Thursday

October 23, 2014

October 23, 2014

Total # Posts: 129

**Related rates math in calculus**

A square sheet of cardboard has sides 18cm. Four equal portions are cut away from the corner and discard. The sides are then twiced up to form a restangular box. What are the dimension of the box formed that will have max volume?
*August 22, 2014*

**Science**

Earth travels around the sun at a spreed of 30,000 meters per second. Express this in kilometers per hour.
*May 15, 2014*

**grammar**

Future
*March 25, 2014*

**MATH**

Could you please check? j+18 = 2(j-92-18) j=128 Checking 128+18= 2*128-110 146= 36 ???? it does not make sense
*January 26, 2014*

**MATH**

Jim had 92 more marbles than Sam. After Sam gave Jim 18 marbles, Jim had twice as many marbles as Sam. How many marbles did Jim have at first?
*January 26, 2014*

**MATHS**

Thank you Ms. Sue :)
*January 26, 2014*

**Biology 101 **

1. Which of the following statements is incorrect about homologous chromosomes? a. Homologous chromosomes are similar but not identical b. Homologous chromosomes have the same size and function c. Homologous chromosomes contain genes for the same kind of protein products d. ...
*October 23, 2013*

**trig identites**

since sin2x+√3cos2x=2sin(2x+60) find the general solution for the equation sin2x+√3cosx=0 thank you
*May 10, 2013*

**Math**

a group of students ate a whole pie each student ate exactly 1/5 of the pie how many students shared the pie
*April 15, 2013*

**physics**

thanks!
*November 27, 2012*

**physics**

A scuba diver must decompress after a deep dive to allow excess nitrogen to exit safely from his bloodstream. The length of time required for decompression depends on the total change in pressure that the diver experienced. Find this total change in pressure for a diver who ...
*November 27, 2012*

**Chemistry**

A carbon atom is bombarded by high energy photons with a wavelength of 40 nm. Find how many electrons are ejected and the velocity of the first electron.
*November 11, 2012*

**College Calc**

Problem: y=sqrtx ^1/x. Find DY/DX. ln(f(x))=lnx^1/2x or lnx to the 1/2x 1/2x lnx product rule (1/4x^2)(lnx)+(1/x)(1/2x) is the product rule correct? What do i do after this product rule?
*October 18, 2012*

**college math **

Find the measures of angles 1 through 5 in the figure shown. if the angles are 78 degrees and 42 degrees.
*September 29, 2012*

**education**

Webbing Is A. Teacher created duck theme for classroom B.way to capitalize on children's ideal without enforcement a point to view on them c.planning tool that provides deputy to a topic and creates a map of possible activities and projects d. Technique to ask ...
*September 22, 2012*

**education**

Behavioral objectives clearly stated A. What the children will actually do B. How children should behave C. What children are interested D.the range of normal behavioral for children
*September 22, 2012*

**Math**

How do I find the unit rate for 17 ounces for $5.00?
*September 18, 2012*

**Learning**

Tom has difficulty battling distractions while studying. Which of the following strategies would help him with this problem? A. Taking notes that keep him focused. B. Improving his study environment. C. Adding positive messages to his study area. D. Both B and C.
*August 7, 2012*

**intermediate accounting**

explain impotnce of review of accounting cycle
*June 18, 2012*

**grammar**

Since we had worked like humans for 8 hours, we finally put a lid on it at 6:00 p.m.
*May 17, 2012*

**life orientation**

CANCER
*May 7, 2012*

**physics**

When you increase the number of turns in a coil to induce more voltage, you do which of the following?. A) only get more voltage if the resistance of the larger coil remains unchanged.B) None of the above.C) do more work to induce the greater voltage.D) really do get "...
*April 17, 2012*

**physics**

What is the key ingredient for electromagnetic induction? A) Motion.B) Energy.C) Force.D) Magnetic charge.E) Electric charge.
*April 17, 2012*

**physics**

When you increase the number of turns in a coil to induce more voltage, you do which of the following?. A) only get more voltage if the resistance of the larger coil remains unchanged.B) None of the above.C) do more work to induce the greater voltage.D) really do get "...
*April 15, 2012*

**physics**

Which of these is not an application of electromagnetic induction? A) Radio.B) None of these.C) Sound.D) Light.E) All of these are
*April 15, 2012*

**physics**

In any region of space where a magnetic field is changing in time, there is which of these?. A) None of these.B) induced electric field, also changing in time.C) All of these.D) even larger magnetic field.E) induced gravitational field.
*April 15, 2012*

**physics**

In any region of space where a magnetic field is changing in time, there is which of these?. A) None of these.B) induced electric field, also changing in time.C) All of these.D) even larger magnetic field.E) induced gravitational field.
*April 14, 2012*

**physics**

Which of these is not an application of electromagnetic induction? A) Radio.B) None of these.C) Sound.D) Light.E) All of these are.
*April 14, 2012*

**principles of physics**

is this motion
*April 14, 2012*

**principles of physics**

What is the key ingredient for electromagnetic induction? A) Motion.B) Energy.C) Force.D) Magnetic charge.E) Electric charge.
*April 14, 2012*

**Business math**

Beth earns $3450 monthly, she is married and claims two exemptions. Find the FIT withheld from her montly check using the percentage method. I have: 2(195.83)= 391.66 3450-391.66 = 3058.34 0.15(3058.34-517) 0.15(2541.34)= $381 Stacy is single and claims one exemption earning $...
*March 2, 2012*

**Physics**

A vibration platform oscillates up and down with an amplitude of 10.2 cm at a controlled variable frequency. Suppose a small rock of unknown mass is placed on the platform. At what frequency will the rock just begin to leave the surface so that it starts to clatter?
*February 19, 2012*

**College Physics**

An artificial satellite is moving in a circular orbit with a speed of 6.5 km/s and a period of 80.0 min. A retarding rocket fires in a direction opposite to the motion. This provides a retarding deceleration of 21.0 m/s2. What is the acute angle between the radius vector and ...
*February 11, 2012*

**Physics**

john and Sarah participated in a roller skating show. while 75kg john skated backwards at 3.00m/s, 60kg Sarah jumped into his arms with a velocity of 5m/s in the same direction. a. how fast did the pair roll backwards together? b. if john instead skated toward sissy when she ...
*December 1, 2011*

**social studies**

when did president nixon get impeached
*November 26, 2011*

**algebra**

simplify by collecting like terms if possible 7sqrt20-8sqrt5
*November 13, 2011*

**math**

Gloria talked on her cell phone for 320 minutes the first month, 243 minutes the second month and 489 minutes the third month.Her payment package does not allow her to pay per minute;she can only buy packages.If she has to pay $25 for every 200 minutes,how much did she pay for...
*November 9, 2011*

**Organic chemistry**

(i) write a proton transfer reaction that may occur, using curved arrows to show electron movements. (ii) write the pKa of the most acidic H on each side of the equation (iii) State whether reactants or products are favored and by how much (A) Phenol + sodium ethoxide (B) ...
*October 9, 2011*

**physics**

A 1340 kg car is traveling with a speed of 15.0 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 51.5 m?
*September 14, 2011*

**algebra**

for a given performance, 4 1/4 times as many tickets were sold as there were seats. If 5100 tickets were sold, how many could be seated in the auditorium?
*August 21, 2011*

**geometry**

In thea diagram,ABCD is a trapezium with AB,DC and vertices A(-4;1),B(x;-3),C(1;y) and D.Determine the value of x if the distance AB is 5 units.
*July 29, 2011*

**Algebra**

Is there another way 2 think about this problem?
*July 26, 2011*

**science**

Is filtered water unhealthy for my fish because the electrolytes have been removed in the process?
*July 26, 2011*

**Math Statistics**

Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. Student's grades - A, B, or C, on a test.
*June 26, 2011*

**Geometry**

Triangle DEF is an isosceles triangle with DE = FE. If DE = 5 and ÚD = 75 degrees: what is the length of FE, the measure of angle F, and the measure of angle E? E D ∆ F
*June 16, 2011*

**Geometry**

I have a picture of a window showing a square in the center with sides measuring 4 feet, over each side of the square is a semi-circle(a total of 4 semi-circles), how can I find the area of the window? Should I find the area of the square and the semi-circles and add them ...
*June 15, 2011*

**Geometry**

The area of a square is 121 sq feet. What is the length of its sides? Would I find this by dividing 121 by 4?
*June 15, 2011*

**history**

what did thomas alva edison invent?
*June 13, 2011*

**Statistics**

A bag contains 8 red marbles, 3 blue marbles, and 2 green marbles.
*June 8, 2011*

**Elementary Statistics**

A class consists of 39 woman and 42 men. If a student is randomly selected, what is the probability that the student will be male?
*June 8, 2011*

**grammar **

is oi like in point long sound or short sound?
*May 27, 2011*

**science**

why is the root the first part of a plant to grow?
*May 26, 2011*

**Statistics**

Find the regression line for this data set. x y 0 23 2 27 2.3 29 4.1 32 5 35
*May 20, 2011*

**algebra**

Miranda's financial aid stipulates that her tution not exceed $1500. If her college charges a $45 registration fee plus $ 425 per course4, what is the greatest number of courses for which Miranda can register?
*May 20, 2011*

**Anatomy**

The change in the number of olfactory neurons as we age increase the detection of warning smells
*May 15, 2011*

**Statistics**

Find the population standard deviation for the data set? 1, 2, 3, 5, 6, 7
*May 14, 2011*

**Math**

Suppose the mean heights of a population are 72 inches with a standard deviation of 2 inches. What height (x) corresponds to the z value of 1
*May 14, 2011*

**chem**

2.5g X 1mol MgI2/ molar mass = mol MgI2 Molarity= mol of solute/ volume of solution (in L)
*April 24, 2011*

**Chemistry**

Thank you so much DrBob! I ended up with 469.5Tf = 8122.54 Tf = 17.3 Thanks again, -Phil
*April 24, 2011*

**Chemistry**

I'm having trouble once i get to T(final)=-14.998 X T(final) + 14.998 X T(initial h2o) + T(initial Al) Any suggestions?
*April 24, 2011*

**Chemistry**

A 32.5g cube of aluminum initially at 45.8 C is submerged into 105.3g water at 15.4 C. What is the final temp of both substances at thermal equilibrium. Assume the al and the H2O are thermally isolated from everything else) Specific heat cap Al= .903 Specific heat cap H2O= 4....
*April 24, 2011*

**math**

what is 34 multiply 56?
*March 8, 2011*

**ENGLISH**

What are words with the ending shion except cushion and fashion?
*March 8, 2011*

**Physics**

If a bird moves with an initial velocity of 30secs and accelerates at the rate of 40m/s to cover a distance of 70km/hrs.Calculate the final velocity of the bird?
*March 3, 2011*

** Urgent!!! Physics**

A)2.86x10^5 B)-6.74x10^-4 C)Who Cares D)WTF?
*January 26, 2011*

** Urgent!!! Physics**

A)2.86x10^5 B)-6.74x10^-4
*January 26, 2011*

**Math**

I'm also getting 100pi
*January 18, 2011*

**Integrated Physics and Science**

IMA is unitless
*January 10, 2011*

**Physics**

Question contains pictures: h t t p : / / g o o . g l / M H k y 1 (delete the spaces between the characters for the URL)
*November 16, 2010*

**Physics**

(Delete the spaces between the characters for the URL of the question): h t t p : / / g o o . g l / E 9 M X o
*November 9, 2010*

**physics**

At a time when mining asteroids has become feasible, astronauts have connected a line between their 3640 kg space tug and a 6500 kg asteroid. Using their ship's engine, they pull on the asteroid with a force of 490 N. Initially the tug and the asteroid are at rest, 500 m ...
*November 1, 2010*

**Physics**

The escalator that leads down into a subway station has a length of 28.5 m and a speed of 1.6 m/s relative to the ground. A student is coming out of the station by running in the wrong direction on this escalator. The local record time for this trick is 11 s. Relative to the ...
*October 16, 2010*

**Chemistry**

It takes about 10^16 years for just half the samarium-149 in nature to decay by alpha-particle emission. Write the decay equation, and find the isotope that is produced by the reaction.
*July 14, 2010*

**1st grade**

5 ways in which the human or environmental problem impacts on the community
*April 27, 2010*

**Pre-Calc (exponential growth)**

A COLONY OF BACTERIA IS GROWN UNDER IDEAL CONDITIONS IN A LAB SO THAT THE POPULATION INCREASES EXPONENTIALLY WITH TIME. At the end of the three hours, there are 10,000 bacteria. At the end of the 5 hours, there are 40,000 bacteria. How many bacteria were present initially? I ...
*March 28, 2010*

**Precalc Repost**

Hello, I'm trying to figure out how to do this problem, but don't know where to begin. I think some information is missing. Blood Pressure: The function P=120+30Sin 2pi(t) models the blood pressure (in millimeters of mercury) for a person who has a high blood pressure...
*March 7, 2010*

**pre-calc**

Hello, I'm trying to figure out how to do this problem, but don't know where to begin. I think some information is missing. Blood Pressure: The function P=120+30Sin 2pi(t) models the blood pressure (in millimeters of mercury) for a person who has a high blood pressure ...
*March 7, 2010*

**math**

26 mins x 60 secs/1 min = 26x60 secs= 1560 secs
*March 3, 2010*

**math**

A cylindrical jar with height 8 inches and diameter 6 inches is filled to 75% capacity with juice. The juice is then poured into another cylindrical container with a 10 inch diameter and height of 4 inches. a. to what percent of its capacity is the second container filled with...
*February 25, 2010*

**math**

The Mustangs and the Bruins play in a basketball tournament. The team that first wins three games wins the tournament. Assuming ties are not possible, find the number of possible ways in which the tournament can occur. I feel like there is not enough information. Can you help?
*February 25, 2010*

**math**

ahhhhhh thanks!
*February 25, 2010*

**math**

The numbers -3, -4, and 6 are used once and substitued at random for a, b, and c in the equation ax+b=c. What is the probability that x turns out to be negative. I'm not sure where to begin with this. Can you help?
*February 25, 2010*

**Pre Calc**

Oh so there is something wrong with the problem! Thanks
*February 12, 2010*

**Pre Calc**

To determine the height of the Louisiana-Pacific (LP) Tower, the tallest building in Conroe, Texas, a surveyor stands at a point on the ground, level with the base of the LP building. She measures the point to be 320ft from the building's base and the angle of elevation to...
*February 12, 2010*

**9th Grade Math**

Very Good!
*February 12, 2010*

**9th Grade Math**

Ok, well you need a system of equations. 5x+3.50y=2265 x+y=543 x=543-y 5(543-y)+3.50y=2265 solve for y and substitute in other equation to solve for x can you take it from here?
*February 12, 2010*

**math repost**

1. What is the exact value of csc^2 210degrees - cot^2 210degrees? 2. Can you make a generalization about the value of csc^2 theta - cot^2 theta? I'm not sure what to do, I'm familiar with the terms but not sure how to go about solving the question.
*February 11, 2010*

**Math**

What is the exact value of csc^2 210degrees - cot^2 210degrees? Can you make a generalization about the value of csc^2 theta - cot^2 theta? I'm not sure what to do, I'm familiar with the terms but not sure how to go about solving the question.
*February 11, 2010*

**literary**

what are t he five propagandas
*December 10, 2009*

**AP Physics - Static Equilibrium**

I still don't know get to set up how to solve for the forces of the hands/feet if you don't know their distinct masses and only have the center of mass...
*November 27, 2009*

**AP Physics - Static Equilibrium**

I thought W was the center of mass? Also, are you saying to use moment of inertia I to solve, and if so, how would I set up the equations? I'm not good at equilibrium problems.
*November 27, 2009*

**AP Physics - Static Equilibrium**

A man doing push-ups pauses in the position shown in the figure. His mass is 75-kg. Determine the normal force exerted by the floor on each hand and on each foot. img145.imageshack.us/img145/7130/picture1n.png (copy into url bar) a = 40 cm b = 95 cm c = 30 cm W = mg = 735 N I ...
*November 27, 2009*

**College mechanic vibration**

A half-car model of an automobile suspension system is shown below. You are to design its suspension systems (values of spring constants and damping constants). Generally, for ride comfort, it is desired to have the bounce motion at low frequency and the pitch motion at ...
*October 25, 2009*

**Physics**

The diameter of the Moon is 3480km. What is the volume of the Moon? How many Moons would be needed to create a volume equal to the Earth? How do you find the volume of the Moon from just the diameter? Also, does anybody know how to figure out the volume of the Earth?
*August 11, 2009*

**Physics Measurements**

So far I've gotten that the volume is 333.3 (repeating) Liters, but I don't understand how to determine the dimensions based on that.
*August 11, 2009*

**Physics Measurements**

How big is a ton? That is, what is the volume of something that weighs a ton? To be specific, estimate the diameter of a 1-ton rock, but first make a wild guess: will it be 1ft across, 3ft, or the size of a car? [Hint: Rock has mass per volume about 3 times that of water, ...
*August 11, 2009*

**Engineering**

Based on the following labor/material/costs/revenue structure, develop a production plan to maximize profit. You have 40 hours per week at the shown rate at each position type and can plan on 15% additional hours at overtime rates of 150%. You have room for a total of 8 ...
*April 19, 2009*

**Funky Lens Problem**

img14.imageshack.us/my.php?image=funkylensproblem.tif
*March 10, 2009*

**calculus**

A MANUFACTURE OF LIGHTBULBS HASS SAMPLED 40 BULBS IN ORDER TO DETERMINE THE POPULATION MEAN LIFE OF THE BULBS. tHE SAMPLE MEAN WAS 1200 HOURS WITH A STANDARD DEVIATION OF 100. tHE MANUFACTURER WOULD LIKE TO KNOW, WITH 95% CONFIDENCE, THE INTERVAL VALUES FOR THE POPULATION MEAN.
*February 27, 2009*

**Physics - Buoyant Force**

I'm confused about the "1 g gravitational field". What's the 1 g referring to and why is it 1 g?
*December 16, 2008*