
A block of copper of unknown mass has an initial temperature of 66.7 ∘ C . The copper is immersed in a beaker containing 95.5g of water at 20.6 ∘ C . When the two substances reach thermal equilibrium, the final temperature is 26.0 ∘ C .What is the mass of the...

For the linear program Max 2A + 7B s.t. A + B greater than or equal to 12 2A + 2 B less than or equal too 26 B greater than or equal to 1 A, B greater than or equal to Which of the following would be found in the correct standard form? A. YES B. NO A + B  S1 = 12 2A + 2B  S2...

an object is undergoing uniform circular motion. which of the following statements is true? a. the velocity is constant b. the acceleration is constant. c. the a is constant but v varies. d. the v is constant but the a varies. E. both a and v vary.

Selina has a homework consisting of 4 questions.In each question,she needs to find the value of each power.When she turns in her homework,her teacher says she got 3 correct answers which of the following values did she calculate incorrectly? a.(3)0 = 1 b.(3)2 = 9 c. 3 2 =9 ...

A 275g ball is resting on top of the spring that is mounted on the floor. You exert a force of 325N on the ball and it compresses the spring 44.5cm. If you release the ball from the position, how high above the equilibrium position of the springball system will the ball rise?


hey so this is for rate law if the first step is the slow step. it is also an equilibrium. I just want to check if this is right. [Acetophenone]+[Ethoxide]<k1> k1 [Intermediate]+[Ethanol] Just want to make sure this will be the rate law: k1/k1 [Acetophone][Ethoxide...

1 In the reaction of potassium permanganate and iron salt in acidic medium, how many moles of manganese reacted with iron? 2 moles of Mn with 1 mole of Fe 1 mole of Mn with 5 moles of Fe 1 mole of Mn reacts with 1 mole of Fe 5 moles of Mn reacts with 1 mole 2 Which of the ...

It is often suggested that the Bank of Canada try to reduce the inflation rate to zero. If we assume that velocity is constant, does this zeroinflation goal require that the rate of money growth equal zero? If yes, explain why. If no, explain what the rate of money growth ...

In the photoelectric effect, suppose that the intensity of the light is increased, while the frequency is kept constant. The frequency is greater than the minimum frequency f0. State whether each of the following will increase, decrease, or remain constant, and explain your ...

One kilowatthour (kWh) is the amount of work or energy generated when one kilowatt of power is supplied for a time of one hour. A kilowatthour is the unit of energy used by power companies when figuring your electric bill. Determine the number of joules of energy in one ...

the sum of the first four terms of a geometry series is 15 and the sum of the next 4 terms is 240.determine the positive constant ratio.

 "problems that result as blood alcohol concentration increases" Basically, I'm supposed to put what page number the answer is on, and then what the answer is. I have the page number, yet the answer is no where on the page to be found. I've read it over multiple times, so I'...

A piece of charcoal of mass 35g is found in the ruins of an ancient city. The sample shows a carbon14 activity or R(t)=4.167 decays/sec. Convert the decay constant of ^14C from (1)(a)in terms of seconds instead of yrs. Find the number of atoms N(t)using constant you found.

(1) Use the thermodynamic values to (a) deduce the enthalpy change of each reaction (b)state if the reaction is exothermic,or endothermic,and also how much energy is released or absorbed. For thi reactions; (1) NH4NO3 (s)>N2 (g) + 2H2O (l) (2) 4Zn (s) + 9HNO3 (aq...

A 890 mL NaCl solution is diluted to a volume of 1.15 and a concentration of 8.00 . What was the initial concentration? How do I go about this? M1V1=M2V2? and if it is how do I replace the variables?


Calculate the volume at which pH = pKa if 30.00mL of weak acid with a concentration of 0.0955M is titrated against a strong base with a concentration of 0.1233M.

A 30.75 mL sample of 0.450 MKOH was titration with an unknown concentration of HCl. The endpoint was reached when 29.35 mL of NaOH were delivered. Find the concentration of the titrant

A 1.90kg object is attached to a spring and placed on frictionless, horizontal surface. A horizontal force of 14.0 N is required to hold the object at rest when it is pulled 0.200 m from its equilibrium position (the origin of the x axis). The object is now released from rest...

Consider the following reaction occurring at 298K BaCO3(s)> BaO(s) + CO2 (g) show that the reaction is not spontaneous under standard condition by calculating delta G rxn. I calculated delta G and got 219.7 kJ, now the question asks if BaCO3 is placed in an evacuated flask...

A 95 gram piece of metal is heated to 98°C and placed into 200mL of water insulated at 20°C. If the equilibrium temperature is 27.20, find: The heat gained by the water. calories The specific heat of the metal. cal/(g°C) Hint: 1 mL water has a mass of 1 gram I have no idea ...

When you press the power button on your computer, it doesn’t turn on. There is nothing…silence…absolute zero. There are no beeps, no whistles, nothing. The monitor is getting power and the power strip is turned on. 1.Draw a diagram of the wiring scheme based on the ...

A standing wave is set up in a string of variable length and tension by a vibrator of variable frequency. Both ends of the string are fixed. When the vibrator has a frequency fA, in a string of length LA and under tension TA, nA antinodes are set up in the string. (a) Write an...

Hi, can you please check my work? I really need to do well on this. 1. What properties of a star are needed to calculate the stars luminosity? a. size and apparent brightness b.mass and distance to the star**** c. temperature and diameter of the star d. apparent brightness and...

A bullet of mass 0.06kg is fired horizontally with a muzzle speed of 700 m/s into a pendulums hanging block of mass 2.0kg. The block and the bullet then move up a height, h, above the pendulums equilibrium position. What is the speed of the bullet/block combination after the ...

A crowbar is 4.000 metres long and has its pivot 50.000 centimetres from one end. A force of 2000.000 newtons is applied to the end closest to the pivot. What effort must be applied to the other end of the crowbar to keep it in equilibrium? (Round to 3 decimal places)


These are the words in the word bank that you can use:hydrant,thermos,hydrophobia, thermostat,hydrogen,thermometer, hydraulic,thermal,dehydrated,diameter, hydroelectric,geometry,chronic, speedometer,chronicle,barometer, synchronize,centimeter,chronological, symmetry this is my...

In a 120 volt electrical circuit having a resistance of 16 ohms, the available power P in watts is a function of I, the amount of current flowing in amperes. If P(I)=120I16I^2, how many amperes will produce the maximum power in the circuit? What is the maximum power?

At 25 °C, the equilibrium partial pressures for the following reaction were found to be PA = 4.10 bar, PB = 5.60 bar, PC = 1.20 bar, and PD = 9.70 bar. 2A(g)+2B(g)>C(g)+ 3D(g) What is the standard change in Gibbs free energy of this reaction at 25 °C. I don't really get...

Propylene can be produced from the dehydrogenation of propane over a catalyst. At atmospheric pressure, what is the fraction of propane converted to propylene at 400, 500, and 600°C if equilibrium is reached at each temperature? Assume ideal behavior. (Temperature(C) 400 ka:0...

What number is equal to ã49

0<×<equal to 2

5% of a number is equal ti 25. Would this be 20 A.S.A.P.

if BaSo4 was precipitated in solution contain 0.012 M NaCl and 0.002 M BaCl2 .calculate the sulfate concentration which is sufficient for saturate the solution with BaSo4 , if you now that the Ksp for BaSo4 equal to 1*10^10 .

1 In the reaction of potassium permanganate and iron salt in acidic medium, how many moles of manganese reacted with iron? 2 moles of Mn with 1 mole of Fe 1 mole of Mn with 5 moles of Fe 1 mole of Mn reacts with 1 mole of Fe 5 moles of Mn reacts with 1 mole 2 Which of the ...

Angelique and Serena’s ages are in the ratio 5:3. Serena’s and Venus’ ages are in the ratio 6:5. If Angelique is 25 years older than Venus, calculate the average age of the three girls.


1.What is the molar heat of vaporization of water, given the following thermochemical equations? H2 + 1/2 O2 > H2O + 241.8 kJ H2 + 1/2 O2 > H2O + 285.5 kJ a) 44.0 kJ/mol b)44.0 kJ/mol c)241.8 kJ/mol 2. Which substance has a standard enthalpy of formation delta Hf, ...

This is probably a really easy question, but I just don't know how to set it up. An object in equilibrium has three forces exerted on it. A 33 N force acts at 90 degrees from the xaxis and a 44 N force acts at 60 degrees. What are the magnitude and direction of the third ...

A uniform rod pivoted at one end (point O) is free to swing in a vertical plane in a grav itational field, held in equilibrium by a force F at its other end. The rod of length 7 m and weight 4.7 N makes an angle 39◦ with the hor izontal and the force an angle of 54&#...

Consider the reaction: A(g)⇌2B(g) Find the equilibrium partial pressures of A and B for each of the different values of Kp. Assume that the initial partial pressure of B in each case is 1.0 atm and that the initial partial pressure of A is 0.0 atm. Make any appropriate ...

A sphere with a mass m and a net charge Q is tied to a string and placed in a uniform electric field E. Once the sphere has come to equilibrium, the string makes an angle theta. Find the charge Q in terms of E, m, and theta. I am not sure how to combine the force of tension ...

The ratio of cars to people in Australia is 350 to 1000. Write this ratio as a fraction in simplest form.

11/w=33/w+24 Basically it's made to look like a proporiton, ratio + ratio. And I know that 33w= 11(w+24) But I don't know what to do from there could somebody explain to me? Thank you!

The incomes of Aslam, Babar and Rafeeq are in the ratio 2:3:5. If the increments of 15%,10% and 20% are allowed respectively in their salaries, then what will be new ratio of their income?

In the population of a praticular country, the male to female ratio is 48 to 62. Write this ratio as a fraction in simplest form. A. 2/3 B. 1/4 C. 24/31 D. 31/24 Is the answer C?

(Please tell me if I did a good job!) Write an equation with a variable on both sides of the equal sign that has infinitely many solutions. Solve the equation and explain why it has an infinite number of solutions. (My answer:) 3x + 5 = 3x + 5 This equation is equal to its ...


Find the false statement(s) about the thermochemistry experiment in which nitric acid is reacted with sodium hydroxide, and the enthalpy of the reaction is measured using an ice calorimeter. i. Regardless of which strong acid and strong base are used for the neutralization ...

Any help is greatly appreciated 5mL of a solution A (unknown concentration) was transferred into sic 25mL volumetric flask. The following volumes of a standard solution of A with with a concentration 75ppm were added to the flask: 0mL, 0.5mL, 1mL, 1.5mL, 2mL, and 2.5L. The ...

What is the ratio in simplest form for 30 ounces:3 pints

An engine moves a motorboat through water at a constant velocity of 22 meters/second. If the force exerted by the motor on the boat is 5.75 × 103 newtons, what is the power of the motor?

An engine moves a motorboat through water at a constant velocity of 22 meters/second. If the force exerted by the motor on the boat is 5.75 × 103 newtons, what is the power of the motor?

A 5kg package is lifted vertically through 10m at constant speed. What is the potential energy of the package if acceleration due to gravity is 10m5 to power negative 2

A wirewound resistor with a resistance of250ohm Will overheat if the power dissipated exceeds 10W.What is the maximum constant voltage V that can be applied across the terminals of this resistor?

When an air capacitor with a capacitance of 300 nF (1 {\rm nF} = 10^{9}\;{\rm F}) is connected to a power supply, the energy stored in the capacitor is 1.95×10−5 J. While the capacitor is kept connected to the power supply, a slab of dielectric is inserted that ...

When an air capacitor with a capacitance of 380 nF (1 {\rm nF} = 10^{9}\;{\rm F}) is connected to a power supply, the energy stored in the capacitor is 1.95×10−5 J. While the capacitor is kept connected to the power supply, a slab of dielectric is inserted that ...

the lead (II) nitrate in 25.49 ml of a 0.1338M solution reacts with all of the aluminum sulfate in 25.00 ml solution. What is the molar concentration of the aluminum sulfate in the original aluminum sulfate solution? For a question like this how do I find out it is a 3:1 ratio...


g(x)= 8/109x would the correct answer be a) {xIx is a real number and x ==/== 10/9? b){xIxis a real number and x equals lesser or equal to >_ 10/9 c){xIx is a real number and x =/= 0 d){xIx is a real number and x =/= 8 my answer is c is this correct?

g(x)= 8/109x would the correct answer be a) {xIx is a real number and x ==/== 10/9? b){xIxis a real number and x equals lesser or equal to >_ 10/9 c){xIx is a real number and x =/= 0 d){xIx is a real number and x =/= 8 my answer is c is this correct?

Neon sign require about 12,000 V for their operation. What should be the ratio of the number of loops in the secondary to the number of loops in the primary for a neonsign transformer that operates off 120 V lines? Nprimary/Nsecondary= Primaryvoltage/secondaryvoltage solve ...

The ratio of children to adults in a room is 2:5.Amonst the adults,the ratio of men to women is 3:4.Find the ratio of children to men.

1 The golden age of culture came during which empire? A.Roman B.Persian C.Gupta D.Mauryan** 2. This raja conquered weak kingdoms left by alexander the great ? a) Chandragupta Maurya*** B) Asoka C) Hari Krishna D) Vishnu 3. In this section of the Mahabharata, Krisha talks about...

A Styrofoam bucket of negligible mass contains 1.75 kg of water and 0.450 kg of ice. More ice, from a refrigerator at 15.0 ∘C, is added to the mixture in the bucket, and when thermal equilibrium has been reached, the total mass of ice in the bucket is 0.884 kg. Assuming no ...

1.057 grams of a substance with a molar mass of 385.336 g/mol are dissolved in 249.92. Ther temperature for the system changes from 83.83 to 52.38 degrees C during the mixing. What is the DH(heat of solution) for this process in kJ/mol. Assume that th density of water is 1.00g...

Determine which ratio forms a proportion with 9/5 by finding a common multiplier? 54/30 45/50 45/40 90/20 Determine which ratio forms a proportion with 12/7 by using cross products? 60/35 24/10 36/14 18/14 Which ratio can from a proportion 20/25,14/21 10/23,18/7 5/45,4/36 5/4,4/5

For each of the following situations, indicate the direction of the shift in the supply curve or the demand curve for dollars, the factor causing the change, and the resulting movement of the equilibrium exchange rate for the dollar in terms of foreign currency: e. The ...

Q 1: which of the following conditions occur when an object is in static equilibrium ? (can be more than one option) a. net force on the object is zero b. net torque on the object is zero c. acceleration of the object is zero d. velocity of the object is zero Q2: Student A ...


A lobsterman's buoy is a solid wooden cylinder of radius r and mass M. It is weighted on one end so that it floats upright in calm sea water, having density . A passing shark tugs on the slack rope mooring the buoy to a lobster trap, pulling the buoy downward a distance x from...

After 6.00 kg of water at 77.3 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...

What is the concentration of H+ ions in a buffer solution containing 0.305 M benzoic acid (with ionization constant 6.5 × 10−5)and 0.834 M sodium benzoate (a salt of benzoic acid)?

If a consumer is in equilibrium and all prices and her income increase by 25%, she will consume less of those goods that she considers inferior. if false, explain why. Take a shot. What does your economic reasoning tell you? Hint. If all prices and income rise by exactly 25%, ...

A is a solution of trioxonitrate (v)acid, HNO3 of unknown concentration.B is standard solution of sodium hydroxide containing 4.00g per dm3 of solution. 25 cm3 portion solution B required an average of 24.00cm3 of solution A for neutralization using 2drops of methyl orange 1 ...

A machine prints out the number 1, 2, or 3 with equal probabilities. A machine starts printing numbers independently one after another and stops the rst time it prints 1. Let X denote the number of 2s it printed. Compute E[X] and var(X).

Can you check these? 1. Olivia typed 2 pages in 15 minutes. Write an equation relating the number of minutes m to the number of pages typed. How long will it take her to type 10 pages at this rate? Ans: 15/2 = 7.5 = 7.5 * 10 = 75 minutes 2. If the ratio of Type O to nonType O...

If a weak acid is say only 5% ionized at equilibrium, then the ionization rxn would be reactant favored, correct? I am a little on the fence about understanding this if anyone could better explain why this would be? I am assuming because it is not completely ionized, the ...

A 3.90×10^2kg cube of ice at an initial temperature of 18.0degreesC is placed in 0.480kg of water at 41.0degreesC in an insulated container of negligible mass. Calculate the change in entropy of the system. I found the equilibrium temperature to be at 304.9K, then used ...

The mass of a car is 2400 kg. the constant power supplied by the engine is 60 kW and the car starts from rest. What is the speed of the car at the end of 2 seconds?


The motor for an elevator can produce 2200 W of power. The elevator has a mass of 1100 kg complete with contents . At what constant speed will the elevator rise ?

Do 65 grams of oxygen and 44 grams of carbon contain equal number of atoms? Calculate the number of atoms?

a/b + b/a = x a/b  b/a = y in the equation above, if a is (not equal) to 0 and b is (not equal) to 0, which of the following must be equal to x^2y^2? a. 2 b. 4 c. ab/2 d. a^2 b^2/2 e. 4a^2b^2

a/b + b/a = x a/b  b/a = y in the equation above, if a is (not equal) to 0 and b is (not equal) to 0, which of the following must be equal to x^2y^2? a. 2 b. 4 c. ab/2 d. a^2 b^2/2 e. 4a^2b^2

Given that a:b = 8:5 and b:c= 3:4 find the ratio a:b:c Give your answer in its simplest form. Show all working out. My work: 1) 5 and 3 both equal to b. 2) 8+5=13/2= 11.5 3)3+4=7/2=3.5 4)11.5+3.5= 15 All my working shown I dont understand this question please help!

Suppose 0.0210 kg of steam (at 100.00°C) is added to 0.210 kg of water (initially at 19.5°C.). The water is inside a copper cup of mass 48.9 g. The cup is inside a perfectly insulated calorimetry container that prevents heat flow with the outside environment. Find the final ...

Suppose 0.0210 kg of steam (at 100.00°C) is added to 0.210 kg of water (initially at 19.5°C.). The water is inside a copper cup of mass 48.9 g. The cup is inside a perfectly insulated calorimetry container that prevents heat flow with the outside environment. Find the final ...

Suppose 0.0210 kg of steam (at 100.00°C) is added to 0.210 kg of water (initially at 19.5°C.). The water is inside a copper cup of mass 48.9 g. The cup is inside a perfectly insulated calorimetry container that prevents heat flow with the outside environment. Find the final ...

A number less 7 is greater than 45. How can the solutions for this inequality be described? Is 40 a solution? A) All numbers less than 38.; yes B) All numbers greater than 38.; no C) All numbers less than or equal to 38.; yes D) All numbers greater than or equal to 38.; ...

A mathematical model for concentration of administered cortisone in humans over a 24hour period uses the function C= [(D x a) / V(ab)] (e^(bt)e^(at) where C is the concentration, D is the dose given at time t=0, V is the volume of distribution (volume divided by ...


Determine the power dissipated in each of the resistors and the power entering the source. Express your powers in Watts. Remember that the power entering a twoterminal device is the product of the voltage across the device and the current through it in the associated ...

The ratio of the number of girls to the number of boys in a sports club is 3:6. There are 15 more boys than girls in the club. How many pupils are in the club altogether?

What weights of NaH2PO4 and NaHPO4 would be required to prepare a buffer solution of pH 7.45 that has an ionic strength of 0.1? pKa2=7.12 , mwt NaH2Po4=120g/mol NaHPO4=142 g/mol using the hendersonhasselbalch equation i got that the ratio of the concentration of NaH2PO4 to ...

Scenario: Regression equations are created by modeling data, such as the following: Sales = (Cost Per Item × Number of Items) – Constant Charges In this equation, constant charges may be rent, salaries, or other fixed costs. This includes anything that you have to pay for ...

magine you look through a really strong telescope and see a rich cluster. Your telescope is so good that you can see a single galaxy at the center of the cluster. What can you say about that galaxy and be pretty confident that you are correct? It has mass smaller than that of ...

0.5x + 7 less than or equal to 1.3x8 .5xless than or equal to 1.3x15 .8xless than or equal to 15 x less than or equal to18.75 Is this correct?

A Styrofoam bucket of negligible mass contains 1.60 kg of water and 0.425 kg of ice. More ice, from a refrigerator at 14.8 degree C, is added to the mixture in the bucket, and when thermal equilibrium has been reached, the total mass of ice in the bucket is 0.768 kg. Assuming...

A Styrofoam bucket of negligible mass contains 1.60 kg of water and 0.425 kg of ice. More ice, from a refrigerator at 14.8 degree C, is added to the mixture in the bucket, and when thermal equilibrium has been reached, the total mass of ice in the bucket is 0.768 kg. Assuming...

Five hockey pucks are sliding across frictionless ice. The drawing shows a top view of the pucks and the three forces that act on each one. The forces can have different magnitudes (F, 2F, or 3F), and can be applied at different points on the puck. Only one of the five pucks ...

A Styrofoam bucket of negligible mass contains 1.75 kg of water and 0.450 kg of ice. More ice, from a refrigerator at 15.0∘C, is added to the mixture in the bucket, and when thermal equilibrium has been reached, the total mass of ice in the bucket is 0.884 kg. Assuming ...


540 kg of dry concrete mixture is to be spread over three surfaces in the ratio equal to that of their areas.If their areas are 9 square m,11 square m and 16 square m,how much is used on each surface?

question: write the expression for a number used as a factor seventeen times being multiplied by the same number used as a factor fourteen times.then write the product as one power?

Write the expression for a number used as a factor fifteen times being multiplied by the same number used as a factor ten times. Then, write the product as one power. Thanks, Michaela

Write the expression for a number used as a factor fifteen times being multiplied by the same number used as a factor ten times. Then, write the product as one power. Thanks, Michaela

Did I do this correctly? 13  (2c + 2) >(pretend it has the line under it that means greater than or equal to) 2(c + 2) + 3c 13 2c 2 (greater than or equal to) 5c + 4 11c (greater than or equal to) 7c + 4 7c to both sides 4c (greater than or equal to) 4 divide both sides...
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