# Posts by andrea

Total # Posts: 887

physics
A warehouse worker pushes a crate along the floor, as shown in the figure , by a force of 10.0 N that points downward at an angle of 45.0 degree below the horizontal. A. Find the horizontal component of the push. B.Find the vertical component of the push.

physics multiple choice
A person pushes horizontally with constant force P on a 230 N box resting on a frictionless horizontal floor. Which of the following statements about this box is correct? A.The box will accelerate no matter how small P is. B. The box will not accelerate unless P > 230 N. C...

physics multiple choice
A 3.00 lb. physics book rests on an ordinary scale that is placed on a horizontal table. The reaction force to the downward 3.00 lb force on the book is A. an upward 3.00 lb force on the scale due to the table. B.an upward 3.00 lb force on the book due to the scale. C.an ...

physics multiple choice
A force F is required to push a crate along a rough horizontal floor at a constant speed V with friction present. What force is needed to push this crate along the same floor at a constant speed 3V if friction is the same as before? A. A constant force 3F is needed. B. A force...

physics
A Ferris wheel with radius 14.0 m is turning about a horizontal axis through its center, as shown in the figure below. The linear speed of a passenger on the rim is constant and equal to 6.00 m/s. A.What is the magnitude of the passenger's acceleration as she passes ...

physics
You swing a 2.00 kg stone in a circle, using the full length of a thin 80.0 cm rope. At what speed should you swing it so its acceleration will be 9.8 m/s^2?

physics
You swing a 2.00 kg stone in a circle, using the full length of a thin 80.0 cm rope. At what speed should you swing it so its acceleration will be 9.8 m/s^2?

child day care
wao, those answer r really sucky! heres mines 1-D 2- 3-B 4- 5-C 6-A 7- 8-C 9-D 10- 11-B 12-C 13-B 14 15- 16-A 17- 18-C 19- 20-B THESE R ALL BY THE SAME ORDER THAT APPEARS ON THE STUDY UNIT GOOD LUCK! =)

stats
a) Explain the difference between sampling error and no sampling error.

Urgent!!! Physics
A meteor streaking through the night sky is located with radar. At point A its coordinates are (5.60 km, 1.25 km), and 1.12 s later its has moved to point B with coordinates (6.16 km, 0.900 km). A. Find the x component of its average velocity between A and B. (in Km/s) B. Find...

Urgent!!! Physics
At an air show, a jet plane has velocity components Vx = 625 and Vy = 415 at time 3.85s and Vx = 838 and Vy = 365 at time 6.52s . A. For this time interval, find the x component of the plane's average acceleration in km/h2. B. For this time interval, find the y component ...

physics
A brick is released with no initial speed from the roof of a building and strikes the ground in 1.50 {s}, encountering no appreciable air drag. A. How tall, in meters, is the building? B.How fast is the brick moving just before it reaches the ground?

physics
A meterstick is held vertically above your hand, with the lower end between your thumb and first finger. On seeing the meter stick released, you grab it with those two fingers. You can calculate your reaction time from the distance the meterstick falls, read directly from the ...

physics
An object is thrown up at an angle of 40.0 degree above the horizontal and reaches a maximum height H. If the angle is now doubled to 80.0^degree, but nothing else is changed, its maximum height will be a. 1.67 H. b. 2.00 H. c. 2.35 H. d. 4.00 H.

physics
A cannonball is fired horizontally from a 240 {m}-high cliff toward a vertical building 720 {m} away with an initial velocity of 120 {m/s}. When the ball will hit the building? in a. 7.00 {s} b. 6.00 {s} c. less than 6.00 {s} d. more than 7.00 {s}

physics
Problem: A sample of liquid has amass of 1.04 kg and a volume of 1300 ml. If the mass of the sampleis to be increased by 70 g by adding more of the same kind kind ofliquid, what volume of liquid must be added? Solution given: 1) 1040/1300=.80 2) 70/.80=88 1. Give an ...

physics
Problem: Two blocks of metals have the same mass. The first block has a volume of 827 cm^3 and a density of 4.50g/cm^3.Thesecond block has a volume of 193cm^3. What is the density of thesecond block ? Solution: (1) 4.50x827=3720 (2)3720/193=19.3 1. Give an interpretation ( not...

physics
Problem: Two blocks of metals have the same mass. The first block has a volume of 827 cm^3 and a density of 4.50g/cm^3.Thesecond block has a volume of 193cm^3. What is the density of thesecond block ? Solution: (1) 4.50x827=3720 (2)3720/193=19.3 1. Give an interpretation ( not...

physics
Problem: A sample of liquid has amass of 1.04 kg and a volume of 1300 ml. If the mass of the sampleis to be increased by 70 g by adding more of the same kind kind ofliquid, what volume of liquid must be added? Solution given: 1) 1040/1300=.80 2) 70/.80=88 1. Give an ...

physics
B. You can get 28 oz of spicy pretzels for $4.40, or you can get 16 oz of regular pretzels for$2.30. 1. Which is a better deal? Explain your reasoning. 2. How much would 16 oz of the spicy pretzels cost, assuming the same price per ounce?

physics
A. There are 28 g of salt dissolved in 400 ml of water. Consider the quantity 0.07 = 28/400. 1. Give the name of the quantity if there is one. 2. What is the interpretation of . 07 g in this context? 3. Use the interpretation to find the amount of salt dissolved in 19 ml of ...

chemistry
A 0.50 {\rm g} sample of vegetable oil is placed in a calorimeter. When the sample is burned, 18.9 {\rm kJ} are given off.

physics
In 1954, Roger Bannister became the first human to run a mile in less than 4 minutes. Suppose that a runner on a straight track covers a distance of 1.00 mi in exactly 4.00 min. 1. What is his average speed in mi/h? 2. What is his average speed in ft/s? 3. What is his average ...

Math
idk

Chemistry
0.50 mol

geometry
no because 2+6 has to be greater than 11

i think it us 45%

Physics
A thing rod of length L and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass 5.00kg is attached to the other end. The rod is pulled aside through an angle 30.0 degrees and released. What is the speed of the ball at the lowest ...

Physics
A 24 inch string is wrapped around the 1/8 inch radius axis of a yo yo. Starting from rest the yo yo descends with a constant angular acceleration of 4 rad/second squared. How long will it take the string to completely unwind?

math
5.625 pounds.

social studies

social studies
In what ways did Europeans' desire for trade with Asia affect the western hemisphere?

social studies
No, Hitler committed suicide in his bunker with Ava Braun * Spelling*

Physics
So I choose the bottom right corner as the pivot point. The radial arm up to point P is the length L of the side of the sign, and the horizontal force is perpendicular to this radial arm. The weight acts straight down, so the radial arm perpendicular to the weight is half the ...

Chemistry
why would acetic acid concentration of a good vinegar need to be known for commercial reasons and regulatory health and safety reasons

Chemistry
suppose a pippetting error was made when preparing the diluted vinegar, but the diluted vinigar solution was uniform and the naoh titration values were consistant. when will the student learn that the experiment result was not accurate explain

Chemistry
A student did not fully mix the solution of Oxalic Acid in the volumetric flask predict and explain the effect of the range of the students titration volumes when using the NaOH solution to titrate the Oxalic Acid solution

Chemistry
what are 1 or 2 causes of loss of product that you may observe when synthesising a coordination compound sorry more detail we were synthesising Copper sulfate pentahydrate CuSO4.5H2O And Potassium oxylate dihydrate K2C2O4.H2O

Chemistry
how could you improve the product yeild if you had to redo the synthesis

Chemistry
what are 1 or 2 causes of loss of product that you may observe when synthesising a coordination compound

Chemistry
if it takes 20 h to convert 100g of reactant A to roduct C at 20 degrees celcius, approximately how many minutes would it take at 110 degrees celcius? I know the answer, I just don't know how to get the answer

Spanish
Thank you-that's where I was confused

Spanish
If this is what they are saying in Spanish- "Yo me llamo Joey.“ Vivo en Chicago pero soy de Springfield. “ How would I answer these two questions? ¿De dónde es Joey? ¿Dónde vive? Thank you

Chemistry
The following reaction is used to produce tungsten(VI)oxide: WS3(s) + O2(g) ¨ WO3(s) + SO2(g) The WO3 is then heated and undergoes a decomposition reaction produce tungsten and oxygen gas. How many grams of tungsten could be produced if 39.27 grams of WS3 are used

Chemistry
Given the following reaction: HCl(g) + SrO(s) ¨ SrCl2(s) + H2O Calculate the mass of HCl in grams that would react with 11.44 kg SrO.

social studies
what do the egyptians stuff in the eye sockets of mummies?

Chemistry
What are the sizes of BCl3, CCl4, NCl3, and Cl2O in comparison to one another. For example BCl3<CCl4<NCl3.... I know that isn't right but I need to know this to find difference in bond lengths and some of these molecules are close together in size so I'm not sure...

physics
A 40%-efficient car engine accelerates the 1300 kg car from rest to 20 m/s How much energy is transferred to the engine by burning gasoline? .

physics
A 30 kg child slides down a playground slide at a constant speed. The slide has a height of 3.8m and is 7.8m long. using energy considerations, find the magnitude of the kinetic friction force acting on the child.

Psychology
Why do you believe that researchers would want to see if there isa correlation rather than just fully testing ech variable?

Physics
Two metal spheres, each weighing 24.0 kg are placed 0.0500 m apart. Calculate the magnitude of the gravitational force the two spheres exert on each other.

Chemistry
A solution of ethanol (C2H5OH) in water is prepared by dissolving 61.9 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this solution?

english
what is the difference between direct and indirect references?

Yes

chemistry
Suppose 150.0 mL of 0.50 M HCl and 150.0 mL of 0.50 M NaOH, both initially at 24.0°C, are mixed in a thermos flask. When the reaction is complete, the temperature is 27.4°C. Assuming that the solutions have the same heat capacity as pure water, compute the heat ...

college
A coin dealer, offered a rare silver coin, suspected that it might be a counterfeit nickel copy. The dealer heated the coin, which weighed 14.0 g to 100°C in boiling water and then dropped the hot coin into 29.5 g of water at T = 15.0°C in an insulated coffee-cup, and ...

Chemistry
I'm really confused.. I got .92 % is that correct?

Chemistry
If 5.86g of glucose are reacted and 1.44L of CO2 gas are collected at 293K and .984atm. What is the percent yield of the reaction? C6H1206 -> 2C2H5OH + 2CO2

history
Why is the studying the history of Western ideas helpful for understanding your ideal of social or political and aesthetic developments today/ Explain

Physics
Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized? How much work was &#...

Physics
One gram of water is placed in a cylinder and the pressure is maintained at 2.0 x 105 Pa. The temperature of the water is raised by 31oC. Determine the change in internal energy when, a) the water is in its liquid phase and causes an expansion of 1.0 x 10-8 m3. b) Water is in ...

Physics
An ideal gas in a rigid container (constant volume) has its pressure cut in half slowly. In the process, 265 kJ of heat left the gas. (a) How much work was done during the process? (b) What was the change in internal energy of the gas during this process?

College Physics
Margaret walks to the store using the following path: 0.420 miles west, 0.265 miles north, 0.300 miles east. What is her total displacement? That is, what is the length and direction of the vector that points from her house directly to the store?

physics
is the answer 123.79 kg? or Newtons? thank you for the help

physics
The two angled ropes used to support the crate in the figure below an withstand a maximum tension of 1300 N before they break. The left angle is 30dregres, and the right angle is 45degrees. What is the largest mass the ropes can support? m=?

How did a bill become a law??

English
Thank you

English
The climax of "The Lottery" is when: A.The Hutchinson family is selected as the lottery winners B.Tessie is selected as the final lottery winner C.Tessie is stoned to death by the village I'm leaning towards B but I'm not sure if maybe it is C but I think C ...

English
I think selection "a" about the village residents gather for a lottery, etc: Is that correct?

English
Who is the main character of "The Lottery" and what best describes the story's plot? I think the main character is Yessis Hutchinson, correct? Which best describes the plot? Answers: A.Village residents gather for a lottery, one family is named the winning family...

Physics
If someone could point me in the right direction-please!!! A car with an initial speed of 4.30m/s accerlerates uniformly at the rate of 3.00 m/s ^2. Find final speed after 5.00s. Thanks for any help you can provide.

Physics
With an average acceleration of negative 1.2m/s squared, how long will it take a cyclist to bring a bicylcle with an initial speed of 6.5 m/s to a complete stop? answers are: either 2.0, 5.4. 0.18 or -1.8s Please help-I am totally confused

algebra
in 1990, the life expectancy of males in a certain country was 68.1 years. in 1995, it was 70.9 years. let E represent the life expectancy in year t and let t represent the number of years since 1990 F(x)=

physics
A racing dog is initially running at 15.0 m/s, but is slowing down.How fast is the dog moving when its kinetic energy has been reduced by half? By what fraction has its kinetic energy been reduced when its speed has been reduced by half?

finance
You have found three investment choices for a one year deposit: 10% APR compounded monthly, 10% APR compounded annually, and 9% APR compounded daily. Compute the EAR for each investment choice. Assume that there are 365 days in the year.

Physic
How many kilometers would you have to go above the surface of the earth for your weight to decrease to half of what it was at the surface?

Physic
A bowling ball weighing 71.2 N is attached to the ceiling by a 3.60 m rope. The ball is pulled to one side and released; it then swings back and forth like a pendulum. As the rope swings through its lowest point, the speed of the bowling ball is measured at 4.00 m/s. At that ...

Physic
What is the period of revolution of a satellite with mass m that orbits the earth in a circular path of radius 7820 km (about 1450 km above the surface of the earth)?

Physic
An unstretched spring is 11.0 cm long. When you hang an 590 g weight from it, it stretches to a length of 14.0 cm. what is the force constant in (N/m) of this spring? what is the total mass must you hang from the spring to stretch it to a total length of 18cm?

Physic
thanks i got the answer :)

Physic
with the speed of 8.60m/s and slides 38m

Physic
A hockey puck leaves a player's stick with a speed of 8.60 and slides 38.0 before coming to rest. Find the coefficient of friction between the puck and the ice.

BIOLOGY TEACHER
Biology teacher help me with two questions. what role do microorganisms play in ecological succession? describe ecological succession in terms of changes in the abiotic parts of an ecosystem

BIOLOGY KK think I got it
microorganisms are nonliving and the ecological succession changes the abiotic parts in an ecosystem.

BIOLOGY
what role do microorganisms play in ecological succession? they play role in ecosystem by occuping a niche. have i got it down correct?

Biology/ms. sue
I don't get how to describe the ecological succession in terms of changes in the abiotic parts of an ecosystem. What words do i use to describe all that, i can't just insert my example as an answer in my work, what do I do?

Biology/ms. sue
ms. sue help =-(

ms sue y u not helping me
ms sue i wanna get this done before going to sleep, please provide me with help, atleast the first question, i don't get it. could you give me a small anser so i can atleast figure whats going on.

BIOLOGY teacher ms sue

BIOLOGY teacher ms sue
So for ex. the cutting of trees reduces oxygen(air)?

BIOLOGY teacher ms sue
so for ex. the clearing of parcel of land which would bring out the plants. is this what ur looking for?

BIOLOGY teacher ms sue
Could you put that question in simple terms so i can understand. Im talking about this one describe ecological succession in terms of changes in the abiotic parts of an ecosystem.

BIOLOGY
what role do microorganisms play in ecological succession? they play role in ecosystem by occuping a niche. have i got it down correct?

BIOLOGY
so it's the tundra.

BIOLOGY
could ya tell me what sand dune and wetland refer to?

BIOLOGY
which of the following are mature(climax) communities? a tundra b sand dune c temperate rainforest d wetland I'm guessing it's sand dune or wetland

BIO teacher help
it means nonliving things in an ecosystem like sunlight, temperature, etc.

BIO teacher help
could ya look again? i said yes i do know what it abiotic means.

BIO teacher help
i really don't understand that question.

BIO teacher help
ms sue i got an answer

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