# Posts by anonymous

Total # Posts: 116,316

PHYSICS HELP
A mercury atom drops from 8.82 eV to 6.67 eve. 1) What is the energy of the photon emitted by the mercury atom? 2) What is the frequency of the photon? 3)What is the wavelength?

PHYSICS HELP
An object 4.0 mm high is 10 cm in front of a concave mirror having a 6.0 cm focal length. Find the height by means of; a) the lens/ mirror and magnification equations.

Physics
Thank you

nats
The Earth receives radiation from the Sun as if the Sun is a blackbody emitter at the temperature near 6000 K, although the temperature inside the Sun is about 15 million K. Explain why?

Math
Need help solving this! R=20Cos0 N + 50cos135N+50sin135E+10Cos225N+10sin225(-E)

math
A scuba diver dove from the surface of the ocean to an elevation of ÃƒÂ¢Ã‹â€ Ã¢â‚¬â„¢89 9 10 feet at a rate of ÃƒÂ¢Ã‹â€ Ã&...

math
A scuba diver dove from the surface of the ocean to an elevation of ?89 9 10 feet at a rate of ?24 feet per minute. After spending 11.75 minutes at that elevation, the diver ascended to an elevation of ?8 9 10 feet. The total time for the dive so far was 18 1 8 minutes. What ...

Algebra 2
What transformations change the graph of f(x) to the graph of g(x)? f(x)=x squared; g(x)=(x+7)squared +9

Algebra 2
Let g(x) be the reflection of f(x)=3x+2 in the x-axis. What is a function rule for g(x)? a. g(x)=3x-2 b. g(x)=-3x-2 c. g(x)=3x+2 d. g(x)=-3x+2

Algebra 2
the function f(x)=-5x. The graph of g(x) is f(x) vertically compressed by a factor of 1/4 and reflected in the x axis. What is the function rule for g(x)

Physics
A moving-coil instrument gives a full-scale deflection when the current is 40mA and its resistance is 25 ?. Calculate the value of shunt to be connected in parallel with the metre to enable it to be used as an ammeter for measuring currents up to 50A

Math
help i need help with the unit 4 lesson 11 test pleeaasseee.

unit 4 lesson 11 pleeaassee hhheeelllppp

maths
Gabrial is 11years older than Collins in5years time ,gabrial will be twice as old as Collins?

Physics
relative to the floor it is m g h but relative to the desktop it is zero. You can do no work moving it down to the desk top if it is already on the desk top.

Physics
An 8.0-kg history textbook is placed on a 1.25-m high desk. How large is the gravitational potential energy of the textbook-earth system relative to the desktop?

Algebra
50 calories per day for every 2 pounds body weight. How many calories a 175 pound athlete consume per day?

physics
85*9.81 - 745 Newtons

Physics
A 50kg by runs up the steps to the third floor of height 10.5m in 45s.While at the third floor,the boy drops a 0.25kg ball and strike the ground 1)Calculate the rate of work done. 2)By using work-energy theorem,calculate the speed of the ball just before it strikes the ground...

math
where do I place the parenthesis in this problem so that the answer is 7? 4-3*2+6=7

math
6 people share 3/5 pound of peanut equally

math
String A is 35centimeters long. String B 5 times as long string A. Both are necessary to create a decorative bottle find the total length of string needed for 17 identical decorative bottles express your answer in meters

Solving One-Step Inequalities

Solving One-Step Inequalities
Solve each inequality. 1/5 is less than or equal to x/15 70-a is greater than or equal to 25 I am really confuse about this and I Don't want cheating, I just want steps because I am not really getting this at all. Thanks! Also, this is for Ms.Sue, I know you say that you ...

LA helppp
Ms Sue?

Solving One-Step Inequalities
Oh ok thanks! Good to know

Solving One-Step Inequalities
Solve this inequality. 2 is greater than or equal to s-2 Sorry if I didn't write it in a simple way, I guess. I couldn't write the sign of greater than or equal to.

Biology
(How would I go about doing this?) Design an experiment that tests the effect of different concentrations of carbon dioxide on the rate of photosynthesis. 1. A specific question easily measurable and clearly stated 2. A hypothesis that is clearly stated and contains measurable...

Math/fire dynamics
132 hours

Math
24. Multiple Choice For which pair of numbers is the greatest common factor 8? Anwer

Physics
1000*9.81 /(20*0.80) Newtons

Physics
A system of pulleys is used to lift a load of 1000kg.if the efficiency of pulley system is 80%and velocity ratio is 20,find effort required to lift the load...............??

AP Statistics
why might s be more commonly used than s squared as a measure of variability?

Science
An environmental impact statement must include: a) an ethical analysis of the proposed action. ***************** b) short- and long-term effects and any adverse environmental effects. +++++++ I would pick b) but go with your text *************** c) solutions to any potentially...

Science
If don't mind could you check my answers for environmental science 1.The interdisciplinary study of humanityâ€™s relationship with other organisms and the non-living physical environment is termed: a) ecology b) sociology c) political science d) risk ...

Science
Using a complete sentence, state what would mostly likely to happen to the production of oxygen by duckweed plants if the intensity and duration of exposure to light were increased

buissness math
One-sixth of all sales at a local Subway are for cash. If cash sales for the week were \$690, what were Subway's total sales?

Math
When you add the same number to both sides of an inequality, is the inequality still true? Explain how you know that your conjecture holds for subtracting the same number.

math
19. Track The sketch at the right shows the distance three runners travel during a race. Describe what occurs at times A, B, C, and D. In what order do the runners finish?

Texas State History

math
Product no.is 0.0925 and one is0.37 find the other no.

Math
Solve the system of equations to find x,y,z (hint let d=x2 e=y2 and d=z2 . Find d e and f first) !!where ever you see 2 it's supposed to be a squared sign. I've seen questions answered similar to this but I don't understand how to get z^2 and y^2 X2+y2+z2=9 3x2-y2-...

math
Find the minimum of P = 7x + 4y subject to 3x + 5y ? 20 3x + y ? 16 ?2x + y ? 3 x ? 0, y ? 0

Math
46.75 = x (55) x = .85 so 100 - 85 = 15% reduction

Calculus
well, have you tried? for starters [ 1 - x/(1-x) ] / [ 1 + x/(1-x) ] [1-x-x ] / [ 1 -x+x ] [ 1-2x ] / 1 1-2x

Calculas
y= 1/x ?7 Find the domain of this function

Math problem help
Never mind I got it sorry

Math problem help

Physics
F = d/dt(mv) = m g = 4000 *9.81 v * 60kg/s = 4000 * 9.81

Math
2 sin x cos x = sin 2x = sin 30 = 1/2

maths
(1/2) pi r^2

Math
4 r x=x r = .25 25%

Biology
what happens in the stomach at a molecular level?

Biology
The pH of stomach acid is about 1.0. • What effects does this have on digestion? • What type of nutrients is broken down in the stomach, and what type of reaction is this?

x^2 + y^2 + z^2 = 9 sphere center at origin radius 3 or using that suggested notation d + e + f = 9 3d - e -f = 7 e + 2f = 6 3d+3e+3f = 27 3d-e-f=7 ------------- 4e+4f=20 e+f = 5 e+2f=6 e+1f=5 ------------ f=1 then e = 4 d+1+4=9 d =4 so x=2 y=2 z=1

Physics
If you have ten events per second then you have one event every 1 event every tenth of a second.

science
Both a globe and flat world map can model features of Earth. Give an example of when you would use each of these models.

chemistry
The electrons I know actually repel each other. They are attracted mainly to the other, positive, sign.

Centripetal acceleration help
Thank you!

Centripetal acceleration help
both are wrong...

Centripetal acceleration help
If a ladybug weighs 20g and is circling at a radius of 10 cm at 10 m/s, what is its centripetal acceleration m/s^2? I know centripetal acceleration = velocity squared/r, and velocity = angular velocity * radius... From these calculations I get 39476.089 m/s^2, which is wrong ...

Chemistry
the solubility product of barium sulphate at 18Â°c is 1.5x10^-9.its solubility at same temperature is

Health care management
_______ is the process of checking performance against standards. A. Appraising B. Planning C. Controlling D. Organizing B

Health care management
Ideally, control should be a/an _______ function. A. retrospective B. anticipatory C. corrective D. reactive D

MATH
Use a property of rational exponent to simplify this equation (C^6) ^7

MATH
Use a fractional exponent to write the expression the fourth root of 81 raised to the ninth power

Math
14

Chemistry
Thank You. Where do you get the 4 from the orchard calculation? And how I would figure out the ppm?

Chemistry
The pesticide DDT (C14H9Cl5)... Express these concentrations in ppm and in milimoles per liter. Orchard - Sample size: 250.0mL Mass of DDT: 0.030 mg Residential - Sample size: 1.750 L Mass of DDT: 0.035 mg Residential After a Storm - Sample size: 50.0 mL Mass of DDT: 0.57 mg ...

Social Studies
thanks

Social studies
1. C, B 2. A 3. C 4. D 100% Connections Academy. They just scrambled all the answers.

social studies
yea c i think

algebra
Solve the following equation for p: 5s - 3p = fp + 12

Math
1.What is the sum of 5/6 + 2/3? (1 point) A. 1 1/3 B. 1 1/2* C. 1 2/3 D. 1 3/4 2. Sylvia has 6 1/2 boxes of chocolate to share at a family picnic. If she gives each person1/3

Math
A rectangle has the length of 5x and the width of 5x-4. Find the perimeter and the area of this rectangle.

Physics: why is my answer wrong??
What effect does doubling the radius of the circle that an object travels have on its centripetal force, if everything else is constant? I think it should double centripetal force, but that is marked wrong, even though I used a test case. My test case was 22kg mass, 1.25-2.5m ...

Math
5/13t=-9 Can someone show me the steps on how to do this please??

Chemisty
How do you know if a solution has the basis of ability to conduct electricity?

Chem
How would you figure out PPM when given mL and mg?

Chemistry
The answers I got for the formula are not the correct ones.

Chemistry
Calculate the final concentrations of the following aqueous solutions after each has been diluted to a final volume of 25.0 mL: a. 3.00 mL of 0.175 M K^+ b. 2.50 mL of 10.6 mM LiCl c. 15.00 mL of 7.24 * 10^-2 mM Zn^2+ the answers are A) 0.0210 M Na^+, B) 1.28 *10^-2 mM LiCl, C...

physics
cheetahs, the fastest of the great cats, can reach 45 mph in 2.0 s starting from rest. assuming that they have constant acceleration of 33 ft/s throughout that time, find the distance (in ft) they travel during that time.

World History
What events contributed to the rise and fall of the Egyptian Empire?

finance
Stock A is expected to provide a dividend of \$10 per share forever. Stock B is expected to pay a dividend of \$5 next year, after which dividends are expected to grow forever at 5.4%. finally, stock C is expected to pay a dividend of \$2 in two years after which dividend growth ...

social studies
What did Elizabeth Freeman's heroic impact leave behind?

physics
How do you know the answer is .682 if you can't get there.

physics
A Lamborghini sports car can accelerate from zero to 60 mph in 4 seconds. It can decelerate from 60 mph to rest in 120 ft. What is the ratio of average acceleration over average deceleration? (1 mile = 5280 ft). I know the answer is .682, but I'm not sure how to get to that.

S.S
which form of government provides funding for maintaining the infrastructure for bridges and highway A. local government B. regional government C. state government D. federal government

physics
a body is moving with a velocity v over a rough horizontal surface and comes to rest after traversing a distance s then the co-efficient of friction between body and the surface is

Algebra
I would like some help on this problem.... A rectangular photograph has an area of 40 square inches. If the width of the photograph is 3 inches more than its height, find the dimensions of the photograph.

Algebra
John takes one hour more than Rikki to rake the leaves from their yard in the fall. If the two work together, they can rake the leaves in 2 hours. How long does it take John, working alone, to rake the leaves? Round to the nearest tenth of an hour.

Algebra
A farmer has 260 feet of fencing to make a rectangular corral. What dimensions will make a corral with the maximum area? What is the maximum area possible? Thanks.

Science
Definition of Critical Thinking The first reading contained the following definition of critical thinking: According to the article, Critical Thinking as Defined by the National Council for Excellence in Critical Thinking, Critical thinking is the intellectually disciplined ...

Science
Eight Elements of Thought and Reasoning There are eight elements of thought in reasoning. We often use more than one element at the same time. For example, your Point of View includes Assumptions. Therefore, we can assume that these elements are two aspects of the same thing. ...

math
When three times a number is subtracted from 1414?, the result is 22 plus the number. What is the? number?

S.S
B

S.S
Hey, Ms.Sue im still need help is it C then?

S.S
Why is James Madison considered to be the father of the Constitution? A. His ideas about democratic government influenced the writing of the Constitution B. He wrote the Declaration of Independence.**** C. He wrote the Anti-Federalist Papers, protecting the rights of the ...

Math
Hundred.... A plane flew an estimated distance of 800 kilometers. The greatest distance the plane could have flown is..... Kilometres