# Posts by Ben

Total # Posts: 1,001

**Science**

temperature

**physics**

A 820-{\rm kg} sports car collides into the rear end of a 2700-{\rm kg} SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 3.0 {\rm m} before stopping. The police officer, estimating the coefficient of kinetic friction between ...

**physics**

A 820-{\rm kg} sports car collides into the rear end of a 2700-{\rm kg} SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 3.0 {\rm m} before stopping. The police officer, estimating the coefficient of kinetic friction between ...

**math**

determine the angular velocity if 11.3 revolutions are completed in 3.9 seconds

**algebra**

25

**office procedures**

listen to her and go back to work

**math**

Mr. spoke earns 800 + 7% of his sales. so we can show this by his total pay- P = 800+ 7%x monthly sales P= 800 + 7%x9200 P= 800 + 644 P= 1,444 Therefor last month Mr.Spoke earnt $1444

**math**

A girl cycles from her house to a friend’s house at 22 km/h and home again at 26 km/h. If the round trip takes 54 min, how far is it to her friend’s house? Round your answer to the nearest 0.1 km. [

**MATH**

n a right triangle ABC, C = 90°, A = 41° and c = 67 cm. Find b. (Round your answer to the nearest whole number.) b =

**Investments**

A firm has current assets that could be sold for their book value of $7 million. The book value of its fixed assets is $57 million, but they could be sold for $99 million today. The firm has total debt with a book value of $32 million but interest rate declines have caused the...

**Investments**

An analyst gathers the following information about Meyer, Inc.: • Meyer has 1,300 shares of 8% cumulative preferred stock outstanding, with a par value of $240, and liquidation value of $250. • Meyer has 22,400 shares of common stock outstanding, with a par value of...

**Investments**

An analyst gathers the following information about Meyer, Inc.: • Meyer has 1,300 shares of 8% cumulative preferred stock outstanding, with a par value of $240, and liquidation value of $250. • Meyer has 22,400 shares of common stock outstanding, with a par value of...

**Investments**

A firm has current assets that could be sold for their book value of $7 million. The book value of its fixed assets is $57 million, but they could be sold for $99 million today. The firm has total debt with a book value of $32 million but interest rate declines have caused the...

**science**

How much total, KE and PE does a roller coaster have when it has a mass of 750 kg, and is 5m above the ground?

**math**

(x-1, y+3) apply to all 3 points

**math**

make a proportion and cross multiply to solve for x (yards/chairs)=(yards/chairs) (6yards/3chairs)=(x yards/ 7 chairs) (6yards x 7 chairs)/(3 chairs)= x (42/3)=x 14=x so 14 yards

**math**

a=p(1+r)^t a=2,000(1+(1.75/100))^8 don't have a calculator on me

**Chemisty**

The compound potassium carbonate is a strong electrolyte. Write the reaction when potassium carbonate is put into water

**Physics**

Under the spreading chestnut tree the village blacksmith dunks a red-hot horseshoe into a large bucket of 22*C water. How much heat was lost by the horseshoe in vaporizing .00100 kg. of water?

**Physics**

A mouse travels along a straight line; its distance from the origin at any time is given by the equation. x= (8.1 cm * s^-1)t-(2.7cm * s^-2)t^2 A) Find the average velocity of the mouse in the interval from t= 0 to t= 1.0 . value=?; unit= ? B)Find the average velocity of the ...

**Physics**

i for got to add the "t" A)t=0 to t=10 B)t= 0 to t= 4.0

**Physics**

A mouse travels along a straight line; its distance from the origin at any time is given by the equation. x= (8.1 cm * s^-1)t-(2.7cm * s^-2)t^2 A) Find the average velocity of the mouse in the interval from = 0 to = 1.0 . value=?; unit= ? B)Find the average velocity of the ...

**physics**

How does the water pressure .5m below the surface of a small pond compare to the pressure .5m below the surface of a large lake?

**math**

mode is a number that appears the most... if two numbers repeat the same number of time you write both

**math**

you made the mistake 2b=h/A

**Physics**

Problems 7–9 are related to the following scenario: We have a collection of 5 different mass/spring combinations that all have different properties. All of them have some damping and all have the same mass. The properties are summarized in the table below: Name Natural ...

**math**

27x3=71 each triangle is an equillateral, all sides equal 71/3=27 would be each side length

**math**

A=P(1+r)^t, A=1200 P=5300 R=7.2/100, now solve for t

**Pre-Calc-Please check**

1. is correct 2. is correct

**Physics**

1. If a mass on a spring and a pendulum have the same period on the moon where the gravity is about 1/6 of its value on the Earth, which one will run faster on the Earth? a. The mass on the spring. b. The pendulum. c. They will both run the same. d. It depends on which one has...

**Chemistry**

If the density of a substance is 15.2 g/mL, what is the density in cg/kl?

**Math**

convert feet to inches: 10 feet = 120 inches 15 feet = 180 inches get the area of the floor: 120in x 180in= 21,600in^2 divide the area of the floor to the area of the tile: area of the tile is "9in^2" 21600in^2 divided by 9in^2 is 2,400 tiles.

**Physics**

Water flows at a speed of 15 m/s through a pipe that has a radius of 0.40 m. The water then flows through a smaller pipe at a speed of 45 m/s. What is the radius of the smaller pipe?

**Physics**

Fg/Fb=p(row)(object)/p(fluid) 9.81/Fb=.78/1 =7.65 N

**physics**

A light spring of constant k = 156 N/m rests vertically on the bottom of a large beaker of water (Fig. P9.34a). A 4.10 kg block of wood (density = 650 kg/m3) is connected to the spring and the block-spring system is allowed to come to static equilibrium (Fig. P9.34b). What is...

**chemistry**

A 15.0 ml sample of an unknown HClO4 solution requires 50.3 ml if 0.101 M NaOH for complete neutralization. What was the concentration of the unknown HClO4 solution? The neutralization reaction is: HClO4(aq)+ NaOh(aq)yields H2O(l)+ NaClO4 (aq) If anyone can help me to set this...

**Chem**

A gas generator is constructed to collect the CO2(g) evolved from a reaction. during lab we set up the CO2 generator by placing 10ml of 3 M HCL in a 200mm test tube. then slide the 75mm test tube into the 200mm test tube without splashing any of the acid into the sample. The ...

**calculus**

ahh thank you so much

**calculus**

So from a previous post I asked, "f(x)=(1+x) what is f'(x) when x=0?" and someone replied, "the derivative of f(x)=x+1 is f'(x)=1 so your answer would just be 1" Now my question is why!? it doesn't matter what x is? f'x when x=238423904 will...

**Math Garde 3**

2x9 and 5x9 will always be even numbers? I think that's what they're after.

**Spanish**

Correction 1.A nosotros les duele la cabeza.

**Spanish**

I had to write sentencesabout an ache in a certain body part with indirect pronoun . There were pictures provided and the first part of the sentence like "A mi amigo" and we had to fill in the restCould you check, please 1. pain in head A nosotros nos duele la cabeza...

**Spanish**

Please check-I have to rewrite with an indirect object pronoun 1. Escribo una carta a mi abuela. Le escribo una carta a mi abuela. 2.Mando una tarjeta postal a mis amigos. Les mando una tarjeta postal a mi amigos.

**calculus**

so it doesn't matter what x is? f'x when x=238423904 will also be 1? For some reason I thought that you would have to plug in 0 for x.. like f(x) = (1+x) and when x = 0, f(0) = (1+0) = 1. So f'(0) would = 0. Can anybody help me rationalize why this is wrong? thanks...

**calculus**

f(x)=(1+x) what is f'(x) when x=0

**btec fun**

it wil go ro the ski

**physics**

24.2 / 5.1 =

**physics**

A 42-kg pole vaulter running at 14 m/s vaults over the bar. Her speed when she is above the bar is 1.7 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.

**physics**

A model rocket is launched straight upward with an initial speed of 45.4 m/s. It accelerates with a constant upward acceleration of 2.98 m/s 2 until its engines stop at an altitude of 150 m. What is the maximum height reached by the rocket? The acceleration of gravity is 9.81 ...

**calculus**

lim as approaches infinity of sin(pie.x/2-3x) i need the work and answer find the limit

**physics**

How long is the rocket in the air? Answer in units of s

**physics**

When does the rocket reach maximum height? Answer in units of s

**physics**

How long is the rocket in the air? Answer in units of s

**physics**

When does the rocket reach maximum height? Answer in units of s

**physics**

A model rocket is launched straight upward with an initial speed of 45.4 m/s. It accelerates with a constant upward acceleration of 2.98 m/s 2 until its engines stop at an altitude of 150 m. What is the maximum height reached by the rocket? The acceleration of gravity is 9.81 ...

**physics**

A helicopter is rising at 5.2 m/s when a bag of its cargo is dropped. The bag falls for 2.5 s. what is the bags velocity

**Math**

how do i approach this problem though so i can get the right answer

**Math**

If C represents a variable, then which of these expressions has a coefficient of 3 ? a) C + 3 (b) 3 C + 1 (c) 2 C − 3 (d) 5 − 2 C (e) 3 − 2 C

**Math**

Its decimal i believe cause fractional notations are converted into decimal notations

**Chemistry**

Ejected neutrons sustain the fission reaction by serving as reactants to split additional fissionable nuclei, which roduce additional neutrons, which can slit additional dissionable nuclei, and so on. The result is a what???

**Mr. bobpursley**

Thank you for your time and frankness. I agree with you.

**chemistry f/u**

Thank you Mr. bobpursley. I am still unclear on a few things. massethanol*Ceth(Tf-7.7)+masswater*Cwater*(Tf-27.1)=0 solve for Tf 17.75g ethanol x(Tf-7.7)+31.6g water x (Tf-27.1)=0 This is the algebra that I do not know how to derive to move to the next step. Do I add it all to...

**Chemistry**

New problem. Any assistance is greatly appreciated. 22.5 ml of ethanol (density=0.789 g/ml) initially at 7.7 deg. C is mixed with 31.6 ml of water (density=1.0 g/ml) initially at 27.1 deg. C in an insulated beaker. Assuming that no heat is lost, what is the final temperature ...

**Chemistry**

New problem. Any assistance is greatly appreciated. 22.5 ml of ethanol (density=0.789 g/ml) initially at 7.7 deg. C is mixed with 31.6 ml of water (density=1.0 g/ml) initially at 27.1 deg. C in an insulated beaker. Assuming that no heat is lost, what is the final temperature ...

**Dr. Bob**

Thank you kind sir for guiding my work on the last question. You gave me the means to answer the question correctly without giving me the answer. Your expertise is greatly appreciated. If you tutor online, I would gladly pay for your guidance if you are interested

**Chemistry**

Thank you very much for your assistance preemptively. My question has to do with law of conservation of mass. A 50g sample of iron reacts with 21g of oxygen to from how many grams of iron oxide? Is the answer maybe 71g or 29g. This is stumping me.

**chemistry**

This has to do with law of conservation of mass I believe but it stumps me. 50g or iron reacts with 21g of oxygen to form how many gram of iron oxide? Is the answer 71g or 29g

**Pre-Calc**

Find [4(cos115+isin115)]^6

**calculus**

Why did the 2ðx^2+108/x^2 become 2ðx-108/x^2

**calculus**

A large soup can is to be designed so that the can will hold 54pi cubic inches of soup. The radius of the can is "x" inches and the height of the can is "h" inches. Find the values for the radius and the height such that the amount of metal needed is as ...

**MATH**

1) During the two months of the summer holiday, you find a summer job that pays $160 per week with a $10 a week raise. How much money will be made by the end of the summer? 2 Your grandmother offers you $1 on the first day of March break and offers to double it each day of the...

**derivative**

Find the derivative. 11) f(t)=(1)/(sqrt(8t-3)) 12) g(t)= ((4t-3)^2)/ ((5t+1)^4) Thanks.

**calculus**

18) The demand equation is x + 1/6p - 10+0. Compute the elasticity of demand and determine whether the demand is elastic, unitary, or inelastic at p=50. a) 5; elastic b) 1/9; inelastic c) 7/6; elastic d) 6; elastic I choose answer A. Is that correct?

**maths**

The mean weight (1.0042kg) of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or more. Options...

**maths**

The mean weight (1.0042kg) of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or more. Options...

**maths**

The mean weight (1.0042kg) of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or more. Options...

**physics**

i need a mathematical relationship between density and height

**Algebra 2**

Find the distance between the points (12, 8) and (4, 2). 100 units 14 units 10 units –10 units Find the midpoint of the points (3, 1) and (7, –5). (1, 6) (2, 1) (2, –3) (5, –2) Find the vertex and focus of the parabola whose equation is 4y = x2 + 4. V(0, 4...

**Algebra 2**

1. Find the midpoint and the distance between the points (8,–6) and (13, 4). 1. (4, –3), 10 units 2. 3. 4. (10, –1), 9 units 2. Find the vertex and the focus of the parabola with the equation 4y = x2 – 12x + 52. 1. V(6, 4), F(6, 5) 2. V(6, 4), F(7, 4) 3. V(...

**Math Help**

The fare for riding in a taxi is a $3 fixed charge and $0.80 per mile. The fare for a ride of d miles is $6.75. Write an equation that could be used to find d.

**Algebra**

Par Manufacturing manufactures steel rods. Suppose the rods ordered by a customer are manufactured to a specification of 0.5 in. and are acceptable only if they are within the tolerance limits of 0.49 in. and 0.51 in. Letting x denote the diameter of a rod, write an inequality...

**math**

well for the first one i'm pretty sure it is a parabola, and i'm confused on how you would find the vertex focus and directrix

**math**

how would you solve these equations? y^2+2y-2x+5=0 and (x^2/16)-(y+1)^2/(25)=1 thank you!

**Chemistry**

8368J

**science**

Whats a good reason for dissecting a heart and what would be the purpose?

**chemistry**

given 14g silver oxide, how much silver can be made?

**stats**

use technology to find the P-value for a two tailed test with n=28 and a test statistic t=2.032 P-value =???? Help please! i don't understand this

**math**

Thanks. So no matter what the times I have to subtract the starting time from the ending time - right?

**math**

if a game is started at 7:48am and finishes at 10:58am ... how do I figure how many hours and minutes it took to finish the game?

**Statistics**

A certian company enjoyed 3.5% profits in year 1 over its revenue in Year 0. In Year 2, it enjoyed 5.75% profits over Year 1. In Year 3, it posted 1.25% profits over Year 2. What single, constant profit over this period of years would have produced the same profit? The teacher...

**physics**

A particular guitar string is supposed to vibrate at 192 Hz, but it is measured to actually vibrate at 212 Hz. By what percent should the tension in the string be changed to get the frequency to the correct value?

**Chemistry HELP!!**

A sample of nicotine weighing 0.3204 g was vaporized in a flask with a volume of 487 mL. This sample exrted pressure of 74.3 mm Hg at 20 degrees C. What is the molar mass of nicotine? I know this has to do with N=P*V/R*T. and 1 atm=760 mm Hg. Please help and show work. ...

**Chemistry**

so then would i take: .284 L/44 g/mol =.006 then .006*100 g/mol =.645 then take .645/1.506 = .429 ---->.429 * 100 = 42.9% is this how i would get the answer?

**Chemistry**

a sample of limestone and other solid materials is heated and the limestone decomposes to give calcium oxide and carbon dioxide: CaCO3 ----> CaO + CO2 a 1.506 g sample of limestone containing material produces 284 mL of CO2 at STP. what is the mass percent os CaCO3 in the ...

**Chemistry**

A sample of nicotine weighing 0.3204 g was vaporized in a flask with a volume of 487 mL. This sample exrted pressure of 74.3 mm Hg at 20 degrees C. What is the molar mass of nicotine? I know this has to do with N=P*V/R*T. and 1 atm=760 mm Hg. Please help and show work. ...

**Chemistry DrBob**

I don't understand how you get the answer. I really don't understand any of this, how do I set it up with the numbers? once i get how to do this, then i feel i will understand how to set these up from here on out. so if you could, show all your work, thanks (A). A ...

**Chemistry**

(A). A reaction with a known q is performed in a bomb calorimeter and is found that 10.0 kj of heat is required to raise the temperature of the calorimeter by 2.15 degrees C. calculate the heat capacity of the calorimeter. (B). When 1.00 g of C2H6(g) is burned in the bomb ...

**chemistry**

a reaction witha known q is performed in a bomb calorimeter and is found that 10.0 kj of heat is required to raise the temperature of the calorimeter by 2.15 degrees C. calculate the heat capacity of the calorimeter.

**chemistry**

a reaction witha known q is performed in a bomb calorimeter and is found that 10.0 kj of heat is required to raise the temperature of the calorimeter by 2.15 degrees C. calculate the heat capacity of the calorimeter.

**math**

what would be the length of a shadow cast by a 50 foot high building?