Monday

February 8, 2016
Total # Posts: 4,662

**physics **

An electron at ground state in the atom (-10.38eV)is struck by a passing electron with 7.00eV of energy. What is the velocity of the passing electron afrer the collision?
*September 23, 2013*

**physics **

An electron at ground state in the atom (-10.38eV)is struck by a passing electron with 7.00eV of energy. What is the velocity of the passing electron afrer the collision?
*September 23, 2013*

**physics**

Neon-20 has a nuclear mass of 19.992439 amu. the total nuclear binding energy for Ne-20 is? (Mprotons=1.6726x10^-27 kg) (Mneutron=1.6749x10^-27kg)
*September 23, 2013*

**AP Physics**

A pail of water is rotated in a vertical circle of radius r = 1.49 m. The acceleration of gravity is 9.8 m/s 2. What is the minimum speed of the pail at the top of the circle if no water is to spill out? Answer in units of m/s
*September 23, 2013*

**Physiology**

How does semiconservative relates to DNA replication?
*September 22, 2013*

**math**

thank you very much
*September 22, 2013*

**math**

Please help. round to the nearest penny [ hundredth] $10.13 x4.5
*September 22, 2013*

**chemistry**

A particle with the mass of a proton is trapped in a box. The particle falls from the n=3 state to the n=2 state and emits 0.16 meV of energy. What is the size of the box? Please report your answer in nm.
*September 21, 2013*

**physics**

An observer uses a 10 sided mirror to measure the speed of light. A clear image occurs every one-tenth of a rotation when the mirror is rotating at 4.31x10^2 rev/s. The total path of the light pulse is 60 km, measured from the light source to the mirrors and reflected back to ...
*September 20, 2013*

**Math, Trigonometry**

The height of a person on a ferris wheel is measured by function h(t)=38 sin 3.5 (t-4.0)+41.? h= height of person in feet t=represents the time in minutes. a) At what height, to the nearest tenth, are passengers loaded onto the Ferris wheel ? what characteristics of the graph ...
*September 19, 2013*

**Physics**

What net external force is required to give a 30 kg suitcase an acceleration of 2.5 m/s2 to the right? Answer in units of N
*September 18, 2013*

**Math**

Estimate the total weight of two boxes that weigh 9.4 lb and 62.6 lb using rounding and compatible numbers. Which estimate is closer to the actual weight?Why?
*September 17, 2013*

**College Algebre**

f(x)= -3x^2+5x-2 Find f(x+h)/h
*September 16, 2013*

**Maths**

Nth terms I have to find the first 5 terms in the nth sequence. please could someone show me how to work this out, using the example below so I can do the next set of questions. 10-2n
*September 16, 2013*

**Physics**

When nitrogen(atomic mass=14,atomic number=7) is bombarded with neutrons, the collision resulted in disintegrations in which alpha particles are produced. Represent this transmutation in symbolic equation .
*September 15, 2013*

**Biology 101 **

When we say an atom has an incomplete outer shell, this means the atom has ______________________ electrons in its outermost shell. Atoms that have incomplete outer shells usually seek to fill their shells by forming ____________________ ________________ through the sharing or...
*September 13, 2013*

**Math**

What should the n value be if I want to compound by the second? How about by the milisecond?
*September 12, 2013*

**math**

What is the coordinates of the x-intercept. -x + 5y = -15
*September 12, 2013*

**Geometry**

I think it's D
*September 11, 2013*

**Geometry**

A. √14 miles; √22 miles B. 7 miles; 11 miles C. 4√3 miles; 4√7 miles D. 4√3 miles; √22 miles
*September 11, 2013*

**Geometry**

Kristen lives directly east of the park. The football field is directly south of the park. The library sits on the line formed between Kristen’s home and the football field at the exact point where an altitude to the right triangle formed by her home, the park, and the ...
*September 11, 2013*

**Math - Fractions**

7 weeks
*September 10, 2013*

**Math, science**

assume the substance has a half-life of 12 years and the initial amount is 133 grams. How long will it be until only 40 % remains?
*September 10, 2013*

**Math, Trigonometry**

daylight in Calgary, AB each month is show in the table below.? Month Daylight (hrs) Jan 8.50 Feb 10.03 March 11.91 April 13.87 May 15.57 June 16.48 July 16.03 Aug 14.51 Sept 12.63 Oct 10.68 Nov 9.20 Dec 7.99 a) Determine the regression equation that models the number of ...
*September 9, 2013*

**physics**

1. When material decays, it emits a particle. An experiment similar to the J.J. Thomson experiment is performed to determine the charge-to-mass ratio of this particle. It is found that the particle moves undeflected through mutually perpendicular magnetic and electric fields ...
*September 9, 2013*

**Math**

Thanks so much! it helped alot :D
*September 9, 2013*

**Math**

how do you know if one is a factor of another without dividing. a) 4320 can be divided be divided by 2,5,10 evenly. How? b)can 4230 be divided by 3 and 9? c) can 98,022 be divided by 2,3,5,9,10? use divisibility rules. I need help with these questions please i summed it up a ...
*September 9, 2013*

**physics **

a racing car completes a lap of a 300 meter circular track in 20 seconds. the car's average speed for the lap is most nearly a)0.0m/s b)10m/s c)15m/s d)20m/s e)31.4m/s
*September 2, 2013*

**pysics**

two automobiles are 60 miles apart an dtraveling in the same direction. The first automobile is behind the second and is moving at 60 mph and overtaking the second automobile which is moving at 45 mph. in how many hours will the first pass the second. a)4 b)2.5 c)1.75 d)1.5 e).55
*September 2, 2013*

**science**

1. Earth's capital includes all of the following except a. wildlife. b. nutrients. c. water. d. soil. e. sunlight.
*September 2, 2013*

**physics **

Find the horizontal and vertical components of the d = 140 m displacement of a superhero who flies from the top of a tall building following the path shown in Fig. P3.18 where θ = 28.0°.
*September 1, 2013*

**physics **

Chinook salmon are able to move through water especially fast by jumping out of the water periodically. This behavior is called porpoising. Suppose a salmon swimming in still water jumps out of the water with velocity 6.41 m/s at 44.1° above the horizontal, sails through ...
*September 1, 2013*

**math **

joshan bought 78 stickers she bought 4stripsof 10 and some singles how many singles did he buy
*August 29, 2013*

**physics**

An oil-drop, that has a mass of 3.5 × 10-15 kg and an excess of 7 electrons, is located between horizontal parallel plates. The plates are separated by a distance of 2.5 cm and have and potential diffeDetermine the magnitude and direction of the acceleration on the ...
*August 14, 2013*

**help**

How is a parent generation of a fern different from the generation that comes before or after it?
*August 10, 2013*

**algebra**

Gregg has q quarters and p pennies. His brother has 4 times as many quarters and 8 times as many pennies as gregg has. Write the sum of the numbers of coins they have, and then combine like terms
*August 10, 2013*

**math**

Gregg has q quarters and p pennies. His brother has 4 times as many quarters and 8 times as many pennies as gregg has. Write the sum of the numbers of coins they have, and then combine like terms
*August 10, 2013*

**physical**

A box slides downwards at a constant velocity on an inclined surface that has a coefficient of friction uK = .58 The angle of the incline, in degrees?
*July 30, 2013*

**math**

No clue .Never did this in 4th grade
*July 26, 2013*

**math **

Sally cuts a piece of paper to make a greeting card. Two opposite sides are 8 inches long. The other two opposite sides are 4 inches long. All the sides meet at right angles. How can this shape be classified? Name all the ways from most specific to most general.
*July 26, 2013*

**math**

Thought it was 30 but it didnt seem right. Too many flowers it seemed. Thank you
*July 26, 2013*

**math **

Jill is planting a row of flowers 10 ft long in her garden. If she plants a flower every 1/3 ft, how many flowers can she plant?
*July 26, 2013*

**math**

Thank you
*July 26, 2013*

**math**

What is the maximum number of 1-cm3 cubes that can fit into a box with a volume of 1,200 cm3
*July 26, 2013*

**math**

thank you
*July 26, 2013*

**math **

ED is making a scale drawing of a bridge on a shrrt of paper. The actual bridge is 200 feet long . To get the dimensions for the drawing, is ED multiplying by a number greater than 1 or a number less than 1 ? Explain
*July 26, 2013*

**calculus**

A ball is thrown straight downward from the top of a tall building, with an initial speed of 30 ft/s. Suppose the ball strikes the ground with a speed of 190 ft/s. How tall is the building? Acceleration is -32 ft/s squared
*July 24, 2013*

**math **

Which point is located on the y-axis of a coordinate plane? 6,0 3,2 6,6 0,6
*July 19, 2013*

**math **

what is the quotient of 3/4 divided by 3?
*July 19, 2013*

**chem**

waht is the kinetic energy in joules of 780-lb motorcycle moving at 54 mph?
*July 19, 2013*

**math**

Would it be 2,655
*July 19, 2013*

**math**

How would you show the work for this. Bills locker is 30 inches tall, 10 inches wide, and 14 inches deep. If his books take up 1,545 in. of space, how much space does he have left to hang his coat and bookbag? Thank you
*July 19, 2013*

**math**

thank you
*July 18, 2013*

**math **

Ted wants to make an input- output table with numbers of meters as input values and numbers of centimeters as output values. What rule should Ted use for his table?
*July 18, 2013*

**math**

Thank you so much
*July 18, 2013*

**math**

32/5 =6 2/5 ?
*July 18, 2013*

**math **

ED is wrapping 8 identicap presents. He needs 3/5m of ribbon to wrap each present. He needs an additional 1/5m of ribbon to make a bow. How much ribbon does he need to wrap and make bows for all 8 presents?
*July 18, 2013*

**math**

adding fractions
*July 16, 2013*

**math**

sorry lost, first time ever doing this. can you explain
*July 16, 2013*

**math **

part a: Lucy makes pottery to sell. One week , she uses 6 3/4kg of clay next week 2 2/3 clay. HOW much does she use during 2 weeks ? part b : The clay is in blocks that weigh 12 kg. How much clay does lucy have left after using clay for 2 weeks ?
*July 16, 2013*

**math **

In the number 13,407.036 there are two 3s. Explain how the values of the 3s are related. Thanks
*July 16, 2013*

**math**

Thanks
*July 16, 2013*

**math**

thank you. Iget it know
*July 16, 2013*

**math**

Ann bought 2/3 lb of carrots 3/4lb of celery and 7/8lb of onions. How many lbs of vegetables did she buy?
*July 16, 2013*

**algebra 2**

Which is the standard form of a circle with equation x^2 + 4x + y^2 - 6y = 3? A. (x+2)^2+(y+9)^2=16 B. (x-2)^2+(y-9)^2=3 C. (x+2)^2+(y-3)^=16 D. (x+2)^2+(y-3)^2=3
*July 14, 2013*

**Bio**

1. Some people get repeated fungal infections because they cannot destroy these dangerous microbes after their white blood cells phagocytize them. This most likely means that these people have __________ that do not work properly. A. ribosomes B. lysosomes C. mitochondria D. ...
*July 13, 2013*

**algebra 2**

Suppose y varies jointly with x and z, and x = 4 when y = 8 and z = -2.What is the value of x when y = 12 and z = 3? A. -4 B. 4 C. 15 D. 9
*July 11, 2013*

**math ,geometry**

kennedy
*July 11, 2013*

**math**

Thank you , now i get it.
*July 9, 2013*

**math**

Thank you for the answer. How do you multiply 360 by 3/8 ? We never were taught this
*July 9, 2013*

**math**

There are 360 people at a museum opening. Half of the people are museum supporters, 3/8 are artists, and the rest are museum employees. How many people are artists ?
*July 9, 2013*

**math**

Thank you
*July 9, 2013*

**math**

What is the standard form of the number 2x1 + 4x1/10 + 9x 1/1,000.
*July 9, 2013*

**Physics**

A 1650 kg car rolling on a horizontal surface has a speed of 20 km/hr when it strikes a horizontal coiled spring and is brought to rest in a distance of 3.5 m. What is the spring constant (in N/m) of the spring? (Ignore nonconservative forces such as friction.)
*July 8, 2013*

**Physics**

What is the minimum work in joules needed to push a 1840 kg car 14.0 m up a 12.5 degree incline? (Ignore friction.)
*July 8, 2013*

**math**

6000 and 1.875 ?
*July 8, 2013*

**math**

a room is 25ft long, 20 ft wide, and12ft tall. What is the volume of the room ? Second question a carpet is 2.5m long and 0.75m wide. What is the area of the carpet in square meters ?
*July 8, 2013*

**math**

Igot it now. Thank you so much
*July 8, 2013*

**math**

Thank you , but could you explain the factorization of 45? Idont get it
*July 8, 2013*

**math**

WHAT IS THE PRIME FACTORIZATION OF 45? and what is the sum of the only two prime numbers that differ by one ? Thank you
*July 8, 2013*

**algebra 2**

You are selling tickets for the homecoming football game. Student tickets cost $4 and general admission tickets cost $6. You sell 450 tickets and collect $2340. How many of each type of ticket did you sell? A. Not enough information B. 180 students;270 general C. 270 students;...
*July 5, 2013*

**math**

Thank you so much
*July 5, 2013*

**math**

No idea. Please help. Is 20 times 5/6 g reater than or less than 20? How do you do it? Second question What is 4/5 of 2/3?It shows a square and says find answer on the model. Any help, please
*July 5, 2013*

**math**

how do you do the following? 9/10 - ?= 17/30 and 3/10 + 4/5 = ? first time doing this . Thank you
*July 3, 2013*

**phy**

The fundamental interval of a thermometric scale is
*July 2, 2013*

**phy**

An ungraduated mercury thermometer attached to a millimeter scale reads 22.8 mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is. 20oC?
*July 2, 2013*

**Chemistry**

A hard water sample contains 121 mg of CaCO3 per liter of water. Calculate the mass of Na3Po4 needed to remove all Ca^2+ ions from 2.50 L of the water sample? Please help! This question is already on here, but I don't understand the part where it says substitute expression...
*July 1, 2013*

**math**

got it. ty
*June 28, 2013*

**math**

what would be the order from greatest to least 0.181, 0.38 , 0.139, 0.319 . any help would be appreciated. TY
*June 28, 2013*

**physics**

5. A bowling ball (mass = 7.2 kg, radius = 0.13 m) and a billiard ball (mass = 0.45 kg, radius = 0.028 m) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational force that each can exert on the other?
*June 27, 2013*

**physics**

A rocket of mass 4.36 × 105 kg is in flight near earth's surface. Its thrust is directed at an angle of 58.9° above the horizontal and has a magnitude of 9.61 × 106 N. Find the (a) magnitude and (b) direction of the rocket's acceleration. Give the ...
*June 24, 2013*

**Financial Math Help? (Determine compound period)?**

Future value of a $200 deposit in an account that earns 6.25% annual interest is $272.71 after 5 years. Determine the compounding period for this investment. My work: PV=FV(1+I/n)^ (-n) 200=272.71(1+0.0625/n)^-5n log0.73=log(1+0.0625/n)-5n This is where I got stuck. No idea ...
*June 11, 2013*

**Maths**

Hi, I am just doing some maths revision in light of my maths GCSE resit, which is very soon. I am sitting the higher paper for the first time, so some of the questions towards the end of the paper are very testing of my knowledge. At the moment I am going over past papers and ...
*June 5, 2013*

**english 2**

The paragraph below needs to be made more coherent. Use repetition, synonyms, and pronouns to link the sentences. Type the improved paragraph in the space provided on the following page Many cities are easily distinguished by their skylines. In such cities--New York and Paris...
*May 30, 2013*

**Math (Circles)**

Ok thats what I thought...thanks!
*May 29, 2013*

**Math (Circles)**

True or False If two circles have 4 common tangents, then the two circles intersect.
*May 29, 2013*

**Geometric Series question? Help!?**

A bouncy ball bounces to 2/3 of its height when dropped on a hard surface. Suppose the ball is dropped from 20 m. What is the height of the ball after the 6th bounce? Answer = 1280/729 m OR 1.75 m What is the total distance travelled by the ball after 10 bounces? 98.6 m So, I ...
*May 29, 2013*

**Calculus**

At noon, ship A is 10 nautical miles due west of ship B. Ship A is sailing west at 24 knots and ship B is sailing north at 19 knots. How fast (in knots) is the distance between the ships changing at 6 PM?
*May 24, 2013*

**chem **

At a pressure of 2 atm, hydrogen gas occupies a volume of 8 L. What pressure must the gas be under if the volume is increased to 10 L? Don't forget the units. im confused on how to set it up and plug the numbers in?
*May 23, 2013*

**probability**

a spinner has 5 sections and is spun 40 times. it lands on 2 six times. What is probability of spinning a 2?
*May 20, 2013*