Thursday

August 25, 2016
Total # Posts: 948

**Optics (pls help)**

To save expenses, you would like to buy the shortest mirror that will allow you see your entire body, should the mirror be A) Half your height B) Two-thirds your height or C)equal to your height ? Does the answer depends on how far away from the mirror you stand? Please I need...
*August 15, 2016*

**Algebra**

C the power of two+18c-175=0 Help please?
*July 20, 2016*

**math**

ghhgh
*July 5, 2016*

**Physics**

The A above middle C has a frequency of 440 Hz. If you play this note on a piano and the piano string oscillates with an amplitude of 0.55 mm, what is the maximum acceleration of the string?
*June 9, 2016*

**Chemistry**

Spontaneous reactions ________. always release free energy*** always result in increase disorder of the system always take place at a rapid rate are always exothermic
*May 16, 2016*

**Chemistry**

Which of the following changes would shift the reaction shown here to the right (product side)? 4HCl (g) + O2(g) < = > 2Cl2 (g) + 2 H2O (g) addition of Cl2*** decrease of pressure increase of pressure removal of O2
*May 16, 2016*

**Chemistry**

Which of the following changes would shift the reaction shown here to the right (product side)? 4HCl (g) + O2(g) < = > 2Cl2 (g) + 2 H2O (g) addition of Cl2*** decrease of pressure increase of pressure removal of O2
*May 16, 2016*

**Chemistry**

At what stage of a reaction do atoms have the highest energy Product stage Reactant stage Transition state stage*** The stage of the highest energy depends on the atom
*May 16, 2016*

**Chemistry**

When 2.0 g of solid NaOH (∆Hsoln = -445.1kJ/mol) dissolves in 10L of water, how much heat is released? 445.1 kJ 44.51 kJ 22.26 kJ 11.13 kJ***
*May 16, 2016*

**Chemistry**

Calculate the energy required to produce 5.00 mol of Cl2O7 on the bases of the following balanced equation. 2Cl2(g) +7O2(g) +130kcal - - > 2 Cl2O7 5.00 kcal 65 kcal*** 130 kcal 325 kcal
*May 16, 2016*

**Chemistry**

What does the symbol ∆H stand for? one Calorie given off by a reaction the heat capacity of a substance*** the heat of a reaction for a chemical reaction the specific heat of a substance
*May 16, 2016*

**Chemistry**

Which of the following is the correct unit for specific heat? degree C*** Cal cal/g cal/(g*deg C)
*May 16, 2016*

**Chemistry**

The heat capacity of an object depends in part on its enthalpy mass potential energy*** shape
*May 16, 2016*

**Chemistry**

When your body breaks down sugar completely, how much heat is released compared to burning the same amount of sugar in a flame? The body releases___ less heat than the flame*** more heat than the flame same amount of heat as a flame the body releases so heat
*May 16, 2016*

**Chemistry**

What would likely happen if you were to touch a metallic beaker in which an endothermic reaction were occurring? The beaker would probably feel cooler than before the reaction started. The beaker would probably feel warmer than before the reaction started.*** The beaker would ...
*May 16, 2016*

**science**

mechanical to potential to gravitational
*May 13, 2016*

**Algebra**

Whats the question?
*May 13, 2016*

**Geometry**

Segment AD is perpendicular to the radius of circle (B) and the radius of circle (c). If radius BA=6in, segment AD=21in and radius CD=16in, find the length of BC to the nearest tenth of an inch.
*May 10, 2016*

**math**

The area of a plot of land is 2496 square meters. A small part of the land is fenced. The ratio of the area of the plot of land to the area that is not fenced is 48:31. What is the area of the land that is not fenced? (5th grade math)
*May 4, 2016*

**Chemistry**

A sample of sulfur hexafluoride gas (SF6) occupies a volume of 3.230 Liters at 7.011 x 101 oC. Assuming the pressure is constant, what will the final temperature be (in o C) if the volume is increased to 7.350 Liters?
*April 27, 2016*

**Physics**

A plane travels 1000 km at an angle of 40 degrees East to North, then changes direction and travels 500 km at an angle of 20 degrees North to East. What is the magnitude and direction of the planes total displacement?
*April 27, 2016*

**Chemistry**

How many grams of MgCl2 would be required to make 440 g of magnesium ?
*April 26, 2016*

**Physics **

The human heart discharges 75ml of blood at each beat against the pressure of 0.1mmHg. Calculate the power of the heart assuming that the purse frequency is 80 beats per minute.(density of mercury is 13.6*10^3 Kg/m3)
*April 20, 2016*

**PHYSICS!!**

This is also a part of it!! Coincidently the horn on your car, which you sound as you narrowly miss the flautist in problem 1, also give a constant 300 Hz. tone. What frequency does the flautist hear before and after you pass them?
*April 14, 2016*

**PHYSICS!!**

After giving an intense performance, a confused and disoriented flautist has wandered onto the motorway! They are playing a constant 300Hz on their flute and are essentially stationary If you are driving along the motorway at 100 km/h(27.8 m/s). What is the frequency you hear ...
*April 14, 2016*

**AP Physics**

Two identical, small balls are suspended by separate 0.25m threads that are attached to a common point on the ceiling. Each ball has a mass of 8.0 x 10^-4 kg. Initially the balls are uncharged and hang straight down. They are then given identical positive charges and, as a ...
*April 13, 2016*

**PHYSICS!!**

In its search for flying insects, a bat uses an echolocating system based on pulses of high frequency sound. These pulses are 2.0 ms in duration, have a frequency of 50 kHz, and an intensity level of 100 dB at 1.0 m from the bat’s mouth. Assume the bat produces acoustic ...
*April 13, 2016*

**L.o**

I don't know
*April 13, 2016*

**PHYSICS HELP!!**

Im so confused on how to calculate part b..... the rest of the answer i know how to solve it...
*April 11, 2016*

**PHYSICS HELP!!**

(a) Suppose 10 astronauts are sent to Mars and then back to Earth. The average power usage of each astronaut is 10,000,000 joules per day. What is the average power usage of each astronaut in watts and horsepower? (b) It will take approximately 2 years for the astronauts to ...
*April 11, 2016*

**Math**

Three Bases and home plate make a diamond that is 90 feet on each side. What is the perimeter of the diamond?
*April 6, 2016*

**Chemistry **

Calculate how many grams of MgO that can be produced from 4.58 of Mg metal and 0.99 of O2 gas. Recall the balanced reaction is: 2 Mg (s) + O2 (g) 2 MgO (s) And the answers to part one were: Moles of MgO from 4.58 g Mg = 0.1884 Moles of MgO from 0.99 g O2 = 0.0619 Limiting ...
*March 28, 2016*

**Chemistry **

If 12.01 g of Mg metal and 6.56 g of O2 gas are reacted, 1) How many moles of MgO can be produced from the given mass of Mg? 2) How many moles of MgO can be produced from the given mass of O2? 3) From the above calculations, determine which of the reactants is the limiting ...
*March 28, 2016*

**Chemistry **

If 12.01 g of Mg metal and 6.56 g of O2 gas are reacted, 1) How many moles of MgO can be produced from the given mass of Mg? 2) How many moles of MgO can be produced from the given mass of O2? 3) From the above calculations, determine which of the reactants is the limiting ...
*March 28, 2016*

**Chemistry **

Given that you are starting with 20.816 grams of Fe and 7.079 grams of O2, what is the THEORETICAL YIELD of Fe2O3 in moles?
*March 28, 2016*

**Math**

A certian recipe asks for 5/8 cup of granola. How much is needed to make 1/9 of a recipe?
*March 27, 2016*

**Algebra**

A campground consists of 8 square campsites arranged in a line along a beach. The distance from the edge of a campsite to the water at the end of the beach is 5 yards. The area of the campground, including the beach, is 1102 square yards. What is the width of one campsite? -9....
*March 24, 2016*

**Physics**

A missile is fired with a launch velocity of 15000 ft/s at a target 1200 miles away. At what angle must it be fired to hit the target? Use g = 32 ft/s.s
*March 11, 2016*

**Math**

But that's all the information
*March 7, 2016*

**Ms. Sue???**

Can you help me
*March 7, 2016*

**Math**

The pool is partially filled with water. The volume of the water in the pool is 45 cubic feet. How deep is the water? A.0.5 ft B.1.5 ft C.2.5 ft** D.3.5 ft Am I right?
*March 7, 2016*

**Chemistry**

A flask of hydrogen gas is collected at 1.023 atm and 35 degrees C by displacement of water at 35 degrees C is 42.2 mm Hg. What is the partial pressure of hydrogen gas in the flask? Not exactly sure where to start with this question, or what formula to use. Thanks in advance
*March 6, 2016*

**Differential equation (urgent pls!!!)**

Reduce the differential equation below to an exact equation (X - 2siny + 3)dx -(4siny - 2x + 3)dy=0. The problem here is how to solve for the integrating factor...any help pls?
*March 4, 2016*

**maths(Differential Equation)**

Solve the differential equation below (Y + y^3/3 + x^2/2)dx + 1/4(1 + y^2)xdy=0
*March 3, 2016*

**Accelerated algebra**

Comet C has an elliptical orbit of eccentricity 0.9638 with the sun at one focus. The greatest distance of the comet from the sun is 2940 million miles. Find the least distance between the comet C and the sun.
*March 1, 2016*

**Physics **

Electrons in a narrow beam travelling at a steady speed of 5 x 10^7 ms^-1 are directed into the space between two oppositely charged parallel plates 50mm apart. The potential difference between the plates is 2500V. The initial direction of the beam is parallel to the plates. ...
*February 17, 2016*

**Physics - Electrons (Inside the atom)**

Thank you
*February 17, 2016*

**Physics - Electrons (Inside the atom)**

A beam of electrons is directed into uniform electric and magnetic feilds that are at right angles to one another and to the beam direction. The strength of the magnetic feild is 55 mT; the electric feild strength is adjusted to 600 kV m^-1 when the beam passed through the ...
*February 17, 2016*

**Calculus**

Find the area of the region bounded by the graphs of y = x, y = 6 - 2x, and y = 0. (4 points) 3 6 9 None of these Please help I don't know how to do this
*February 14, 2016*

**Algebra**

(60/x)x66=400
*February 11, 2016*

**Science (Physics) **

A ball is projected horizontally from the top a hill with a velocity f 30mls. If it reaches the ground 5seconds later, the height of the hill is?
*February 11, 2016*

**Science (Physics) **

A ball is projected horizontally from the top a hill with a velocity of 30mls. If it reaches the ground 5seconds later, the height of the hill is?
*February 11, 2016*

**STAT**

0.2
*January 6, 2016*

**College physics**

a person drives northward (90 degrees) at 15m/s in a truck that weighs 2500kg. a second person driving a car that weighs 1600 kg drives southwest (225 degrees) at 16 m/s. They have a perfectly inelastic collision. What is the direction and speed of the two vehicles immediately...
*November 22, 2015*

**science**

a horizontal beam 6.8m long of mass 15kg is supported by pillars of 0.2 of each end. There is a man of mass 85 kg standing 1.7kg from one end of the beam .draw a diagram showing the forces acting on the beam in this equilibrium condition .calculate the magnitudes of the loads...
*November 14, 2015*

**World history**

Thank you
*November 10, 2015*

**World history**

What influenced the scientific revolution?
*November 10, 2015*

**math**

THANK YOU!!
*November 2, 2015*

**math**

The discounted price of a book is 85% of the original price. This is a savings of $3. A sales tax of 8% will be added to the discounted price. What is the original price? the discounted price? and the tax?
*November 2, 2015*

**English**

What was the answers?
*October 28, 2015*

**English Check please**

what were these answers?
*October 26, 2015*

**Math **

4x(x-2)=(2x+1)(2x-3) need help to solve
*October 13, 2015*

**prasanna high school**

Maths quection inam A.P. The sum of first six terms is 6an the product of second term and fifth term is -80. Find the terms of A.P.
*October 8, 2015*

**4**

Bobby has 230 marbles to put in jars. He wants the jars to hold either 100 marbles or 10 marbles. Which is a way he can arrange the marbles?
*October 4, 2015*

**Math Help- Test Tomorrow!**

We were doing review in class today and I remembered this one question I never got(though I don't have the specific question with me anymore). 1. It was a composite function question that asked for 'a' when f(g(a))=1. We were provided with the graphs of f(x) and g(...
*September 22, 2015*

**Math**

The function f(x)=x^2+5x+6 has zeros at -2 and -3. What are the zeros of the function y=-2f(x/11) ? Do you just plug x/11 into each x value in f(x)? Like f(x)= (x/11)^2+5(x/11)+6 (I exclueded the -2 because if I divide 0 by -2, it's still zero)? But then how can you find ...
*September 21, 2015*

**discrete math**

sorry its proof by cases
*September 12, 2015*

**discrete math**

4m+5n^2=20 (proof by cares)
*September 12, 2015*

**Science**

On a 120 km trip a motorist travels 60 km at 60 km/h. How fast must the motorist go for the next 60km in order to average 120km/h for the whole trip? i have attempted this question, yet the answers say it is impossible.
*September 12, 2015*

**Physics**

At a carnival, you can try to ring a bell by striking a target with a 8.46-kg hammer. In response, a 0.411-kg metal piece is sent upward toward the bell, which is 5.22 m above. Suppose that 34.4 percent of the hammer's kinetic energy is used to do the work of sending the ...
*August 27, 2015*

**Physics**

A skier slides horizontally along the snow for a distance of 12.1 m before coming to rest. The coefficient of kinetic friction between the skier and the snow is 0.0343. Initially, how fast was the skier going?
*August 27, 2015*

**physics**

The person in the drawing is standing on crutches. Assume that the force exerted on each crutch by the ground is directed along the crutch, as the force vectors in the drawing indicate. If the coefficient of static friction between a crutch and the ground is 0.793, determine ...
*August 12, 2015*

**physics**

The drawing shows a wire tooth brace used by orthodontists. The top-most tooth is protruding slightly, and the tension in the wire exerts two forces, and , on this tooth in order to bring it back into alignment. If the forces have the same magnitude of 19.4 N, what is the ...
*August 12, 2015*

**physics**

A 72.2-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.53 m/s2, (b) moving upward at a constant speed, and (c) accelerating downward with an acceleration of 1.44 m/s2?
*August 12, 2015*

**Physics**

helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 108-kg laser sensor which measures the thickness of the ice (see the drawing). The helicopter and the sensor move only in the horizontal direction and have a horizontal acceleration of ...
*August 12, 2015*

**Physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 6.54 m/s. The car is a distance d away. The bear is 26.0 m behind the tourist and running at 10.4 m/s. The tourist reaches the car safely. What is the maximum possible value for d?
*August 11, 2015*

**math algebra**

oh ok thanks!
*July 29, 2015*

**math algebra**

Jo needs to know which of the following cannot be a prime number whenever p is a prime number greater than 2001. A. p-2 B. p+2 C. p+999 D. p+9990 Im stuck
*July 29, 2015*

**math**

Jo needs to know which of the following cannot be a prime number whenever p is a prime number greater than 2001. A. p-2 B. p+2 C. p+999 D. p+9990
*July 29, 2015*

**Math **

The roots of x^2-999999x-9999=0 and ? are additive intergers A. x^2+999999x-9999=0 B. x^2-999999x+9999=0 C. x^2+999999x+9999=0 D. x^2-9999x-999999=0
*July 28, 2015*

**math**

The roots of x^2-999999x-9999=0 and ? are additive intergers A. x^2+999999x-9999=0 B. x^2-999999x+9999=0 C. x^2+999999x+9999=0 D. x^2-9999x-999999=0
*July 28, 2015*

**math**

When n= ?, one term in the expansion of (2x^2+3x+2)^n is 1024. A. 4 B. 8 C. 9 D. 10
*July 28, 2015*

**Math**

One solution contains 25% as much water as alcohol and another solution contains 5 times as much water as alcohol. How many gallons of each solution must be mixed in order to obtain 7 gallons of the new solution which contains as much water as alcohol? Please help. I don't...
*July 27, 2015*

**physics(kinematics)**

Thanks guys, I really appreciate your effort.
*July 19, 2015*

**physics(kinematics)**

The acceleration of a particle is defined by the relation a=-8m/s2. Knowing that x=20m when t=4 and that x=4m when v=16m/s. Determine. A)the time when the velocity is zero. B)the velocity and total distance traveled when t=11s.
*July 19, 2015*

**Biology**

1 bacteria 2 I don't know 3 cells?
*July 15, 2015*

**Biology**

1) Mucus traps __________. 2) The windpipe is lined with sticky __________ and microscopic __________. 3) Tiny microscopic __________ are called cilia.
*July 15, 2015*

**Chemistry Please Help Thanks!**

Calculate the volume of solution that has a vapour pressure of 25.8 mbar and contains 200.3 g of galactose, C6H12O6, at a temperature of 22.0 °C. The vapour pressure of pure water at 22 °C is 26.40 mbar, the density of water is 1.00 g mL-1, and assume no change in ...
*June 4, 2015*

**Physics**

Two ropes are attached to a wagon, one horizontal to the west with a tension force of 40 N and the other east at an angle of 23° northward and a tension force of 50 N. Find the components of the net force on the cart
*May 18, 2015*

**math**

The ratio of girls to boys in Liza’s classroom is 5 to 4. How many girls are in her classroom if there is a total of 27 students?
*May 14, 2015*

**calculus**

Please do,I'm waiting...
*May 8, 2015*

**calculus**

Integral of 1/[x^2(1+x^2)]
*May 8, 2015*

**math stuck please help!!!**

A private plane traveled from Seattle to a rugged wilderness , at an average speed of 252 mph . on the return trip , the average speed was 180 mph . if the total time was 9 hours how far is Seattle from the wildness
*May 8, 2015*

**calculus(urgent pls) **

Integral of 1/[x^2(1+x^2)]
*May 8, 2015*

**chemistry**

Higher signal to noise signal ratios can be achieved in FTIR spectra compared to spectra from dispersive ir instrument. how is such a useful feat achieved in ftir
*May 8, 2015*

**Calculus(URGENT PLS!!!)**

Find the integral of (e^cosx)sinx
*May 8, 2015*

**Maths(URGENT ANSWER please )**

Find the sum to infinity of the series 1 + 4/3! + 6/4! + 8/5!
*May 2, 2015*

**Maths(URGENT ANSWER please :**

The book says the a answer is 2
*May 2, 2015*

**Maths(URGENT ANSWER please :**

Find the sum to infinity of the series 1 + 4/3! + 6/4! + 8/5!
*May 2, 2015*