Monday

July 6, 2015

July 6, 2015

Total # Posts: 290

**Algebra**

The time, t, required to drive a certain distance varies inversely with the speed, r. If it takes 12 hours to drive the distance at 60 miles per hour, how long will it take to drive the same distance at 85 miles per hour? A. About 7.08 hours B. About 5.00 hours C. About 1.42 ...
*June 2, 2015*

**algebraic modeling**

A toy manufacturer determines that the daily cost,C, for producing x units of a dump truck can b approximated by the function c(x)=0.005x^2-x+109 I got that the manufacturer must produce 100 units per day... What is the minimum daily cost?
*May 13, 2015*

**math**

Why Was the Engineer Driving the Train Backwards?
*March 27, 2015*

**chemistry**

Thank a bunch
*March 13, 2015*

**chemistry**

What volume of 0.050 M AgNO3, silver nitrate solution is required to reat completely with 60.0 mL of 0.025 M K2S, potassium sulfide?
*March 13, 2015*

**math -hw help**

Determine whether the following regular tetrahedrons have an edge length that is a whole number, a rational number or irrational number. The surface are of a tetrahedron is given by the equation: SA = √ 3s^2 Surface are of regular tetrahedron A = 1.5 Surface are of ...
*February 5, 2015*

**English**

Bri, Austin's last post was correct?
*January 26, 2015*

**math (factors and products)**

How could you use an area model to identify the binomial factors of a trinomial?
*January 22, 2015*

**Math**

How could you use an area model to identify the binomial factors of a trinomial?
*January 21, 2015*

**physics**

A soccer ball is kicked with an initial horizontal velocity of 16.5 m/s from a 92 meter high cliff. Determine the time it took the ball to reach the ground and how far the ball got from the edge of the cliff.
*December 16, 2014*

**Algebra2**

log2(x+8)-log2(5)=4
*November 20, 2014*

**arithmetic**

If you have 3 cups of pineapple juice and, how many total cups of punch can you make? Table: Ginger Ale - 40% OJ 25% Pineapple juice 20% Sorbet 15
*November 3, 2014*

**Math**

Write a word phrase for this algebraic expression. 6.5-h
*October 28, 2014*

**Physics(Science)**

Waves on a 5.0 m rope travel at a speed of 92 m/s. If the tension in the rope is 497 N, what is the mass of the rope?
*October 26, 2014*

**elementary**

Magic square 13.6
*September 17, 2014*

**Physics**

A dart is thrown horizontally with an initial speed of 14 m/s toward point P, the bull's-eye on a dart board. It hits at point Q on the rim, vertically below P, 0.19 s later. (a) What is the distance PQ? (b) How far away from the dart board is the dart released?
*September 14, 2014*

**English**

how do I start an Auto Biography? I mean what sentence should i start it with?
*September 6, 2014*

**MATH HELP!!**

Thank you very much!
*August 20, 2014*

**MATH HELP!!**

Thank you,also can you explain and the number that it would make please
*August 20, 2014*

**MATH HELP!!**

SID WROTE 541,309 ON HIS PAPER. USING NUMBERS AND WORDS EXPLAIN HOW THE NUMBER WOULD CHANGE IF HE SWITCHED THE DIGITS IN THE HUNDRED THOUSANDS AND TENS PLACES
*August 20, 2014*

**cOLLEGE mAJORS**

ACCOUNTING VS IT WHICH IS HARDER? WHICH IS EASIER?
*August 12, 2014*

**math**

2^5/2 - 2^3/2
*August 9, 2014*

**Physics**

You are standing on a fish pond wishing to catch a fish. How would you aim your fish gun in order to catch a fish which your eyes could see 20 cm below the surface of water ? will u aim higher , lower or exactly on the location of the fish as seen by your eyes ? find out what ...
*July 27, 2014*

**Grammar**

Before the items that are complete sentences, write S. Before those that contain fragments, write F. Before a run on sentence, write RS. 1. We often walk through the woods, picking berries and listening to the birds. Is this a run on sentence?
*July 2, 2014*

**math**

how can i plot values in a parabola graph if the values are fractions. it's my first time with this things so i don't understand
*May 3, 2014*

**Science**

All correct!
*March 4, 2014*

**english**

9 - C. 10 - C. Not sure about this one. 11 - C. 12 - C. 13 - A. Not sure about this one either. 14 - D. 15 - C. 16 - A. 17 - A. I'm pretty sure most of these are right.
*February 5, 2014*

**english**

I'm doing the test now if you still need answers.
*February 5, 2014*

**Math**

If I has plots of (3,2) and (8,6) how would I find the area in square units
*January 29, 2014*

**Physics**

A firefighter of mass 73 kg slides down a vertical pole with an acceleration of 5 m/s2. The acceleration of gravity is 10m/s2. What is the friction foce that acts on him? Answer in units of N
*January 7, 2014*

**Spelling**

Wordly wise 3000 book 7 lesson 7c vocab answers?
*December 17, 2013*

**Science**

Uranium-238 is less stable than oxygen-16. What accounts for this difference? (A) Uranium is a solid, while oxygen is a gas. (B) Unlike oxygen-16, uranium-238 has a nucleus in which repulsive electric forces surpass the strong nuclear forces. (C) Oxygen-16 has fewer electrons ...
*November 20, 2013*

**math**

9 ft
*October 15, 2013*

**Math**

If sin(x) = 1/3 and sec(y) = 29/21 , where x and y lie between 0 and π/2, evaluate the expression using trigonometric identities. (Enter an exact answer.) cos(2y)
*September 23, 2013*

**English**

What type of clause or phrase is italicized in the sentence below? The play, a three-act farce, amused everyone.
*September 23, 2013*

**math **

Pat worked 43 hours and received $7.25 per hour for regular pay and time-and-a-half for all hours over 40 hours. What were her weekly earnings?
*September 6, 2013*

**physics**

The drawing shows a uniform horizontal beam attached to a vertical wall by a frictionless hinge and supported from below at an angle θ = 38o by a brace that is attached to a pin. The beam has a weight of 346 N. Three additional forces keep the beam in equilibrium. The ...
*July 16, 2013*

**math**

what is missing number for magic square for 22, 111,72, 131
*July 9, 2013*

**algebra 1**

Graph each rational function;identify the domain and ranges;and compare the graph with the graph y=1/x. 1.y=-10/x 2.y=1/(x+3)+3
*April 24, 2013*

**algebra 1**

Graph each rational function;identify the domain and ranges;and compare the graph with the graph y=1/x. 1.y=-10/x 2.y=1/(x+3)+3
*April 24, 2013*

**calculus**

the telephone company is planning to introduce two new types of executive communications systems that it hopes to sell to its largest commercial customers. It is estimated that if the first type of system is priced at x hundred dollars per system and the second type at y ...
*April 23, 2013*

**Science**

What are some of the effects of the sun's radiation on the earth's atmosphere including the green house effect, conduction, convection and radiation?
*April 10, 2013*

**math**

32 subjects in a study were recruited by advertisements to participate in a study of attitudes and values toward wine. What assumption are you making about these subjects? (I noticed that the problem does not state it is a SRS.)
*April 3, 2013*

**Science**

Describe the apparent motion of the stars and planets that is caused by the revolution and rotation of the earth.
*March 11, 2013*

**math**

where did you get the 2 from ?
*March 1, 2013*

**English**

(Choose the correct answer) i hope/wish i was a bird
*February 28, 2013*

**Chemistry**

two D-glucose monosaccharide units
*December 16, 2012*

**Trigonometry**

Please show me the work so i understand 2. Find the reference angle of -11π/3. 5. If θ = –18°, find the exact value of θ in radians. 6.If θ = 3, find the value of θ in degrees correct to the nearest tenth of a degree. 13.The ...
*December 12, 2012*

**Chemistry**

pls. tell
*November 28, 2012*

**sci**

a car performs 40,000 j of work in 5 sec. what is the power of the car. what is the horsepower?
*November 16, 2012*

**trig**

the pendulum of a grandfather clock is 1.3m long. Determine the length of the arc through which the pendulum moves if it moves through an angle of 15
*November 8, 2012*

**Microecon**

Using the midpoints approach to the cross elasticity of demand-calculate the cross eleasticity the demand for golf at all 3 prices. Price Demand1 D2 D3 50 15 10 15 35 25 15 30 20 40 20 50 D1 -Income $50k per yr, movies $9 D2 -Income $50k -movies $11 D3 -Income $70k -movies $11...
*November 1, 2012*

**Physics**

A current of 4 A flows in a copper wire 10 mm in diameter. The density of valence electrons in copper is roughly 9 × 1028 m−3. Find the drift speed of these electrons. Answer in units of m/s.
*November 1, 2012*

**Physics**

A 63 Ω resistor is connected to a 4.7 V battery a) When the switch is closed, calculate the current I. Answer in units of A. A 7.4 Ω resistor is connected to a 4.7 V battery When the switch is closed, calculate the current I. A 69 Ω resistor is connected to a 4....
*November 1, 2012*

**Physics**

A certain lightbulb has a tungsten filament with a resistance of 28 Ω when cold and 144 Ω when hot. If the equation R = R0 [1 + α ∆T ] can be used over the large temperature range involved here, find the temperature of the fila- ment when it is hot. Assume...
*October 31, 2012*

**physics**

A typical color television draws about 2.8 A when connected to a 145 V source. What is the effective resistance of the T.V. set? Answer in units of Ω.
*October 31, 2012*

**Physics**

A wire with a circular cross section and a resistance R is lengthened to 3.77 times its original length by pulling it through a small hole. After being pulled through the hole, the total volume of the wire is unchanged. Find the resistance of the wire after it is stretched. ...
*October 31, 2012*

**Physics**

A skyrocket explodes 77 m above the ground. Three observers are spaced 106 m apart, with observer A directly under the point of the explosion. Find the ratio of the sound intensity heard by observer A to that heard by observer B. Find the ratio of the intensity heard by ...
*October 21, 2012*

**Physics**

An experiment requires sound intensity 0.942 W/m2 at the distance of 2.7 m in any direction from a speaker. What total sound power is required? Answer in units of W.
*October 21, 2012*

**Physics**

A baseball coach shouts loudly at an umpire standing 3.6 meters away. If the sound power produced by the coach is 2.2×10−3 W, what is the intensity of the sound when it reaches the umpire? Answer in units of W/m2.
*October 21, 2012*

**Physics**

A harmonic wave in a wire has amplitude A = 7.6 mm, wavelength λ = 0.679 m and frequency f = 543 Hz. What is the propagation speed of the wave? Answer in units of m/s. The wire has linear mass density of 5.04 g/m. Determine the wire’s tension. Answer in units of N.
*October 21, 2012*

**Physics**

A harmonic wave is traveling along a rope. It is observed that the oscillator that gener- ates the wave completes 44.9 in 30.4 s. Also, a given maximum travels 436 cm along the rope in 9.4 s. What is the wavelength? Answer in units of cm
*October 21, 2012*

**Physics**

When a particular wire is vibrating with a frequency of 5.3 Hz, a transverse wave of wavelength 69.3 cm is produced. Determine the speed of wave pulses along the wire. Answer in units of m/s.
*October 21, 2012*

**Physics**

The time needed for a water wave to change from the equilibrium level to the crest is 0.4185 s. What fraction of a wavelength is this? What is the period of the wave? Answer in units of s. What is the frequency of the wave? Answer in units of Hz.
*October 21, 2012*

**Physics**

Beth, a construction worker, attempts to pull a stake out of the ground by pulling on a rope that is attached to the stake. The rope makes an angle of 60.9 ◦ with the horizontal. If Beth exerts a force of 116 N on the rope, what is the magnitude of the upward component ...
*October 21, 2012*

**physics**

A gazelle is running in a straight line (the x-axis). The graph in the figure (Figure 1) shows this animal's velocity as a function of time. During the first 12.0 , find the total distance moved
*October 9, 2012*

**Physics**

A variable-length air column is placed just below a vibrating wire that is fixed at the both ends. The length of air column open at one end is gradually increased from zero until the first position of resonance is observed at 20 cm. The wire is 115.4 cm long and is vibrating ...
*October 5, 2012*

**Physics**

A length of organ pipe is closed at one end. If the speed of sound is 344 m/s, what length of pipe is needed to obtain a funda- mental frequency of 70 Hz? Answer in units of m.
*October 5, 2012*

**Physics**

The length of a string is 344 cm. The string is held fixed at each end. The string vibrates in two sections; i.e., the string has two antin- odes, and the string vibrates at 130 Hz. Find the wavelength. Answer in units of m. What is the fundamental frequency? Answer in units ...
*October 5, 2012*

**Physics**

To demonstrate standing waves, one end of a string is attached to a tuning fork with frequency 120 Hz. The other end of the string passes over a pulley and is connected to a suspended mass M, as shown. The value of M is such that the standing wave pattern has eight loops “...
*October 5, 2012*

**Physics**

Standing-wave vibrations are set up in a crystal goblet with four nodes and four antin- odes equally spaced around the 26.3 cm cir- cumference of its rim. If transverse waves move around the glass at 900 m/s, an opera singer would have to produce a high harmonic with what ...
*October 5, 2012*

**Physics**

The lowest A on a piano has a frequency of 27.5 Hz. Assume: The tension in the A piano wire (of length 0.51 m) is 305 N, and one-half wavelength occupies the wire. What is the mass of m the wire? Answer in units of kg.
*October 5, 2012*

**Physics**

A harmonic wave is traveling along a rope. It is observed that the oscillator that gener- ates the wave completes 38.9 in 27.4 s. Also, a given maximum travels 432 cm along the rope in 10.6 s. What is the wavelength? Answer in units of cm.
*October 5, 2012*

**Physics**

A variable-length air column is placed just below a vibrating wire that is fixed at the both ends. The length of air column open at one end is gradually increased from zero until the first position of resonance is observed at 20 cm. The wire is 115.4 cm long and is vibrating ...
*October 1, 2012*

**Physics**

explain Lambda? I was sick and missed class?
*October 1, 2012*

**Physics**

A length of organ pipe is closed at one end. If the speed of sound is 344 m/s, what length of pipe is needed to obtain a funda- mental frequency of 70 Hz? Answer in units of m.
*October 1, 2012*

**Physics**

A pipe that is open at both ends has a fundamental frequency of 330 Hz when the speed of sound in air is 333 m/s. What is the length of this pipe? Answer in units of cm. What is the second harmonic? What is the third harmonic? Answer in units of Hz. What is the fundamental ...
*October 1, 2012*

**Physics**

The length of a string is 344 cm. The string is held fixed at each end. The string vibrates in two sections; i.e., the string has two antin- odes, and the string vibrates at 130 Hz. Find the wavelength answer in m What is the fundamental frequency? Answer in units of Hz.
*October 1, 2012*

**Physics**

To demonstrate standing waves, one end of a string is attached to a tuning fork with frequency 120 Hz. The other end of the string passes over a pulley and is connected to a suspended mass M, as shown. The value of M is such that the standing wave pattern has eight loops “...
*October 1, 2012*

**Physics**

A harmonic wave is traveling along a rope. It is observed that the oscillator that gener- ates the wave completes 38.9 in 27.4 s. Also, a given maximum travels 432 cm along the rope in 10.6 s. What is the wavelength? Answer in units of cm.
*October 1, 2012*

**Physics**

The lowest A on a piano has a frequency of 27.5 Hz. Assume: The tension in the A piano wire (of length 0.51 m) is 305 N, and one-half wavelength occupies the wire. What is the mass of m the wire? Answer in units of kg.
*October 1, 2012*

**Math**

actually it is 1.25-.86
*September 30, 2012*

**Math**

How do i figure out this question? There are two roads, one has a grade of 20% the other has an elevation of 15 degrees. Which road would be steeper?
*September 16, 2012*

**Math**

One road has a grade of 20% and the other has an elevation of 15 degrees. Which road would be steeper? How do i figure this out?
*September 13, 2012*

**math**

thank you
*September 13, 2012*

**math**

A trucker is looking on a map of two roads he could take to get to Nelson. One has a grade of 20% and the other has an elevation of 15 degrees. Which road would be steeper? How do I figure this out?
*September 13, 2012*

**physics**

Two point charges are placed along a horizontal axis with the following values and positions: +3 µC at x = 0 cm and - 12 µC at x = 35 cm. At what point (the coordinate) along the x axis is the electric field zero? Expess the answer (in cm) with one decimal place.
*September 11, 2012*

**com/155**

what objecets,people,subject or concepts are you going to compare and or contrast?
*August 16, 2012*

**math**

what is (24 divide by 4)+(3 times 6 +4)
*August 15, 2012*

**Physics**

An ac generator supplies an rms voltage of 5.00 {\rm V} to an RL circuit. At a frequency of 21.0{\rm kHz} the rms current in the circuit is 45.0 {\rm mA}; at a frequency of 26.0{\rm kHz} the rms current is 40.0 {\rm mA}. Find value of L an R ?
*July 30, 2012*

**com/155**

Review the steps in the prewriting phase of essay writing. How important do you think prewriting is to the success of an essay? Can you skip the prewriting phase? Why or why not?
*July 26, 2012*

**geometry**

i got 56√90 but that's not one of the answer. The answers are 84√5 cm^3 168√10 cm^3 336√5 cm^3
*July 25, 2012*

**geometry**

Find the volume of a rectangular solid with the following dimensions: 2√3 cm x 7√5 cm x 4√6 cm.
*July 25, 2012*

**compostition**

I need a topic to Write a 150- to 200-word paragraph to explain how purpose, audience, tone, and content impact academic writing. Be sure to use the three components of a good paragraph covered in this weekâ??s readings. Underline the topic sentence and bold the ...
*July 22, 2012*

**chemistry**

How many moles of Ca(NO3)2 are needed to make 0.250 liters of a 0.200 M Calcium nitrate solution?
*April 29, 2012*

**algebra**

Joseph always throws change into a can and takes it out every two weeks. This time it is all nickels and dimes. There are six times as many dimes as nickels, and the value of the dimes is $4.95 more than the value of the nickels. How many nickels and dimes does Joseph have. (...
*April 22, 2012*

**calculus**

Let f be the function given by: f(x)=1/5x^5/2+x^-1/2, for all x in [1,4]. Find the length of the graph of f.
*April 9, 2012*

**Math**

A wire is stretched from the top of a 12-foot pole to a stake in the ground and then to the base of the pole. If a total of 20 feet of wire is needed, how far is the stake from the pole (the answer is NOT 16)
*April 3, 2012*

**9th grade math**

37 and 15
*April 3, 2012*

**algebra**

A man invested half of his money at 5%, one-third of his money at 4%, and the rest of his money at 5.5%. If his total investment income was $570, how much had he invested? and please show me the solution to solve this problem. thanx sorry bobpursly I cant understand your ...
*February 25, 2012*