# Posts by DJ

Total # Posts: 287

**physics**

A boat that travels at a speed of 6.75 m/s in still water is to go directly across a river and back, as shown in the figure below. The current flows at 0.50m/s At what angles must the boat be steered? How long does it take to make the round-trip? (Assume that the boat's ...

*September 13, 2012*

**algebra/trigonometry**

find the smallest positive number that is the difference of two three-digit integers made up of the digits 1, 2, 3, 6, 7, 8 where each digit is used once.

*September 9, 2012*

**math**

1/3 1 /4 . 035 13%greatest to least

*September 5, 2012*

**chemistry**

what is the change in heat when 23.5g water vapor at 100C condenses to liquid 18.50C

*April 26, 2012*

**physics**

b. If you are cruising down the road at 50 mph and a policeman with a radar gun (wavelength 1 cm) reflects radar light off your bumper, what wavelength of radar light does he get back? Assume the policeman is stationary, and you are moving towards him. Light that gets ...

*April 15, 2012*

**math**

I have a surface area? my base is 18m, height is 4m and wisdth is 14m - do not understand the equation given by teacher of: top bottom, both sides and front and back to get answer - this does not make sense to me - please explain

*April 11, 2012*

**physics**

250N,1020N,1.2N

*March 30, 2012*

**Chemistry**

make sure to convert millimolar to molar

*March 14, 2012*

**Chemistry**

Part 1 is A Part 2 is C none of the above

*March 8, 2012*

**physics**

The correct answer is C, A, B

*March 3, 2012*

**math**

a = 19 and m<A=32 degree. find b

*February 7, 2012*

**calculus**

int_(-2)^2sqrt(4-x^2)text()dx evaluate the integral

*February 5, 2012*

**calculus**

int_(-2)^2sqrt(4-x^2)text()dx evaluate the integral

*February 5, 2012*

**math**

what is the largest prime less than 1000? explain how you got ypur answer

*January 25, 2012*

**math problem**

very confused could someone help me with this using the elimination method 5r-3s=16 3r+5s=30

*January 21, 2012*

**Math Problem**

how is it to solve for the indicated leter L = 7F, FOR f

*January 21, 2012*

**math problem**

8x-(6x+7) =-3 42x + 7=-3 42+7-7= -3-7 x=10 42/10 = 4.2

*January 21, 2012*

**math problem**

haveing problem solving 8x -(6x+7)= -3 The solution is x =

*January 21, 2012*

**MATH PROBLEM**

COULD I GET HELP SOLVING THIS PROBLEM USING THE DISTRIBUTIVE PROPERTY 5(W-5)= 10 W =

*January 21, 2012*

**Math Question**

could some help me with this problem Solve and steps -0.5x < -15

*January 21, 2012*

**math question**

solve using additin and multiplication principle 6+8x<22

*January 21, 2012*

**Math question**

Please help me to solve by substitution method. 7x+8y =44 x=41-5y

*January 20, 2012*

**Calculus**

(y/(x+9y))= (x^2)-7 at the point (1, -6/55) Use implicit differentiation to find the slope of the tangent line to the curve

*October 28, 2011*

**Calculus**

Use implicit differentiation to find the slope of the tangent line to the curve 2(x^2) + 2xy + 2(y^3)= -18

*October 28, 2011*

**Calculus**

f(x)= 6ln(2x+7ln(x)) I need to find the first derivative.

*October 28, 2011*

**Chemistry**

24.5 mL of concentrated HCl is diluted to make 455 mL of .256 M solution. What is the molarity of the concentrated HCl?

*October 25, 2011*

**Calculus**

(A) Given that P = {X0, X1, X2.......Xn} is an arbitrary partition of [a,b], find the lower and upper sum for f(x)=x+3. (B) Use your answers to part (a) to evaluate the integral of f(x) from a to b.

*October 16, 2011*

**Calculus**

A right circular cone is inscribed in a sphere of radius r. Find the dimensions of the cone that maximize the volume of the cone.

*October 16, 2011*

**Calculus**

Show that of all rectangles with diagonal length c, the square has the largest area.

*October 16, 2011*

**physics**

ohh.. now i've got it thank you

*October 8, 2011*

**physics**

You are given a vector in the plane that has a magnitude of 86.0 units and a component of -30.0 units. What are the two possibilities for its component?

*October 8, 2011*

**Calculus**

show lim x->3 (sqrt(x)) = (sqrt(c)) hint: 0< |sqrt(x)-sqrt(c)|= (|x-c|)/(sqrt(x)+sqrt(c))<(1/(sqrt(c))*|x-c|

*October 4, 2011*

**math**

the number of my hunderds plus the number of my thousandsin 3. the number of my tens is 7 times the number of my hundreds. the number of my ones is 3 times the number of my thousands. allmy digits are differnt. what number am i ?

*September 28, 2011*

**BUSN**

$1,000,000 and $800,000 respectively

*September 6, 2011*

**geometry**

the surface area of a prism is 120 sqaure cm and the area of each base is 32 square cm find the lateral area of the prism.

*June 21, 2011*

**Math**

How many grams of saline are needed to make 300 ml of 0.9%(w/v) saline?

*June 8, 2011*

**Algebra 2**

Solve the equation 6(3x + 1) = 8. Round the answer to four decimal places.

*June 4, 2011*

**statistics**

A vending machine dispenses coffee into a sixteen ounce cup. The amount of coffee dispensed into the cup is normally distributed with a standard deviation of 0.03 ounces. You can allow the cup to overfill 10% of the time. What amount (in ounces) should you set as the mean ...

*May 25, 2011*

**science 4grade**

Maybe you meant "compete"? To compete means to try to win or do better than others. Based on your example (which are plants), when they get crowded, the amount of resources intended for them has decreased to a very small amount. This amount cannot sustain their needs...

*May 24, 2011*

**Physics 101**

I figured it out already, thanks. I was just having trouble with converting dB to W/m^2. Anyway, here's my answer. Feel free to correct it. I - Intensity P - Power E - Energy t - time A - Area I = P/A ; I = E/t / A ; E = IAt Io = 1x10^-12 W/m^2 (treshold of hearing) ...

*May 19, 2011*

**Physics 101**

A 90-dB sound is absorbed by an eardrum 0.75 cm in diameter for 2 hours. How much energy in joules does the eardrum absorb at that time?

*May 19, 2011*

**education**

what are strategies that a concerned parent can us to help improve his or her child's reading and writing skills

*May 12, 2011*

**Physics**

explain the concept of electric potential difference in terms of work done in transferring the charge

*April 13, 2011*

**Chemistry I**

If the theoretical yield of a reaction is 0.173g and the actual yield is 0.165g , what is the percent yield?

*April 9, 2011*

**Statistics**

A computer manufacturer is about to unveil a new, faster personal computer. The new machine clearly is faster, but initial tests indicate there is more variation in the processing time. The processing time depends on the particular program being run, the amount of input data, ...

*March 25, 2011*

**Physics**

A patient has a far point of 34.6 cm and a near point of 26.0 cm. What power (in diopters) should be prescribed to give the patient normal vision for: (a) contact lenses? 1) D (b) glasses which are worn 0.9 cm away from the patient's eyes? 2) D

*February 14, 2011*

**management**

Given the following amount of work in seconds required at each station: _____________________ A 38 J 32 X 22 B 34 K 30 Y 18 C 35 L 34 Z 20 a. What is the possibility daily output of this “process” if 8 hours of processing time is available each day?

*January 30, 2011*

**4th grade math**

you find out

*January 10, 2011*

**4th grade math**

help!

*January 10, 2011*

**4th grade math**

53

*January 10, 2011*

**4th grade math**

thank you

*January 10, 2011*

**criminal justice**

what are 2 major influencing factors and how dose federal sentencing guidelines have an effect on these influences

*November 30, 2010*

**chemistry**

what is the molecular mass of a solute if a solution containing 150 g of that solute and 1.0 kg of water has a boiling point of 102.0 degree c? (Kb= 0.512 degree C/m)

*November 28, 2010*

**Math**

there are a lot of them but i chose 1, 4, 8,10

*November 15, 2010*

**physics**

A long jumper jumps with the initial velocity of 12.0 m/s at an angle of 20 degrees. what is the displacement of x?

*November 5, 2010*

**Pearson**

0.0195

*November 4, 2010*

**math**

The carpenter wants to make a dresser based on the dollhouse furniture. The scale is 5\2in : 1ft. The height of the dollhouse is 10in. What is the height of the carpenter's dresser.

*November 3, 2010*

**math**

A building 35ft tall casts a shadow 105ft long .Patty casts a shadow 16.5 ft long. how tall is Patty?

*November 3, 2010*

**math**

thank you !!!

*November 3, 2010*

**math**

A fence post 3ft tall casts a shadow 16ft long . At the same time ,the barn casts a shadow 96ft long. how tall is the barn?

*November 3, 2010*

**calculus**

Find the formula for the described function and state its domain. An open rectangular box with a volume of 8 cubic meters has a square base. Express the surface area of the box as a function of S(x) of the length x of a side of the base.

*October 27, 2010*

**algebra**

what is the average height of a softball that is pitched to a batter from 45 feet away?

*October 19, 2010*

**5th grade SCIENCE**

Why is a short curcuit called a short curcuit?

*October 18, 2010*

**Math**

The answer according to the calculator is 15.What I think the answer is 45.

*October 18, 2010*

**Chemistry**

If 920 mL of 0.0402 M aqueous LiOH reacts stoichiometrically according to the balanced equation, what mass (g) of gaseous CO2 is required? 2 LiOH(aq) + CO2(g) → Li2CO3(aq)

*September 28, 2010*

**chemistry**

How many {\rm NO}_{2} molecules would form as products if the reaction had a percent yield of 75\%?

*September 20, 2010*

**college physical science**

jdjdj

*September 6, 2010*

**math**

t over 30

*September 1, 2010*

**geometry**

How much foil is required to cover a rectangular box that is 4in. by 8in. by 5in.? use 3.14 as an aproximation for pi. where appropriate.

*July 17, 2010*

**geometry**

in triangle abc angle b is 3 times angle a and angle c is 8degrees less than 6 times angle a?

*July 6, 2010*

**Geometry**

A regular hexagon is made from equilateral triangle by cutting along the dotted lines and removing the three smaller triangles. if triangle has a perimeter of 18, what is the perimeter of hexagon?

*June 10, 2010*

**english**

underline complete subject and complete pedicate to my sentences. The boys and girls studied different kinds of measures.

*May 26, 2010*

**Geometry**

Lines l and m have an intersection at point O and any reflection in l followed by a reflection in m results in a rotation about point O of 136 degrees. What is the acute angle between l and m? Thank you!!

*May 15, 2010*

**Chemistry**

1.61 hours

*April 18, 2010*

**math**

how to work out the answer to 0.08 divided by 0.7, it dividing decimals

*April 16, 2010*

**Physics**

Two Q = +6.72 mC charges are placed at opposite corners of a square d = 1.5 m on each side, and -Q = -6.72 mC charges are placed at the remaining corners, as shown in the figure. Q___________-Q | | | | | | | | -Q__________Q

*April 8, 2010*

**6th grade**

what is the LCM of 8,and 19

*March 25, 2010*

**physics**

n a physics lab experiment, a spring clamped to the table shoots a 21 g ball horizontally. When the spring is compressed 20 cm , the ball travels horizontally 5.2 m and lands on the floor 1.5 m below the point at which it left the spring.

*March 23, 2010*

**physics - PLEASE HELP**

A person whose eyes are H = 1.62 m above the floor stands L =2.24m in front of a vertical plane mirror whose bottom edge is 43 cm above the floor. What is the horizontal distance x to the base of the wall supporting the mirror of the nearest point on the floor that can be seen...

*March 8, 2010*

**physics**

A piano tuner hears one beat every 2.8 s when trying to adjust two strings, one of which is sounding 440 Hz, so that they sound the same tone. How far off in frequency is the other string?

*February 10, 2010*

**accounting**

what is the quality of the disclosures for guarantees and commitments for nortel networks corporation? and could these disclosures be improved?

*January 29, 2010*

**Physics - Momentum**

A ball of mass m makes a head-on elastic collision with a second ball (at rest) and rebounds with a speed equal to one-third its original speed. What is the mass of the second ball?

*December 10, 2009*

**Physics - Momentum**

A child in a boat throws a 5.60 kg package out horizontally with a speed of 10.0 m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 22.0 kg and that of the boat is 55.0 kg.

*December 9, 2009*

**MATH**

Joe bought 2 dozen eggs at the store. On the way he dropped the eggs and broke 3/4 of them. How many eggs broke?

*December 8, 2009*

**MATH**

Carmen spent 4 hours at the Y on Saturday. Two thirds of that time she spent in the gym. How many hours did she spend in the gym?

*December 8, 2009*

**home economics**

what are ten careers in home economics

*December 4, 2009*

**Physics Work and Energy**

A 55 kg trampoline artist jumps vertically upward from the top of a platform with a speed of 5.5 m/s. (Ignore small changes in gravitational potential energy.) (a) How fast is he going as he lands on the trampoline, 3.0 m below? (b) If the trampoline behaves like a spring of ...

*November 23, 2009*

**Physics - Work and Energy**

Jane, looking for Tarzan, is running at top speed (3.6 m/s) and grabs a vine hanging vertically from a tall tree in the jungle. How high can she swing upward? Does the length of the rope matter?

*November 16, 2009*

**accounting**

Question 2.) Hawkeye Electric Company engaged in the following transactions during July. July 2 – Purchased inventory for cash, $800 July 5 – Purchased store supplies on credit terms of net eom, $600. July 8 – Purchased inventory of $3,000, plus freight charges ...

*November 11, 2009*

**phyics-universal gravity**

Calculate the force of gravity on a spacecraft 6400 km (1 earth radii) above the Earth's surface if its mass is 1600 kg.

*November 3, 2009*

**Pre- Caluculus**

Find the time at which the depth of the water in the tank is eual to half its initial depth. D(t)=sqrt(100-2t) the tank is empty when t=50 min

*October 21, 2009*

**social studies**

What is the province of Charlottetown Canada?

*October 14, 2009*

**physics**

A window washer pulls herself upward using the bucket-pulley apparatus. The mass of the person plus the bucket is 69 kg.How hard must she pull downward to raise herself slowly at constant speed?If she increases this force by 11 percent, what will her acceleration be? There is ...

*October 13, 2009*

**Physics**

okay well i am confused about the way you can figure out the acceleration if the tension is increased by 11%

*October 13, 2009*

**Physics**

no since there is only one pulley then there is only one rope and if there is only one pulley and one rope there is only one tension

*October 13, 2009*

**Physics**

to get T would you just do 69(9.8)

*October 13, 2009*

**physics**

A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.15 and the push imparts an initial speed of 3.9 m/s?

*October 13, 2009*

**physics**

A box weighing 69 N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end. Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley weighs one of the following: a)...

*October 8, 2009*

**Physics - HELP please**

A 24.0 kg box (m1) rests on a table.(b) A 13.0 kg box (m2) is placed on top of the 24.0 kg box, as shown in Fig. 4-35. Determine the normal force that the table exerts on the 24.0 kg box. Determine the normal force that the 24.0 kg box exerts on the 13.0 kg box.

*October 8, 2009*

**Physics - HELP please**

A 24.0 kg box (m1) rests on a table.(b) A 13.0 kg box (m2) is placed on top of the 24.0 kg box, as shown in Fig. 4-35. Determine the normal force that the table exerts on the 24.0 kg box. Determine the normal force that the 24.0 kg box exerts on the 13.0 kg box.

*October 8, 2009*