# Posts by tristan

Total # Posts: 141

**physics **

Oops I meant to put it under physics :(

**chemistry **

At 10 degrees C a cannon fires a shell at 1324m/s a) how fast is the shell traveling relative to the soundwave of the explosion? b) how far away from the cannon is the observer how sees the shell pass by 2s before the sound of the explosion arrives? I don't understand a ...

**Physics**

Oh I'm dumb, I don't know why I would assume ice is at 100. But even if you assume it's at 0 my method still doesn't work

**Physics **

How much heat is required to melt 2.4kg of ice at 0 degrees Celsius? So here's what I did: Q=mct = 4200x2.4x(100-0) I assumed the ice was at 100 but I'm pretty sure you're not allowed to do that. Q=mlf 1008000=2.4Lf So I ended up getting the wrong answer, I'd ...

**physics **

1.5 kg of an unknown liquid at a temperature of 17 degrees Celsius is added to 2kg of water at 50C. The final temp of the mixture is 45C. Assuming no heat is lost to the environment, determine the specific heat capacity of the unknown liquid. So I assume you would do Qmct = ...

**Physics **

A. A 45kg gymnast launched herself from a vault with a speed of 1.8m/s.she lands upright on the ground 125 cm below at what speed will she hit the ground? B. On landing she bends her knees through a height of 0.15m. Detained the average force exerted by her legs during the ...

**Physics **

a . rather then taking the elevator a a 65kg student decided to climb 276m vertical height of stairs to the observation deck of the effiel tower. How much work does the student do against gravity climbing to this level? b. It's estimate that 1kg of fat will provide 3.8x10^...

**Math**

There are 4 sections of seat in the playhouse theatre. Each section has7 groups of seats.each group has 25 seats. How many seats are there in the theater? 25Ã—7=175 seats

**math**

Juanita is making necklaces to give as presents she plans to put 15 beads on each necklace beads are sold in packages of 20 what is the least number of packages she can buy to make necklaces and have no beads leftover over

**Chemistry**

"Calculate the enthalpy of vaporization of water given that, when 5.00 grams of steam (gaseous H2O) at 100°C was introduced into a beaker containing 500 grams of water at 20.0°C, the temperature rose to 26.2°C." q_H2O(l) + q_H2O(g)= E nΔH_vap + ...

**chemistry**

The gas in a fixed container was at STP before is was lifted by a balloon into the atmosphere. What would the new pressure be in kPa if the temperature at a higher altitude was 268 K? a .00138 kPa b 103 kPa c 99.4 kPa d .982 kPa

**3rd grade math**

We got 5/8. Is that correct? Thank you so much...

**3rd grade math**

Bryan has 3 nickels, 3 dimes, and 2 quarters. What fraction of the coins is either a dime or a quarter?

**Physics**

samuel drives his bicycle east at a velocity of 10.0 m/s. he then increases his speed in the same direction to 25.0 m/s in 3.50 s. what is his average speed

**History**

Thanks

**History**

Is it b?

**History**

No

**History**

I think it's d

**History**

Which of the following best describes why the port of New Orleans was so important to the South during the Civil War A) it was the last stronghold left in the south in 1864 when it became the capital of the Confederacy B) it was one of the largest Ports in the south and ...

**algebra**

Consider that the half-life of Polonium-210 is 140 days.What approximate daily percentage of decay does Polonium-210 demonstrate?% (Round to two decimals.)(Hint: use the Rule of 70 backwards by dividing by the half-life period instead of the rate.) What percentage of the ...

**Algebra**

There were 170 tickets sold in 1 day and amount money made $1475.00. Adult tickets cost $10.00 and children $7.00. How many adult and children tickets were sold.

**Geometry**

The area of triangle ABC is _____. A. 60 u2004-05-02-04-00_files/i0060001.jpg B. 65 u2004-05-02-04-00_files/i0060002.jpg C. 130 u2004-05-02-04-00_files/i0060003.jpg D. 150 u2004-05-02-04-00_files/i0060004.jpg

**Algerbra**

y=-3x+10-x-2

**FIN370**

The present value of this investment is $3.33 per year (if you are trying to pay a little each year proceeding the last) Hope this helps and if I'm not correct you should see someone correct me pretty quickly.

**Algebra 1**

I am fairly sure the answer would be represented by the following polynomial: -pi(24x)^2 But if anyone else comes up with something they're completely sure is correct, go with that answer instead.

**grammar**

Not to be a Grammar Nazi or anything, but I'm pretty sure it's spelled grammar.

**Language arts check work**

2 was A and 5 was A lol after rereading it I get that last one!! Why would anyone welcome dismal news dang it!

**Language arts check work**

1. In these lines from “Life Doesn’t Frighten Me,” which words rhyme? Panthers in the park / Strangers in the dark / No, they don’t frighten me at all. A.Panthers, park B.Strangers, dark C. park, dark <-----This one D. dark, all 2. The speaker in “...

**Physics-Atwood's Machine**

A 5 kg block rests on a horizontal surface. Determine the horizontal force required to accelerate the block at 3 m/s^2. The frictional coefficient is 0.5. Fnet=mass(accer.) FH=5kg (3m/s^2)= 15N I don't know what to make of the frictional coefficient

**Language Arts**

They have no clue what the answer is it is <culture>. I am a language teacher

**Math**

At a T.I concert, the ratio of the number of girls to the number of boys is 2:7. If there are 250 more boys than girls, how many girls are at the concert?

**Electro 1**

Two resistors Ra= 1.95 ohms and Rb = 0.05 ohms are connected in parallel and take a total of 50A. What is the current trough each resistor.

**Electro 1**

A 6 ohms load is connected to a 119.6volts source through a pair of 0.25 ohms conductors. calculate a) the load current and voltage. b) the voltage drop in the wires.

**Math**

A tree is 18 feet tall and casts a shadow that is 22 feet long. How fat is it from the end of the shadow to the top of the tree

**physics**

In the Millikan experiemnt, what error might result if only a few oil drops were used, or if all the oil drops contained an even number of charges.

**math**

The surface area of this rectangular prism is 256 square millimeters. What is the value of l? the given numbers are h=4 w=8

**physics**

Two electrons start at rest with a seperation of 5e-12 metres. Once released, the electrons accerelate away from each other. Calculate the speed of each electron when they are a very large distance apart.

**science- Physics**

Two electrons start at rest with a seperation of 5e-12 metres. Once released, the electrons accerelate away from each other. Calculate the speed of each electron when they are a very large distance apart.

**english**

I have to classify this sentence: Wow!(I) I(sn)/saw(v) a(a) falling(adj) meteor(do) clearly(adv) during(p) the(a) night(op). Is this correct?

**physics**

A 2000 kg is released from a height 20m, and hits a 700kg car at the bottom of the swing. The car is sent horizontally 30, before coming to a stop, and the ball is going 12m/s immediately after they hit. What force of friction is acting between the car and the ground?

**physics Momentum and impulse**

You want to close an open door by throwing either a 400g lump of clay or a 400g rubber ball at it. You throw at the same speed, but the clay sticks to the door and the ball bounces off it. Which works bette?

**Math- Vectors**

Whta is the equation that has the same x-intercepts as L1:[x,y,z]= [3,5,-1] + t[4,-10,2] and is perpendicular to L2:[x,y,z]= [5,8,-2] + s[3,7,1]

**Vectors**

ok thx

**Vectors**

I think we have to assume friction is not important and the object is on earth.

**Vectors**

An object on a ramp is being held in place by a rope attached to the top of the ramp. If the tension in the rope is 215 N, what is the mass of the object.

**Advance Functions**

The population of a small town is modeled by the function p(t)=20(4t+3)/2t+5, where P(t) is the population, in thousands, and t is time, in years, since the start of 1990. The town will need its own transit system if the population exceeds 50,000. Will the town's ...

**Vectors**

Consider the lines L1: [x,y,z] = [4,-2,k] + s[1,1-3] +t[2,3,1] Determine a value of k that is 10 units away from the plane with the equation 10x-7y+Z-28=0

**math**

Find the equation of the plane equidistant from the points (1,8,3) and (4,10,7)

**math**

Find the equation of the plane equidistant from the points (1,8,3) and 94,10,7)

**Physics (fix)**

In a string and pulley problem, will friction increase or decrease the tension.can you please explain if you can?

**physics-**

Thx for Anne for this answer. Just post this here if someone wonders to here.

**physics-**

Adding friction to a pulley problem, regardless of if a mass in on an incline or not, will almost always increase the tension in an atwood machine- type pulley problem. This is because friction will always oppose motion, so there will be more forces working against the force ...

**physics-**

In a string and pulley problem, will friction increase or decrease the tension.can you please explain if you can?

**science**

1. B 2. C 3. C 4. A 5. D These are PROBABLY the right answers. I am 80% sure these are the right answers.

**science**

If you do have the same questions as me #3 would be C. Because heterozygous cow crossed with a homozygous cow the Punnett square would be 1 B at the top left, 1 b at the top right and the left would just be b and b.

**physics**

32.88

**Physics**

A student throws a baseball at a large gong 45 m away and hears the sound of the gong 1.35258 s later. The speed of sound in air is 330 m/s.What was the average speed of the base- ball on its way to the gong? (For simplicity, assume its trajectory to be a straight line.) ...

**Physic**

A 61-kg skier, coasting down a hill that is an angle of 23 to the horizontal, experiences a force of kinetic friction of magnitude 72N. The skier's speed is 3.5m/s near the top of the slope. Determine the speed after the skier has travelled 62m downhill. Air resistance is ...

**Algebra 2**

Solve for x under the assumption that x > 0. Enter your answer in interval notation using grouping symbols. x - (10/x) < 9 I need someone to show me how to work through this type of problem, I don't understand it.

**Algebra 2**

Find the equation of the asymptotes for the hyperbola defined by the equation: ((y + 4)^2 / 36) - ((x - 3)^2 / 25) = 1

**Algebra 2**

Solve the equation |2x − 5| £ 9

**Algebra 2**

A 14 gram sample of a substance that's used to preserve fruit and vegetables has a k-value of 0.1092. Find the substance's half-life, in days. Round your answer to the nearest tenth.

**science- physic please help**

Well I did a Pendulum lab. The length of my pendulum on a string was 95 centimeters and it took 19.15 seconds to complete the 10 cycles. Please help me to find the frequency.

**math**

Two angles between 0 degrees and 360 degrees have a tangent undefined. What are the angles? Why is the tangent undefined for each of those?

**math**

How do I do this? Without a calculator, determine two angles between 0 degrees and 360 degrees that have a cosine of negative square root 3 over 2.

**Math**

Solve the proportion. Where necessary, round to the nearest hundredth. 8 over 2 = x+3 over 4

**math quiz tomorrow**

I am having problem graphing with these two equations 2(3^x)-3 and –3(3^–x)

**math**

a soccer ball is kicked from the ground. after travelling horizontal distance of 35m,it just pass over a 1.5m tall fence before hitting the ground 38m from where it was kicked. Determine the equationi of a quadratic function that can be used to model the parabolic path of the ...

**ratio and rate**

hummingbird has a wing beat of 200 beats per second. a bout how many wing beats would it have in 3 minutes

**math**

A recipe for 24 cookies calls for 6 tablespoons of sugar. If you make 36 cookies and use 10 tablespoons, will the cookies taste the same? Explain

**math**

A package of spaghetti weighs 266 grams. How many ounces does the package weigh? 1 oz = 28 g

**math help me pls**

these answers are wrong 2,3,and 4 are wrong number 2. is 2x+11, number 3. is 15y+14, and number 4 is 27(3-p)

**Physics**

A rotating cylinder 7.95 kilometers in radius is designed to be used as a space colony. With what period must it rotate so the residents on it feel as heavy as they would on Earth?

**social studies**

in the mid-1990s,investers backed many ____ in hopes of making a huge profit.

**math**

What is 7/8 divided by 3/9?

**Experimental Chemistry**

(Experiments in synthetic chemistry) For heating under reflux, must the solvent level in the round bottomed flask be above the oil level (in the hot oil bath)? Why? Thanks.

**sCIENCE PLZZZZZZZZ HELP**

B a D D i got a 100 percent i took the same test

**math**

the teacher told each student to bring in 3/8 yard of string. they all brought in a total of 13 yards. how many students will be in the class

**science**

True or false, at 25 degrees celsius H+ ion concentration in pure water is 7 x 10^ -7 mole per liter?

**Geometry**

A circular flower bed is sectioned off. The arc intercepted by the 120 degree central angle is to be bordered with marigolds. The garden has a diameter of 63 inches. Circumference = Pi * diameter, Pi = 22/7. If you plant the marigolds about eight inches apart what is the least...

**social studies**

how to find the mummification process.

**Grade 6 math**

I have an input 25 and output of 15 the next set is input of 30 output of 18 how do I figure out the rule

**Mediation**

How does a human services worker integrate the use of mediation, or third party neutrality, when he or she also serves as an advocate for the client and is an employee of the agency

**math**

which is greater 1.8 or 1.08

**math 5th grade**

I need to know how to solve 6- 3/4= Not sure how to get the answer??

**Accounting III**

What arguments can be advanced in favor of treating fixed manufacturing overhead costs as product costs? What arguments can be advanced in favor of treating fixed manufacturing overhead costs as period costs? Which arguments do you find to be the most valid? Explain.

**math**

Thanks.

**math**

Dana buys a piece of carpet that measures 20 square yards. Will she be able to completely cover a rectangular floor that measures 12 ft 6 in. by 16 ft 6 in.?

**pre algebra**

1/2 divided by 2/3=

**American History**

Cant figure this one out... How did Ferdinand and Isabella’s political strategies and religious beliefs shape the encounter between early Spanish explorers and the indigenous peoples of the Americas?

**History**

thanks

**History**

What is the significance of providing an official charter, such as was given to Sir Walter Raleigh by Queen Elizabeth?

**please please help**

Nico is saving money for his college education. He invest some money at 8%, and $1300 less than that amount at 5%. the investments produced a total of $234 intrest in 1 yr.How much did he invest at each rate?

**Math Help Please**

Can somebody help me i still don't get how to do this?

**Math Help Please**

would it be 23 or 2300

**Math Help Please**

Nico is saving money for his college education. He invest some money at 8%, and $1300 less than that amount at 5%. the investments produced a total of $234 intrest in 1 yr.How much did he invest at each rate?

**MATH**

3040...okay thanks

**MATH**

I got x=330 what do i do from there. How do i get the speed of each plane from there?

**Math**

6<1-7m<13

**chemistry**

-Suppose you carry out TLC separation of acetaminophen and ibuprofen on silica ggel using a nonpolaar developing solvent. which should have a higher Rf? -Assuming that the drug components whose spots you identified dissolved completely when you stirred the tablet with 1:1 ...