Posts by anna

Total # Posts: 2,686

Math - vectors
For what value of t are these two vectors parallel? a) r = 4i + tj and s = 14i - 12j What I Know: vectors are parallel if one is a scalar multiple of the other. I need to find a way that r and s relate by finding what number you can multiply r by to equal s. What I Don't ...

Math
If a piece of equipment cost 21,000 new and the equipment was worth 75% of its new value after 4 years what is its salvage value after 10 years

Math
If a piece of equipment cost 21,000 new and the equipment was worth 75% of its new value after 4 years what is its salvage value after 10 years

Geometry
Point AC is parallel to Point DB at point O. DB and AC bisect each other. Triangle AOD IS CONGRUENT to triangle COB. PROVE.

math
" I am thinking of a number thrice my number minus 6 equals 66"

Math
Marian bought a 2 L bottle of fruit juice for 5.99 Isaac bought a 0.75 L bottle of the same juice for 2.95 Which was the better buy?Explain

French
Could someone who specializes in French help me to see if these are correctly written in the past tense. Thankyou!!! (: 1. J’ai passé mes vacances en Californie. I spent my vacation in California. 2 Nous sommes allé à la plage beaucoup. We went to the...

French
I need help with the correct translations in French (please check to make sure if I used past tense right or if it's not, suggest the appropriate change. 1. During the summer, I traveled to Baltimore, Maryland. - Pendant l'été , je suis allé &...

English
Which of the following sentences demonstrates a subject-verb-modifier pattern? A. Shelly served dinner after spending hours preparing a meal. B. Shelly, after spending hours preparing the meal, served dinner. C. After spending hours preparing the meal, Shelly served dinner. D...

Physics
I need to understand how to calculate the final 2 steps of this problem. Appreciate any help: For a circuit, consisting of a single battery and two light bulbs in parallel, what is the total resistance of the circuit if each light bulb has a resistance of 6.3 ohms? 1/Rt=1/R1+1...

Physics
Thanks. Pretty much what the photos in the book have, and what the professor said. Still don't understand. I appreciate your time.

Physics
The answer "use the right-hand rule" isn't working for my brain. I'd really like to understand how to answer the following: You can make an electromagnet by wrapping wire around a wire and connecting the ends to a battery. If the battery is connected so that ...

math
The angle of elevation to the top of a building is found to be 5 degrees from the ground at a distance of 4 miles from the base of the building. Find the height of the building to 4 decimal places.

Physics
Thanks, I'll keep checking with others for a formula. Appreciate your time.

Physics
I don't understand what formula to use for this question: Points A and B each have an electric potential of +9 V. How much work is required to take 1 mC of charge from A to B? Thank you

Physics
What is the electric field midway between an electron and a proton separated by 0.8 nm. Don't know what formula to use. Nothing on line is helping me get to the correct answer. Appreciate anyone's help. Thanks

Physics
Thanks. The link was blocked by my computer.

Physics
Thanks for letting me know that 3*10^8 is wrong. That's why my answer is wrong. So, will continue searching for what to use for c. Don't understand. Thanks again.

Physics
What is the wavelength of light in water if it has a frequency of 6.8 x 10^14 Hz? I don't know what formula to use and don't understand. I tried Lambda=c/v and got it wrong. Answer needs to be in nm. Thanks.

Physics
So for the 1st question, I answered Virtual, Erect, and Magnified. It is marked wrong. The 2nd question, I finally got Real, Inverted, and Reduced and it is marked correct. Still don't understand what to do about the first question. Thanks for trying to help me.

Physics
An object is located midway between the focal point and the center of a concave spherical mirror. Draw a ray diagram to locate its image. Is the image real or virtual, erect or inverted, magnified or reduced in size? Completely baffled by above question and the next question. ...

pre cal
Find the angle between the vectors u and v if u=i+4j and v=−i+2j.

pre cal
I've tried this and got - 0.9216353751380653 can you help me any further please?

pre cal
Find the angle between the vectors u and v if u = (-1,4) v = (3,-4) a. 155.93 b. 158.58 c. 158.13 d. 155.24 e. 157.17

Physics
6019 wrong 3325 wrong I can't afford any more wrong answers. Won't get any credit. Thanks again for your help. I'll try posting the question again and see if I can understand the formulas. I appreciate your time.

Physics
I'm still getting the wrong answer. I don't understand this at all. I tried re-posting in the hopes that someone can explain the formula so I can get the correct answer. Thanks very much!

Physics
A 95 gram piece of metal is heated to 98°C and placed into 200mL of water insulated at 20°C. If the equilibrium temperature is 27.20, find: The heat gained by the water. calories: _________ The specific heat of the metal. cal/(g°C): ________ Hint: 1 mL water has a ...

Physics
6,019.2 calories for the heat gained by water is incorrect. That has been my problem all along. Can't figure out the correct answer. Thanks, though.

Physics
A 95 gram piece of metal is heated to 98°C and placed into 200mL of water insulated at 20°C. If the equilibrium temperature is 27.20, find: The heat gained by the water. calories The specific heat of the metal. cal/(g°C) Hint: 1 mL water has a mass of 1 gram I have...

Physics
Thanks, that did it!

Physics
In calories 175 x .5 x 2 175 x 79.5 175 x 79.5 x 2 I know this is incorrect, but I can't figure out what is supposed to be multiplied. Thanks

Physics
thanks, still getting the wrong answer.

Physics
How much heat is required to convert 175 g of ice at -2°C to water at 2°C? I have no idea how to solve this. Nothing I've found in the book or on-line is helping. Can someone point me to how to solve? Thank you

Meths
Two cars travel to a place at 60 km/hr and 70 km/hr resp. The first car takes 11/2 hour more then the second car for the same journey find the length of the journey

Math 105
Suppose you are looking to buy a $10,000 face value 13-week T-bill. If you want to earn at least 3% annual interest, what is the most you should pay for the bill? Round your answer to the nearest penny.

physics
Correction. The Hour Hand is 2.31e-05 rev/s; the Minute Hand is 2.78e-4 rev/s. I've checked with 3 tutors and none of them have gotten an answer that works for the Second Hand rotational speed in rev/s. Thank you

physics
If an hour hand is .01667 rev/s, a minute hand is 2.78e-4 rev/s, what is the second hand rotation speed? I've tried everything and can't get a correct answer. Thank you

Physics
A 0.2kg toy car rolls down a ramp with a height of 0.7m. What is the speed of the car at the bottom of the ramp. At the bottom it hits a stationary car with a mass of .4 kg. The two cars have velcro bumpers and stick together. At what speed do the two cars move after the ...

Calculus
A box (with no lid) is to be constructed from a sheet of card board by cutting the squares from corners and folding up the sides. Suppose the original sheet of card board measures 16 inches by 16 inches. What would the size of the squares removed to maximize the volume of the ...

Physics
I'm really struggling trying to understand what formulas to use for the following: A satellite orbits the earth with a radius of 7000 km. (a) what is the acceleration of gravity at this distance? (b) what is the velocity of the satellite? (c) how long does it take the ...

Physics
Thank you

Physics
I'm really struggling trying to understand what formulas to use for the following: A satellite orbits the earth with a radius of 7000 km. (a) what is the acceleration of gravity at this distance? (b) what is the velocity of the satellite? (c) how long does it take the ...

Maths
The ratio of the number of adults and children during the performance is adults : children = 3:2 .For this performance find the ratio total cost of an adult tickets : total cost of a child tickets. give your answer in its simplest form

Physics
Thanks so much. Works perfectly!

Physics
I've figured out the first part that the v is 1.25 m/s, but even with that knowledge can't determine how to calculate the horizontal distance. Can someone help with a formula? You let a ball roll from rest from the top of a ramp sitting on a table. If the top of the ...

chem
a gas mixture is comprised of 32% oxygen and the rest is nitrogen. If the scuba tank is pressurized to a total pressure of 132 atm what are the partial pressures of the oxygen and nitrogen inside the tank? I'm having trouble understanding how to find partial pressures. Can...

chemistry
A 2.00 L flask is filled with propane gas (C3H8)at 1.00 atm and -15.0 Degrees Celsius. What is the mass of the propane in the flask?

Chemistry
How can I make 100ml 0f 2N of HCl? purity is 35% and density is given as 1.18 g/mL

ELA PLEASE CHECK ANSWERS!
"random" and "Asian Princess" are both correct.

Math
John?

Math
Ms. Sue??

Math
1st question: Which events are not independent? You toss three coins and get one head and one tail. You choose three different ice toppings for a sundae. You draw to colored pencils without replacement and get one red and yellow. You pull a yellow marble from a bag of marbles...

Check my french answer?
true

Check my french answer?
It is customary to greet someone on the street with "allô". False True

Chemistry
Sulfur trioxide can be produced by the reaction in the gaseous phase, sulphur dioxide with molecular oxygen in the presence of a catalyst. If 128 g branches of SO2 were placed in the presence of 16 grams of O2, that amount of SO3 will be theoretically formed?

World Geography
this is the main human activity that contributes to global warming massive dumping of pesticides into the oceans high demand and depletion of the world's oil supply burning of fossil fuels*** increase levels of chlorine poured into shorelines

Geography
a majority of the greenhouse gas emissions released into the atmosphere is composed of methane*** carbon dioxide oxygen nitrous oxide (my second guess)

Math120
5+6+9=20 5+6=11 11/20

Geography
I just put that as my answer and it was correct so...

Geography
which is not an impact of global warming on ecosystems population explosion among various species warmer weather causes some species to migrate out of their natural habitat in search of cooler temperatures certain species face extinction food supply increases***

math
Anyone please help me! Directions: Follow the instructions below to design a fair race for the new video game Animal Tracks. 1. Choose two animals with different speeds. You can choose from the chart that starts at the bottom of this page or do research to choose your own. (I ...

Chemistry
A current of 2 Amperes is past for 30minutes. Calculate the mass of sodium and the mass of copper deposited.

math
HOW should i start this im confused. The theater arts committee estimated that it would sell 200 tickets for its upcoming play. The committee actually sold 224 tickets. What was the percent error in the committee’s estimate? Round your answer to the nearest tenth of a ...

math
60/215= 28% is this correct?

math
Laketown had 215 inches of snowfall last year, but only 155 inches this year. What was the percent decrease in snowfall for Laketown to the nearest percent? A. 28% B. 39% C. 72% D. 139%

math
What is the value of x? x over 4 equals 14 over 16 x/4 = 14/16 x=3.5 ?!??

math
Raina is saving money to buy a game. So far she has saved $16 , which is one-fourth of the total cost of the game. How much does the game cost?

electricity and magnetism
a battery and two resistors R1 And R2 are connected in series . if R1 is 340ohms and the voltage across R2 is 39% of the battery voltage,find R2.

math
determine which ordered pair is a solution of y=2x-3.

World Geography
Which of the the following is the basis of the traditional Aborigine economy? farming industry mining hunting and gathering***

World Geography
Which geographic feature of Cook Island benefits the growth of crops fertile, volcanic soil*** dry climate proximity to the ocean infrequent sunlight supports the growth of shade plants

World Geography
Which natural recourse is not a common and highly important food source throughout the Pacific Islands bananas cattle pork*** taro root

World Geography
The discovery of _________ caused the creation of new Australian towns jewels and diamands*** bronze pottery gold and mineral deposits furs

World Geography
This geographic feature is the primary reason for a budding economy on Cook Island beautiful beaches and pleasant climates*** beautiful volcanoes tropical plants unique population of fish

World Geography
Islanders living in Beqa, Fiji lived primarily by hunting and eating meat*** by fishing and cultivating tara by gathering nuts for exports by eating plants

World Geography
During the late 18th and mid 19th centuries, Europeans and North Americans were attracted to nearby coastal waters due to potential economic gains from catching trout and cod fish catching seals and whales shipbuilding finding riches on unexplored islands***

English
The answers are 17. B 18. A 19. B 20. D 21. C

Math
Mai has a piece of cloth that is 8.35 meters long. How many 15 centimeter pieces can she cut from the cloth? How much will be left over?

algebra
why is f(x)=|x-5| not linear ??? and how can one figure out that it's not linear ???

algebra
what are the two requirements for a proportional relationship ????

physics
A 10kg block slides towards the 3kg moving block to create a totally inelastic head on collision. The 3kg block comes to a stop after the collision. 1. What speed must the 10kg block be moving at prior to the collision for this to occur? 2. Instead of sliding along a ...

physics
home / study / science / physics / questions and answers / a 10kg block slides towards the 3kg moving block ... Your question has been answered! Rate it below. Let us know if you got a helpful answer. Question A 10kg block slides towards the 3kg moving block to create a ...

physics
home / study / science / physics / questions and answers / a block of mass 3kg s sliding along the frictionless ... Question A block of mass 3kg s sliding along the frictionless horizontal surface with a speed of 2m/s. 1. What is the kinetic energy of the block? 2. A wedge is ...

science 6th grade
1.the nose diaphragm and lungs are part of the_________system circulatory excretory nervous respiratory(my answer)

Economic
A detailed explanation, with graphs of how the price of milk would have been determined in the absence of government involvement in market

life orientation
1 harassment 2.the arrests 3.sexual harassment

Life orentation
Right to education and health and work

life orientation
by being abused at home or any way of beaten and raped that's human rights violation and discrimination is to call the people by using bad names.

physics
A light spring of constant k = 95.0 N/m is attached vertically to a table (figure (a)). A 2.70-g balloon is filled with helium (density = 0.179 kg/m3) to a volume of 4.00 m3 and is then connected to the spring, causing the spring to stretch as shown in figure (b). Determine ...

physics
A 1.00-kg beaker containing 2.29 kg of oil (density = 916 kg/m3) rests on a scale. A 2.33-kg block of iron is suspended from a spring scale and is completely submerged in the oil (see figure below). Find the equilibrium readings of both scales. top scale N bottom scale N

physics
A light spring of constant k = 95.0 N/m is attached vertically to a table (figure (a)). A 2.70-g balloon is filled with helium (density = 0.179 kg/m3) to a volume of 4.00 m3 and is then connected to the spring, causing the spring to stretch as shown in figure (b). Determine ...

physics
A 1.00-kg beaker containing 2.29 kg of oil (density = 916 kg/m3) rests on a scale. A 2.33-kg block of iron is suspended from a spring scale and is completely submerged in the oil (see figure below). Find the equilibrium readings of both scales. top scale N bottom scale N

physics
Piston circled 1 in the figure below has a diameter of 0.28 in.; Piston circled 2 has a diameter of 1.6 in. In the absence of friction, determine the force vector F necessary to support the 500-lb weight. in lb i got 1.53 lb but it is incorrect

physics- help me please
The pressure at the bottom of a glass filled with water (ρ = 1000 kg/m3) is P. The water is poured out and the glass is filled with mercury (ρ = 13.6 ✕ 103 kg/m3). The pressure at the bottom of the glass is now which of the following? a)equal to P b)smaller ...

physics- help me please
Suppose you have two cubic meters of uranium, four cubic meters of lead, four cubic meters of copper. Rank them by mass, from smallest to largest. a)lead, copper, uranium b)uranium, copper, lead c)copper, uranium, lead d)uranium, lead, copper can someone help me

math probability
thanks!

math probability
Two friends were each rolling a die. After they rolled, they found the sum of the numbers showing on each die. What is the probability that the sum is 7? I added the sides together and simplified to get 1/6, but I don't think that's right.

Math/Algebra
Rashid picks 420 strawberries in 5/6 hour. Write and solve an equation to find how many strawberries can she pick in the space of an hour? I'm not good with word problems, and am completely lost. I can do everything except the equation (I think). Please help!

history
What was Robert Lindeux’s purpose in painting this event? What evidence in the painting suggests his purpose?

Art
Can someone check my answers?

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