Monday

July 28, 2014

July 28, 2014

Total # Posts: 392

**physics**

After a completely inelastic collision between two objects of equal mass, each having initial speed v, the two move off together with speed v/6. What was the angle between their initial directions? if this is the equation 2mvcos(theta)=2mv/6 what numbers would replace m and v?

**chemistry**

At pH 7.2, what is the ratio [HPO4 2-]/[H2PO4-]

**chemistry**

Calculate the pH of a solution resulting from the addition of 10.0 mL of 0.10 M NaOH to 50.0 mL of 0.10 M benzoic acid (Ka = 6.5 x 10 -5

**math**

16_k=8 In the equation above, _ represents one of the operations of arithmetic: addition, subtraction, multiplication, or division. If k is a positive integer not equal to 8, what must be the value of k?

**Math**

What is the unit rate of 32 miles per hour?

**Math **

A 20-foot telephone pole casts a 4-foot shadow. what shadow length will the 6-foot man cast ? A) 1.2feet B) 2.1feet C) 2.2feet

**Math **

A 20-foot telephone pole casts a 4-foot shadow. what shadow length will the 6-foot man cast ? A) 1.2feet B) 2.1feet C) 2.2feet

**Math**

10 Jumps Thanks for all your help.

**Math**

a Frog is at the bottom of a 21 foot well. The frog jumps up 4 feet, and then falls back 2 feet. How many jumps will it take for the frong to jump out of the well?

**Math**

Thanks. Now I understand.

**Math**

After 7 jumps foward and 6 backward.

**Math**

I dont have any idea.

**Math**

Jump Number Position After jump forward Position after Step Back

**Math**

Barbara is playing a game. She jumps forward 5 feet, and then steps backward 2 feet. How many jumps will it take her to reach the finish line, which is 20 feet from where she started? Make a table to show Barbara's position. Barbara will reach 20 feet on jump number _____?...

**Physics**

An m = 6.80-kg clay ball is thrown directly against a perpendicular brick wall at a velocity of 22.0 m/s and shatters into three pieces, which all fly backward, as shown in the figure. The wall exerts a force on the ball of 2670 N for 0.110 s. One piece of mass m1 = 2.80 kg tr...

**Physics**

How many rpm's will a 2'' Nd45 sphere do spinning at 340.29 m/s. Please help me!! =(

**Physics**

How many rpm's will a 2'' Nd45 sphere do spinning at 340.29 m/s. Please help me!! =(

**english/ grammer**

thanks

**english/ grammer**

would you say: her aspiration of freedom or her aspiration for freedom ?

**Math**

Why does the division of zero equal one? I just do not understand the process. I've researched it and I have read the responses, but I do not understand them. Can Someone explain it further?

**Physics**

You serve a tennis ball from a height of 2.29 m above the ground. The ball leaves your racket with a speed of 18.7 m/s at an angle of 6.55° above the horizontal. The horizontal distance from the court's baseline to the net is 11.89 m, and the net is 1.07 m high. Neglec...

**math-precalc**

In the shot put, the shot must land within a 40 degree sector. Consider a coordinate system where the vertex of the sector is at the origen, one side lies along the positive x-axis, and the units are meters. If a throw lands at the point with coordinates (16, 12), how far is i...

**physics**

m= .025 kg initial velocity= 27 m/s time= 5.0*10^-4 final velocity= 10 m/s Force*time=mass( final vecolicy - negative initial velocity) F(5.0*10^-4)=(.025)(10-(-27)) F=(.025)(10-(-27))/(5.0*10^-4)

**Math (please help!)**

The largest Ferris Wheel in the world is the London Eye in England. The height (in metres) of a rider on the London Eye after t minutes can be described by the function h(t) = 67 sin[0.2094(t-30)] + 70 Using this equation i'm supposed to find the diameter, the maximum (top...

**math formula?**

Thank you so much!

**math formula?**

Based on an average cost per year to attend a university or college of your choice, how much should be invested each month to obtain the goal of that amount (the goal is 40,000$)? Assume 6%/a compounded monthly for 5 years. I don't need the answer, just the formula please!

**physics**

A force of 100 Newtons acts upwards on a mass of 50 kg, another force of 60 newtons acts on the same mass downwards. calculate the accleration in which direction will be the accleration

**math**

How do you find (in radians) the exact value of: tan[pi-(pi/12)]

**math**

solve the first equation for y. 5x-y=-1 subtract 5x from both sides -y=-1-5x divide by -1 y=1+5x now, plug this answer in for y in the second equation. 15x=2y 15x=2(1+5x) 15x=2+10x 5x=2 x=.4 plug this(x=.4) into the equation for y. y=1+5x y=1+5(.4) y=1+2 y=2 therefore, x=.4 an...

**Math**

You can simplify the fraction 14/8 by dividing both the top and the bottom by a common factor. if you divide them both by 2, you get 7/4.

**Math**

thanks. How would you know how to do similar problems? Where should i start when verifying trig equations?

**Math**

verify that the equation is an identity: (1-cosX)/(1+cosX) = (cscX-cotX)^2

**6th grade Math**

How to convert 4.65 into a fraction but in simpilest form while showing your work?

**physics**

A tightly stretched "high wire" is 44 m long. It sags 3.8 m when a 56 kg tightrope walker stands at its center. What is the tension in the wire? 1 NIs it possible to increase the tension in the wire so that there is no sag? so far i know you do the inverse sin of (3....

**Chemistry**

The empirical formula of a compound is CH2O and the molecular mass is 180. What is the molecular formula of the compound?

**Chemistry**

What is the total mass of iron in 1.0 mole of FeCO3?

**Chemistry**

A gas has a volume of 1,400 milliliters at a temperature of 20.0 K and a pressure of 101.3 kPa. What will be the volume when the temperature is changed to 40.0 K and the pressure is changed to 50.65 kPa?

**physics**

A hypothetical planet has a radius 2.1 times that of Earth, but has the same mass. What is the acceleration due to gravity near its surface? What equation should i use?

**algebra**

4(3-u)+u=22+2u what does u equal?

**Math**

1. 6,340

**Math**

Please Help!!

**Math**

input (f) 5,10,2,8 Output f(x) 22,47,7,37 My question is what is the rule?

**algebra**

because if you only buy five you wont have enough pencils for the whole class that's why you need 6

**math**

There not rectangles!

**math**

Rational

**help! physics**

Two masses (m1 = 532 grams, m2 = 114 grams) are connected with a rope through a frictionless pulley The ramp has an elevation angle θ = 65.3° and a coefficient of friction μ = 0.184. What are Fll and Fperpendicular for m1? What is the normal force on m1?

**physics**

an atwood machine is set up with m1=234 grams and m2=485 grams. the height of m2 above the floor is 137 cm, and the system is released from rest. the pulley is frictionless. what is the acceleration of this system? what is the tension in the string? how long will it take for m...

**chemistry**

Thank you so much!!! We do not know the pressure or temperature of the classroom though. This assignment was given to us for homework. We are to figure out the numbers and send them to our teacher then use them to do the lab in class tomorrow. Should we use a temp and pressure...

**chemistry**

Alright class. Your task is to produce 175mL of carbon dioxide. You many use anything in class. You have 1 class period to produce your product. You can use as much sodium carbonate and 1.0M hydrochloric acid as needed. ( Remember is stoichiometry lab)

**chemistry**

Your task is to produce 175mL of carbon dioxide. You many use anything in class.

**math**

solve 2sin^2 theta-7 sin theta= -3 for theta, where 0<theta<360 degrees

**math**

write the general solution to 2cos^2x+cos x=1

**physics**

two crates, of mass 75 kg and 113 kg, are in contact and at rest on a horizontal surface. A 727 N force is exerted on the 75 kg crate. If the coefficient of kinetic friction is 0.15, calculate the following: a)the acceleration of the system b) the force that each crate exerts ...

**physics**

what is theta, the x component, and the y component if you know the following standard vector notation: 239 m @ 261 degrees magnitude: 239 m navigational angle: 261 quadrant:3

**reading**

in chronicles of narnia whats the word ROW's sentence

**Math please help!**

the speed of the current in Puget Sound is 5 mph. A barge travels with the current 26 miles and returns in 10 and 2/3 hours. what is its speed in still water?

**math**

the speed of the current in Puget Sound is 5 mph. A barge travels with the current 26 miles and returns in 10 and 2/3 hours. what is its speed in still water?

**algebra**

Add parentheses to 9+8•7-6•5+4•3+2 so that the value of the expression is 105

**physics.**

an object travels 219 meters with acceleration 6.43 m/s^2 over an interval of 2.86 seconds. What are Vi and Vf.

**physics**

A skier is accelerating down a 30.0° hill at a = 4.10 m/s2 a) What is the vertical component of her acceleration? 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 change is 340 m?

**physics.**

The x component of a certain vector is -86.0 units and the y component is +75.0 units. What is the magnitude of the vector?

**physics.**

A jogger runs 59 m due west, then changes direction and runs 83 m due north. What is the distance the jogger travels?

**Human Geography**

How do I calculate the physiological density of Namibia? I can't find it!! HELP!! :)

**english 9th grade**

What are some symbols in 'a journey to the center of the earth' by jules verne

**physics**

Rockets A and B are fired straight upward from rest. Rocket A is launched first and accelerates at 11.2 m/s2. Rocket B is launched 2.10 s after Rocket A and B accelerates at 14.6 m/s2. Solve for the moment in time when the rockets are separated by 484 m. a) how long after rock...

**9th grade**

joslins answer is incorrect jen's is right. 7x^2-9x

**Calculus III**

A particle is moving in R2 according to the law x=t^2, y=t^3 (time is measured in seconds, coordinates in meters). (a) What is the average velocity of the particle over the time interval [1,1.1]? (b) What is the instantaneous velocity of the particle at time t=1?

**PHYSICS**

A flatbed truck of mass 2000kg traveling 20 m/s (about 45mph)carries a load of mass 500kg positioned 3 meters behind the cab. The load is kept on the truck by friction, and the coefficient of friction between the load and the bed of the truck is 0.5. What is the shortest dista...

**Science**

What is the hydrologic cycle?

**Science**

Jake was doing a lab to find the density of metal. Here's his data: mass of the metal sample: 45 grams, volume of metal sample: 4.5 mL. Use his data to determine the density of the metal sample. Can you help? I don't get this.

**Algebra 1 Honors**

What Is 45% of 30?

**Biology 9th grade**

describle plasma membrane

**math (trig)**

from the top of a bridge over the burlington canal, maria looks down at a sailboat at an angle of depression 15 degrees.the bridge is 18m above the water. calculate the horizontal distance from the bridge to the sailboat

**math**

A toy manufacturer is introducin g two new dolls, my first baby and my real baby. IN one hour, the company can produce 8 first baby dolls and 20 real baby dolls. Because of demand, the company produces at least twice as many first babies as real babies. The company spends no m...

**Physics**

Using Planck’s constant as h = 6.63 E-34 J*s, what is the wavelength of a proton with a speed of 5.00 E6 m/s? The mass of a proton is 1.66 E-27 kg. Remember to identify your data, show your work, and report the answer using the correct number of significant digits and uni...

**Chemistry**

An excess of zinc metal is added to 50.0 mL of a 0.100 M AgNO3 solution in a constant-pressure calorimeter. Assuming that the density of the solution is the same as for water, calculate the mass of the solution.

**Algebra 2 Honors**

no, i need an exact answer

**Algebra 2 Honors**

what is the exact value of tan375degrees

**science**

WHich of the following systems will the endocrine system use to send any of it messaqges? THe circulatory The immune The reproductive The excretory

**science**

Feedback inhibition means that an increase in a substance will what?

**college math**

(x)(x-1)(x+1)

**college math**

(3x)(y + 3y + 2)

**History**

I'm writing a comparison paper on two popes. One of them is Innocent III, but I'm not sure what a good comparison for him would be? The catch is that it has to be within the time period: 1100-1272 Any ideas? Thanks!

**3rd grade**

refer to the frequency table to anwser the questions

**science**

100

**calculus**

A box with a square base and an open top is to have a volume of 68in^3 . Neglect the thickness of the material used to make the box, and find the dimensions of the box that would minimize the amount of material used. The width and length of the box are each ___ in. The height ...

**8th grade math**

which ezpresses 3,571,000 in scientific notation?

**Chemistry**

You are given a jar containing a mixture of three different solid substances. The particles of each substance are larger than 0.5 cm in diameter. All you know about the substances is that each is a pure metal. Describe a method for determining the identities of the metals that...

**math**

suppose a pizza slice is a circle sector with a 24 angle and a radius of 15 inches. If a can of pizza sauce will cover 94 square inches of pizza, how many cans of sauce are needed to cover this slice?

**math**

9497463345x932234524?

**gr12 chem**

Both propane and propene react with bromine. State two ways in which these two hydrocarbons can be distinguished in their reaction with bromine

**consumer math**

b 48.87

**history**

what was the situation of african americans in e united states from 1800 to 1860.

**chemistry**

we boiled water in a beaker and put a flask with a small amount of an unknown liquid into the flask then covered it with a lid with a pinhole in it, and we placed this flask in the boiling water bath until the liquid evaporated, then we let it cool and condense.

**chemistry**

during an experiment, if not all of a liquid vaporizes, in a flask with a cap with a pinhole. will the reported molecular weight be too high or low? i was thinking too high because the liquid weighs more.

**geometry proofs **

given: line QO congruent to QN, line NM CONGRUENT TO OP Prove: triangle QMP IS ISOCELES 5. TRIANGLE QNM CONGRUENT TO TRIANGLE QOP WHAT IS THE REASON 7. TRIANGLE QMP IS ISOCELES WHAT IS THE REASON

**chemistry**

We Know that : According to debroglies wavelength : λ = h / mv = 6.627 x 10 -34 J -s / 6.6 x10-24 x 10-3 kg / 1 g x 3.4x 107 mile / hr x 5 793 638.4 m / s / 1 mile / hr = 5.09 x 10-22 m

**Physics**

A 59 g particle is moving to the left at 29 m/s. How much net work must be done on the particle to cause it to move to the right at 38 m/s? .....i have tried two different ways and gotten the wrong answer. Kinetic Energy = 0.5 * Mass * (Change in Velocity)^2. Change in Velocit...

**government**

this item can give a president real leverage in influencing congress?

**French**

Thanks, Ms. Sue. I looked up the spelling, and I've seen it spelled it both ways

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