# Phil

Popular questions and responses by Phil-
## Physics

A guitar string is 90cm long and has a mass of 3.8g . The distance from the bridge to the support post is L=62cm , and the string is under a tension of 540N . What are the frequencies of the fundamental and first two overtones?

*asked on January 25, 2013* -
## algebra

using formula d(h)=8e^-0.4h to determine the milligrams d of a certain drug in bloodstream h hours after given.how many milligrams will be present after 6 hours?

*asked on July 17, 2013* -
## Physics- PLEASE HELP

Two boxes of fruit on a frictionless horizontal surface are connected by a light string as in the figures below, where m1 = 15 kg and m2 = 17 kg. A force of 58 N is applied to the 17 kg box. Repeat the problem for the case where the coefficient of kinetic

*asked on October 3, 2012* -
## Physics

Figure (a) shows charged particles 1 and 2 that are fixed in place on an x axis. Particle 1 has a charge with a magnitude of |q1| = 12.0e. Particle 3 of charge q3 = +13.0e is initially on the x axis near particle 2. Then particle 3 is gradually moved in

*asked on January 20, 2012* -
## History

How did the geographic location of Philadelphia affect the city's development? Because of its location on rivers, the city built bridges and used ferries to allow workers to access the city. Because of proximity to water, streets had to be properly

*asked on April 25, 2017* -
## chemistry

Standard Addition Question: Serum containing Na+ gave a signal of 4.27 mV in an atomic emission analysis. Then 5.00 mL of 2.08 M NaCl were added to 95.0 mL of serum. This spiked serum gave a signal of 7.98 mV. Find the original concentration of Na+ in the

*asked on August 9, 2015* -
## Science URGENT help please

Piano movers hoist a 200 kg piano 10 m high in 30 s using a rope and simple pulley. What is their power output? (Points : 1) 70 W 700 W 7,000 W 6 × 10^5 W

*asked on April 16, 2014* -
## English

Mr. Smith, my Spanish teacher, is going on vacation. is this correct PUNCTUATION AND GRAMMER

*asked on December 31, 2012* -
## Physics

A 13 cm long animal tendon was found to stretch 3.8 mm by a force of 13 N. The tendon was approximately round with an average diameter of 9.0 mm. Calculate the elastic modulus of this tendon.

*asked on October 28, 2010* -
## physics

A wooden box weighing 271 N is pushed across the floor by a workman who exerts a horizontal force of 144 N. If the force of friction between the box and the floor is 28 N, what is the acceleration (in meters/second^2) of the box?

*asked on March 7, 2012* -
## Physics

The coefficient of kinetic friction for a 22 kg bobsled on a track is 0.15. What force is required to push it down a 6.0° incline and achieve a speed of 64 km/h at the end of 75 m?

*asked on October 2, 2011* -
## Vectors

Show that if a, b, c are in V3, then (a x b) dot [(bxc)x(cxa]) = [a dot (b x c)]^2 I don't know what properties to use

*asked on February 8, 2011* -
## Physics

A brass plug is to be placed in a ring made of iron. At 20 degrees Celsius, the diameter of the plug is 8.737 cm and that of the inside of the ring is 8.723 cm. They must both be brought to what common temperature in order to fit? (ANSWER: -210 degrees

*asked on November 16, 2010* -
## MICROBIOLOGY

WHICH IS A RNA MOLECULE AGCCTAC GGGCCCA GCCCUUA

*asked on October 3, 2009* -
## Math

Let xy = 5 and { dy }/{ dt } = 3. Find { dx }/{ dt } when x = 1.

*asked on March 15, 2009* -
## bio

Hi. i know I already posted this but I don't understand how polyploidy contributes to evolution in finches of the galapagos islands as polyploidy most often occurs in plants.

*asked on January 12, 2009* -
## Math

The transformation T:R^2--》R^2 is defined by T(1,0)=(2,-5) and T(-3,2)=(1,4). Find the natural matrix of the linear transformation T and find T(x,y).

*asked on December 3, 2017* -
## ALGEBRA

7300 @ 7% COMPOUNDED SEMIANNUALLY FOR 3 YRS

*asked on May 18, 2013* -
## Physics

Sphere W (with an initial charge of zero) is touched to sphere A and then they are separated. Next, sphere W is touched to sphere B (with an initial charge of -26e) and then they are separated. Finally, sphere W is touched to sphere C (with an initial

*asked on January 19, 2012* -
## Physics

A chair with a mass of 30.0kg is shot with a 10g bullet traveling at a speed of 250m/s. The bullet goes 6cm into the chair. The given kinetic friction for for this problem is .2. How far does the chair slide in cm?

*asked on October 2, 2011* -
## Calculus

Find the equation of the plane through (1,2,-2) that contains the line x = 2t, y = 3 - t, z = 1 +3t

*asked on February 17, 2011* -
## science

If it happens that a neurotransmitter binds to a receptor site and produces a negative voltage shift, the probability: that the neurons are densely connected decreases. of an excitatory response increases. that the receiving neuron will fire decreases.

*asked on November 8, 2010* -
## Physics

A sprinter starts from rest in a 100-meter race, accelerates to his full running speed of 10.3 m/s in 1.15 seconds (assume constant acceleration) and continues at that speed for the rest of the race. (a) How far did he run before attaining his full speed?

*asked on September 16, 2010* -
## MICROBIOLOGY

WHICH IS /ARE COMPLEMENTARY TO 5' AGGCUAAC 3' 1. 5'TCCGATTG3' 2. 3'TCCGATTC5' 3. 5'CTTAGCCT3' 4.3'TAAGCTTA5' 5. 3'TCCGATTG5' AND 5'GTTAGCCT3'

*asked on October 3, 2009* -
## calculus

A tank has a rectangular base 3 m × 4 m, the vertical sides are 6 m high, and the depth of the water is 2 m. How much work is required to pump all of the water out over the side? The density of water is 1000 kg/m3 and gravitational acceleration is 9.8

*asked on May 4, 2020* -
## Physics

You have a neutral balloon. What is its charge after 12000 electrons have been removed from it? The elemental charge is 1.6 × 10−19 C. Answer in units of μC

*asked on February 6, 2018* -
## Mechanical Engineering

The equation for flow in a circular pipe for a special kind of fluid, called a "power-law" fluid is given by v=(delP/2mL)^1/n * (n/n+1)*[R^(n+1/n) - r^(n+1/n)] where m and n are constants of the fluid, and delP/L is the change in pressure per unit length

*asked on June 29, 2017* -
## please help, Word problem

At a local baseball game, the concession stand has two different meal choices. you can get 3 hotdogs and 5 drinks for $25.00 or you can get 6 hotdogs and 4 drinks for $29.00. If the price of hotdogs and drinks is the same for each meal, find how much it

*asked on April 11, 2017* -
## Maths

The angles of elevation of the highest point of a building from two points S and T are 60 degree and 30 degree respectively,T is vertically above S and ST=10m.Calculate the height of the building above the level of S

*asked on February 7, 2017* -
## Algebra

The number of 37-inch HDTV's that is expected to be sold in a month is double that of 58-inch HDTV's and 50-inch HDTV's combined.sales of 58-inch HDTV's are expected to be equal. 58-inch HD-TV's sell for $4,800, 50-inch HD-TVs sell for $2000, and 37-inch

*asked on June 22, 2015* -
## statistics

In a class of 100 students, 30 are computer science majors, 49 are mechaincal engineering majors, 13 are civil engineers and the rest are general engineering majors. Assume students only have one major. If a student is chosen at random what is the

*asked on January 16, 2015* -
## math

Sue has a total of $4000 to invest in two accounts. one account earns 2% simple interest and the other earns 5% simple interest. How much should be invested in both accounts to earn exactly $155 at the end of the year?

*asked on October 3, 2014* -
## algebra

A plane takes 3 hours to travel 1500 miles with the wind. it can travel only 1380 miles against the wind in the same amount of time. Find the speed of the wind and the speed of the plane in still air.

*asked on October 3, 2014* -
## physics

A bicycle wheel of radius 0.4 m is spinning at a rate of 40 revolutions per minute. What is the centripetal acceleration of a point on the edge of the wheel? What is the period of the wheel's motion?

*asked on September 28, 2012* -
## physics

A +50 micro coulomb and 30 micro coulomb charge are placed 50cm apart. a)what is the direction and magnitude of thee electric field at a point P, in between them, that is 10cm from the 30 micro coulomb charge? b)if an electron is placed at rest P, what

*asked on May 3, 2012* -
## Chemistry

Calculate the heat released from 61.5 g of steam at 111 degrees C is converted to water at 39 degrees C. Assume the specific heat of water is 4.184 J/g*C, the specific heat of steam is 1.99 J/g*C and the enthalpy.H.vap= 40.79 KJ/mol of water

*asked on January 26, 2012* -
## homework

every yellow marble is expensive.one -half the orange marbles are expensive.one -half of all expensive marbles are yellow. there are 40 yellow marbles and 25 expensive marbles that are niether yellow nor orange. how many orange marbles are there?

*asked on October 30, 2011* -
## Physics

Can someone please help me? The brakes of a truck cause it to slow down by applying a retarding force of 2.60 103 N to the truck over a distance of 930 m. What is the magnitude of the work done by this force on the truck? Is the work positive or negative?

*asked on March 15, 2011* -
## Physics

Estimate the work you do to mow a lawn 14m by 23m with a 0.5m-wide mower. Assume you push with a force of about 15N.

*asked on September 29, 2010* -
## Physics

A 1100 kg car is moving toward the north along a straight road at a speed of 20.0 m/s. The driver applies the brakes and the car comes to rest in a distance of 140 m. (a) If the road is completely level, what is the constant force applied to the car to

*asked on September 16, 2010* -
## french

we have been given a text and have to find words in it. we have to find the word bothers/upsets all i know is that it begins wit 'in' could it be indispose as it is the only word beginning with it we also have to find (here)encounter an it begins with

*asked on November 7, 2009* -
## physics

show that for a pendulum to oscillate at the same frequency as an object on a spring, the pendulum's length must be L=mg/k thank you

*asked on January 21, 2009* -
## history

1. The Filipino insurrection led by the Aquinaldo was the result of a. the senate vote ratyfing the treaty of paris ending the spanish american war b. the extension of american military occupation of manila to the entire archipelago 2. The american

*asked on January 19, 2009* -
## Chemistry

What is the effect on the boiling point of a solution (for example, water) produced by a soluble nonvolatile substance (for example, sodium chloride)? What is the effect of an insoluble substance such as sand or charcoal? I believe if an insoluble

*asked on November 10, 2008* -
## Literary Terms

What is the difference between Juxtaposition and Antithesis?

*asked on October 27, 2008* -
## Calculus

Set up a definite integral (but do not evaluate it!) for the area of the surface obtained by rotating the curve y =x^3/3 , 0 ≤ x ≤ 1, about the x-axis. The integral should contain only one variable (x or y).

*asked on May 4, 2020* -
## calculus

Find the area enclosed by r = θ, and the interval [0, 2π] on the x-axis.

*asked on May 4, 2020* -
## Calculus

Consider the curve C parametrized by (x, y) = (cos (5t), sin(−4t)), for −π ≤ t ≤ 2pi How would I go about finding how many times the curve is traversed? Also, how would I find out the radius and center of the circle is? I don't need answers I just

*asked on September 9, 2019* -
## math

How much interest will I owe if I put $10000 on my credit card, with 12% interest, and not pay anything for 4 months?

*asked on September 4, 2019* -
## biology

Suggest reasons why fats and oils are an efficient form of energy storage for living systems?

*asked on September 26, 2018* -
## Physics

okay for a) I got the answer as 11.67 seconds and did v=d/t and for b) i found that wavelength= 6km. Im confused how the 100 m deep affects the equation for c and d. The 2011 Japan tsunami was triggered by an earthquake 70 km offshore. The earthquake

*asked on April 18, 2017* -
## Physics

One more please, I cant figure out the equations. Boats generally have a hard time traveling faster than their hull speed, which is thespeed of a water wave that has the same wavelength as the boat length? (a) What is the hull speed for a 5 meter canoe in

*asked on April 18, 2017* -
## Physics

You and your friend are talking on a string telephone that is 14 m long. Each of you pulls on the string with about 9 N of force, meaning that the string tension is 9 N. The string has a mass density of 1.2 g/m. How long does it take for your voice to

*asked on April 18, 2017* -
## Physics

A pipe organ is an aerophone with open ended tubes, with esssentially the same physics as the flute. (a) for normal room temperature, where the speed of sound is about 340 m/s how long is the pipe for the A440 note. (b) Suppose someone wanted to install an

*asked on April 18, 2017* -
## Physics

You are sitting on a train that is about to drive into a tunnel that is at the base of a large cliff. Just before entering the tunnel, the train blows its whistle, which has a frequency of 600 Hz. (a) What frequency do you hear from the whistle directly?

*asked on April 17, 2017* -
## Physics

A modern computer central processing unit chip (CPU) runs with a clock speed of 2.7 GHz. It can execute one operation in each of these clock cycles. (a) how many seconds long is one clock cycle? (b) Electrical signals travel at the speed of light How far

*asked on April 6, 2017* -
## science

What property must a substance have if you want to use the substance to make aqueous solution

*asked on March 21, 2017* -
## Math

From a point P on the ground which is 100m from the foot of a church tower, the angle if elevation of the top of the tower is 50 degrees calculate the height of the tower...

*asked on September 21, 2016* -
## Physics

How do you calculate tension

*asked on July 7, 2016* -
## Math-Calc

Suppose that f(x)=6x(3−2x)3. f(x)=6x(3−2x)3. Find an equation for the tangent line to the graph of ff at x=1x=1.

*asked on May 26, 2016* -
## Physics

A car drove 17m/s [N] for 10 seconds, and then speeds up to 25m/s [S] for 7.4 seconds. What is the average speed of the car?

*asked on April 24, 2016* -
## Precalculus

The graph of the parametric equations x=cos(t), y=sin(t) meets the graph of the parametric equations x=2+4cos(s), y=3+4sin(s), at two points. Find the slope of the line between these two points.

*asked on April 9, 2016* -
## Chemistry

How do you prepare one liter of phosphate buffer 0.01 M at pH 12.0 from 85% phosphoric acid (density 1.69g/ml) and NaOH 1.0 M

*asked on April 7, 2016* -
## math

simple interest per month on $210,000.00 loan at 1/4% is how much?

*asked on January 17, 2016* -
## SQL PROGRAMMING INFORMATION SYSTEMS

In the following SQL query why do they have an independent letter then period then the table name? I seemed to have missed something in the reading and cannot find it for the life of me SELECT D.DNAME, E.ENAME FROM DEPT D LEFT OUTER JOIN EMP E ON D.DEPTNO

*asked on November 18, 2015* -
## Physics

An object falls from rest. While falling it changes its speed by 10 meters per second every second. Calculate how far it has fallen, in meters, after falling for 4 seconds. However, do not put the units in the box below.

*asked on November 4, 2015* -
## Physics

A stone is dropped from the top of a cliff and hits the round below with a speed of 50m/s. Assume that the acceleration due to gravity is 10m/s/s. Find it's mean speed, in m/s, during the fall. Do not include units when typing your answer into the box.

*asked on November 4, 2015* -
## Physics

A car is initially travelling at 30m/s, which is above the speed limit. The driver sees a speed limit trap ahead and applies the brakes for 5 seconds, causing the car to slow down by 2m/s every second while the brakes are on. How far does the car travel

*asked on November 4, 2015* -
## Physics

Two blocks with masses m1 = 24.3 kg and m2 = 66.9 kg, shown in the figure, are free to move. The coefficient of static friction between the blocks is 0.34 but the surface beneath m2 is frictionless. What is the minimum force F required to hold m1 against

*asked on October 22, 2015* -
## statics

5N 30degrees and 10N 45 degrees 10N at 3rd quadrant. find the direction of resultant force.(in degrees) a.)2.74 b.)-4.57 c.)-2.74 d.)5.33 e.)4.57

*asked on August 26, 2015* -
## Area

How many flowers can you plant in an area 19 square metres if each flower needs 0.04 square metres of space

*asked on August 7, 2015* -
## Algebra problem

A cyclist travels at an average speed of 12km/h. At this rate how far will he travel in 9h What's the equation for this?

*asked on August 1, 2015* -
## English

Can you make me a sonnet. 14 lines . 10 syllables. any topic will do.

*asked on July 30, 2015* -
## Computer

Input Process Output or IPO with Flowchart Question: A reel of electric wire 150 metres long is cut into two pieces.One is 40 metres shorter than twice the length of the other.How long is each piece. Please answer with flowchart.Thanks and god bless.

*asked on July 23, 2015* -
## Math

A reel of electric wire 150 metres long cut into two pieces. One is 40 metres shorter than twice the length of the other. How long is each piece.

*asked on July 6, 2015* -
## Math

At an electronics store, the number of 37-inch HGTVs that is expected to be sold in a month is double that of 58-inch HGTVs and 50-inch HGTVs combined. Sales of 58-inch and 50-inch HGTVs are expected to be equal. 58-inch HD-TVs sell for $4800 50-inch

*asked on June 22, 2015* -
## Algebra

The Jones family bought a new pet rabbit. They want to build an enclosure outside . They have 30ft of lumber. Find the length and width of the enclosure if the length is to be 4ft longer than twice the width.

*asked on June 22, 2015* -
## Algebra

Oil that costs $22.50/barrel is mixed with oil that costs$35.00/barrel. How many barrels of each oil should be included in 1250 barrels of mixture that sells for $27.50/barrel?

*asked on June 22, 2015* -
## Algebra

A student has 70%, 80%,79%,and 69% on the first 5 tests . There is one test left and he wants to get at least an 80% in the course. is it possible ? Explain.

*asked on June 22, 2015* -
## algebra

Deb is slicing up a cake for three people. The cake is 45cm long and the second piece is 10cm longer than the first, and the third piece is 5 cm less than double the first . How big is each slice?

*asked on June 22, 2015* -
## sciences

Electro magnetic radiations

*asked on May 19, 2015* -
## Chemistry

How much milk at 10.00°C needs to be added to a small 150.0 ml cup of coffee at 95.00 °C to drop the temperature to 90.00°C? Assume coffee and milk have the same specific heat capacity as water: 4.186 J/g °C or 1 cal/ g °C, and they also have the same

*asked on March 1, 2015* -
## MATH EMERGENCY

The demand function for a certain brand of CD is given by p = −0.01x^2 − 0.2x + 12 where p is the unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. The supply function is given by p = 0.01x^2 + 0.7x + 1

*asked on December 3, 2014* -
## math

A 70% acid solution is to be mixed with a 40% solution. How many gallons of each solutions are needed?

*asked on October 2, 2014* -
## Physics

Two small pith balls, each of mass m = 17.4 g, are suspended from the ceiling of the physics lab by 1.2 m long fine strings and are not moving. If the angle which each string makes with the vertical is = 17.9°, and the charges on the two balls are equal,

*asked on September 5, 2014* -
## physics

The top floor of a building is 40m m above the basement. Calculate how much greater the water pressure is in the basement than on the top floor. Express your answer to two significant figures and include the appropriate units.

*asked on April 3, 2014* -
## pyhsics

The top floor of a building is 40m m above the basement. Calculate how much greater the water pressure is in the basement than on the top floor. Express your answer to two significant figures and include the appropriate units.

*asked on April 3, 2014* -
## physics

Calculate the average force per nail when Sarah (following figure), who weighs 130 pounds, lies on a bed of nails and is supported by 600 nails. (Figure 1) Express your answer using two significant figures.

*asked on April 3, 2014* -
## physics

A dike in Holland springs a leak through a hole of area 0.60cm 2 cm^2 at a depth of 1.4m m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak? Express your answer to two significant figures and include the

*asked on April 3, 2014* -
## physics

Find its density. Express your answer to two significant figures and include the appropriate units How does this compare with the density of water? Express your answer using two significant figures.

*asked on April 3, 2014* -
## physics

In the sketch, the small hydraulic piston has a diameter of 2.5cm cm . The large piston has a diameter of 6.4cm cm . For each newton of force applied to the small piston, how many newtons of force are exerted by the large piston? Express your answer using

*asked on April 3, 2014* -
## Statistics

Compare the standard deviation for the heights of males and the standard deviation for the heights of females in the class.

*asked on March 16, 2014* -
## accounting

Heww Inc., issued a $50,000, 10 year bond with a stated interest rate of 6%. Assume interest payments are made semi-annually. What is the selling price of the bond if the market rate of interest is 5%? (Round to the nearest dollar.)

*asked on February 13, 2014* -
## Math easy please help

I just need help with rounding for making sure I round my answer correctly. Can you round this 1.299678785 to the nearest hundredth Thanks :)

*asked on February 10, 2014* -
## Physics 112

Moving a charge from point A, where the potential is 370V , to point B, where the potential is 190V , takes 4.1×10−4J of work. Part A What is the value of the charge?

*asked on January 30, 2014* -
## physics

solid sphere of uniform density starts from rest and rolls without slipping down an inclined plane with angle è = 30o. The sphere has mass M = 8 kg and radius R = 0.19 m . The coefficient of static friction between the sphere and the plane is ì = 0.64.

*asked on March 31, 2013* -
## Algebra

A rectangle is 5 times longer then it is wide. If perimeter of the rectangle is 222m. What are its dimensions

*asked on March 27, 2013* -
## math

Phil invested $150 at an annual rate of 4% compounded continuously, what amout to the nearest cent will be in his account after 2 years? Graph the amount in his account over the first 8 years.

*asked on February 20, 2013* -
## math

A cable company charges $40 plus $12 for each cable jack. If x is the number of jacks installed, the linear equation is C=12x+40. graph the total

*asked on February 20, 2013* -
## Physics

A small object of mass 2.60 g and charge -17 µC "floats" in a uniform electric field. What is the magnitude and direction of the electric field?

*asked on February 17, 2013*