Tuesday

July 29, 2014

July 29, 2014

Total # Posts: 324

**Physics**

The light ray strikes the hypotenuse of the prism at an angle of incidence greater than the critical angle. Find the angle phi of the ray as it leaves the base of the prism. The incident ray is perpendicular to the left side of the prism. (The index of refraction of the prism ...

**Physics**

A battery with an emf of 10.3 V and internal resistance of 1.03 Ω carries a positive current of 0.550 A from its negative terminal to its positive terminal. (a) How long is required for 1.05 C of charge to pass through the battery? t = Q/I = (1.05)/(.550) = 1.909sec (b) B...

**Physics**

The Leyden jar, invented by chance in 1746, was one of the earliest types of capacitors (see the figure below), made by covering the inner and outer surfaces of a glass jar with conducting layers (for example, aluminum foil). It is a good approximation to treat the Leyden jar ...

**Physics**

Two point charges q1 = +5.6 10-8 C and q2 = -5.7 10-8 C. |-----q2 | | | q1----A----------B from the q2 to A is 10cm from the q1 to A is 5cm from A to B is 10 cm (a) Find the potential at A. (b) Find the potential at B. (c) Find the potential difference.

**Physics**

Ei = 3.11 MeV Ei = Ef Ef = kqQ/r => r = kqQ/Ef k = 8.99e09 Nm^s/C e = 1.6e-19 C 1MeV = 1.6e-19 C r = 7.3076e-14 m

**Physics**

In 1910 Rutherford performed a classic experiment in which he directed a beam of alpha particles at a thin gold foil. He unexpectedly observed a few of the particles scattered almost directly backward. This result was not consistent with then current models of atomic structur...

**american history**

For revolutionaries like sam adams. the term embraced a way of life a core ideology and an uncompromising commitmentto liberty and equality

**Math**

Need help on how to solve this problem.. Five cards are chosen from a deck of playing cards and put into a pile. Three of the cards are red and 2 of the cards are black. A second pile is made using 2 red cards and b black cards. One card from each pile is chosen randomly. The ...

**Math**

I know when you decrease the height of a cone by half that the volume decreases by half from plugging in the numbers in the formula. However, I don't how to explain in words why a decrease in height by half results in a decrease in the volume by half. Thanks..

**Language Arts**

In the sentence, "If you keep talking to me, I can't finish." would "to me" be a prepositional phrase? Thanks...

**Language Arts**

Need help on the sentence below. Can't decide if it is complex or compound. I know if it didn't have the "and" it would be complex but the "and" is throwing me off. "They listened to many American recordings, and then they added new ideas to th...

**Math**

Need help on the problem below with 4 coordinate points. "compute the round trip distance from your house (-2,5), then to your friends house (8,-1), to your uncle's house (2,-1), and then back to your house (-2,5) Thanks....

**technology**

Need help on the question below. I have read all about all 3 laws but still don't understand if this would be 1st or 2nd law. "A ball is rolling in a straight line on a hardwood floor. A cat hits it from the right, so the ball rolls left. Which Law of Motion is this? ...

**Social Studies**

Need help figuring out what 3 parts they are talking about in the question: List the 3 parts of the Containment Policy. Thanks...

**Language Arts**

Is the sentence below compound or compound complex? (I wasn't sure if "than I do" is a subordinate clause) Tanya drives better than I do, but I can swim faster? Thanks...

**Language Arts**

In the sentence: You can wallpaper the room yourself. Would this sentence have 2 verbs -- can, wallpaper? Thanks...

**Lang. Arts**

In the sentence, "She is interested in space exploration." Is the verb just "is" or is it "is interested"? Thanks...

**Social Studies**

Need help on this one. Trying to decide between a and b. Sarah wants to invest in capital goods in order to increase the capacity of her Internet Café. Which of the following would qualify as a capital good? a. bulldozer b. New computers c. hammer d. airplane

**Math/fractions**

Ben played 4/7 hours in the yard before dinner after dinner he played for 5/7 more hour. How many total hours did he play?

**Math**

need help on this one... 8^3 * 0^-1 Thanks...

**stats**

A researcher conducted an experiment on the effects of a new “drug” on depression. The researcher had a control group that received nothing, a placebo group and an experimental group that received the “drug”. A depression inventory that provided a measure o...

**physics**

A golf ball with a mass of 48.0 g can be blasted from rest to a speed of 69.4 m/s during impact with a club head. Assume that the impact lasts only about 1.010 ms. Calculate the change in momentum of the ball. Calculate the average force applied.

**Lang. Arts**

I'm having trouble deciding on whether the verb in each sentence below is action or mental. 1. They decided on a menu for dinner. 2. The team scored its third touchdown in the fourth quarter. Thanks...

**Physics**

So if I did my calculation right distance should equal 37 times 43 (36+7) which would equal 1591. Correct?

**Physics**

A motorist travels at a constant speed of 37.0 m/s through a school zone, exceeding the posted speed limit. A policeman waits 7.0 s before giving chase at an acceleration of 3.2 m/s2. I have solved that it will take 36 seconds for the cop to catch up to the car. However, I am ...

**Lang Arts**

Need help determining if the word became is used as an action or linking verb in the sentence: Two years later my uncle became a judge. Thanks..

**Math**

A toothpaste company did a survey at the mall. They found that 42.5% of those surveyed brushed their teeth twice a day. Which random numbers would you generate on a computer spreadsheet to simulate the survey? a. random integers from 425 to 1000 b. random integers from 1 to 10...

**math**

She buys 60 candy bars (5 x 12). Sells half (30 bars) for $10 (30/3) and the other half (30 bars) for $15 (30/2). She makes a total of $25. Subtract what she paid for the original candy bars ($12) from what she made ($25). Profit of $13.

**MATH**

Need help on the question below. A cat has a litter of 5 kittens. Which simulation could be used to determine the probability that exactly 3 kittens will be female? a. tossing 5 coins b. spinning a spinner with 5 equal parts c. using a random integers 1 to 5 d. rolling a 5 on ...

**Math**

Need help on this one.... Your town is building a circular ice rink with a diameter of 100 feet. Around the ice rink will be a walkway that is 10 feet wide. What is the approximate area of the walkway? Thanks...

**Math**

Need help on this one. You have a spinner numbered 1 through 8. What is the probability of spinning a factor of 4 and a multiple of 2? I know the first part would be 3/8 * _ but them I'm not sure for the second fraction if it would be 4/8 or 2/8. Thanks

**Math**

Need help on the question below. A pool has a diameter of 12 ft. There is a sidewalk that extends 3 ft out from the side of the pool. How many feet of fencing will be needed to go around the sidewalk? Thanks...

**math**

I put the wrong angle measure on my earlier question. It should have been... How many different triangles, if any, can be drawn with on 20 degree angle, one 45 degree angle, and one 115 degree angle. Thanks....

**Math**

Need help on the question below. How many different triangles, if any, can be drawn with on 20 degree angle, one 45 degree angle, and one 155 degree angle. Thanks....

**Math**

To Reiny: Hi, thank you for your time Reiny and your info. I am so sorry but on the first one I accidentally put 0 where I should have put =9. In other words, the first equation should have said (9n+1)squared =9. Really sorry to have taken up your time with the wrong equation,...

**Math**

Hi, thank you for your time Reiny and your info. I am so sorry but on the first one I accidentally put 0 where I should have put =9. In other words, the first equation should have said (9n+1)squared =9. Really sorry to have taken up your time with the wrong equation, but if yo...

**Math**

The following are the last two problems on my test review. I am trying to study for a test. This is not my homework. I am not expecting anyone to do my homework for me. I just need to get the answers to be able to study and if you can help, I would really really appreciate it!...

**Math**

Need help on the problem below. Tommy drew a triangle. Which information will enable you to draw a triangle that is congruent to Tommy's triangle? a. 2 given sides b. 2 given angles c. 2 given sides and 1 given angle d. 3 given angles Thanks....

**Math**

Need help with how to work the problem below. The answer key says the answer is 12,700 mi squared but I don't know how they got that. "The athletic dept. at Pi High School is planning a circular track 400 m long. The area inside the track will be planted with sod. Abo...

**Math**

I need help on how to work the problem below. The teacher said the answer is 11, but I don't understand how you get there. "The Big Screamer Coaster carries 92 people altogether. Some if its cars carry 4 passengers,and the rest carry 6 passengers. There are 3 less 6 p...

**Language Arts**

if you say, "The book is on top of the big slide." would "on top of" be a compound preposition or is on and of two different prepositions? Thanks...

**Lang ARts**

I to choose between the word indictment and verdict for the sentence below. I was given a sheet with the definition for both but neither seems to fit. The __________ revealed that the man was guilty and should go to jail for three years.

**math**

Kate is at a T-shirt sale where she can buy one and get a second one for 30% off. She wants to buy two T-shirts listed at $19 each. How much will she pay? A)$13.30 B)$24.70 C)$32.30

**7th grade Math**

If there is a population of 800 deer what would be a good sample size and why.

**Math**

Our teacher handed out handfuls of m&ms to each student in class. We were divided into 4 groups of 5 each. We had to count the colors of each of our handfuls of m&ms. Would this be considered a random sample? why or why not? I know the definition of random sample but I don'...

**social studies**

Having trouble on this question. Which form of government gives independent rights and policy making decisions to smaller regions (like states or provinces) of the country which cannot be overridden by the main government. The choices are unitary, confederation, or federal. I ...

**Math**

Need help on if the sample given is random or not random. The first 50 nurses at a nursing convention write their names on slips of paper and place them in a drawing box. After the box is shaken, 20 names are pulled from the box and each person chosen completes a survey about ...

**Math**

I DO NOT understand this at all and I worked on it and came up with answers but they were wrong?? Ned’s Sheds purchases building materials from Timbertown Lumber for $3,700 with terms of 4/15, n/30. The invoice is dated October 17. Ned’s decides to send in a $2,000 p...

**Math**

I DO NOT understand this at all and I worked on it and came up with answers but they were wrong?? Ned’s Sheds purchases building materials from Timbertown Lumber for $3,700 with terms of 4/15, n/30. The invoice is dated October 17. Ned’s decides to send in a $2,000 p...

**Science**

Need help with what a cell is like or not like and what metabolism is like or not like. Am only allowed to use one word.

**Math**

trying to decide between parameter and statistic for the 2 questions below. I think it is statistic for both but not sure. 1. A local newspaper conducted a survey last week. Of the 2300 subscribers, 1276 responded. Based on the survey, the editor concludes that 95% of the news...

**Science**

Need help coming up with something that Life Science is "like" or "not like". I know it is the study of living things but not sure what word to say it is like or not like. Thanks.

**Math**

Need help on writing an equation. the question is let H represent the stack height. Write an equation that represents the height of a stack of medium lampshades in terms of the number of lampshades, s, in the stack. # of lamp shades stack height med 1 8 2 10.5 3 13 4 15.5 5 18...

**college trig**

find the radius of a pulley if rotating the pulley 108.03 degrees raises the pulley 37.3mm

**algebra**

An airplane climbs at a rate of 66.8 ft per min. It descends at twice the rate it climbs. Assuming it descends at a constant rate, how many ft. Will the airplane descend in 30 min.?

**math**

The answer to the first question is 10/15. Unsure of the second

**Math**

Want to make sure I'm doing this problem correctly. It says, "A restaurant bill is $84.97. Estimate a 20% tip." Would I do $85 times .20 for a tip of $17.00? Thanks..

**Language Arts**

Need help on the question below. On our hike, the rain (fell steady or fell steadily) for more than an hour. Thanks...

**Math**

Need help setting up the problem: If you deposited $800 into a savings account with an interest rate of 3.8%, what will be your balance at the end of 1 year. I was thinking the overall answer is 830.40 but you are supposed to use a percent equation and a proportion equation. I...

**Math**

using the expression area of a circle = 3.14r^2 detemine how much of the floor in Barbara's room will be covered by a rug with a diameter of 8 ft. I know the answer is 50.24 ft but I wasn't sure if I'm supposed to write it as 50.24 ft. or 50.24 ft^2 thanks....

**Math**

Having trouble figuring out this problem. I'm supposed to write the inequality for this problem. Vijay wans to keep the cost per person of his party under $15. The Party Place charges a flat fee of $250 for an all inclusive party. Let g represent the number of guests, incl...

**Science**

Need help on this question: Which telescopes out of the ones below collects and focuses on Gamma Rays? Arecibo Chandra Hubble Spitzer Thanks....

**6th grade Math**

I need help on the problem below. The instructions say to "factor the expression" and the expression is: -.2x^2 + 80x -6000. Thanks

**Math**

Need help with one more question. Which best describes a statistical question? a. a question that contains numbers b. a question about numbers c. a question about designing an experiment d. a question about a population or sample. I was thinking it might be D. Thanks...

**Math**

Need help on the question below. Which of the following questions is best suited for an experiment? a. what conditions do peppers need to grow? b. do peppers grow taller with 10ml of daily watering or with 15ml of daily watering c. what conditions do plants need to grow? d. ho...

**Math**

Need help on the question below. Bill exercises daily by walking on a treadmill. He sets the machine so that he will walk at a rate of 3.6 miles per hour. T = time in hours; D = distance in miles. What are the independent and dependent variables? Thanks..

**Math**

Need help on this question: There are 32 sixth graders and 44 seventh graders in the video gaming club. Which ration is greatest? a. the ration of 6th graders to 7th graders b. the ration of 6th graders to club memebers c. the ratio of club members to sixth graders d. the rati...

**Trigonometry**

If cos(a)=1/2 and sin(b)=2/3, find sin(a+b), if 1) Both angles are acute; Answer: (sqrt(15)+2)/6 ii) a is an acute angle and pi/2 < b < pi; Answer: (2-sqrt(15))/6 2. Find the exact value of the six trigonometric functions of 13pi/12. Partial answer: cos(13pi/12)=-(sqrt(6...

**Math**

need help on this review question. Determine each sum by writing an equivalent numberical expression using Commutative and Associate properties. 3 + 9 + 7 + 6 For commutative could you just put 3 + 7+ 9 + 6? I'm confused on what do do for associative since there are no par...

**Math**

Not sure how far to take this problem down. The directions say to simplify using the distributive property. 4(x + 1) -2 divided by 2. Would it be 4x +4 -2 divided by 2 or 4x + 2 divided by 2 or 2x +1? Thanks..

**Math**

One week a company has a loss of $216.70. The next week they have a gain of $323.83. What is the net gain between the 2 wks?

**math**

How do you write and absolute value statement describing the situation of something going down in value from $900 to $700? Thanks..

**Math**

I'm having trouble on the 2nd part of the question below. The value of a 1962 Mickey Mantle baseball card went from $900 to $700. a. Write an integer to describe the change in value in the card. ( I know this would be -200) b. Use the abolute value of the integer to write ...

**Language Arts**

Need help figuring out which is the correct way to write the sentence. 1. In the summer we were going to the beach, and had a flat tire. 2. In the summer, when we were going to the beach, we had a flat tire. Thanks....

**Math**

Is the opposite of 0 still 0 or does 0 have no opposite? Thanks...

**Math**

Need help on the question below. Which number belongs to the set of rational numbers but does not belong to the set of whole numbers? a. -1 b. 0 c. 1 d. 2 Thanks...

**Trigonometry**

using csc = 3.75, solve for sides: a= 3 b= ? c= ? and the remaining five trigonometric functions: sin= (1/3.75) cos= ? tan= ? sec= ? cot= ? *b is not 1; and c is not 3.75

**Science**

Need help on the question below... Which is the warmest climate zone? A. Arctic Zone B. Temperate Zone C. Tropical Zone D. Intermediate Zone Thanks :)

**Language Arts**

I have the sentence...When I get home from school,I'm going to take a nap. I am supposed to underline the subjects and verbs. I know in the first part the subject is I and the verb is get. On the second part the subject is I. I'm not sure on the verb though. Is it am g...

**Chemistry**

A sample of nitrogen containing 1.5x10^23 molecules has the same number of molecules as a sample containing A. 1.0 mole of H2 B. 2.0 moles of He C. 0.25 mole of O2 D. 0.50 mole of Ne

**Chemistry**

A sample of nitrogen containing 1.5x10^23 molecules has the same number of molecules as a sample containing A. 1.0 mole of H2 B. 2.0 moles of He C. 0.25 mole of O2 D. 0.50 mole of Ne

**Science **

Need help on the question below...I know it is not C or D The formation of metamorphic rocks depends on all of the following except a. the composition of parent rocks b. Earth's magnetic field c. temperature d. pressure Thanks

**Language Arts**

Not sure between 2 answers on the question below. What is the BEST way to write this sentence correctly? "David went to the store and bought some bread then he took the long way home." a. David went to the store and bought some bread. Then he took the long way home. ...

**Math**

having trouble figuring out this problem. During the first 4 wks of school, a cafeteria worker made more than 840 tacos. She made the same number of tacos each week. Which inequality best represents t, the number of tacos she made during 1 week. a. t > 410 b. t < 410 c. ...

**Social Studies**

I know the higher the literacy rate the higher the GDP and standard of living in a country. I'm having trouble with a study question though on how can a country increase their literacy rate. Thanks.

**Social Studies**

I need some help determing what ocean Australia is located in. The question on my study guide says, "Australia is located in the southeast __________ Ocean. I see it is surrounded by the Southern Ocean, Indian Ocean, and Pacific Ocean. I'm not sure which one to pick. ...

**Social Studies**

I need some help determing what ocean Australia is located in. The question on my study guide says, "Australia is located in the southeast __________ Ocean. I see it is surrounded by the Southern Ocean, Indian Ocean, and Pacific Ocean. I'm not sure which one to pick. ...

**Math**

I'm confused on how to answer a rotation question. If I have a picture and it rotates 270 degrees to where the top of the picture is now to the left of the page did the figure rotate 270 degrees to the right or left? Since it is clockwise I was thinkng to the right but the...

**calculus**

A brick becomes dislodged from the top of a state building (at a height of 1290 feet) and falls to the sidewalk below. (a) Write the position, velocity, and acceleration functions of the brick. s(t) = v(t) = a(t) = (b) How long does it take the brick to hit the sidewalk? (c) H...

**calculus**

Find the derivative of the function. f(x) = 9/((7x^2-12)^(1/2))

**chemistry**

Some spacecrafts use hydrazine (N2H4) as fuel and is burned according to the following reaction: N2H4(l)+N2O4(g)=>2 N2O(g)+2 H2O(g) Calculate the DHrxn° for this reaction using the standard enthalpies of formation from Appendix IIB. Calculate your answer to 4 sig figs

**Math**

I am working on a graphing exercise where I had to make a picture using ordered pairs and graph it. Then I had to graph the inverse coordinates. Finally it said to make a different graph this time using the "negative of the ordered pair". I don't understand what ...

**chemistry**

A 115 g piece of metal, initially at 60.0 °C, is submerged into 100.0 g of water at 25.0 °C. At thermal equilibrium, this mixture had a final temperature of 27.0 °C. The specific heat capacity of water is 4.18 (J/g°C). Use this information to determine the spec...

**Physics**

An automobile is brought to a stop by applying friction brakes to the wheels. The brakes get hot; their thermal energy is increased. The decrease in kinetic of the car is equal to the increase in thermal energy of the brakes. According to the first law of thermodynamics, the b...

**math**

18-10x<-22

**college algebra 1111**

solve. 2z^2-7=-48

**math**

zoe, minh, and jake sold some tickets for a school fundraiser. each ticket cost $2. zoe sold 1/2 of the tickets. minh and jake sold the remaining tickets in the ratio 1:3. if zoe sold 36 more tickets than minh, how much money did the 3 students collect altogether?

**math**

a manager bought some stamps. she gave 1/3 of them to a cashier and 1/5 of them to her secretary. if the secretary received 40 fewer stamps than the cashier, how many stamps did the cashier receive?

**Chem**

What mass of protons would be required to just neutralize the charge of 3.5 of electrons?

**Chem**

What mass of protons would be required to just neutralize the charge of 3.5 of electrons?