Tuesday

July 26, 2016
Total # Posts: 98,429

**physics**

work done against gravity = 50*9.81 *20 total work done, add 200 J to above efficiency = 100 * work against gravity/total work I do not know tension in line because I do not know how your five blocks are arranged.
*June 25, 2016*

**physics**

v = total v - watr v vx = 3 - -3 = 6 vy = 4 - -4 = 8 so 6 i + 8 j
*June 25, 2016*

**Physics **

What is net capacitance if maximum potential is 40 volt and instant charge is 60 coulomb.?
*June 25, 2016*

**algebra**

Ryan throws a tennis ball straight up into the air. The ball reaches its maximum height at 2 seconds. The approximate height of the ball x seconds after being thrown is shown in the table. Which equation models the motion of the ball?
*June 24, 2016*

**math**

Your car gets 21 miles to the gallon and your friends car gets 28 miles to the gallon? you decide to go on a road trip to UVA, which is 175 miles away. if gas costs $4 per gallon and you decide to split the gas money, how much money will each of you save in gas by driving your...
*June 24, 2016*

**math**

is it 1.0038x10^2
*June 24, 2016*

**math**

a 1 million sq mile d\forest is how many hectares?
*June 24, 2016*

**math**

how much would $500 invested at 4% interest compounded continuously be worth after 7 years? Round your answer to the nearest cent. Do not include units in the answer.
*June 24, 2016*

**math**

Dimensional Analysis 8.9x10^5 tons=_____ kg i need to show my work but I don't understand where to start.
*June 24, 2016*

**math**

3.7x10^3 x 2.9x10^2 =1.073x10^4
*June 24, 2016*

**math**

0.0012x10^-13 - 1.5x10^-10 is it 1.2x10^-9
*June 24, 2016*

**math**

3.7x10^13 - 2.9x10^11 so we change it to .29x10^12 but what else do u do so exponents are the same?
*June 24, 2016*

**math**

4.67x10^4 + 323x10^3 = 4.993x10^4
*June 24, 2016*

**math**

26.3 x 10^3 + 4x10^3 = 26.3+4= =30.3x10^3
*June 24, 2016*

**Math**

How much milliliters must be added to 40 ml of a 10% acid solution to reduce its concentration to 4%?
*June 24, 2016*

**Math**

How much water in mL must be added to 40mL of a 10% acid solution to reduce its concentration to 4%?
*June 24, 2016*

**Physics **

On a day that is 30°c, you drop a rock from the top of a well. You hear the sound of the rock hitting the bottom 0.6s after you drop it. How deep is the well?
*June 23, 2016*

**Language **

Which words can be used to describe Jonas's father
*June 23, 2016*

**matyh**

80% of your employees work in production. What fraction of the employees work in production?
*June 23, 2016*

**Math**

Greates number can be rounded to 6000
*June 23, 2016*

**Chemistry**

I got ba-137 ti-48 si-28 and o-16. Now to get mol mass I understand I need to add these up but am I suppose to be multiplying o by 9 and si by 3 based on the formula for mol mass or just o times 3 and si by 3 after?
*June 23, 2016*

**Chemistry**

I'm having a hard time setting it up to figure out the answer
*June 23, 2016*

**Chemistry**

In 1985 benitoite became the California “state gemstone.” Found only in a tiny mine near Coalinga, California, it is a silicate of barium and titanium with trace impurities that cause a range of hues from colorless to blue to pink. Its general formula is BaTi(SiO3)3...
*June 23, 2016*

**Calculus**

Related rates: The volume of a cube is increasing at the rate of 40 mm^3/s. How fast is the surface area of the cube increasing when each edge is 10 mm?
*June 23, 2016*

**Algebra **

I deposit 2,500.00for 7months and make 19.76in interest. What. Rate of interest an i receiving?
*June 23, 2016*

**Chemistry**

The amount of energy released by the combustiom of 100 g of C2H2 (g) is ______ MJ. 2CH2 + 5O2 ----> 4CO2(g) + 2H2O(g) ΔH= -2511.0 kJ Do I use ΔH = Hproducts - Hreactants? And if so how would that help me solve for the energy released?
*June 22, 2016*

**Science**

you are correct
*June 22, 2016*

**math**

Kyle buys last year's best-selling novel, in hardcover, for $19.50. This is with a 25% discount from the original price. What was the original price of the novel?
*June 22, 2016*

**math**

Sales at a certain department store follow the model 4072-01-02-03-00_files/i0100000.jpg where y is the total sales in thousands of dollars and x is the number of years after 2001. What was the first year that sales fell below $50,000?
*June 22, 2016*

**Math**

100X100X100,bases 2 and 5
*June 22, 2016*

**maths**

I am a 7 digit number My tens place is 3 My lakhs place is 2 My hundreds place is twice the lakhs place My thousands place is thrice the tens place My ten lakhs place is 3 less than the thousands place My ones place is 2 less than the thousands place My tens thousands place is...
*June 22, 2016*

**chemestry**

please,sir,If you give me the answers briefly means with oxidation state and half reaction,I will be grateful to you.Because i am suffering so much to find out oxidation state of Cr2S3 and half reaction.
*June 22, 2016*

**chemestry**

PLEASE,COULD ANYONE HELP ME to balance this redox reaction : Cr2S3 PbO2 + H2SO4 + -------> PbSO4 H2Cr2O7+H20
*June 22, 2016*

**economics**

please the quesionis heavy to me can u give the hint?
*June 22, 2016*

**physics**

A car accelerates from rest for ten seconds with a linearly increasing speed of 3 m/s every second. If the diameter of the tires is 2/3 m and they roll without slipping, find their final angular velocity in radians per second.
*June 21, 2016*

**maths**

See: Google "division by zero", then look at the "Math is Fun" entry for the subject.
*June 21, 2016*

**maths**

Division by zero is "undefined". In other words, the answer is neither.
*June 21, 2016*

**math**

On Tuesday and Wednesday, cab fare cost $7.75 total. On Monday and Thursday, cab fare cost $6.30 on each day. On Friday, cab fare cost $7.00. What was the average daily cost
*June 21, 2016*

**Math/Conversions**

I'm sorry if this is a ridiculous question, but how would I figure out how many L she consumed? Yes, Steve. I did read it wrong.
*June 21, 2016*

**Math/Conversions**

Good afternoon, could someone please help me with this? The answer is 22 1/2 oz. Doctor instructs pt to drink 1 L (33 4/5oz) of water. An hour later you find 1/3 L left. How many ounces did Ms. White consume? This is what I keep getting. I think I may be doing the wrong ...
*June 21, 2016*

**science **

The occurrence of earthquakes along plate boundaries indicates that the 1) plates are stationary 2) earth will eventually break apart 3) earth is shrinking 4) coast of California will break off and slide into the ocean 5) plates are moving
*June 21, 2016*

**Math**

The 3 digit number in which the ones digit is three times the tens digit and the tens digit is three times the hundred digit.
*June 21, 2016*

**Maths**

The area at the bottom of the pool floor is 20 meters squared and the pool is 1.5 meters deep. The hose is filling up the pool at a rate of 50 Liters per minute. How long will it take to fill the pool?
*June 21, 2016*

**maths**

BD is the bisector of angle ABC . prove that the perpendicular distances from BD to AB and CB are equal.
*June 20, 2016*

**Math**

8÷100×22=1.76 Monthly payment =22-1.76=20.24 so therefore he pay 20.24 in the fund every month. In every year =20.24×12=240
*June 20, 2016*

**Math**

Workers in a certain company are required to 8% of their salary into a social security fund.Mr Doe has a monthly sarary of GH¢22.00 How much does he pay into the fund every month? And every year?
*June 20, 2016*

**Math**

(6×10)-(3×3) 60-9=51 so, the part of the compound that is uncovered by the carpet is 51 square meters.
*June 20, 2016*

**Math**

(6*10)-(3*3)=60-9=51 51 square
*June 20, 2016*

**Math **

A rectangular compound has the dimensions 6m by 10m A square carpet is laid in the centre of the compound. the carpet is 3m by 3m. Find the part of the compound that is uncovered by the carpet.
*June 20, 2016*

**Calculus**

The position, p(t), of an object at time t is given. Find the instantaneous velocity at the indicated time c. Also determine whether it is moving forward, backward, or neither at time c. p(t)=2-1/t at c=3
*June 20, 2016*

**Introduction to Computers**

what of the following is a proper use of the application netstumbler?
*June 20, 2016*

**physics**

A body is moving with uniform acceleration of 10m per second square.lf it start from rest calculate its displacement afrer 5s
*June 20, 2016*

**math**

The gestation period of humans(266 days) is_________ percent longer than the gestation period of grizzly bears (220 days).
*June 19, 2016*

**chemestry**

i don't know how to solve this problem,could anyone is here to give me the correct solution.It will be good for me. In a reactor of 1.5 L the same amount of C and H2O was introduced. When the reaction: C(s) + H2O ⇄ CO + H2 reaches the equilibrium at 1273 K, the ...
*June 19, 2016*

**chemestry**

At 100 °C the reaction: SO2Cl2(g) ⇄ SO2(g) + Cl2(g) has Kp = 2.4. Calculate the equilibrium composition of the mixture when 1.2 atm of SO2Cl2 are mixed with 0.8 atm of Cl2 at 100 °C.
*June 19, 2016*

**chemestry**

Calculate the pH of a solution obtained dissolving 10 g of NH3 and 15 g of NH4Cl in 300 ml of water (Kb NH3 = 1.8 x10-5).
*June 19, 2016*

**Physical Science**

The A note has a frequency of 880 Hz. What is the wavelength if the speed of sound is 343 m/s? 0.39 m 2.57 m 537 m 301,000 m Which speed(s) is/are below the sound barrier in air? A. 257 m/s B. 1,030 m/s C. 10 m/s
*June 19, 2016*

**Maths**

A cliff on the bank of a river is 250m high if the angle of depression of the point of the opposite side of the river is 50 degree,find the width of the river
*June 19, 2016*

**chemestry**

1. Determine the pH of a solution containing 1.00 mol/L of HCN (Ka = 5.00×10–10) and 5.00×10–2 mol/L of HCl.
*June 19, 2016*

**Math**

For the function f(x)=sinx, show with the formula sin^2A=1/2(1-cos2A) that f(x+y)-f(x)=cosxsiny-2sinxsin^2(1/2y)
*June 19, 2016*

**Marketing**

1. What forces in the marketing environment represent possible opportunities for Danone's Activia brand? What forces represent potential threats to the Activia brand? 2. How might a customer assess the value of activia yogurt? Be as specific as possible in your answer.
*June 19, 2016*

**physics**

the length of an aluminium bar of length 80cm increases by 1mm on heating.what is the final temperature of the bar if it was initially at temperature 20 degree celsius?(given:coefficient of linear expansion of aluminium=25×10^-6
*June 19, 2016*

**chemestry**

Please could anyone help me to give me solution of this problem: Calculate the pH of a solution obtained by mixing 50 mL of NH3 0.1 M (Kb = 1.8•10–5 mol/L) and 25 mL of HCl 0.2 M
*June 19, 2016*

**physic mechanic**

that means dv/dt = F/m - (b/m)v or (b/m) v + dv/dt = F/m let v = c (1-e^-kt) then dv/dt = cke^-kt and (b/m)c -(b/m)ce^-kt +cke^-kt = F/m when t --> oo, F = bc so c = F/b when t = 0, c k = F/m so Fk/b =F/m so k = b/m now v = (F/b)( 1-e^-(bt/m) ) a = dv/dt = (F/b)(b/m)e^-(bt/...
*June 19, 2016*

**physic mechanic**

F - bv = m a a = (F-bv)/m
*June 19, 2016*

**chemestry**

calculate the concentration of acetic acid in a 0.85 m sodium acetate solution,when ph=7,knowing that for the acetic acid,ka= 1.76 x 10-6.
*June 19, 2016*

**English**

Choose the correct form of the possessive for the underlined word in the following sentence: “A YEARS worth of hard work has finally paid off.” ( "years" is underlined) should it be: year years years' year's
*June 18, 2016*

**history**

The idea of the Mandate of Heaven was: A. introduced in the Bhaghavadgita. B. borrowed from Tibetan nomads in the fifth century B.C.E. C. introduced by the Zhou dynasty and it served to legitimize its power. D. contained in the Rites of Mao.
*June 18, 2016*

**geometry**

find the shaded area. round to the nearest tenth if necessary 15cm 21cm 12cm 27cm
*June 18, 2016*

**geometry **

find the shaded area. round to the nearest tenth if necessary 15cm 21cm 12cm 27cm
*June 18, 2016*

**science**

a particle is projected vertically upward from ground with velocity 10 m/s. Find which time particle reaches highest point?
*June 18, 2016*

**Math**

Janet bought 7 paperweights and altogether it weighed 1.4 so how much do one weigh
*June 18, 2016*

**Mathematics construction**

Construct triangle xyz such that x=z=45degree and xz=8cm
*June 18, 2016*

**Science physics**

Ddps
*June 18, 2016*

**Physics**

A period pulse travel a distance at 20m in 1•00sec,if it's frequency is 2•0×10.calculate the wave length
*June 18, 2016*

**Science**

ddps kaun se section m
*June 18, 2016*

**physical science**

An 85.0 kg man playing hockey catches a puck moving at 25.0 m/s. The man is initially at rest. The man and the puck move together after the collision. The puck's mass is 0.16 kg. What is the final velocity? A. 4.00 m/s B. 1.00 m/s C. 13.6 m/s D. 0.05 m/s
*June 17, 2016*

**science**

one ballon is in the freezer and other is at room temprature wht is the size of baloon in freezer
*June 17, 2016*

**statistics**

. What is inferred by the 95% confidence interval of the mean?
*June 17, 2016*

**math models**

A force of 19 newtons is applied on a cart of 2 kilograms, and it experiences a frictional force of 1.7 newtons. What is the acceleration of the cart
*June 17, 2016*

**Scienca**

A bullet leaves a rifle with a muzzle velocity of 521 m/s .while accelerating through the barrel of the rifle , the bullet moves a distance of 0.840m.determine the acceleration if the bullet. (Assume a uniform acceletlration).
*June 17, 2016*

**physics**

plz solved kre
*June 17, 2016*

**Calculus (check?)**

I got 7/5
*June 17, 2016*

**Calculus**

lim x-->0 ((7-3x^5+x^2sinx)/(5cosx))
*June 17, 2016*

**calculus (check please?)**

i have a=-2 and b=1
*June 17, 2016*

**calculus**

find the constants a and b so the function is continuous on a real line piecewise function: f(x)={5, if x<= -2; ax+b, if -2<x<3; -5, if x>=3 I know the limit x-->2- is 5 and limit x-->3+ is -5. I dont know how to find the constants
*June 17, 2016*

**math**

The schematic of a rectangular patio is drawn 1/8 inch to a 1 foot. If the patio is 15 feet long, what is the measure of the patio's length on the schematic?
*June 17, 2016*

**chemistry**

what is the mole of a solution that has 6 mole of Ca-Cl 2 in 3 kg of water?
*June 16, 2016*

**geometry**

The ratio of similarity of BOY to GRL is 1:2. If BOY x 3 and GR 3 x 1, then the length of GR is
*June 16, 2016*

**math**

One pump fills a tank two times as fast as another pump. If the pumps work together they fill the tank in 18 minutes. How long does it take each pump working alone to fill the tank? mat
*June 16, 2016*

**physics**

Find the total heat capacity of a 2.0 mol diamtomic ideal gas at constant pressure if the molecules can rotate and vibrate.
*June 16, 2016*

**Physics**

One method of estimating the temperature at the center of the sun is based on the Ideal Gas Law. Assume the center consists of gases whose average M = 0.70 kg/kmol, density= 91000 kg/m3 and pressure = 1.39 x1011 atm. Calculate the temperature (in kelvins) at the center of the ...
*June 16, 2016*

**physics**

A one mole sample of an ideal monatomic gas at 400 K undergoes an isovolumetric process acquring 550 J of energy by heat. Next it undergoes an isobaric process during which is loses the same amount of energy by heat. Find the work done on the gas. Assume three degrees of freedom.
*June 16, 2016*

**physics**

As an environmentally friendly idea, some have proposed using the temperature gradient of the ocean to generate electricity. This system would use the temperature gradient between the surface of the ocean (at about 200 C) and the water temperature at a depth of about 1 km (at ...
*June 16, 2016*

**Physics**

A multicylinder gasoline engine in an airplane, operating at 2500 rev/min, takes in 7800 J of energy and exhausts 4600 J for each revolution of its crankshaft. What is the mechanical power output of the engine in kilowatts.
*June 16, 2016*

**Physics**

200 degrees Celcius
*June 16, 2016*

**Physics**

On a beautiful baseball day with air temperature of 200 C, a pitcher throws a 0.142 kg baseball at 49 m/s towards home plate. As it travels 19.4 m, the ball slows down to a speed of 36 m/s because of air resistance. Calculate the change in the temperature of the air through ...
*June 16, 2016*

**Physics**

On a beautiful baseball day with air temperature of 200 C, a pitcher throws a 0.142 kg baseball at 51 m/s towards home plate. As it travels 19.4 m, the ball slows down to a speed of 36 m/s because of air resistance. Calculate the change in the temperature of the air through ...
*June 16, 2016*

**Physics**

A 20% efficient real engine is used to speed up a train from rest to 7.0 m/s. An ideal (Carnot) engine using the same cold and hot reservoir would accelerate the same train from rest to a speed of 8.0 m/s using the same amount of fuel. The cold reservoir is at 290 K. Find the ...
*June 16, 2016*

**Physics**

As an environmentally friendly idea, some have proposed using the temperature gradient of the ocean to generate electricity. This system would use the temperature gradient between the surface of the ocean (at about 200 C) and the water temperature at a depth of about 1 km (at ...
*June 16, 2016*