# Posts by Dan

Total # Posts: 1,191

**physics**

A railroad car with a mass of 1.98 ? 104 kg moving at 2.92 m/s joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.54 m/s. (a) What is the speed of the three joined cars after the ...

**physic**

i still dont understand how to find the v final. Can you show an example @bobpursley

**physic**

i still dont understand how to find the v final. Can you show an example @bobpursley

**physic**

1. A 57 g tennis ball is moving to the left at 36.2 m/s. It collides with a wall and rebounds to the right. The tennis ball is in contact with the wall for 0.107 s and it loses 14% of its kinetic energy during the impact. What is the average force (magnitude & direction) ...

**Geography (solar declination)**

For a assignment we were told to go outside at 12:30 and stand w/ our backs to the sun and measure our shadow. Then for the second part we were asked what would the difference be if we did the same thing on June 21st? (summer solstice). If it were done on June 21st what would ...

**Geography (w/ geometry)**

I am completely confused when it comes to this problem, I don't even know where to start. I tried just seeing how many times the bridge length goes into the building's shadow but still comes up way short. this is the problem (btw in the real life photo the bridge is 1 ...

**Geography (w/ geometry)**

Thanks a lot that did help. on another related note, the second part of the question asks what would the length of my shadow be if I did this on June 21st (summer solstice). Wouldn't my shadow be non-existent because the sun isn't behind me, but directly above me?

**Geography (w/ geometry)**

Well my assignment is asking that I use the equation and info provided to estimate the latitude of Tempe, AZ. which according to google earth is about 33 degrees. so I'm not sure what I am doing wrong. should've posted that originally, sorry.

**Geography (w/ geometry)**

So I'm trying to calculate the latitude of where I am via a few factors. My lesson says I need to know the following: The date of my measurements: 4/3/17 the time: 12:30 my height: 5' 10" my shadows length: 4' 6" It then says first, compute the angle of ...

**Calculus**

Find dy/dt where y = 2 sqrt(2)? 4 and dx/dt = 9 when x = 4. I found the derivative of y=2sqrt(2)-4 but I am stuck as to where to plug in dx/dt

**physics**

The spring is compressed against the floor a distance of 1.6 cm and released. If the spring constant is 60 N/m, what is the magnitude of the spring force acting on the toy at the moment it is released?physics

**physics**

In an arcade game, a 0.12 kg disk is shot across a frictionless horizontal surface by being compressed against a spring and then released. If the spring has a spring constant of 230 N/m and is compressed from its equilibrium position by 8.0 cm, what is the magnitude of the ...

**Chemistry**

Convert the information described below into balanced equation: (a) When a mixture of copper(II) oxide and carbon is heated, elemental copper forms and carbon monoxide evolves into the atmosphere. (b) When a concentrated solution of sodium hydroxide is added to an aqueous ...

**Algebra**

a large pizza costs $6.80 plus $.90 per topping. a different pizza costs $7.30 plus $.65 per topping. How many toppings need to be added to each piece in order for the pizzas to cost the same thing?

**Social Studies 6th grade**

thank you

**Social Studies 6th grade**

What is a modern form of paper.

**Social Studies**

How has paper changed over time.

**math help plz?!**

One of them should be g/mm that's for sure.

**Language/english**

Just tell me what they have alike and how they are different plz.

**Language/english**

In a paragraph, compare and contrast the two forms of poetry haikus and limericks. It should include a specific description of each form. Explain how they are both alike and how they are different.

**language**

thank you

**language**

1:Which word is a conjunction in the sentence: The man quickly but carefully opened the oysters hard shell. A:quickly B:but C:carefully D:opened

**physics**

a uniform plank of lenght 5m and a mass1kg support two masses of 500g and 300g . determine the centre of gravity

**Math**

Graphic designer has offered client 3 options. Poster 1 16x20 inches. Poster 2 1/2 the side of option 1. Option 3 poster that is 5/4 the size of Option 1. The photo on Option 1 is 4x5inches what size would that photo be on Option 2 and Option 3?

**grammer**

find the error?? The client’s hospital stay was prolonged, do to a superinfection. client’s/stay was/do to

**english**

yes had asked bc its a pp thanks

**physics**

@bobpursley could you help me solve it

**physics**

what is the equation that i would use to figure out this answer?

**physics**

how would i find mass?

**physics**

Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 11.2 m long. His speed at the bottom of the swing is 7.4 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 ? 103 N. What is the largest mass that Tarzan can have and ...

**Math**

The flower produced by the morning glory has a polygon appearance. Classify and name the polygon produced by the flower What does classify mean?

**riddle**

Y'all suckas are here because of the kiss 100 thing right? lol

**science**

A car slows down from a speed of 20m/s to rest in 25 seconds.Find its acceleration.

**physics**

A pendulum clock has a pendulum shaft made of aluminum which has a coefficient of linear expansion of 24.0*10^-6K^-1. At 22 degrees celsius the period of the swing of the pendulum is 1.00seconds. If the temperature is reduced to 5 degrees celcius, how much time does the clock ...

**Physics**

The temperature of the Sun’s surface (the so-called photosphere) is about 5500 C. Assume that the Sun’s surface is pretty close to a perfect black-body emitter. (a) At what wavelength does the peak intensity of Sun’s radiation lie? (b) Estimate the total power ...

**Geometry**

I am doing volume and surface areas of 3D figures, and am running into the problem of having to give the exact answers as well as approximate answers. The approximate answers I don't have a problem with but the exact answers are requiring me to get the solution of a ...

**Geometry**

It is saying the answer is 86.96 sq. meters though sorry should've included that in the first place. I just don't understand how they got that answer

**Geometry**

Samantha is buying carpet for her family? room, which is 8 yards by 13 yards. The carpeting is sold in square meters. How many square meters of carpeting will she? need? ? (Use 1 yd ? 0.9144?m.) I am pretty sure 8 and 13 need to be squared and then added together maybe? But I...

**Math**

Start with the integer 4. Subtract 8. From your answer subtract -2, and then subtract 17 from the last answer. What is your final answer?

**Stats**

In each hand of Blackjack, Megan wins $2 with probability 0.1, or wins $1 with probability 0.3, or loses $1 with probability 0.6. Suppose Megan continues to play 100 hands of Blackjack, and assume the outcomes of all plays are independent. (a) Compute the expected payo? after ...

**algebra**

the dollar price for a barrel of oil sold at a certain oil refinery tends to follow the demand equation below where x is the number of barrels of oils on the hand in ( millions ) a) how much should be charged for a barrel of oil if there are 6 million

**Algebra**

Also can you please show how you got the answer???

**Algebra**

New Orleans has highest elevation of 25, lowest -8. Long Beach has highest 360, lowest -7. Which city has an average elevation of -2?

**Math**

If recipe takes 1-1/4 cups of sugar to 2 cups of milk but if you only have 1 cup of sugar then how much milk do you use?

**Math**

At a local music store CDs cost 11.99including tax is the number of CDs purchased proportional to the cost of the CDs

**Physics**

A car will skid to a halt at a uniform rate of -9.4 m/s^2. If you measure skid marks that are 34 m long, with what speed was the car going just before the driver slammed the brakes?

**Math**

-7-14 :(-7)=

**Chemistry**

2NaHCO3 >> Na2CO3 + H2O + CO2

**Math**

If 3/8 of a cup of milk makes 6 muffins , how many muffins does 1 cup of milk make

**hcc**

also is wronh one??

**hcc**

When you add sugar to it, your cup of coffee becomes not only sweet, also fattening. which part is wrong??

**hcc**

we can say them self

**hcc**

which part is wrong? When a person finds itself in stressful situation, it helps to breath deeply.

**hcc**

we can say The bottle of tablets has expired.

**hcc**

The bottle of tablets has an expired expiration date. which part is wrong???

**hcc**

completely under

**hcc**

The physician started to perform the operation but the patient was not yet completely under anesthesia. which part of sentence is wrong?

**hcc**

no which we should use before administered.... since/from/as

**hcc**

A tuberin skin test should be read within 24 hours administered. since-from-as

**Math**

5= 6y; y

**Math**

X= 2; 7x^3 + 4

**accounting**

A term investment of 85000, is madr for 10 years at 4.25% interest. Find the value of the investment at maturity if interest is compoundes quarterly?

**Frederick**

A wire of length 50cm is cut into two parts and each part is bent to form a square. If the total area of the two square is 100cm², find the perimeter of each square.

**Chemistry**

When 28.2706 grams of solute are used to make a 932 mL solution of potassium hydroxide, what is the concentration of the solution?

**Chemistry**

How many grams of solute are required to make a 789 mL solution of calcium acetate with a concentration of 0.0049 M?

**Maths**

There is a lampost of twenty meters in height casting light on a tree 10 metres. How long is the shadow of the tree?

**Physics**

During a free kick at a soccer playoff game a 0.5 kg ball at the peak of the kick 14.7 m above the field had a kinetic energy of 34.0 J. How fast was the ball booted by the player on the field?

**Physics**

A bead of mass m = 41.5 kg is released from point A which is located 5 m above the ground and slides on the frictionless track as shown in the figure. Determine the beads speed when it reaches point C which is located 2.0 m above the ground

**Physics**

A 3.1 kg pendulum bob hangs from a 2 meter string. It is pulled to the side, position A, so that the bob is 98 cm (h on the sketch) above the lowest position, position C. The bob is released and begins to swing. What is its potential energy after it has swung to position B, 34...

**Physics**

A point mass m = 115 g hangs from a string of length l = 1.07 m. Calculate the value of v, the initial speed m should be given at the bottom, so that the string reaches a maximum angle of = 31.4°?

**Physics**

During a free kick at a soccer playoff game a 0.5 kg ball at the peak of the kick 14.7 m above the field had a kinetic energy of 34.0 J. How fast was the ball booted by the player on the field?

**Math**

Which equation represents the relationship in the table below? K . M -----------.------------ 1 . 5 2 . 10 3 . 15 4 . 20 5 . 25 A) m=5k B) k=5m C) m= 5 + k D) k= 5 + m

**maths**

solve the equation log(y)/log(2) + log(y)/log(4) = 6

**english**

Okay thank you :) sorry I meant friend.

**english**

so for #1 , can freidn be a direct object?

**english**

Thanks Ms.Sue, So I don't have any of the direct objects correct? and how can I find the direct object pronoun?

**english**

I have to find out the direct object pronoun and then replace the direct object with a direct pronoun. Please check my answers. 1.My friend sells his new car. (car is the direct object, and I replace car with im not sure. 2. My parents watch the news . ( news is the direct ...

**English**

I need an example of a simile for 'relieved'.

**Calculus**

Let f(x) be defined by f(x) = x/(x - 4). What is the image of f?

**Calculus**

i don't understand what you did

**Calculus**

The function f(x) = x^3 + x an inverse. Compute f^-1(0) and f^-1(2). Hint: Do not try to evaluate f^-1 explicitly.

**business math**

Camille Keegan sells lamps for $105.55 that cost her $75.00. Camille's percent of markup based on the selling price is:

**linear alg**

(a) Find T((ax^2 + bx + c) + (px^2 + qx + r)). (b) Find T(k(ax^2 + bx + c)). (c) Find the image of 3x^2 − 2x + 1. (d) Determine another element of P2 that has the same image.

**Chemistry**

Aqueous sodium sulfide reacts with aqueous calcium chloride to make a solid. The % yield is 85%. Calculate the amount of each reactant needed to actually make 3.0g of the solid.

**Chemistry**

We did a titration of calcium hydroxide lab in chemistry, once with and once with edta, we have to calculate the solubility for both, and the ksp, for the hcl I did (concentration)*(Volume of hcl used) then that answer divided by two divided by the amount of divided by the ...

**Physics**

Someone please help. A radio needs to be tuned to a range of values between 526.5 - 1606.5 kHz. Choose a combination of inductor and variable capacitor values within a tuned circuit that would meet this requirement. Choose practical components from standard vendor web sites (e...

**math**

Construct a 2 × 2 matrix that defines a shear of factor 4 in the y-direction, followed by a scaling of factor 5 in the x-direction, followed by a reflection about the y-axis.

**Math**

Find a single matrix that defines a rotation of the plane through an angle of π/6 about the origin, while at the same time moves points to five times their original distance from the origin.

**Linear Algebra**

Yeah I understand that part, but what about projection onto vector u?

**Math**

Did you manage to figure out this assignment? I have the same portfolio assignment and it is super confusing!

**Writing**

Where is somewhere I can get a definition from that I can cite as a scholarly source? My prof said that we can't use an online dictionary.I need to find the definition of universal health care if that matters

**Chemistry**

I did a lab, an kinetics lab (iodide clock) and in my lab report I have to calculate the initial rate in mol L-1 s-1 and I'm not sure how to do that. I have the [I-] and [S2O82-] in mol L-1 already. The reagents are [KI] [NaCl] [Na2S2O3] [Na2SO4] [K2S2O8].

**U.S History**

Are advertisements valuable primary sources/reflections of culture? Why or why not?

**Chemistry**

27% of heat produced by the stove's gas burner is transferred to the soup in the covered pot, the rest is lost. Determine the total mass in grams of methane that must be burned to heat 800 ml of water from 22 to 90 degrees C. The density is 1.08 g/ml and the specific heat ...

**Chemistry**

I have to write the rate law for two elementary reaction equations A ) 2a+b>c+d B ) X+Y>Z I'm pretty sure it's just k[ A ][ B ] and k[ X ][ Y ] but does the coefficient affect it in this case? is it [ A ]^2 ?

**Chemistry**

PART 1 >>Trial 1 Reactant Solution A 10 ml I^-, 5.0 ml S2O3^2- Reactant Solution B 10 ml S2O8^2-, 1 ml starch time to react = 10 seconds >>Trial 2 Reactant Solution A 10 ml I^-, 5.0 ml S2O3^2- Reactant Solution B 5 ml S2O8^2-, 1 ml starch time to react = 20 seconds...

**Chemistry**

I looked part 2 for a bit and by looking at the slow step and using that to figure out the rate law I think it might be mechanism 2, would this be right?

**Chemistry**

PART 1 >>Trial 1 Reactant Solution A 10 ml I^-, 5.0 ml S2O3^2- Reactant Solution B 10 ml S2O8^2-, 1 ml starch time to react = 10 seconds >>Trial 2 Reactant Solution A 10 ml I^-, 5.0 ml S2O3^2- Reactant Solution B 5 ml S2O8^2-, 1 ml starch time to react = 20 seconds...

**Chemistry**

I have to write the rate law for two elementary reaction equations A ) 2a+b>c+d B ) X+Y>Z I'm pretty sure it's just k[ A ][ B ] and k[ X ][ Y ] but does the coefficient affect it in this case? is it [ A ]^2 ?

**Math**

I need to find the limit as x goes to 3 of (1-sqrt(x-2))/(x-3)), I know the answer is -1/2 but I have no idea how to get to the answer, and help would be appreciated