# Posts by Sabrina

Total # Posts: 553

**OPTICS/PHYSICS-REALLY DO NOT UNDERSTAND THIS!**

thank you what would the dimension of shadow be?

**OPTICS/PHYSICS-REALLY DO NOT UNDERSTAND THIS!**

thank you would what the nature of the shadow be if the point of source of light is replaced by a luminous disc of diameter 5 cm, whose centre lies directly above the centre of the card?

**OPTICS/PHYSICS-REALLY DO NOT UNDERSTAND THIS!**

WHAT DOES PI STAND FOR?

**OPTICS/PHYSICS-REALLY DO NOT UNDERSTAND THIS!**

THANK YOU!

**OPTICS/PHYSICS-REALLY DO NOT UNDERSTAND THIS!**

A POINT SOURCE OF LIGHT IS PLACED 50 CM ABOVE A CIRCULAR CARD OF DIAMETER 5CM, THE SOURCE BEING DIRECTLY ABOVE THE CENTRE OF THE CARD. WHAT IS THE AREA OF THE SHADOW ON THE FLOOR 70 CM BELOW THE CARD?

**OPTICS**

PLEASE HELP! A POINT SOURCE OF LIGHT IS PLACED 50 CM ABOVE A CIRCULAR CARD OF DIAMETER 5CM, THE SOURCE BEING DIRECTLY ABOVE THE CENTRE OF THE CARD. WHAT IS THE AREA OF THE SHADOW ON THE FLOOR 70 CM BELOW THE CARD?

**maths/physics**

PLEASE HELP! A POINT SOURCE OF LIGHT IS PLACED 50 CM ABOVE A CIRCULAR CARD OF DIAMETER 5CM, THE SOURCE BEING DIRECTLY ABOVE THE CENTRE OF THE CARD. WHAT IS THE AREA OF THE SHADOW ON THE FLOOR 70 CM BELOW THE CARD?

**maths/physics**

PLEASE HELP! A POINT SOURCE OF LIGHT IS PLACED 50 CM ABOVE A CIRCULAR CARD OF DIAMETER 5CM, THE SOURCE BEING DIRECTLY ABOVE THE CENTRE OF THE CARD. WHAT IS THE AREA OF THE SHADOW ON THE FLOOR 70 CM BELOW THE CARD?

**science**

980

**nonfiction**

D. Know thyself

**chemistry please help me please!!!**

When one student did this experiment, he started with 19.5 mL of 0.118 M monoprotic acid. The endpoint was reached when 17 mL of base was added. What was the concentration of the base?

**Geometry**

AC and AE are common external tangents of circle G and circle D. FE = 26, GF = 5, and AG =13. What is the measure of AC?

**Language Arts**

Thanks

**Language Arts**

Who is Anmol? and I don't know

**Language Arts**

Seemingly virtuous; showing religiuos devotion P _ O _ S

**Language Arts**

uuummmm okay

**Language Arts**

Thanks...so you're who Ms.Sue was talking about?

**Language Arts**

Who is Anmol? and I don't know

**Language Arts**

Easy to manage or discipline D _ _ _ L _

**algebra**

factoring completely: 36x^2 + 60x +25

**Physics**

First, you want to find the maximum height. At the maximum height, you know the velocity must be 0. vi = initial velocity vy(t) = vertical velocity t1 = first time (3 s) SO: vy(t1) = -g*t1 + vi*sinθ 0 = -g*t1 + vi*sinθ vi*sinθ = g*t1 Now, it's just a matter ...

**6th Grade Math**

PLEASE HELP ME!!!!! I need to answer this equation: 9/2m-8=-5.5+4m I need it answer in a way like this: Ex: 9+5k=45+2k 0peration S 9 5k=36+2k S 2k 45+2k D 3 k=12

**statistics**

A professor informs her class that a test is very difficult, but the grades will be curved. Scores for the test are normally distributed with a mean of 25 and a standards deviation of 5. If she curves the grades by adding 50 to each grade, What is the new mean? What is the new...

**Math😒**

How do you find the answer to 3.4 - 0.972

**statistics**

Thank you.. It is 0.1008..

**statistics**

A history professor finds that when he schedules an office hour at the 1030 am time slot an average of 3 students arrive. Use the poisson distribution to find the probability that in a randomly selected office hour in the 1030 am time slot exactly 5 students will arrive.

**statistics**

A test has a mean of 104 and a standard deviation of 16. We want to be 98% certain that we are within 4 points of the true mean. Determine the sample size.

**statistics**

I thought that was it. It just seemed to easy. Thanks

**calculus**

malachi has three tvs of: 25",27",32". what the average size of malachi tvs?

**FLORIDA STUDIES WEEKLY**

WHATS THE ANSWER TO #7 DOWN

**Chemistry**

-1045

**statistics**

A person can order a new car with a choice of 9 possible colors, with or without ac, with or without heated seats, with it without anti lock breaks, with or without power windows and with or without a CD player. How many different ways can a new car be ordered with these ...

**Chemistry**

If a sugar cube measured 20cm by 20cm how much surface area would be exposed to the solvent(water)

**Living Environment(please check answers)**

ya mom

**math**

a map of the moon has a scale of 1cm:25km. On this map the diameter of the Copernicus crater is about 3.7 cm. To the nearest kilometer, what is the actual diameter of the crater?

**math**

express using a positive exponent: c^-5

**Physics (Mechanics)**

Marie shoots an arrow vertically upward at a sandhill crane. If the arrow travels to a maximum height of 99.5 meters, calculate how fast it was shot. And, for how much time was Marie's arrow in the air?

**com172**

Review the following passage and paraphrase it in the following box. Use the reference to create an appropriate APA-formatted in-text citation. Additionally, include one direct quotation. One of the most valuable skills a student can develop is focus. Focus is the ability to ...

**physics**

Calculate the speed (in m/s) of a skateboarder who accelerates from rest for 4 seconds down a ramp at an acceleration of 3 m/s2.

**Math**

i don't no

**Physics**

Let: d1 = distance from drop to top of window d2 = distance from drop to bottom of window t1 = time from ball drop to top of window t2 = time from ball drop to bottom of window vi = initial velocity g = acceleration due to gravity Knowing the equation (d = vi*t + (a*t^2)/2) d1...

**Algebra**

I'm not sure how to get started! Please help! y=-2x^2-12x+2 Find the vertex, y intercept and x intercept

**English 10**

In the autobiographical selections "Hair" and "It Can't Be Helped," the authors describe how racial prejudice affected their early lives. Identify the key event described in each of the selections. Then explain how each author responded to the event at ...

**MAth grade 8**

i don't now wtf so get over it figer it out

**math**

Using the breaking apart method what is the best way to multiply 8 by 7

**business math**

Is it more economical to buy an automobile for $29,000 cash or to pay $4,500 down and $3,000 at the end of each quarter for 2 years, if the money is worth 8% compounded quarterly? What is the cash equivalent savings by picking the better plan?

**Finance**

Is it more economical to buy an automobile for $29,000 cash or to pay $4,500 down and $3,000 at the end of each quarter for 2 years, if the money is worth 8% compounded quarterly? what is the cash equivalent savings by picking the better plan?

**Finance**

Is it more economical to buy an automobile for $29,000 cash or to pay $4,500 down and $3,000 at the end of each quarter for 2 years, if the money is worth 8% compounded quarterly?

**Physics**

An aircraft has a landing velocity of 50 ms-1 and decelerates uniformly at 10 ms-2Calculate: (a) the time taken to reach 15 ms-1 (b) the distance travelled during this time (c) the velocity of the car when it was 100 m from the start point

**engineering**

How has hydraulic engineering altered local and regional environments?

**self reflective essay**

I want to know can I write about myself in a self reflective essay ,,here is my thesis statement do you think it is ok? In this paper I will argue the life of a child being born in a divorced family was it easier or was it very hard?

**geometry**

draw a right triangle for which both acute angles are congruent what is the measure size of the two acute angles.

**math**

Using Torricelli's Principle, it can be shown that the depth d of a liquid in a bottle with a hole of area 0.5 cm2 in its side can be approximated by d = 0.0034t2 − 0.52518t + 20, where t is the time since a stopper was removed from the hole. When will the depth be ...

**math**

The height of a projectile fired upward is given by the formula s = v0t − 16t2, where s is the height in feet, v0 is the initial velocity, and t is the time in seconds. Find the time for a projectile to reach a height of 96 ft if it has an initial velocity of 128 ft/s. ...

**math**

A model rocket is launched with an initial velocity of 250 ft/s. The height, h, in feet, of the rocket t seconds after the launch is given by h = −16t2 + 250t. How many seconds after launch will the rocket be 730 ft above the ground? Round to the nearest hundredth of a ...

**math**

A model rocket is launched with an initial velocity of 250 ft/s. The height, h, in feet, of the rocket t seconds after the launch is given by h = −16t2 + 250t. How many seconds after launch will the rocket be 730 ft above the ground? Round to the nearest hundredth of a ...

**social psychology**

Women have lower self esteem than men. Discuss how personal attitudes can affect or promote self-esteem, citing two (2) specific examples for each gender

**social psychology**

yes ms.sue i would like you to like me with it thank you

**social psychology**

3. Perceiving yourself to be a target of discrimination and prejudice can affect you negatively. Citing two (2) examples of each, explain how this may happen 4. Images of a new self can motivate us to change. Identify a “Desired Possible Self” and describe the ...

**social psychology**

Women have lower self esteem than men. Discuss how personal attitudes can affect or promote self-esteem, citing two (2) specific examples for each gender

**EMT-Basic**

A.

**History**

2. What was the Confucian definition of a gentleman? Why did Confucianism place so much emphasis on manners and ceremony?

**Math**

Which theorem or postulate states that if the hypotenuse and an acute angle of one right triangle are congruent to the hypotenuse and corresponding acute angle of another right triangle, then the triangles are congruent?

**Math**

The segment that bisects an angle of the triangle and has one endpoint at a vertex of the triangle and the other endpoint at another point on the triangle is called the _________. The segment that has one endpoint at one of the vertices of a triangle and its other endpoint on...

**algebra**

How many ways can the offices of president, vice-president, treasurer, secretary, parliamentarian, and representative be filled from a class of 30 students?

**algebra**

Yolanda's yogurt house offers 3 different kinds of yogurt and 13 different kinds of toppings. How many different yogurt and topping combinations are possible?

**elementary math**

Sabino took the ACT in 2003 and received a composite score of 22. If the mean and standard deviation for that year were, respectively, 20.8 and 4.8, what percent of all of the students who took the exams scored better than him?

**chemistry**

How many grams of sodium cyanide would be required to make 55 grams of sodium sulfate?

**biology pleaseehelp!**

In order to produce many copies of a protein fast, the cell uses A. DNA replication. B. intron self-splicing. C. single-unit ribosomes for high speed translation. D. codon-anticodon reciprocal duplication. E. many RNA polymerase molecules to produce mRNA transcripts at the ...

**Grade 12 Biology**

If a life-form has six different bases-ABCDEFG. the percentage composition of A,B and C is same as EFG. Hypothesis the structure of the nucleic acid. I TRIED the search engine but didn't help, please help!

**Grade 12 Bio Please try to help me**

If a life-form has six different bases-ABCDEFG. the percentage composition of A,B and C is same as EFG. Hypothesis the structure of the nucleic acid.

**math**

Jim wants to deposit money in an account to save for a new stereo system in two years. He wants to have $4,000 available at the time. The following rates are available to him: 6.2% simple interest 6.1% compounded annually 5.58% compounded semiannually 5.75% compounded ...

**social studies**

why may a historian call Niccolo Machiavelli "The firsmodern Italian

**american history**

What Civil War general replaced Hooker as commander of the army of the Potomac in June of 1863?

**Human Resources Management**

Sekect two aspects of a performance appraisal from the list below. Explain what each aspect is. State the effects on employees and employers if the aspects were not addressed. Strategic Relevance Criterion deficiency Criterion contamination Reliability Compliance with the law ...

**math 6**

What is the volume of trapezoid and area?

**biology**

all test crosses are back cross. but all back crosses are not test cross. justify the statment

**Biology**

thank u soo much :)

**Biology**

why is there no production of ATP when detergent is treated in a test tube with mitochondria? in Aerobic and anaerobic respiration what is the final metabolic breakdown of molecule? 1 pyruvic acid 2 acetyl coenzyme A 3 citric acid 4 reduced coenzyme FADH2 5) ATP PLEASSEEEEEEEE...

**BIOO**

why is there no production of ATP when detergent is treated in a test tube with mitochondria? in Aerobic and anaerobic respiration what is the final metabolic breakdown of molecule? 1 pyruvic acid 2 acetyl coenzyme A 3 citric acid 4 reduced coenzyme FADH2 5) ATP PLEASSEEEEEEEE...

**BIOO pleasee help u guys are angellss!!!**

why is there no production of ATP when detergent is treated in a test tube with mitochondria? in Aerobic and anaerobic respiration what is the final metabolic breakdown of molecule? 1 pyruvic acid 2 acetyl coenzyme A 3 citric acid 4 reduced coenzyme FADH2 5) ATP PLEASSEEEEEEEE...

**History**

What is the role of the United States in the emerging global community?

**Chemistry**

If the surface area of a liquid is increased will the rate of evaporation increase?

**8th grade math**

Point A=(5,-2) was translated to point A'=(-3,6). Describe the translation.

**fifth grade math**

40%

**business math**

plug in 6.4 as the % and $1,000 as the deposit

**Bio**

Is protein an unsaturated fat?

**math factoring**

a-√2/a-4 how to rationalize it? thank you so much

**Physical Science**

Who discovered Respiration?..Ever single time i google it, it comes up as cellular respiration..i need breathing respiration..please help me!!!!! ~;D~

**Math trignometry**

how can you condense these cos^3x* cos2x^2 cos^3x+ cos2x^2 cos^3x- cos2x^2 Thanks a lot :)

**your preciouss helpp please**

how can you condense these cos^3x* cos2x^2 cos^3x+ cos2x^2 cos^3x- cos2x^2 Thank you soo much

**physic**

4. If the same two dust particles have -1.0 x 10-10 C of charge on one, and +3.2 C x 10-10 C on the other, what is the force between them now? If the force is pushing them apart, show it as a positive number and if it is attracting them together, show it as a negative number. ...

**physic**

3. I have two identical dust particles. They are spheres with diameters of 0.0001 meter (about the same as a hair). They have the same density as water so they each have a mass of 10-12 kg. If each dust particle goes through a discharge so that 2.40 „e 10-10 C of ...

**physic**

2. Rank the following in the order of how much of a corona discharge they would produce, from highest to least (e.g., if D is highest, then A, C, and B is lowest. enter DACB). Explain your response. a. a large round metal ball hooked to a high voltage battery b. a sharp metal ...

**math help please!!**

determine the point of intersection y=logbase 10(x-2) and y=1-logbase 10(x+1)

**math log PLEAseee helpp pretty please!!!**

its wrong you wrote 10^(y-1)+1=10^y +2 its supposed to be 10^(y-1)-1=10^y +2 THE ANSWER IS APPARENTLY 2, log base 10 2

**math log PLEAseee helpp pretty please!!!**

you are THE BESTT!!

**math log PLEAseee helpp pretty please!!!**

determine the point of intersection y=logbase 10(x-2) and y=1-logbase 10(x+1)

**math**

how to covert y=2sin(4(x-pi/8)) to cos and y=cos3x+pi Thank you for your responses!!

**PLEASE HELP!!!!**

Thank you