Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 1,002

**physics**

In the movie Spiderman 2, there's a famous minute long scene where Spiderman stops a train. If the initial speed of a five car out of control subway train was around the top speed of the NYC subway (27 m/s), and Spiderman stopped the train in exactly one minute, then what ...
*June 2, 2013*

**Math**

Not sure how to ask my question? Need help on writing a formula for trapezoid A=h(B=+b) ____ 2 without parentheses and multiplication. Hope this makes sense. If it could be explained that would be great.
*May 25, 2013*

**algebra**

How long will the ball be in the air until it lands on the ground when h=-4.9t+28t+3.2 quadratics
*May 22, 2013*

**PhySics**

Using several bags filled with different amounts of the same item, take the mass of each and develop a procedure to determine the mass of a single item. (modelling milikan's oil drop experiment)
*May 19, 2013*

**physics**

I need help devloping a procedure: Using several bags filled with different amounts of the same item, take the mass of each and develop (and enact) a procedure to determine the mass of a single item....This procedure is supposed to model Milikans oil drop experiement.
*May 18, 2013*

**Statistics**

a)100 b)9.1287 c)0.851
*May 18, 2013*

**Statistics**

a) 0.3571 b).02193 c).0229
*May 18, 2013*

**statistics**

a)1, 1, 0, 0, 0, 0 1, 0, 0 b)1, 1, -1, -1, 0, 0 1, -1, 0 c)0 d)12.6490
*May 18, 2013*

**Physics**

Please help simonsay! Have problem with expresion too.
*May 14, 2013*

**Physics**

A singly charged positive ion has a mass of 5.2x10^-27 kg. After being accelerated from rest through a potential difference of 750V, the ion enters a magnetic field of 0.65T. Calculate the radius of the path of the ion in the field.
*May 11, 2013*

**Physics**

An electron in a television CRT moves toward the front of the tube with a speed of 7.5x10^6 m/s. A magnetic field of 0.04T (on a 50 degrees angle) causes the electrons to accelerate. Determine the acceleration
*May 11, 2013*

**physics**

A small 8.00g metal ball is suspended by a 14.0cm long string in a uniform electric field of 1200 N/C [right] (like in question #20). If the ball has a charge of 3.5x10^-5 C, what angle will the string make in the electric field?
*May 11, 2013*

**Physic**

Help!
*May 9, 2013*

**physical scinsce**

A cannon that is 10m long is designed to launch a 10kg ball over a castle wall. In order to do this the ball must have a speed of at least 50m/s as it exits the cannon. For every 10kg of explosives used, the force on the ball in the cannon increases by 1000N. How many kg of ...
*May 9, 2013*

**Physics**

Help please!
*May 8, 2013*

**Physic**

Help!
*May 7, 2013*

**physics**

Three charges lie along the x-axis. At x = 2.0m, a charge of 15x10^-6 C is fixed. At the origin, a charge of 30x10^-6 is fixed (like in question #8). Where can a third charge be placed between them so it feels no net force?
*May 6, 2013*

**physics**

Charged spheres A and B are in fixed positions (like in question #6) and have charges 3.6x10^-6 C and -5.4x10^-6 C respectively. Calculate the net force on sphere C, which has a charge of -9.9x10^-6 C.
*May 6, 2013*

**Maths**

A+B+B=35. B+B+c=25. A+B+B+B+c=55 What is the value of B?
*May 4, 2013*

**physic**

Help!
*May 1, 2013*

**physic**

Help please!
*May 1, 2013*

**Physics**

A 76.3-kN car is travelling at 68.7 mph when the driver decides to exit the freeway by going up a ramp. After coasting 355 m along the exit ramp the car\'s speed is 30.1 mph, and it is h = 14.3 m above the freeway. What is the magnitude of the average drag force exerted on...
*April 29, 2013*

**coding**

what code are assigned for a patient admitted for chemotherapy for an azathioprione. I drug induced aplastic anemia? The patient has peripheral neuropathy of multiple joints of the lower extremities secondary to severe rheumatoid arthritis Code(s) with the POA indicatior
*April 29, 2013*

**math**

jason and jenny went to see the movie Vampires From Mars. Jason told his mother, " The movie starts at 1:15 p.m. and is 2 hours and 56 minutes long, so it will end at 5:11 p.m. Please pick us up then." What was jasons mistake and how can it be fixed.
*April 28, 2013*

**Chemistry**

In the qualitative analysis scheme, what qualitative analysis principles are used to seperate Cu2+ from Al3+? Check all that apply. -Selective precipitation -Fractional precipitation -Amphoteric precipitate solubilization -Competitive equilibrium solubilization: anoion ...
*April 24, 2013*

**physics**

The velocity of sound in the atmosphere is c=300 m/s. An airplane is traveling with velocity v=600 m/s at an altitude of h=8 km over an observer. How far horizontally past the observer in kilometers will the plane be when the ...
*April 21, 2013*

**physics**

A neutral solid conducting cylinder rotates about its axis with angular speed 1600 rad/s. In addition, there is an external magnetic field of induction B directed along the cylinder's axis. What must the magnitude of the magnetic field in Teslas so that no ...
*April 21, 2013*

**PHYSICS**

A small block of mass 0.5 kg is released from rest at the top of a ramp of mass 3 kg that sits on a frictionless horizonal surface. When the block leaves the ramp it has a speed of 4 m.s a)what is the recoil velocity of the ramp b) how high is the ramp?
*April 17, 2013*

**PHYSICS **

A golf ball (m=0.46g is struck by a club on a 50 deg. angle over 7ms. If the bll lands 200 m away, what is the force delivered to it by the club
*April 17, 2013*

**Chemistry**

Calculate the standard potential, E^o, for this reaction from its equilibrium constant at 298K. X(s)+Y^2+(aq)= X^2+(aq)+Y(s) K=8.68E6 E^o=??V
*April 17, 2013*

**Chemistry**

A current of 4.60 A is passed through a Cr(NO3)2 solution for 1.10 hours. How much chromium is plated out of the solution?
*April 16, 2013*

**Chemistry**

A current of 4.60 A is passed through a Cr(NO3)2 solution for 1.10 hours. How much chromium is plated out of the solution?
*April 16, 2013*

**HELP URGENT Phyiics**

What mass (in grams) of steam at 100°C must be mixed with 446 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 65.0°C? The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg, and the latent ...
*April 12, 2013*

**math**

please help
*April 8, 2013*

**math**

ted has 8 autographed baseballs. all together the baseballs are worth $200.00 explain why you do not have enough information to make a bar diagram to find the value of each baseball.
*April 8, 2013*

**Quantum Physics**

6C and 6D
*April 6, 2013*

**Quantum Physics**

prob 3 C
*April 6, 2013*

**MATH**

a baseball team has 15 members, 3 of whom always play and bat at the top of the batting order. For the game Sunday, the starting lineup of nine players will be filed out from the remaining members and a batting order will be set. How many possible betting orders can be made?
*April 5, 2013*

**physics**

A man of mass 78.5 kg walks down the aisle of an airplane at a speed of 1.40 m/s in the forward direction while the plane moves at a speed of 320 m/s relative to the earth. (a) Find the man's kinetic energy relative to the plane. (b) Find the man's kinetic energy ...
*April 4, 2013*

**physics**

What are the first, second, and third frequencies audible from a 20 cm long organ pipe when (A) only one end is open and when (B) both ends are open. The speed of sound through the air inside the organ pipe is 343m/s. (Hint: if a harmonic does not exist, it would not be heard.)
*March 28, 2013*

**CHEMistry**

A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/K. The observed increase in temperature is 21.1 K at a constant pressure of one bar. Using ...
*March 27, 2013*

**physics**

exp(2piji/M)beta j
*March 20, 2013*

**physics**

Got this result for above question: exp(2ðji/M)âj However it is graded as wrong, can someone help?
*March 20, 2013*

**Quantum Physics**

Meant thanks Helpman!
*March 20, 2013*

**Quantum Physics**

Thanks Anonymous and Gyanno! Anyone got Problem 3, 4 or 5?
*March 20, 2013*

**Quantum Physics**

Thank you! Did somebody figure out one or all of the QTF6 questions?
*March 20, 2013*

**Quantum Physics**

What is w? You can use e, pi, and M in your response. Please do not subtitute 6 for M. Got this result for above question but it is graded wrong, can someone help? e^i*pi/3
*March 20, 2013*

**Quantum Physics**

In Problems 1 to 5 we will work through example of QFTM for M = 6. Problem 1: What is w? You can use e, pi, and M in your response. Please do not subtitute 6 for M. Specify the probability amplitudes. You should use w to denote ƒÖ, but please fully simplify your ...
*March 20, 2013*

**Quantum Physics**

What is w? You can use e, pi, and M in your response. Please do not subtitute 6 for M.
*March 20, 2013*

**Quantum Physics**

Anyone for b, c, d?
*March 18, 2013*

**Physics**

A skier of mass 66 kg skis straight down a 11° slope at constant velocity. Draw a free-body diagram of the skier with the various external forces acting on her. Include the force of air resistance, which is directed opposite the velocity. (Do this on paper. Your ...
*March 16, 2013*

**Math**

A trainer for a professional football team keeps track of the amount of water players consume throughout practice. The trainer observes that the amount of water consumed is a liner function of the temperature on a given day. The trainer finds that when it is 90 degrees, the ...
*March 13, 2013*

**math**

A textbook store sold a combined total of 315 physics and chemistry textbooks in a week. The number of physics textbooks sold was two times the number of chemistry textbooks sold. How many textbooks of each type were sold?
*March 7, 2013*

**math**

the problem is 0 < less then or equal to 2x-4<8 I got the answer which is 2< less then or equal to x <6 how do i write this on a graph
*March 7, 2013*

**algebra**

solve the compound inequality write the solution in interval notation 2u+4>-6 and 3u-6> -3 =
*March 7, 2013*

**DYNAMICS**

The 10-lb has an initial velocity of 10ft/s on the smooth plane. If a force F=(2.5t), where t is in seconds, acts on the block for 3s, determine the final velocity of the block and the distance the block travels during this time.
*March 5, 2013*

**DYNAMICS**

The 10-lb has an initial velocity of 10ft/s on the smooth plane. If a force F=(2.5t), where t is in seconds, acts on the block for 3s, determine the final velocity of the block and the distance the block travels during this time.
*March 5, 2013*

**Physics**

An 67.6 kg object moving to the right at 38.7 cm/s overtakes and collides elastically with a second 48.9 kg object moving in the same direction at 19.2 cm/s. Find the velocity of the second object after the collision. Answer in units of cm/s
*March 5, 2013*

**help(reading)**

when a teacher tells you whats your novel, what does he or she mean?
*March 4, 2013*

**social studies**

just numbe 12 actualy
*February 28, 2013*

**social studies**

1. Which of the following helped to increase the populations of northeastern cities? (1 point) more diversity successful cotton crops growth of factories and trade building of the Erie Canal 2. A boundary was set between Canada and the United States as a result of (1 point) ...
*February 28, 2013*

**math**

what is mental math?
*February 21, 2013*

**DYNAMICS**

A car has an initial speed of 25m/s and a constant deceleration of 3m/s^2. Determine thewvelocity of the car when t=4s. What is the displacement of the car during the 4-s time interval? How much time is needed to stop the car? How do i get the displacement?
*February 17, 2013*

**DYNAMICS**

A particle travels along a straight line with a velocity v=(12-3t^2) m/s, when t is in seconds. When t=1s, the particle is located 10m to the left of the origin. Determine the accelaration when t=4s, the displacement from t=0 to t=10s, and the distance the particle travels ...
*February 17, 2013*

**DYNAMICS**

A car has an initial speed of 25m/s and a constant deceleration of 3m/s^2. Determine thewvelocity of the car when t=4s. What is the displacement of the car during the 4-s time interval? How much time is needed to stop the car?
*February 17, 2013*

**math**

Franco went to sticker station. He bought 2 strips of 10 and 6 singles of frog stickers. He also bought 5 strips of 10 and 2 singles of butterfly stickers. How many stickers did Franco buy?
*February 6, 2013*

**math**

Franco went to sticker station. He bought 2 strips of 10 and 6 singles of frog stickers. He also bought 5 strips of 10 and 2 singles of butterfly stickers. How many stickers did Franco buy?
*February 5, 2013*

**math**

Franco went to sticker station. He bought 2 strips of 10 and 6 singles of frog stickers. He also bought 5 strips of 10 and 2 singles of butterfly stickers. How many stickers did Franco buy?
*February 5, 2013*

**Physics**

A projectile (mass = 0.17 kg) is fired at and embeds itself in a target (mass = 2.84 kg). The target (with the projectile in it) flies off after being struck. What percentage of the projectile's incident kinetic energy does the target (with the projectile in it) carry off ...
*January 22, 2013*

**physics**

A movig particle encounters an external electric field that decreases its kinetic energy from 9670 eV to 7540 eV as the particle moves from position A to position B. The electric potential at A is -66.0 V, and that at B is +16.0 V. Determine the charge of the particle. Include...
*January 18, 2013*

**physics**

The membrane that surrounds a certain type of living cell has a surface area of 4.4 x 10-9 m2 and a thickness of 1.6 x 10-8 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 4.1. (a) The potential on the outer surface of the ...
*January 18, 2013*

**physics (electric field)**

The drawing shows the potential at five points on a set of axes. Each of the four outer points is 6.2 x 10-4 m from the point at the origin. From the data shown, find the magnitude of the electric field in the vicinity of the origin.
*January 18, 2013*

**physics capacitor**

What voltage is required to store 8.0 x 10-5 C of charge on the plates of a 6.1-μF capacitor?
*January 18, 2013*

**Math**

64y^3y^4/5
*January 13, 2013*

**math**

Thank you guys!
*January 10, 2013*

**math**

A drivers distance varies directly as the amount of time traveled. After six hours, a driver had traveled 390 miles. How far had the driver traveled after 4 hours?
*January 10, 2013*

**FUNCTIONS 11**

Write an equation for nth term in the sequence: -2, 5, -10, 17, -26
*January 8, 2013*

**Math**

PLEASE HELP I DON'T KNOW WHAT TO DO D': I don't understand what to do or how to even start.... In the town of Niceville, a local lottery is held once a year for the residents. Lottery tickets cost 50 cents apiece. Each lottery ticket contains four numbers, from 1 ...
*December 30, 2012*

**in chem**

can u please tell me the number of molar mass i was using...
*December 24, 2012*

**in chem**

calculate the mass of this sample: 1.05 * 10 to the power of 26 atoms of neon, Ne(g) I know that I have to first divide by the avagadros constant, then once get the moles I need to multiply by the molar mass of neon to get the grams, I did that sevral times but I keep on ...
*December 24, 2012*

**Physics**

cart A with mass: 512g (0.512kg) is on a horizontal table. the cart is connected to cart b with mass: 51.0g (0.051kg) through a string that is crossing a pulley. cart A is released from rest at 60 cm(0.60m), it passes a photogate with a velocity of 0.90m/s. What is the work ...
*December 20, 2012*

**Chemistry**

an explanation please? i need a formula!
*December 14, 2012*

**Chemistry**

can someone give me a formula?
*December 14, 2012*

**calculus**

find the function that is finally graphed after the following transformations are applied to the graph of y=square root x in the order listed. a. reflected about the y-axis b. shift down 3 units c. shifht left 9 units please show work
*December 13, 2012*

**calculus**

write the function whose graph is the function of y=(x+5)^2 but is reflected about the x-axis. y=
*December 13, 2012*

**Algebra**

Mr. Scrooge bought 4 packages of ground beef. The second package weighed three times as much as the first, and the third package weighed half as much as the second. The fourth package weighed fifteen ounces, which was three ounces more than the third package. How many ounces ...
*December 12, 2012*

**chemistry**

* A 50 gram sample of an unknown metal warms from 18 to 58 after absorbing 800 joules of energy. what is the specific heat of the metal? *copper has a specific heat of 0.387 j/g degree celsius. what is the mass of a piece of copper that undergoes a 21.0 C temperature change ...
*December 11, 2012*

**Math**

2) which set of measure could be the side lengths of a right triangle? A. 0.9 cm, 1.2 cm, 1.5 cm B. 4 in, 4 in, 4 in C. 7 m, 8m, 9m****** D. 2ft, 3ft, 4ft
*December 6, 2012*

**Math**

Sorry meant rational number?
*December 6, 2012*

**Math**

Which of these is an irrational number? A.. Sq root of 14 B. -sq root of 9 C. -sq root of 34 D. Sq root of 72
*December 6, 2012*

**Math**

1) 3r + 5 _____. + 2 = 12-2r 2 Find value of r
*December 6, 2012*

**Chemistry**

The fictitious compound, arrhenium fluoride ( ), reacts with itself to form a dimer with the formula Ah2F2 . The reaction is second order in AhF. The value of the rate constant is 8.591x10-3 M-1s-1. What is the initial rate of reaction in a reactor filled with AhF to a ...
*December 4, 2012*

**PHYSICS**

After 6.00 kg of water at 80.4 oC is mixed in a perfect thermos with 3.00 kg of ice at 0.0 oC, the mixture is allowed to reach equilibrium. When heat is added to or removed from a solid or liquid of mass m and specific heat capacity c, the change in entropy can be shown to be...
*December 1, 2012*

**PHYSICS**

The wattage of a commercial ice maker is 226 W and is the rate at which it does work. The ice maker operates just like a refrigerator and has a coefficient of performance of 3.90. The water going into the unit has a temperature of 15.0°C, and the ice maker produces ice ...
*December 1, 2012*

**CHEMISTRY**

The standard electrode potential for the reduction of Eu3+(aq) to Eu2+(aq) is −0.43 V. determine which of the following is capable of reducing Eu3+(aq) to Eu2+(aq) under standard-state conditions? (a) Sn2+(aq) (b) ln(s) (c) HCN(aq) (d) La(s)
*November 30, 2012*

**statistics**

Working on "Inferences from Dependent Samples" trying to find the standard deviation of the difference data. Differences: 24, 53, 100, 40, -10,71,77,70, 39, 50 n=10 d=51.4 sd=??? (Answer suppose to be 30.8336 but not coming close to this number at all)
*November 30, 2012*

**CHEMISTRY**

Co(s) will oxidize Fe(s) while leaving Cu(s) unreacted, please write a balanced equation for the reagent involved?
*November 30, 2012*

**chem **

A 0.01020 mg sample of an unknown compound was found to contain 0.0084 mg of C, and 0.0018 mg of H. It was also determined that the unknown compound had a molecular weight of 58.12 g/mol. What is the molecular formula for this compound?
*November 29, 2012*

**Math**

Sorry I repeated these question to you because I forgot to add there are repeating numbers or ellipsis.
*November 29, 2012*

**Math .. Please help Reiny**

Reiny, do u think 1st question about blankets should b written differently? For e.g. If we say b= 5, then the first part of the equation will equal 175+ 5= 80. I'm thinking it should be written as this: 25 (7+b) = 300 175 + 25b = 300 25b = 125 Pls let me know what you ...
*November 29, 2012*

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