Questions Asked on
July 20, 2016

Chemistry
For two questions below, first write and balance the equation for the chemical reaction. Please, also review the material in Chapter 8, if you will feel you might need it in order to answer the questions. Next, please answer the following questions:
asked by Chem&Society 
Physics
In each cycle of its operation, a heat engine expels 2400 J of energy and performs 1800 J of mechanical work. (a) How much thermal energy must be added to the engine in each cycle? (b) Find the thermal efficiency of the engine.
asked by Theaaaa03 
Chemistry
The atmosphere contains about 5.2 x1015 t of air. What mass in metric tons of carbon dioxide is in the atmosphere if the concentration of CO2 is 395 ppm?
asked by Chem&Society 
Chemistry
Express each aqueous concentration in the unit indicated. 45 ppm NO3 , as molarity of nitrate ion in [mol NO3  /L].
asked by Chem&Society 
Physics
Two lead spheres at the same temperature have radii in the ratio 1:2.what is the ratio of their heat capacities
asked by Vaishnavi 
Physics
Your ear is capable of differentiating sounds that arrive at the ear just 1.00 ms apart. What is the minimum distance between two speakers that produce sounds that arrive at noticeably different times on a day when the speed of sound is 340 m/s?
asked by Elizabeth 
Chemistry
How many grams of hydrogen peroxide (H2O2) must be added to 1,500 ml of water to produce a concentration of 1.33 m (molal solution)?
asked by Damon 
Chemistry
The human body obtains 885 kJ of energy from a chocolate chip cookie. If this energy were used to vaporize at 100 degree Celsius, how many grams of water could be vaporized? The heat of vaporization of water at 100 degrees Celsius is 40.7 kJ/mole.
asked by Jane 
Math
A number sentence is 50 1/2 ÷1/4 =202. Part A. Create a story or context for this number sentence. Part B. Rewrite this number sentence using multiplication. Part C. Give a verbal explanation that describes how these three numbers are related.
asked by Anonymous 
Calc
the productivity of a person at work is modeled by a cosine function: 5cos (pie/2 (t)) +5, where t is in hours. If the person starts work at t=0, being 8:00 am, at what times is the worker the least productive?
asked by Anonymous 
Chemistry
For the system, H2(g) + X2(g) 2HX(g), Kc = 24.4 at 300 K. A system was charged with 2.00 moles of HX in a 3.00 liter container. The catalyst was introduced using a remote unit, and the system was allowed to come to equilibrium. How many moles of H2(g) will
asked by Val 
Math
Clark has 7 1/2 feet of wire. Part A. How many 3/4 foot pieces can Clark cut from the 7 1/2 feet of wire? Part B. Using the information in Part A, interpret the meaning of the quotient in terms of the two fractions given.
asked by Anonymous 
chemistry
Assuming all gases are at the same temperature and pressure, how many milliliters of hydrogen gas must react to give 41.0 mL of NH3? 3H2(g)+N2(g)→2NH3(g)
asked by Maria 
math
The angles of elevation of a balloon directly above a straight road, from two points of the ground on opposite sides of the balloon, are 78¡ã15' and 59¡ã47'. If the points are 5000ft apart, what is the height of the balloon?
asked by james 
Chemistry
For the teaction system, 2SO2(g) + O2(g) 2SO3(g), Kc has a value of 4.62 at 450.0K. A system, at equilibrium, has the following concentrations: [SO3] = 0.254 M, [O2] = .00855 M. What is the equilibrium concentration of SO2(g)? The correct answer is 1.28M,
asked by Mikey 
Microsoft excell
A rectangular range of cells with headings to describe the cells' contents is referred to as a A. table. B. complex formula. C. bar chart. D. sparkline. My answer is a.
asked by Daniela 
Physics
Two resistors of 2.0 ohm and 3.0 ohm are connected a) in series b) in parallel, with a battery of 6.0V and negligible internal resistance. For each case draw a circuit diagram and calculate the current through the battery
asked by Bella 
Algebra
A certain recipe requires 2 3/5 cups of flour, and 3 1/4 cups of sugar. a) if 3/8 of the recipe is to be made how much sugar is needed? b) if the above ingredients are required for one batch, find the amount of flour needed for a triple batch.
asked by Christine C 
Math
A mortgage of 200 000 is required to purchase a house. The mortgage will be repaid with equal monthly payments over 25 years at 10% compounded monthly. what is the monthly payment
asked by Jennfier kosner 
statistics
find the number of units that must be produced to break even. R(x)=200x  x^2 C(x)= 70x +2200 0 < x < 100 (These < are supposed to b less than or equal to signs)
asked by Anonymous 
Math
What is the pH of buffer solution prepared with 0.05 M ammonia & 0.05 M ammonium chloride? The Kb value of ammonia is 1.80 ✖️ 10^5 at 25C.
asked by Neth 
geography
examine the sphere of influence of an organisation that renders a service in your are. e.g. clinic, hospital, a local high school?
asked by josephinah 
Physics
A second's pendulum is taken on the surface of moon where acceleration due to gravity is 1/6th of that of earth.Will the time period of pendulum remain same or increase or decrease?Give a reason.
asked by Yashasvi 
science
When a body hanging form a spring balance is immersed in water it floats just below the surface of water and shows 100 g loss in its water ? (1) what is the weight of the body in water? (2) what is the weight of the body in air? (3) what is the upthrust on
asked by parag 
GPH 111
On a map with a scale of 1:12,000, a measured distance of 1 inch represents what distance in feet? With work
asked by Bethany 
mathematics
what is the probability that today is tuesday and tomorrow is wednesday
asked by Anonymous 
Math  Trig
The equation given below models the average monthly temperature (˚C). t denotes the number of months with t=1 representing January. During which months is the average monthly temperature 12.5˚C? 𝑇(𝑡) = 12.5 + 15.8sin (𝜋/6 (𝑡) −2𝜋/3)
asked by Anonymous 
Physics
ABC is an equilateral triangle of side 4.0 cm in a vacuum. There are point charges of 8.0C at A and B. Find (a) the potential, (b) the electric field at C.
asked by Hezekiah 
Math
Part b using the information in part a , interpret the meaning of the quotient in terms of the two fractions given
asked by Angela 
Math
There are 45 students in a class of which 3/5of them are boys.how many girls ate there in the class?
asked by Nad 
Math
The dimensions of a rectangular prism are Length 2/14 feet width 1 foot Height 1 1/4 feet. The length of the sides of a small cube are 1/4 foot each. Part A. How many small cubes can be packed in the rectangular prism? Part B. Use the answer obtained in
asked by Anonymous 
math
the product of three numbers is 315.if two of the numbers are 7 and 9 .what is the third number?
asked by joshua 
math
Given that 0 ≤ 𝑥 ≤ 𝜋/2and 0 ≤ 𝑦 ≤𝜋/2 find the exact value of 𝑡𝑎𝑛(𝑥 + 𝑦) if 𝑐𝑜𝑡(𝑥) =6/5 and 𝑠𝑒𝑐(𝑦) =3/2
asked by Stacy 
Calc
a large closed storage rectangular box with a base constructed with two different types of wood. the base is made up of wood $5 per square feet and the top and sides are made of wood $3 per square feet suppose the amount available to spend is $1000 find
asked by James 
Math
In a group of 500 students, 150 are studying physics, 220 are studying biology, and 100 are studying chemistry. At least 25 students are studying more than one of these sciences. What is the greatest possible number of these students that might NOT be
asked by Anonymous 
valuemath
muli's farm had sheep and goats in the ratio 3:4 respectively, cows and goats in the ratio respectively.if he had 20 goats,how many animals did he have altogether?
asked by valueEric 
chemistry
The compete oxidation of 2g of an aldehyde A by acidified potassium chromate produces 2.1g of carboxylic acid B which is dissolved in 50 ml of distilled water . The obtained solution reacts with exactly 1.05 g of solid lime to form salt C a) Write the
asked by dani 
Math
How many small cubes can be packed in the rectangular prism
asked by Karuun 
Math
if sec(x) =  squaroot 20 /3 (squroot applies to 20 not the fraction) then state the exact vale of tan (x)
asked by Anonymous 
physics
An infinitelylong wire with resistivity 2.0*10^8 ohm*m initially has 1.5 A of "conduction" current flowing through it. When the emf connected to the wire is turned off, this current stops in time of .6ns. Estimate the amount of displacement current
asked by Sally 
physics
Solar material has a density of about 3*10^4kg/m^3,and the amount of matter released in a typical CME is around 1*10^15kg. Assuming mu solar material is mu_0, estimate the strength of the magnetic field at the suns surface during typical CME
asked by unknown 
math
the sum of three consecutive numbers is eighteen. Write an expression describing the equation and solve the state of the three numbers
asked by Erica 
Math
For what value(s) of r is r^2+5r+6/r+2 equal to 0? A) 2 only B) 3 only C) 3 only D)2 or 3 E) 2 or 3 I got A but it is incorrect and I'm still confused Thanks
asked by Damon 
English
What is the simple subject of the following sentence? Several sites on the internet give information about extreme sports. I believe the simple subject is: sites
asked by Blake 
Math  Trig
A hamster enters a wheel at the lowest point and begins to run . The height of point R (in the diagram below) above the ground is given by the function ℎ(𝑡) = −17.5 cos ( 2pi/3 𝑡) + 19, where ℎ is height in centimeters and 𝑡 is time in
asked by Anonymous 
Physics
The answer "use the righthand rule" isn't working for my brain. I'd really like to understand how to answer the following: You can make an electromagnet by wrapping wire around a wire and connecting the ends to a battery. If the battery is connected so
asked by Anna 
college physics
Suppose an aeroplane is moving in the north direction and magnetic field is into the paper .Which part of aeroplane will b positively charged? Aits head Bits left wing Cits tail D its right wing
asked by Ghulam 
math
show that abc is a right angled isosceles triangle prove that AD>AC and AC>CD also arrange in ascending order
asked by dcs 
math
The area of a variable rectangle is increasing at the rate of 40cm/s. The length of a rectangle is always equal ti the square of the breadth. At what rate the length is increasing at the instant when the breadth is 8cm?
asked by bengia lucy 
maths
a cyclist cycles for 2h at a speed of 27km/h. he then cycles for 11/2h at an average speed of 20km/have. fin the average speed for the whole journey.
asked by manasi rycha 
math
the sum of three consecutive numbers is eighteen. Write an expression describing the equation and solve the state of the three numbers
asked by Erica 
physics
what is pin hole cemera
asked by musa ezekiel 
maths
A rectangular garden is to be constructed using 100 metres of fencing but using a straight wall as one side.the rectangle is x metres. Find the lenght of the garden in terms if x?
asked by Bryan 
Algebra
C the power of two+18c175=0 Help please?
asked by Ben 
Math
The tornadoes have won 75% of their games. If they their next 4 games, their win percentage goes up to 80%. How many games have they played right now? (Please explain how to solve this problem)
asked by Selina 
Math
If given the graph of 𝑓(𝑥) = − sin (3x + 𝜋/3 ) − 2 describe the steps you would take to draw the graph of the reciprocal function
asked by Anonymous 
Math
On each of four cards, a different positive integer greater than 1 but less than 20 is written. Exactly 3 of the numbers are multiples of 3, exactly two of the numbers are multiples of 5, and none of the numbers is even. What is the sum of these four
asked by Lenin 
Math
At a certain store, employees may buy clothing at a 20% discount from the original price, but must pay a 6% sales tax. If the final cost of a sweater purchased by an employee is $55.12 what is the original price of the sweater, before the discount and tax?
asked by Anonymous 
Chemistry
How many liters of HCl acid needed to dissolve at 1 ton of carbon and how long would it take?
asked by Derrick 
Physics
A paper ball is dropped from a height of 5 meters above the ground. It hits the ground traveling with a speed of 2 m/s. How much work did air resistance do on the paper ball? I don't know how to start this. PLease help
asked by Jay 
physics
a car moving through road what is the direction of force and surface of acting
asked by Anonymous 
physical science
which sibstance has the least number of drops that can fit on the coin?
asked by ikhandlela 
science
According to chance what fraction of their children will have dimples?
asked by Haziq Mehboob 
Math
Roots. Solve and check 1/4 1/x+6= 1/x
asked by Cazi melar 
SCIENCE
WHAT CAN BE THE ARRANGEMENTS OF PARTICLES IN MERCURY
asked by SHAFAQ 
Math
How far will a 4ft diameter wheel travel while making 100 revolution?
asked by Paul 
math
if the ratio of interior angle of triangle are 4:11:3.Find the greater angle.* i am confused about the word greater does the question need the angle with 11 ratio or 4 ratio?
asked by kelvin 
physics
A particle is moving along a circular path of radius r, when it makes half a rotation, what is the ratio between its displacement and distance? (a) 2π (b) π (c) π/2 (d) π/4
asked by SAGAR 
math
ther 840 people in mrs mitchells class and 453 people in mrs coles class i want to know how many people all are toghether
asked by melshia griffin 
statistics
What is straight line depreciation for an item that costs $15,951. whose life is 13 years?
asked by Anonymous 
Geometry
Describe the translation. y=(x−5)2+5 → y=(x−0)2+0
asked by BigCherry123 
Geometry
Describe the translation. y=(x−5)2+5 → y=(x−0)2+0
asked by BigCherry123