Wednesday

July 29, 2015

July 29, 2015

Total # Posts: 2,509

**Physics**

How do you calculate the magnitude of the uncertainty of the net force, U{F}? I was given several different equations but for some reason I'm still confused. Any help would be greatly appreciated.
*January 28, 2012*

**Physics**

How do you calculate the magnitude of the uncertainty of the net force, U{F}? I was given several different equations but for some reason I'm still confused. Any help would be greatly appreciated.
*January 28, 2012*

**Physics**

Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?
*January 25, 2012*

**Physics**

Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?
*January 25, 2012*

**Physics**

A hunter wishes to cross a river that is 1.6 km wide and that flows with a speed of 4.8 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.6 km/h with respect to the water. What is the minimum time necessary for crossing?
*January 19, 2012*

**physics**

a car rolls off a cliff and lands 15m from the base. if the cliff was 22m high, how fast was the car going? show work.
*January 15, 2012*

**physics**

A 20000 kg airplane takes off by traveling 300 m down a runway while the engines exert a continuous force of 4000 N.(a) Calculate the change in kinetic energy of the airplane during takeoff.(b) Determine the speed of the airplane as it leaves the runway.
*January 13, 2012*

**HELP**

okeedokey
*January 12, 2012*

**HELP**

i need a printable protractor
*January 12, 2012*

**Science **

how is it possible to figure out a science problem like this EXAMPLE:s=2m*6Hz=2m*6(1/s)=12m/s if they don't tell you what the letters mean?
*January 10, 2012*

**Geometry**

MO bisects <LMN,m<NMO=(6x+19)°,andm<LMO=(9x-14)°. Solve for x and find <LMN.
*January 9, 2012*

**math**

kano's college is 1200 miles away.he drives 300 miles each day.how long will it take him to get to college? _______________________________________ days / miles per day /miles in all _______________________________________ 5 / 300 /1500 300*5 =1500 is the number model write?
*January 5, 2012*

**stuff**

is figure skating all season
*January 5, 2012*

**math**

How many 8 by 10 inch tiles fit on a 16 by 20 ft floor ?
*January 4, 2012*

**math**

what do the numbers 8/10,0.75,0.2 and 2/5 look like in order from least t greatest?
*January 3, 2012*

**Math**

A total number of 121 people came to the school science fair this year. This number is 7 MORE than TWICE the number of people who came last year's science fair. How many people came last year?
*December 20, 2011*

**earth**

what factors contribute to the formation of fertile, deep topsoil in temperate regions?
*December 18, 2011*

**Physics**

James's tug of war team pulls with 500N of force to the right wile Jake's team pulls with 415N to the left. If James's team weighs 350 kg, how fast are they moving?
*December 11, 2011*

**physics**

A lever has a Mechanical Advantage of 13. How much force would the lever exert if you push with a 200N force?
*December 11, 2011*

**11th grade english**

I'm supposed to choose how the italicized noun clause is used. Not so sure about the different types of noun clauses.. can someone help me? & also kinda explain the difference? 1.The first thing to consider was [how to find a paying job.] S OP PN DO 2.I am optimistic ...
*December 9, 2011*

**Physics**

Two carts with masses of 4.24 kg and 3.44 kg move toward each other on a frictionless track with speeds of 4.90 m/s and 3.51 m/s respectively. The carts stick together after colliding head-on. Find the final speed.
*December 8, 2011*

**Math**

If Alice earns a monthly salary of $315 plus a comission on her total sales. Last month her total sales were $9640 and she earned a total of $1182.60. What is her comission rate?
*December 8, 2011*

**algebra**

k but how do I find that?
*December 6, 2011*

**algebra**

write an equation of the line that passes through the given point and is parallel to the given line (-1,3), y=2x+2
*December 6, 2011*

**Government**

The correct answer is the television.
*December 6, 2011*

**Science**

Stage of mitosis in which Chromosomes split apart
*December 5, 2011*

**Physics**

What is the maximum acceleration of a platform that oscillates with an amplitude of 2.1 cm at a frequency of 6.7 Hz? I feel like this is a very simple question, but I'm having trouble figuring it out.
*December 5, 2011*

**Physics**

A radio set at a sound level of 20 dB is suddenly increased to 80 dB. how many more time greater is the pressure amplitude at 80 dB? I do not know what to do please help
*December 1, 2011*

**Calculus I**

Find the exact area of the surface obtained by rotating the curve about the x-axis. y = sqrt(1+5x) from 1<x<7
*December 1, 2011*

**Calculus I**

Find the exact area of the surface obtained by rotating the curve about the x-axis. y = sqrt(1+5x) from 1<x<7
*December 1, 2011*

**3rd Grade Math**

Why is this statement wrong? The greater number of counters, the greater the number of arrays you can form.
*November 30, 2011*

**COMPUTER HARDWARE MANAGEMENT**

AMD (Advanced Micro Devices) is the second largest maker of personal computer microprocessors after Intel. They also make flash memory, integrated circuits for networking devices, and programmable logic devices. AMD reports that it has sold over 100 million x86 (Windows-...
*November 29, 2011*

**algebra**

There are 7 coins in a piggy bank. The coins are all quarters and dimes. All together the total amount of money in the bank is $1.15. How many of each coin are in the piggy bank.
*November 21, 2011*

**Physics**

Two disks are mounted (like a merry-go-round) on low-friction bearings on the same axle and can be brought together so that they couple and rotate as one unit. The first disk, with rotational inertia 2.58 kg·m2 about its central axis, is set spinning counterclockwise (...
*November 18, 2011*

**Social Studies**

During Rutherford B. Hayes's presidential run, what's was bad or good about it?
*November 16, 2011*

**MATH**

no, why?
*November 16, 2011*

**MATH**

i need this as quick as possible please Omar is building a straight fence, with posts one meter apart. If the fence is 13 meters long, how many fence posts does he need? If the fence is 13 meters long, how many fence posts does he need?
*November 16, 2011*

**Physics**

If a&b are vectors such that a+3b=-3i+j & a-b=i-2j then find vectors a&b.
*November 16, 2011*

**Math**

A fence 8 ft tall runs parallel to a tall building at a distance of 4 ft from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?
*November 14, 2011*

**Physics**

Suppose vectors a&b, if a cross b=c. Show that c is perpendicular to a&b.
*November 13, 2011*

**math**

The height of an object thrown upward with an initial velocity of 96 feet per second is given by the formula h = -16t2 + 96t, where t is the time in seconds. How long will it take the object to reach a height of 144 feet?
*November 9, 2011*

**Sport please help me i have a test 2morrow**

What are the reasons for the olympic games to be largest of all sporting events?
*November 9, 2011*

**Sport**

Why Olympia selected to hold at the ancient Olympic Games?
*November 9, 2011*

**english 2**

WHAT INFERENCE CAN YOU MAKE FROM THE FACT THAT IT IS FORBIDDEN TO GO TO THE PLACE-BY THE WATER OF BABYLON
*November 9, 2011*

**Physics**

Calculate the rotational inertia of a wheel that has a kinetic energy of 41.6 kJ when rotating at 264 rev/min.
*November 9, 2011*

**Pre-Algebra**

ok well my pre algebra teacher copied some worksheets and its pg 40 and its about some friars in a floral shop buisness. for extra credit we do the joke which is also a way to find out if our answers were correct. there is no 3/8 in my answers and welll yeah thats it.
*November 8, 2011*

**Pre-Algebra**

Ok so im in 7th grade and can somone help me with pizzazz worksheet #40? Pretty please?
*November 8, 2011*

**chemistry**

Write the formula unit, total ionic, and net ionic equation for the precipitation reaction in a beaker after Al(ClO4)3, Rb2S, and CsI salts are added. Please help!
*November 7, 2011*

**factoring polynomials help?**

5p^2+14p+8
*November 6, 2011*

**Math**

if a football team gained 13 yards in 3 tries how many yards will they gain in 9 tries
*November 6, 2011*

**Chemistry**

Sorry Dr. Bob, I wsa looking for the Sucrose, not all 16 calculations. Can you help me with the Sucrose? I have 93.954 mL of a generic cola solution. The solution contains: Molarity of H++1.005e-7 Molarity of OH- = 1.005e-7 Molarity of Sucrose(aq) = 6.386e-1 Molarity of Dye= ...
*November 3, 2011*

**Chemistry**

I have 93.954 mL of a generic cola solution. The solution contains: Molarity of H++1.005e-7 Molarity of OH- = 1.005e-7 Molarity of Sucrose(aq) = 6.386e-1 Molarity of Dye= 5.322e-3 Calculate the mass percent, molarity, molality and mole fraction.
*November 3, 2011*

**Language Arts**

I was so tired when I got home, my bed welcome me with open arms.what does this mean?
*November 2, 2011*

**calculus**

The hypotenuse of a right triangle has one end at the origin and one end on the curve y = (x^4)(e^-7x), with x > 0. One of the other two sides is on the x-axis, the other side is parallel to the y-axis. Find the maximum area of such a triangle.
*November 1, 2011*

**calculus**

The hypotenuse of a right triangle has one end at the origin and one end on the curve y = (x^4)(e^-7x), with x > 0. One of the other two sides is on the x-axis, the other side is parallel to the y-axis. Find the maximum area of such a triangle.
*November 1, 2011*

**Math word problem**

can you explain how you got it?
*November 1, 2011*

**Math word problem**

jack was 21 years older than kat. Together their ages totaled 161 years. What were their ages?
*November 1, 2011*

**Physics**

A 0.5 kg wooden block is placed on top of a 1.0 kg wooden block. The coefficient of static friction between the two blocks is 0.35. The coefficient of kinetic friction between the lower block and the level table is 0.2. What is the maximum horizontal force that can be applied ...
*October 30, 2011*

**calculus**

f(x)=cos(1/x) Find a sequence for x-values that approach 0 such that cos(1/x)=0.
*October 29, 2011*

**chemistry**

If you have a solution that is 1.7 M sodium chloride and you have 1 L of that solution, how many moles of sodium chloride do you have?
*October 28, 2011*

**Math**

Maria has $5.05 in quarters and dimes. The number of quarters exceeds twice the number of dimes by 1. Find the number she has of each kind.
*October 28, 2011*

**Chemistry**

Calculate the mass of solid neded to make 500ml of solution that is 0.25m in sulfate ion, using sodium sulfate decahydrate.
*October 28, 2011*

**algebra**

thanx :)
*October 27, 2011*

**algebra**

i REALLY need some help with this. i HATE math! :(
*October 27, 2011*

**algebra**

1. - 5(2x+2)is greater than or equal to -10x - 17 (1 point) a)x is greater than or equal to 7 b)x is less than or equal to 19 c)all real numbers d)no solution
*October 27, 2011*

**LA/Lit.**

Word withing the word analogies. primate is to primeval as coelenterate is to medieval deliberate is to archival ingrate is to credible migrate is to primal
*October 25, 2011*

**geometry**

given line segment PQ , PQ=3QR, and QR= 1/3 RS Prove: line segment PQ is congruent to line segment RS
*October 24, 2011*

**statistics**

IQ scores are normally distributed and assume that the average IQ for all Economics majors is 108 with a standard deviation of 11. What percentage of Economics majors would have an IQ of more than 118?
*October 24, 2011*

**statistics**

Suppose the amount of time it takes for statistics students to complete their midterm is normally distributed with a mean of 85.70 minutes and a standard deviation of 22.55 minutes. If 10 students are randomly selected, what is the probability that they would average less than...
*October 24, 2011*

**geometry**

triangle ABC is an isosceles right triangle. The endpoints of the hypotenuse of ABC are A(4,7)B(8,1). Find the possible coordinates for the vertex C
*October 23, 2011*

**Alegra 2**

A baseball is hit at a point of 3 feet above ground at a velocity of 100 feet per second and an angle of 45 degrees. The path of the baseball is h(x)= -0.0032(x-156.25)squared+87, where x and h(x) are measured in feet. A. what is the baseball's maximium height? B. will the...
*October 23, 2011*

**Chem**

A radiation lab orders 64uCi of P-32. After 42 days the activity of the sample is 8.0uCi. What is the life of P-32? Thanks
*October 19, 2011*

**chemistry**

I got yeah! 40---> 20----> 10 5,730---> = 11,460 years
*October 19, 2011*

**Algebra 1**

(-10/10) - (-18/9)
*October 18, 2011*

**social studies**

Lack of food, didnt know how to provide for themselves in the new world
*October 18, 2011*

**math**

3a to the third plus 12a squared minus 63a
*October 17, 2011*

**science**

The specific heat of silver is 0.057 calories/gram°C. If 10.0 grams of silver were heated and the temperature of the sample changed by 20.0°C, how many calories of heat energy were absorbed by the sample? (A)3,508 calories (B)0.029 calories (C)11.4 calories (D)0.114 ...
*October 17, 2011*

**chem**

How many grams of H20 are produced when 140 grams of NH3 reacts by the following? Answer in 3 SF 4NH3+6NO--->5N2+6H20 Please help! Thanks
*October 14, 2011*

**Chemistry**

How many moles of CaCl2 are in 250mL of a 3.0M of CaCl2? Ca=40.08 -- Cl=35.45 X 2 ?? Thanks
*October 14, 2011*

**pre algebra**

how do you simplyfy -9+-9+-9+-9
*October 13, 2011*

**pre algebra**

how do i figure out how to write a number setence for the product on the number line -10 -8 -6 -4 -2 0 2
*October 13, 2011*

**Physics**

A 0.30 kg stone attached to a 0.8 m long string is rotated in a horizontal plane. The string makes an angle of 15° with the horizontal. Determine the speed of the stone.
*October 12, 2011*

**physics**

An object is dropped from a cliff and reaches a velocity of 47.5 m/s at the time of impact. a) How high is the cliff? b)How long did it take to hit the river below?
*October 11, 2011*

**physics**

a 75 kg person escapes from a burning building by jumping from a window 30 m above a catching net. Acceleration due to gravity is 9.81 m/s^2. Assuming air resistance is simply a constant 96 N force on the person during the fall, determine the person's velocity just before ...
*October 11, 2011*

**math**

6.2 hours...?
*October 11, 2011*

**physics**

A skier is accelerating down a 30.0° hill at a = 3.70 m/s2 ( (a) What is the vertical component of her acceleration? |m/s2 (downward) (b) How long will it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if the elevation ...
*October 11, 2011*

**physics**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 13 m/s. The cliff is h = 58 m above the water's surface, as shown below. (a) How long does it take for the stone to fall to the water? s (b) With what speed does it strike the...
*October 11, 2011*

**Physics**

A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials' boat pulls up next to the spy's boat, both reach the edge of a 7.5 m waterfall. If the spy's speed is 19 m/s and the officials' speed is 24 m/s...
*October 11, 2011*

**math**

5464
*October 11, 2011*

**Statistics**

Each year, thousands of college seniors take the Graduate Record Examination (GRE). Assume the scores are transformed so they have a mean of 600 and a standard deviation of 150. Furthermore, the scores are known to be normally distributed. Determine the percentage of students ...
*October 8, 2011*

**Physics**

Estimate the force a person must exert on a string attached to a 0.160 kg ball to make the ball revolve in a circle when the length of the string is 0.600 m. The ball makes 1.80 revolutions per second. Do not ignore the weight of the ball. In particular, find the magnitude of ...
*October 6, 2011*

**physics**

During a basketball game, a player flies above the basket and drops the ball in from a height of 10 meters. If the ball takes 4.4 seconds to fall, find the acceleration due to gravity.
*October 3, 2011*

**Physics**

A dog team driven by an Inuit hunter pulls two toboggans (Figure 1.49). The dog team can apply a maximum force of 700 N. Each toboggan experiences a constant frictional force of 100 N. a) Determine the acceleration of the two toboggans, if each has a mass of 300 kg. b) What is...
*October 2, 2011*

**Chemistry**

Sam Student calibrates a flask with water at 20C. Patricia Pupil borrows the flask and Sam's calculated volume for the flask, and uses it to do her unknown at 25 C. What, if any specific effect will this have on the results of Patricia's density determination? Explain ...
*September 27, 2011*

**Is this write or wrong?**

Yes, B is the right answer.
*September 27, 2011*

**physics**

A rocket-driven sled running on a straight, level track has been used to study the physiological eﬀects of large accelerations on astronauts. One such sled can attain a speed of 440 m/s in 1.9 s starting from rest. What is the acceleration of the sled, assuming it is ...
*September 25, 2011*

**physics**

suppose that all the people of the earth went to the north pole and on a signal all jump straight up. estimate the recoil speed of the earth. the mass of the earth is 6 x 10^24 kg and there are about 6 billion people(6 x 10^9).
*September 25, 2011*

**math HELP!!**

You use compatible numbers .
*September 20, 2011*

**math HELP!!**

U would do 60,000 divided by 50 because 60,000 is close to 56,225 and 48 is close to 50
*September 20, 2011*