Wednesday
December 7, 2016

Posts by jay

Total # Posts: 1,589

Physics
How much heat does a freezer need to remove from 1kg of water at 40°C to make ice at 0°C? (You will need to use the specific heat of water to drop the temperature first, before trying to make the phase change!) Show your work. Please help! Also, this site isn't ...
December 7, 2016

Physics
UPDATE: is this correct? c = Q/m?T 330000 = Q/3*0 Q = 330000*3*0 Q = 0
December 7, 2016

physics
Is the photoelectric effect a direct consequence of the wave character of E.M radiation or of the particle character of E.M radiation?
December 7, 2016

PHYSICS
Particles called mesons are produced by accelerator beams. if these particles travel at 2.70* 10^8 m/s and live 2.60*10^-8 s when at rest relative to an observee how long do they live as viewed in the laboratory?
December 7, 2016

math
What is the common difference d of the sequence? ?15, ?4, 7, 18, 29, ...?15, ?4, 7, 18, 29, ... Enter your answer in the box. d= ?
December 6, 2016

Science. Answer Check
A kitchen ceiling light has five light bulbs on it. When one of the lights goes out, the other four bulbs stay lit. This is an example of a series circuit. True*** False
December 6, 2016

Science. Answer Check
1. A student studying a circuit diagram of a lightbulb, battery, and a switch correctly identifies it as a closer circuit. In this diagram, The lightbulb would be a. an insulator b. on*** c. disconnected d. off 2. The focus of gravity on an object on the surface of Mars is ...
December 6, 2016

LANGUAGE
When the Chorus announces the suicide of Queen Jocasta, members of the audience may display an outward pouring of emotions. That process is known as _____. A) Catharsis B) Anagnorisis C) Peripeteia D) Hubris A?
December 2, 2016

Math
Which ordered pairs lie on the graph of the exponential function f(x)=128(0.5)^x ? Choose ALL correct answers. A. (0, 1) B. (1, 64) C. (3, 16) D. (8, 0.5) B and C? someone please help
December 1, 2016

Chemistry 1
What theoretical mass of MgO is produced if 0.150 g Mg3N2 is produced by strongly heating a 2.000 g sample of Mg in air?
November 30, 2016

math
30?
November 21, 2016

math
What is the average rate of change of the function f(x)=20(1/4)^x from x = 1 to x = 2? Enter your answer as a decimal. Do not round.
November 21, 2016

Math
Let f(x)=5^x Let g(x)=5^x?7 Which statement describes the graph of g(x)g(x) with respect to the graph of f(x)f(x) ? g(x)g(x) is translated 7 units down from f(x)f(x) . g(x)g(x) is translated 7 units right from f(x)f(x) . g(x)g(x) is translated 7 units left from f(x)f(x) . g(x)...
November 17, 2016

math
What is the percentage of 237 basketball shots taken, but only 103 made?
November 14, 2016

physics
What is the kinetic energy gained by a 500kg car accelerating from rest to 27m/s? 1/2=mv^2 > 1/2(500)(27m/s)^2= 182,250J a. What is the power output in watts of the engine that causes this acceleration in 4.00s? 27m/s*4s= 108m/s^2 1/2(500)(108)= 27,000 Watts b. How many ...
November 12, 2016

PHYSICS
Heat transfer Q and work done W are always energy in transit, whereas internal energy E is energy stored in a system. Give an example of each type of energy, and state specifically how it is either in transit or resides in a system.
November 12, 2016

Physics
Imagine you are driving a car up Pike’s Peak in Colorado. To raise a car weighing 1000 kilograms a distance of 100 meters would require about a million joules. You could raise a car 12.5 kilometers with the energy in a gallon of gas (if all stored chemical energy was ...
November 12, 2016

Pre-Calculus
14cos+7=O
November 10, 2016

Chemistry
what would the concentration of the solution of a sulfuric acid be titration of a 25.0 ml sample of acid required 20.00 ml of a 0.20 naoh standardized solution for it to become neutralized
November 10, 2016

Maths
The two 4's in the number 420.41 have different values. What is the difference in their values?
November 9, 2016

Chemistry
What mass of carbon dioxide is formed by the complete combustion of 760 g of ethanol?
November 6, 2016

Science
How many grams of sugar are needed to make a saturated solution of sugar in 100g of water at 20 degrees Celsius?
November 4, 2016

math
A function is graphed on the coordinate plane. What is the value of the function when x = ?4? Question 4 options: -4 0 4 5
November 3, 2016

Math
-5
November 3, 2016

Math
What is the value g(-3) when g(x) = 2x + 1? a.) 7 b.) -5 c.) 5 d.) -6
November 3, 2016

georgraphy
In the following passage written by a conquistador in 1540, what can you infer about how sick citizens were treated? “No one who was lazy or tried to live by the work of others was tolerated; everyone had to work. Thus on certain days each lord went to his lands and took ...
October 24, 2016

Math
Frank reads at least 24 pages but not more than 36 pages of a book. He reads 12 pages per hour. The number of hours Frank reads p pages is modeled by a function.   t(p)= p/12 1.) All real numbers from 2 to 3, inclusive. 2.) All real numbers. 3.) All real ...
October 21, 2016

PHYSICS
Explain for each of the following, The Magnus force applies and how it causes an effect. a. A car tire rotating while a car drives. b. A tennis ball curves while moving towards the opposite side of the net. c. A tennis ball changes directions when it hits the ground. d. A ...
October 16, 2016

Statistics
suppose that 80% of all 18 year olds play basketball. if a sample size of 4 is taken, find the probability that the sample proportion lies within and including one standard deviation of the population proportion
October 14, 2016

theatre
In Elizabethan Theatre, a playwright would use poetic dialogue to ____. A) Paint a picture of a scene. B) Establish the time and place of action. C) Familiarize the audience with characterization and physical attributes of the characters. D) All of these answers. D??
October 10, 2016

Theatre and Art
Once a playwright sold his manuscript, he could continue to collect royalties on his work. True or False
October 10, 2016

Physics
two campers in a national park hike from their cabin to the same spot on a lake each taking a different path. the total distance traveled along path 1 is 7.5 km and that along path 2 is 8.2 km. what is the final displacement of each camper?
October 7, 2016

Math
rectangle abcd picture above has length of 6 units and a width of 5 units. point d is the ordered pair. find the coordinates of a b c
October 2, 2016

Physics
Mass is measured in grams, acceleration is measured in meters per second squared, and distance is measured in meters. Force is equal to mass times accelaration, and work is equal to force times distance. What is the unit of work?
September 28, 2016

Maths grade 8
anyone????
September 27, 2016

Maths grade 8
Help how do I find "one exterior angle 180- interior angle" of 6,7, 9, 12 sides please show your work so I can understand thank you
September 27, 2016

math
The equation of a line is x + 4y = 15. What is the y-intercept of the line? −15 4/15 15/4 15
September 27, 2016

Math
2[3 + (10 – 4)2] 10 - 4 = 6 ^2 = 36 3 + 36 = 39 39 times 2 = 78 Am i right?
September 27, 2016

Math
If A is a square matrix, show that B=(A+A^T)/2 is a symmetric matrix.
September 25, 2016

English
are those right
September 23, 2016

english
I meant D not c. @writeacher
September 15, 2016

english
Which appositive phrase is punctuated correctly? Shakespeare, the great writer penned many famous sonnets. Shakespeare the great writer, penned many famous sonnets. Shakespeare the great writer penned many famous sonnets. Shakespeare, the great writer, penned many famous ...
September 15, 2016

english
@ms.sue
September 13, 2016

english
A and C
September 13, 2016

english
One of the themes of "The Interlopers" is that nature can be severe and unkind. Below, select the TWO best sentences that support the central idea that nature can be severe and unkind. Question 7 options: Sweating in the heat, we had lost the whole day, dreading to ...
September 13, 2016

Math
B?
September 8, 2016

Math
The formula for the perimeter of a rectangle is P = 2l + 2w. The length of a rectangle is 3 times its width. Which expression represents the perimeter of the rectangle? Question 3 options: 2 + w(3w) 2 + w(w + 3) 2(3w) + 2w 2(w + 3) + 2w
September 8, 2016

Chemistry
Please help, im currently stuck
September 7, 2016

Chemistry
How many grams of NaOH would you dissolve in pure water to make 400 mL of a 2.5% NaOH solution ? MW of NaOH = 40 g/mol
September 7, 2016

english
What is the complete predicate in the following sentence? Jasmine has always dreamed of traveling to other countries. has always dreamed traveling to other countries has always dreamed of traveling to other countries has dreamed
September 6, 2016

Math
Angle 1 and angle 2 are supplementary angles. m∠1 = 4x+3 m∠2 = 3x−5 What is the value of x? a.) x = 178 b.) x=178/7 c.) x=92/7 d.) x = 26
August 22, 2016

Maths Unitary Method
Due to direct proportion we have: Sol- 5 men = 7 women 1 men = 7/5 women 10 men = (7/5×10)women = 14 women (10 men + 5 women = (14 women + 5 men) Let Rs x money be earned 7/875=19/x 1/125=19/x (1×x)=(125×19) x=Rs 2375
August 19, 2016

Science
D?
August 16, 2016

Science
Under the 1980 Low-Level Radioactive Waste Policy Act, each state must take responsibility for its non-defense related, low-level nuclear waste. If nuclear waste was NOT regulated and disposed of properly, which of these could be a possible effect? A) The risk of cancer in ...
August 16, 2016

Maths
you need to go on a trip to other ancient sites. Your plane takes off at 10:00 am from an airfield, and flies at 120 km/h on a bearing of 325 degrees T. your crew and equipment are in a second (incorrect flight) plane that takes off at 10:05 am from the same airfield, and ...
July 29, 2016

Msth
1,130 miles. 25 miles per gallon @ 2.60 per gallon. How much money on fuel.
July 21, 2016

Physics
A paper ball is dropped from a height of 5 meters above the ground. It hits the ground traveling with a speed of 2 m/s. How much work did air resistance do on the paper ball? I don't know how to start this. PLease help
July 20, 2016

Language
The Giver - How does the content of Jonas’s memories change as he approaches the summit of the hill? Please help!
July 12, 2016

Physics
a car which 100 m away from a polic station and is initially at rest started running at 80 m/s. How far wil the car be from the police station after 20 seconds
July 10, 2016

Math
Nadine dives with a senior swim club. In a dive off a 10m platform she reaches a maximum height of 10.5m after. 35s. How long does it take her to reach he water?
July 7, 2016

Physics
No Idea if I am doing this right. But so far what I done was 10.5Sin(67.6) = - gΔt and got -9.71
July 5, 2016

Physics
A catapult is launching rocks at your village. It is hiding in a forest. All you can measure is that the rock just passes over an 8 meter tall tree that is 73 meters from the village and that it takes 3 seconds for the rock to arrive from that moment. How far is the catapult ...
July 5, 2016

math
yes
June 27, 2016

Probability
Kindergarten class has 7 Scooby Doo , 8 Sesame Street, and 9 Barney DVDs. Each week, the class randomly selects 2 DVDs to watch on Friday. What is the probability that both movies are Barney?
June 25, 2016

Probability
bobpursley Thank you! I get easily miss lead by wording between combination and permutations problems
June 25, 2016

Probability
The Brass Tap stocks 12 different beers, which it rotates randomly among its 8 taps. They will have one beer for each tap, and no two taps will have the same beer on any given evening. How many different beer menus do they need to stock.
June 25, 2016

english
Change the italicized clause to a nominative absolute. Rewrite the entire sentence in the box below. As the hurricane season was over, people returned to the cottages on the beach. as the hurricane season was over is italicized.
June 23, 2016

physics
Two charges of magnitude +2×10^–6 C each are 60cm apart. find the magnitude of the force exerted by these charges on a third charge of magnitude +4×10^-4C that is 50cm away from each of the charge.
June 10, 2016

math
the length of a rectangular garden is 4m more than its width determine the gardens width if the area is 117m^2
May 30, 2016

physics pls help
thanks bob
May 29, 2016

physics pls help
Please can someone show me how to go about this problem? The X-Y plane is illuminated by an electric field of strenght given as E=(24î + 60j + 70k) N/C; the flux through a 1.5m² potion of the illuminated plane is
May 29, 2016

physics
Please can someone show me how to go about this problem? The X-Y plane is illuminated by an electric field of strenght given as E=(24î + 60j + 70k) N/C; the flux through a 1.5m² portion of the illuminated plane is
May 29, 2016

Socials studies
What were the effected of having to use rivers to complete such long journey? Help plss
May 25, 2016

chem
born haber cycle is not generally used to consider the energy changes involved in the formation of solid silicon(IV)oxide SiO2 because it has a very high temperature explain
May 20, 2016

chemistry
it has a very high melting point I get it. but what does it mean? why is it a factor?
May 19, 2016

chemistry
why is born haber cycle not generally used to consider the energy changes involved in the formation of solid silicon(IV)oxide SiO2
May 19, 2016

chemistry
I mean why are their bonds different? why does Becl2 form covalent molecule and SiO4 a covalent network solid?
May 18, 2016

chemistry
why does BeCl2 have low melting point but SiO4 has high melting point even though they are both covalent bonds between the atoms
May 18, 2016

ms sue?
Suppose that in a population of shoppers, the proportion of people who had visited supermarket A last month is 0.22. Also that in the same population, the proportion of people who had visited supermarket B last month is 0.46. The proportion of shoppers who had visited both ...
May 17, 2016

please help
8.03 (to 2 d.p) Thanks
May 17, 2016

please help
In a study about children’s pocket money, two samples of schoolchildren were asked how much money they received each week. In one sample, of size 25, the mean is £6.00. In the other sample, of size 43, the mean is £9.21. Calculate the mean based on the ...
May 17, 2016

Mech. Engr./Dynamics/Physics/Math
A ball is dropped with a velocity v0 and an angle alpha with the vertical onto the top step of a flight of stairs consisting of 10 steps. The ball rebounds and bounces down the steps where the coefficient of restitution between ball and step is e=0.6. The friction between ball...
May 16, 2016

Mech. Engr./Dynamics/Physics/Math
A ball is dropped with a velocity v0 and an angle alpha with the vertical onto the top step of a flight of stairs consisting of 10 steps. The ball rebounds and bounces down the steps where the coefficient of restitution between ball and step is e=0.6. The friction between ball...
May 15, 2016

Marketing
Which of the following BEST describes the Internal Analysis planning tool?
May 15, 2016

calculus
evaluate the definite integrals 1 ∫ root(1+3x) dx 0
May 8, 2016

calculus
evaluate the definite integr 2 ∫ 5/(3+2x) dx 0
May 8, 2016

math
what is 9 minus 3 divided by 1/3 plus 1?
May 7, 2016

Finite Math
A student is making out her schedule for next year. Her list consists of 9 required courses and 12 elective courses. She must take at least 4 courses but cannot take more than 6 courses. In how many ways can she select courses such that she takes at least one elective course?
May 4, 2016

Please help
what is the sum of arithmetic series 2+5+8+...+260?
May 3, 2016

my brother is not learning
Okay, Thank you Reed
May 3, 2016

my brother is not learning
My mom also tried a lot.
May 3, 2016

my brother is not learning
I have a brother who is 5 years old, he is going to UKG. I managed to teach him the alphabet and numbers, but I'm struggling to teach him letter sounds. He is obsessed with TV he will not come to study. I am a middle schooler by the way.
May 3, 2016

calculus
rewrite each summation using the sigma notation. Do not evaluate the sums (a)3 + 4 + 5 + . . . + 93 + 94 (b)9 + 16 + 25 + 36 + . . . + 14
May 2, 2016

calculus
You own a small airplane that holds a maximum of 20 passengers. It costs you $100 per flight from St. Thomas to St. Croix for gas and wages plus an additional $6 per passenger for the extra gas required by the extra weight. The charge per passenger is $30 each if 10 people ...
May 2, 2016

calculus
Find the dimensions of the rectangle with the largest area if the base must be on the x-axis and its other two corners are on the graph of: (a) y=16-x²,-4<=x<=4 (b)x²+y²=1 (c)|x|+|y|=1 (d)y=cos(x),-pi/2<=x<=pi/2
May 2, 2016

calculus
Evaluate lim (1³ +2³ +3³ +…+ n3)/n^4 n →∞ by showing that the limit is a particular definite integral and evaluating that definite integral.
May 2, 2016

calculus
Evaluate π ∫ tan² x/3 dx 0
May 2, 2016

calculus
Use the Fundamental Theorem of Calculus to find G'(x) if: G(x)=∫ up(x²) bottom(1) cost dt
May 2, 2016

calculus
Use the Fundamental Theorem of Calculus to find G'(x) if: /x² G(x)= / cos t dt / 1
May 2, 2016

calculus
I'm having trouble on this question: Find the area of the region in the first quadrant that is bounded above by the curve y= sq rt x and below by the x-axis and the line y=x -2.
May 2, 2016

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