Thursday

January 29, 2015

January 29, 2015

Total # Posts: 983

**Physics**

A light ray traveling through air strikes a smooth, flat slab of crown glass at an angle of 30 degrees to normal. Index of refraction for crown glass is 1.66. What is the angle of refraction?
*April 22, 2013*

**Calculus**

An animal population is increasing at a rate of 150+20t animals per year. By how much does the animal population increase between year 5 and year 8?
*April 17, 2013*

**math**

The answer is 20 because one equals 10 and since there are two multiply 10*2 which will equal 20 or just add 10+10 which equals 20.
*April 16, 2013*

**Physics 1**

A mass m1 = 4.9 kg rests on a frictionless table and connected by a massless string over a massless pulley to another mass m2 = 4.7 kg which hangs freely from the string. When released, the hanging mass falls a distance d = 0.8 m.
*April 5, 2013*

**science**

if aluminum has the density of 2.7g what would the mass be?
*April 4, 2013*

**Physics**

At the train station, you notice a large horizontal spring at the end of the track where the train comes in. This is a safety device to stop the train so that it will not plow through the station if the engineer misjudges the stopping distance. While waiting, you wonder what ...
*March 26, 2013*

**Physics**

At the State Fair you see people trying to win a prize at a game booth. They are sliding a metal disk shaped like a puck up a wooden ramp so that it stops in a marked zone near the top of the ramp before sliding back down. You estimate that you can slide the 'puck' at ...
*March 26, 2013*

**Physics**

The Navy wants a new airplane launcher for their aircraft carriers that is basically a large spring and your job is to determine the necessary spring constant. The launcher pushes the plane for a short distance along a much longer runway. During that same time, the plane's...
*March 26, 2013*

**Physics**

Your artist friend's new work is a simple, high-impact kinetic sculpture called 'Destruction.' A 200-kg steel block is hung from the ceiling by an 8-foot-long rope. A second rope is attached to the side of the block. The other end of this second rope is attached to...
*March 26, 2013*

**physics**

As part of a fundraiser, you want the new dean to bungee jump from a crane. The jump will be made from 44 m above a 2.5 m deep pool of Jello. A 30 m long bungee cord would be attached to the dean's ankle. You must convince the dean that your plan is safe for a person of ...
*March 26, 2013*

**physics**

A 2.6-kg particle moving along the x axis has a velocity of +1.7 m/s as it passes through the origin. It is subjected to a single force, Fx, that varies with position, as shown below.
*March 26, 2013*

**PHYSICS**

Efinal= 1/2mvi^2+fd
*March 26, 2013*

**Dynamics**

The 10 kg block shown is released from rest on the horizontal surface at point B, where the spring has been stretched a distance of 0.5 m from its neutral position A. The coefficient of kinetic friction between the block and the plane is 0.30. Calculate (a) the velocity v of ...
*March 24, 2013*

**writing**

NEED HELP WITH ANALOGIES PLEASEEEEEE DESCENDANT:ANCESTORS
*March 21, 2013*

**science**

How do organs relate to cells and tissues?
*March 20, 2013*

**Math**

The median score on attest is 90. Is it possible to add two or more scores to the data and still have a median score of 90? Explain
*March 14, 2013*

**physics**

A concave shaving mirror has a radius of curvature of 28.0 cm. For each of the following cases, find the magnification and determine whether the image formed is real or virtual and upright or inverted. (a) an upright pencil placed 41.6 cm from the mirror. (b) an upright pencil...
*March 12, 2013*

**physics**

A convex mirror with a radius of curvature of 34.0 cm forms a 0.95 cm tall image of a pencil at a distance of 12.5 cm behind the mirror. Calculate the object distance for the pencil and its height. Is the image real or virtual? What is the magnification?
*March 12, 2013*

**Math**

A plane flys 425 miles with the wind and 350 miles against the wind in the same length of time if the speed of the wind is 15 mph what is the speed of the plane
*March 8, 2013*

**english 11**

what were the rest of the answers
*February 13, 2013*

**combustion**

A glass melting furnace is burning ethene in pure oxygen (not air). The furnace operates at an equivalence ratio of 0.9 and consumes 30 kmol/hr of ethene. Determine the energy input rate based on the LHV of the fuel in terms of kW. •Determine O2 consumption rate in kmol/hr.
*January 30, 2013*

**Math**

2- digit number. There are nine tens. The sum of its digits is 12. What is the number?
*January 22, 2013*

**Science**

Compare how much kinetic energy and potential energy the ball has at each point and describe why the ball has that energy
*January 17, 2013*

**math 6th grade**

Well, a cube is like a square. The only different with them is that a cube is 3D while a square is flat. On a square, each side is the same length. So, on a cube if one side is 1/6, then all of the sides have to be 1/6. A cube has 6 sides, yes? ANSWER: 1/6 is the simplest form.
*January 15, 2013*

**Math 7**

Suppose you copy a drawing of a polygon with the given size factor. How will the side lengths, angle measures, and perimeter of the image compare to those of the original? A.) 200% B.) 150% C.) 50% D.) 75%
*January 15, 2013*

**Math**

Thank you
*January 9, 2013*

**Math**

My son homework does not have 107 number it only goes up to 100
*January 9, 2013*

**Math**

What number is 3 tens more than 77?
*January 9, 2013*

**Math**

What number is 4 tens more than 26.?
*January 9, 2013*

**health**

It's A
*January 2, 2013*

**Health**

It's C
*December 30, 2012*

**math**

45 miles = ? feet _______ __________ 1 hour 1 second what is the feet ?
*December 30, 2012*

**English**

Corrections: 1. B: Feast of Lupercalia 2. A: Class Conflict 3. D: The Soothsayer 4. B: Caesar turning down a crown that Mark Antony is offering him 5. A: Cinna the Poet 6. C: Sending him unsigned letters 7. D: All of the above 8. B: Portia 9. B: she sees a statue of Caesar ...
*December 12, 2012*

**english 11**

What surprising action does Locust take at the end of the story? (1 point)He scratches on the eight ball. He shows up at the Lemon Tree Billiards House.*** He turns himself in to the local authorities. He sets Mitch up with his daughter. help? not sure if correct
*December 8, 2012*

**math**

estimate the percent of the number 17% of 23
*December 8, 2012*

**math**

on 3 tests you earned grades of 88%,94%,and 90%. Each test worth 150 points. The finalo exam is worth 250 points. How many points do you need on the final exam to earn 93% of the total points on tests? What percent do you need on the final?
*December 5, 2012*

**math**

on 3 tests you earned grades of 88%,94%,and 90%. Each test was worth 150points. The final exam is worth 250 points. How many points do u need on the final exam to earn 93% of the total points on tests? What percent do you need on the final?
*December 4, 2012*

**math**

A building 65 feet tall casts a shadow 175 feet long. Ben casts a shadow 14 feet long. How tall is Ben?
*December 3, 2012*

**Econ**

If a pure monopolist can price discriminate by separating buyers into two or more groups: A.the marginal revenue curve and the total revenue curve will now coincide. B.the marginal revenue curve will now shift to a position above the demand curve. C.the firm will face multiple...
*November 30, 2012*

**Math**

x = 3, 10, 5, 8, _, 12, _ y = 7, 21, _, _, 5, _, _
*November 27, 2012*

**Math**

x = 3, 10, 5, 8, _, 12, _ y = 7, 10, _, _, 5, _, _
*November 27, 2012*

**physics**

An open-topped tank completely filled with water has a release valve near its bottom. The valve is h = 1.9 m below the water surface. Water is released from the valve to power a turbine, which generates electricity. The area of the top of the tank, A_T, is 38 times the cross-...
*November 27, 2012*

**physics**

A 74.0 kg ice skater moving to the right with a velocity of 2.58 m/s throws a 0.18 kg snowball to the right with a velocity of 24.4 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
*November 8, 2012*

**physics**

Two carts with masses of 4.00 kg and 3.40 kg move toward each other on a frictionless track with speeds of 4.70 m/s and 3.56 m/s respectively. The carts stick together after colliding head-on. Find the final speed.
*November 8, 2012*

**physics**

A 2.7 kg ball strikes a wall with a velocity of 7.8 m/s to the left. The ball bounces off with a velocity of 6.6 m/s to the right. If the ball is in contact with the wall for 0.19 s, what is the constant force exerted on the ball by the wall?
*November 8, 2012*

**physics**

A 74.0 kg ice skater moving to the right with a velocity of 2.58 m/s throws a 0.18 kg snowball to the right with a velocity of 24.4 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
*November 8, 2012*

**Pre calc**

A set of 500 values has a normal distribution. The mean of the data is 24 and the standard deviation is 2. Find the range about the mean which includes 50% of the data.
*November 4, 2012*

**Chemistry**

298/-8.64=-34.49 298=273+20
*November 1, 2012*

**Chemistry**

i thought i did
*November 1, 2012*

**Chemistry**

(1.080)(-8)=(265)(P) -8.64=265P 265p/ -8.64= -30.67
*November 1, 2012*

**Chemistry**

A pressurized can of whipped cream has an internal pressure of 1.080 atm at 25°C. If it is placed in a freezer at -8°C, what is the new value for its internal pressure (in atmospheres)? I did this but got a negative number that wasnt correct
*November 1, 2012*

**Chemistry**

A pressurized can of whipped cream has an internal pressure of 1.080 atm at 25°C. If it is placed in a freezer at -8°C, what is the new value for its internal pressure (in atmospheres)? So i tried (1.080)(-8)=(P)(265) and I got -30.67 but its no correct. What am I ...
*November 1, 2012*

**Chemistry**

So i tried (1.080)(-8)=(P)(265) and I got -30.67 but its no correct. What am I doing wrong?
*November 1, 2012*

**Chemistry**

A pressurized can of whipped cream has an internal pressure of 1.080 atm at 25°C. If it is placed in a freezer at -8°C, what is the new value for its internal pressure (in atmospheres)?
*November 1, 2012*

**chemistry**

Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 70. cm3. If the combustion of this mixture releases 885 J of energy, to what volume will the gases expand against a constant pressure of 645 torr if all the energy of combustion is...
*October 22, 2012*

**math**

Assuming the sequense... _,2,_,_,27/4 Is geometric find the missing terms and the formula for t(n)
*October 18, 2012*

**Math 6th Grade**

I have to create a double number line graph and im not sure if i'm doing it right? Jenny can make 10 flower arrangements in 5 minutes. How many arrangements can she make in 6 min? 4 1/2 min? 3 min?. What is the unite rate?
*October 17, 2012*

**physics need help please**

There are 7 charges, each with q = -5 nC distributed on a circle with radius R=3cm. The center of the circle is at the origin. The charges are at angles 0o, 45o, 90o, 135o, 180o, -90o, and -45o. (Note: A charge at -135o is missing.) a) What is the net electric field at the ...
*October 17, 2012*

**physics need help please**

There are 7 charges, each with q = -5 nC distributed on a circle with radius R=3cm. The center of the circle is at the origin. The charges are at angles 0o, 45o, 90o, 135o, 180o, -90o, and -45o. (Note: A charge at -135o is missing.) a) What is the net electric field at the ...
*October 17, 2012*

**health**

It's D: For at least 60 minutes each day or almost everyday.
*October 16, 2012*

**Physical Science**

3. (a) How much work is done in raising a 50.0 kg crate a distance of 3.5 m above a storeroom floor? (b) What is the change of potential energy as a result of this move? (c) How much kinetic energy will the crate have as it falls and hits the floor?
*October 11, 2012*

**7th grade math ASAP quick please**

I know It doesn't matter anymore but the answers are 1.|3.12 2.|10.9 3.|15 4.|27
*October 8, 2012*

**Physics**

Need Help with physics! Two cars drive on a straight highway. At time t = 0, car 1 passes mile marker 0 traveling due east with a speed of 17.0 m/s. At the same time, car 2 is 1.3 km east of mile marker 0 traveling at 30.0 m/s due west. Car 1 is speeding up with an ...
*October 4, 2012*

**Physics **

How long does it take an automobile traveling 74.3 km/h to become even with a car that is traveling in another lane at 58.3 km/h if the cars’ front bumpers are initially 114 m apart? Answer in units of s
*September 24, 2012*

**probability**

A pair of fair dice is rolled. What is the probability of at least one 3 cast
*September 21, 2012*

**physics**

A diver jumps off a diving board with a speed of 25m/s he returns to the water after 3s. At the top of his dive describe his velocity and his acceleration?
*September 19, 2012*

**algebra**

Determine whether y varies directly with x. If so find the constant of variation k and write the equation. x y 7 11 8 13 9 15 10 17 Can someone please help me and explain
*September 19, 2012*

**algebra**

Thank you that is what I finally figured but wasnt sure about the graph
*September 18, 2012*

**Calculus**

Find a linear function whose graph is the plane that intersects the xy-plane along the line y=2x+2 and contains the point (1,2,2).
*September 17, 2012*

**Calculus**

Find a linear function whose graph is the plane that intersects the xy-plane along the line y=2x+2 and contains the point (1,2,2).
*September 17, 2012*

**algebra**

Can someone please explain this problem to me?
*September 17, 2012*

**algebra**

question; you research the average cost of a tank of gasoline for a certain type of car for several recent years to look for trends. the table shows your data. what is the equation for a line of best fit? how much would you expect to pay for a tank of gas in the year 2024? ...
*September 17, 2012*

**Math**

John's high score on the Asteriud Game was 326,700. Mike's high score was 418,200. Rebecca just played the game and her high score was halfway between John's and Mike's. What was Rebecca's score?
*September 17, 2012*

**Calculus**

Find a linear function whose graph is the plane that intersects the xy-plane along the line y=2x+2 and contains the point (1,2,2).
*September 17, 2012*

**health**

It's A.
*September 7, 2012*

**algebra**

Could someone please check my work. what is the slope of the line that passes through the given points?(2,12( and (6,11) -1/4 (my choice) 1/4 4 -4 My work: 11-12/6-2=-1/4 what is the slope of the line that passes through the given points? undefined( my choice) 0 -2/3 -3/2 My ...
*September 7, 2012*

**algebra**

Oh okay thanks for explaining
*September 4, 2012*

**algebra**

pi*7=7*pi would this be associate property of multiplication
*September 4, 2012*

**algebra**

Okay I get it I was close just didn't now what to do with the negative sign. Thanks for helping
*September 4, 2012*

**algebra**

-(4h-1)/1+h; h=2 the 4h-1 is on top of 1+h please can someone explain
*September 4, 2012*

**algebra**

I see where I made my mistake I took -72 + 2. Thank you.
*September 4, 2012*

**algebra**

9[9-8x]=2x+3 Please can someone explain
*September 4, 2012*

**algebra**

complicated but I think I understand thanks so much
*September 4, 2012*

**algebra**

[-4b-8]+[-1-b^2]+2b^3; b=-2 please can someone explain
*September 4, 2012*

**math**

solve the absolute value 3/2x+4/-1=11 // stands for brackets could someone explain /2x+7/<=27 /2x+10/>26 /2x-1/=3 I do not understand if someone could help
*September 3, 2012*

**Science**

If while the mass was hanging from a spring scale you pulled up sharply on the scale what do you think would happen to the reading on the scale?
*August 30, 2012*

**Science**

So would the answer be 50?
*August 30, 2012*

**Science**

What is the force of 10m/s squared acceleration and 5 kg mass?
*August 30, 2012*

**English 11**

#5 I believe is these colonies are, and of right ought to be, free and independent states #6 I believe is a list if grievances is attached
*August 29, 2012*

**math**

Thank you for explaining
*August 27, 2012*

**math**

solve the inequality 8/x+3/4/<2 used / / for brakets around x+3/4 possible answers x<-1 or x>-1/2 -5/32<x<5/32 -1<x<-1/2 x<-5/32 or x>5/32 not looking for just the answer but help on how to do it
*August 27, 2012*

**math**

Thank you Steve
*August 27, 2012*

**math**

Solve the equation check for extraneous solutions 6/6-4x/=8x+4 I used/ / for the brackets posssible answers x=1 x=5/2 or x=2 x=5/2 x=5/2 or x=1 Not looking for just the answer, would like to know how to get it.
*August 27, 2012*

**math**

Thank you for showing me how to do these really helps alot.
*August 26, 2012*

**math**

Can someone please help with solving compound inequality. !.) 6x-4<-34 or 3x+10>10 2.) -2<=2x-4<4 I'd appreciate if someone can explain not looking for just answer. Thank you
*August 26, 2012*

**algebra2**

solving compound inequality can someone please help I don't understand.
*August 26, 2012*

**algebra2**

-5y-9=-(y-1) how would one solve this problem, I'm not sure
*August 24, 2012*

**math**

use properties of real numbers to rewrite the expression (3/5)(5/3).. dont understand.
*August 23, 2012*

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