History**

What is the definition of strategy?

**Geometry**

What would the volume be if the radius of a sphere is 16m?

**Geometry**

Find the area of the regular triangle with a perimeter of 36 cm. how do I do this?

**linear algebra**

Let L: R2 ¨ R2 be a linear transformation for which we know that L(1 1)= [-2 1] L(-1 1)=[3 2] a)what is L(-1 5) b)what is L(u v)?

**Math**

The perimeter of a rectangular garden is (3x + 12) feet. What is the perimeter of the garden in factored form?

**AP Physics**

The linear speed=radius*angular speed. Linear speed/radius=angular speed. 48.9/220=0.222273

**Physics**

pressure=density*g*height. ~1000*9.8*4=39200 Pa, 39.2kPa

**Science**

There are more or less 8 lunar phases. Divide the month (30 days) into 8=3.75. Full moon the 1st. Waning Gibbous the 4th. Third quarter the 7th. New moon the 14th. First quarter the 21st. Full moon again the 30th.

**PHYSICS**

In a power plant the high pressure turbine trips due to an unauthorised valve shutdown. What are a) what is the angular acceleration of the turbine blade? b) what is the distance travelled by a point on the rim of the turbine blade during the acceleration? c) what is the ...

**Geometry**

A post tree outside of matts house casts a 12 foot shadow at a certain time of day. At the same time matt, who is 6 feet tall, casts a 2 foot shadow. How tall is the tree? How do I solve this? The marketing department of the company is considering making a keychain with a ...

**Geometry help**

if the volume of a rectangular prism is 420 cubic units what is its vilume if one dimension is halved a second dimension is reduced to one third its original length and a third dimension remains unchanged? How would I do this?

**physics**

Question Part Points Submissions Used 1 –/2.35 0/100 Total –/2.35 ... Janet wants to find the spring constant of a given spring, so she hangs the spring vertically and attaches a 0.53 kg mass to the spring's other end. If the spring stretches 3.9 cm from its ...

**Chemistry**

100 ml of 15 g/L silver nitrate reacts with an unknown concentration solution of copper (ll) chloride. the reaction for me only 2 grams of silver (l) chloride. If 75 mL of the copper (ll) chloride solution was mixed in, what is the initial concentration of the solution?

**chemistry**

If you dissolve 3.5 moles of CaCl2 in a solution, how many moles of C+2 ions and C- ions will there be in the solution?

**language arts**

Y'all crack me up "connexus gang, its Aliyah" "Just took both quizzes without reading anything" XD same guys same. Thanks

**Math**

In a survey of 300 college graduates, 58% reported that they entered a profession closely related to their college major. If 6 of those survey subjects are randomly selected without replacement for a follow-up survey, what is the probability that 3 of them entered a profession...

**statistics**

According to a college survey, 22% of all students work full time. Find the mean and standard deviation for the number of students who work full time in samples of size 16.

**statistics**

An unprepared student makes random guesses for the ten true-false questions on a quiz. Find the probability that there is at least one correct answer.

**English.**

Sondra did...