Friday

January 30, 2015

January 30, 2015

Total # Posts: 848

**Math. **

You repeatedly toss a fair coin for 5 times. What is the probability that heads comes up at least 3 times before tails comes up twice?
*November 1, 2013*

**Math**

Emory tosses a nickle four times. The probability that he gets at least as many heads as tails is? Explain
*November 1, 2013*

**Math**

Assume that 3 dice are thrown simultaneously. What is the probability that exactly one 4 will come up?
*November 1, 2013*

**Math**

Twenty marbles are in a bag. There are 5 green marbles, 9 blue marbles, and the rest are red. Two marbles are drawn at random without placement. Find the probability that neither is blue
*November 1, 2013*

** Math**

A coin is loaded in such way that a tail is three times as likely to occur as a head. If the coin is flipped twice. Find the probability that two heads occur
*November 1, 2013*

**grammar / english (10th grade)**

Two sentences: 1) The race among the three relay teams was close; none of the three; however, is giving up hope of winning. 2) The race among the three relay teams was close; however, none of the three is giving up hope of winning. Which is the correct one grammatically? ...
*October 22, 2013*

**Math**

Aaron has two types do iodine in his lab. He has brand 213 iodine, which costs 36 cents per ounce. He also has brand 856 iodine, which costs 1.58$ per ounce. How many ounces of brand 213 should be used if he has 63 ounces of brand 856 and wants to make a mixture that costs ...
*October 10, 2013*

**physics**

Spring on Incline The block in the figure is initially at rest on an inclined plane at the equilibrium position that it would have if there were no friction between the block and the plane. How much work is required to move the block 25 cm down the plane if the frictional ...
*October 9, 2013*

**world history**

the meaning of paleolithic age
*October 6, 2013*

**Spanish**

Thank you very much!
*September 22, 2013*

**Spanish**

I need to make each statement into a question using the interrogative words. Can someone revise the questions Adónde Cuándo Cuántos De dónde Dónde Por qué Qué Quién ¿ Dónde caminan Paco y Rosa? Paco y Rosa ...
*September 22, 2013*

**math **

We are doing improper fractions and they are talking about the Tee-pee method ,what is it
*September 17, 2013*

**physics lon capa **

A car starts from rest and travels for 4.93 s with a uniform acceleration of +1.53 m/s2. The driver then applies the brakes, causing a uniform acceleration of -1.99 m/s2. If the brakes are applied for 2.83 s, how fast is the car going at the end of the braking period?
*September 14, 2013*

**physics lon capa **

A car starts from rest and travels for 4.93 s with a uniform acceleration of +1.53 m/s2. The driver then applies the brakes, causing a uniform acceleration of -1.99 m/s2. If the brakes are applied for 2.83 s, how fast is the car going at the end of the braking period?
*September 14, 2013*

**physics**

-------------------------------------------------------------------------------- A tennis ball with a speed of 11.4 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 8.64 m/s. If the ball is in contact...
*September 14, 2013*

**Physics**

At t=0 a particle starts from rest at x=0, y=0 and moves in the xy plane with an acceleration a=(4.0i+3.0j)m/s^2. Determine (a) the x and y components of velocity, (b) the speed of the particle, and (c) the position of the particle, all as a function of time. (d) evaluate all ...
*September 12, 2013*

**chemistry**

A gas has a density of 5.56 g/L. a. What volume in milliliters would 4.17 g of this gas occupy? b. What would be the mass in kilograms of 1 m3 of this gas?
*September 11, 2013*

**chemistry**

A gas has a density of 5.56 g/L. a. What volume in milliliters would 4.17 g of this gas occupy? b. What would be the mass in kilograms of 1 m3 of this gas?
*September 11, 2013*

**chemistry**

A gas has a density of 5.56 g/L. a. What volume in milliliters would 4.17 g of this gas occupy? b. What would be the mass in kilograms of 1 m3 of this gas?
*September 11, 2013*

**Chemistry**

a chemist needs 2.00 grams of a liquid compound witha density of 0.785 g/cm^3 density. what volume of compund is required?
*September 3, 2013*

**Chemistry**

a chemist needs 2.00 grams of a liquid compound witha density of 0.785 g/cm^3 density. what volume of compund is required?
*September 3, 2013*

**math**

solve for x x-7/6=x+3/7
*August 20, 2013*

**Geometry **

If the distance from the top of a building to the tip of its shadow is 150 feet and the sun makes a 75 degree angle with the wall as shown in the image below, what is the length of the shadow?
*August 8, 2013*

**History**

Passed in 1935, Roosevelt's most significant reform measure was the
*August 4, 2013*

**math**

julia studied math for 3 1/3 hours during the 4 days before her last math test what was the average amount of time she studied each day
*May 14, 2013*

**Math**

The question I put in is all the information that was stated.
*May 4, 2013*

**Math**

A house.
*May 4, 2013*

**Math**

LeAnn is a carpet layer. She has agreed to carpet a house for $18 per square yard. The carpet will cost her $11 per square yard, and she knows that there is approximately 12% waste in cutting and matching. If she plans to make a profit of $580.80, how many yards of carpet will...
*May 4, 2013*

**math**

he purchased a total of 120 shares at a price of 3018 what was the unit price per share (4.2d)
*April 30, 2013*

**math**

3x-4y=-6 2x+6y=11
*April 28, 2013*

**Math**

What is the greatest number of points of intersection with three circles that have 6 intersections using four straight lines?
*April 25, 2013*

**Physics**

Two converging lenses are separated by 23.60 cm. The focal length of each lens is 12.60 cm. An object is placed 35.80 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right. Answer in cm
*April 23, 2013*

**Physics**

An object is placed 19.6 cm to the left of a diverging lens (f = -7.84 cm). A concave mirror (f = 11.2 cm) is placed 27.3 cm to the right of the lens Find the final image distance, measured relative to the mirror (cm)
*April 23, 2013*

**Algebra**

Solve the equation. Leave answer in simplest radical form. n^2-2n+1=5
*April 18, 2013*

**Physics**

A spherical mirror is polished on both sides. When the concave side is used as a mirror, the magnification is +3.0. What is the magnification when the convex side is used as a mirror, the object remaining the same distance from the mirror?
*April 17, 2013*

**Physics**

Identical objects are located at the same distance from two spherical mirrors, A and B. The magnifications produced by the mirrors are mA = 7.2 and mB = 1.1. Find the ratio fA/fB of the focal lengths of the mirrors.
*April 17, 2013*

**Algebra**

A baseball player hits a baseball into the air with an initial vertical velocity of 48 feet per second from a height of 3 feet. 8. Write an equation that gives the baseball’s height as a function of the time (in seconds) after it is hit. 9. After how many seconds does the...
*March 31, 2013*

**Physics**

The power radiated by the sun is 3.90 1026 W. The earth orbits the sun in a nearly circular orbit of radius 1.50 1011 m. The earth's axis of rotation is tilted by 27° relative to the plane of the orbit (see the drawing), so sunlight does not strike the equator ...
*March 26, 2013*

**Physics**

A stationary particle of charge q = 1.4 10-8 C is placed in a laser beam (an electromagnetic wave) whose intensity is 3.5 103 W/m2. Determine the magnitudes of the (a) electric and (b) magnetic forces exerted on the charge. If the charge is moving at a speed of 3.7 104 m/s ...
*March 26, 2013*

**Physics**

A beam of polarized light with an average intensity of 17.1 W/m2 is sent through a polarizer. The transmission axis makes an angle of 27° with respect to the direction of polarization. Determine the rms value of the electric field of the transmitted beam. Answer in N/C
*March 26, 2013*

**chemistry quick question**

...just change the methyl part to ethyl.... 2-ethyl-4-heptanol!
*March 25, 2013*

**Physics**

A series circuit contains only a resistor and an inductor. The voltage V of the generator is fixed. If R = 10 Ω and L = 4.2 mH, find the frequency at which the current is one-half its value at zero frequency? Answer in Hz
*March 21, 2013*

**Physics**

That wasn't the right answer, but thank you anyways!
*March 21, 2013*

**Physics**

In the absence of a nearby metal object, the two inductances (LA and LB) in a heterodyne metal detector are the same, and the resonant frequencies of the two oscillator circuits have the same value of 510.0 kHz. When the search coil (inductor B) is brought near a buried metal ...
*March 21, 2013*

**Physics**

A series RCL circuit has a resonant frequency of 1530 Hz. When operating at a frequency other than 1530 Hz, the circuit has a capacitive reactance of 5.0 Ω and an inductive reactance of 33.0 Ω. What is the value of L? (Answer in H) What it the value of C? (Answer in F)
*March 21, 2013*

**Physics**

Suppose that the light bulb in the figure is a 61.8-W bulb with a resistance of 218 Ω. The magnetic field has a magnitude of 0.37 T, and the length of the rod is 0.59 m. The only resistance in the circuit is that due to the bulb. What is the shortest distance along the ...
*March 14, 2013*

**Chemistry**

The number of moles NaOH needed to reach the equivalence point is mol, which means we must add liters of NaOH. The total volume of solution at the equivalence point will be liters. From the above information, the molarity of NaF at the equivalence point is M.
*March 13, 2013*

**Lang. Arts**

Why do you have to be so rude!?
*February 26, 2013*

**Chemistry**

at a pressure of 390.0 kPa, a sample of ideal gas containing 110. moles of propane is collected at a tempature of 55 degrees celcius. find the volume of the propane tank used
*February 25, 2013*

**Chemistry**

at a pressure of 390.0 kPa, a sample of ideal gas containing 110. moles of propane is collected at a tempature of 55 degrees celcius. find the volume of the propane tank used
*February 25, 2013*

**Physics**

A particle of mass 6.80 10-8 kg and charge 4.4-µC is traveling due east. It enters perpendicularly a magnetic field whose magnitude is 29.0 T. After entering the field, the particle completes one-half of a circle and exits the field traveling due west. How much time does...
*February 22, 2013*

**Physics**

Two resistances, R1 and R2, are connected in series across a 15-V battery. The current increases by 0.050 A when R2 is removed, leaving R1 connected across the battery. However, the current increases by just 0.025 A when R1 is removed, leaving R2 connected across the battery. ...
*February 21, 2013*

**Physics**

A cylindrical aluminum pipe of length 1.52 m has an inner radius of 2.20 10-3 m and an outer radius of 3.00 10-3 m. The interior of the pipe is completely filled with copper. What is the resistance of this unit? (Hint: Imagine that the pipe is connected between the terminals ...
*February 21, 2013*

**math**

the comparison would be 88<97 or 97>88, but I don't understand the "(Use a box for missing number)" ...
*February 19, 2013*

**Physics**

Two equipotential surfaces surround a +1.63 10-8-C point charge. How far is the 204-V surface from the 81.5-V surface? Answer in m.
*February 4, 2013*

**Physics**

Two particles, with identical positive charges and a separation of 2.65 10-2 m, are released from rest. Immediately after the release, particle 1 has an acceleration 1 whose magnitude is 4.25 103 m/s2, while particle 2 has an acceleration 2 whose magnitude is 8.60 103 m/s2. ...
*January 28, 2013*

**Physics #66**

Two charges are placed on the x axis. One of the charges (q1 = +9.3 µC) is at x1 = +3.4 cm and the other (q2 = -20 µC) is at x2 = +8.9 cm. (a) Find the net electric field (magnitude and direction) at x = 0 cm. (Use the sign of your answer to indicate the direction ...
*January 25, 2013*

**Physics #48**

An electron is released from rest at the negative plate of a parallel plate capacitor. The charge per unit area on each plate is σ = 1.67 10-7 C/m2, and the plate separation is 1.35 10-2 m. How fast is the electron moving just before it reaches the positive plate? Answer ...
*January 25, 2013*

**Physics #43**

A spring with an unstrained length of 0.076 m and a spring constant of 2.6 N/m hangs vertically downward from the ceiling. A uniform electric field directed vertically upward fills the region containing the spring. A sphere with a mass of 5.09 10-3 kg and a net charge of +6.5...
*January 25, 2013*

**Physics #16**

Two particles, with identical positive charges and a separation of 2.65 10-2 m, are released from rest. Immediately after the release, particle 1 has an acceleration 1 whose magnitude is 4.25 103 m/s2, while particle 2 has an acceleration 2 whose magnitude is 8.60 103 m/s2. ...
*January 25, 2013*

**Physics**

Four identical metallic objects carry the following charges: +7.0 µC, +9.0 µC, -4.6 µC, and -1.2 µC. The objects are brought simultaneously into contact, so that each touches the others. Then they are separated A) What is the final charge on each object...
*January 25, 2013*

**algebra 2**

A chauffer must decide between driving his clients in the rolls royce or the mercedes benz. the rolls royce costs 1.75 per mile to operate and the mercedes benz costs 2.00 per mile. The chauffer can charge 4.00 per mile for the rolls royce and 6.50 per mile for mercedes benz. ...
*January 24, 2013*

**math**

I LIKE TO DO MATH
*January 22, 2013*

**math **

Price: 172.00 tax rate 11%
*January 19, 2013*

**6th grade math**

4 x (3b-6) = 9 x (2b+3) 12b - 24 = 18b + 27 -6b = 51 b = -51/6
*January 17, 2013*

**texashistory**

h did geography adclimate impact the development oftexas
*December 30, 2012*

**College Algebra**

Rita has 88 feet of fencing. She wants to use this fencing to enclose a rectangular area of 480 square feet. What must the dimensions of her rectangular enclosure be?
*December 12, 2012*

**Math**

A ferris wheel is 30 meters in diameter and boarded in the six o'clock position from a platform that is 10 meters above the ground. The wheel completes one full revolution every 10 minutes. At the initial time t=0 you are in the twelve o'clock position.Find a formula, ...
*December 10, 2012*

**Math**

thanks!
*December 10, 2012*

**Math**

A motorist makes a journey of 240 km from Singapore to Malacca to visit his inlaws at an average speed of x kilometers. On his return journey, his average speed is reduced by 6km/hour due to traffic. If the return journey takes 20 minutes longer, form an equation with x and ...
*December 10, 2012*

**PLEASE HELP!! PHYSICS**

A 0.63-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.13 to 0.22 m (relative to its unstrained length), the speed of the sphere decreases from 5.95 to 4.75 m/s. What is the spring constant of the spring? (The sphere hangs from the ...
*December 1, 2012*

**sslope interception form **

write slope interception form the equation of the line thay passes through (0,-2) and is perpendicular to the line 3y-2x=5
*November 30, 2012*

**Physics**

A small ball is attached to one end of a spring that has an unstrained length of 0.202 m. The spring is held by the other end, and the ball is whirled around in a horizontal circle at a speed of 3.18 m/s. The spring remains nearly parallel to the ground during the motion and ...
*November 30, 2012*

**Physics**

A 15.0-kg block rests on a horizontal table and is attached to one end of a massless, horizontal spring. By pulling horizontally on the other end of the spring, someone causes the block to accelerate uniformly and reach a speed of 5.00 m/s in 0.460 s. In the process, the ...
*November 30, 2012*

**Physics**

A copper rod (length = 1.3 m, radius = 3.70 10-3 m) hangs down from the ceiling. A 8.3-kg object is attached to the lower end of the rod. The rod acts as a "spring", and the object oscillates vertically with a small amplitude. Ignoring the rod's mass, find the ...
*November 30, 2012*

**Physics**

A bungee jumper, whose mass is 81 kg, jumps from a tall platform. After reaching his lowest point, he continues to oscillate up and down, reaching the low point two more times in 8.9 s. Ignoring air resistance and assuming that the bungee cord is an ideal spring, determine its...
*November 30, 2012*

**Physics**

A loudspeaker diaphragm is producing a sound for 2.0 s by moving back and forth in a simple harmonic motion. The angular frequency of the motion is 8.55 104 rad/s. How many times does the diaphragm move back and forth?
*November 30, 2012*

**Physics**

A tow truck is pulling a car out of a ditch by means of a steel cable that is 9.3 m long and has a radius of 0.50 cm. When the car just begins to move, the tension in the cable is 1070 N. How much has the cable stretched? Answer in m
*November 30, 2012*

**Physics**

A 0.56-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.13 to 0.26 m (relative to its unstrained length), the speed of the sphere decreases from 5.45 to 4.90 m/s. What is the spring constant of the spring? (The sphere hangs from the ...
*November 30, 2012*

**Physics**

A 15.0-kg block rests on a horizontal table and is attached to one end of a massless, horizontal spring. By pulling horizontally on the other end of the spring, someone causes the block to accelerate uniformly and reach a speed of 5.00 m/s in 0.460 s. In the process, the ...
*November 29, 2012*

**Physics**

A small ball is attached to one end of a spring that has an unstrained length of 0.202 m. The spring is held by the other end, and the ball is whirled around in a horizontal circle at a speed of 3.18 m/s. The spring remains nearly parallel to the ground during the motion and ...
*November 29, 2012*

**Chemistry**

What is the chemical breakdown of a cheese pizza
*November 28, 2012*

**chemistry **

This soidum hydroxide solution was then used to determine the amount of acetic acid in vinegar. Three titrations of the sodium hydroxide solution against exactly 5mL of vinegar using phenolphthalein indicator required 22.85Ml, 22.67mL and 22.93mL of the sodium hydroxide ...
*November 25, 2012*

**English**

What is a great thesis statement for how supply and demand affects urbanization
*November 19, 2012*

**Physics**

Two disks are rotating about the same axis. Disk A has a moment of inertia of 3.8 kg · m2 and an angular velocity of +6.7 rad/s. Disk B is rotating with an angular velocity of -8.9 rad/s. The two disks are then linked together without the aid of any external torques, so...
*November 16, 2012*

**Physics**

A 13.6-m length of hose is wound around a reel, which is initially at rest. The moment of inertia of the reel is 0.40 kg · m2, and its radius is 0.151 m. When the reel is turning, friction at the axle exerts a torque of magnitude 3.42 N · m on the reel. If the ...
*November 16, 2012*

**Physics**

A 13.6-m length of hose is wound around a reel, which is initially at rest. The moment of inertia of the reel is 0.40 kg · m2, and its radius is 0.151 m. When the reel is turning, friction at the axle exerts a torque of magnitude 3.42 N · m on the reel. If the ...
*November 15, 2012*

**Physics**

Workers have loaded a delivery truck in such a way that its center of gravity is only slightly forward of the rear axle, as shown in the drawing. The mass of the truck and its contents is 8340 kg. Find the magnitudes of the forces exerted by the ground on the following. a) the...
*November 15, 2012*

**Physics**

A rotational axis is directed perpendicular to the plane of a square and is located as shown in the drawing. Two forces, 1 and 2, are applied to diagonally opposite corners, and act along the sides of the square, first as shown in part a and then as shown in part b of the ...
*November 15, 2012*

**Physics**

A square, 0.36 m on a side, is mounted so that it can rotate about an axis that passes through the center of the square. The axis is perpendicular to the plane of the square. A force of 14.4 N lies in this plane and is applied to the square. What is the magnitude of the ...
*November 15, 2012*

**Physics**

The wheel of a car has a radius of 0.390 m. The engine of the car applies a torque of 282 N · m to this wheel, which does not slip against the road surface. Since the wheel does not slip, the road must be applying a force of static friction to the wheel that produces a ...
*November 15, 2012*

**algebra 2 trig**

8/2+√6
*October 29, 2012*

**Chemistry**

Okay. Please check. If you can please show me how its done when you put it together. I have it scattered so I was a bit stuck when I tried to do each step. I know dimensional analysis allows the cross cancelling when you do it on paper and its hard to see whats cancelled in ...
*October 26, 2012*

**Chemistry**

I don't know exactly how to start this question: A sample gas contains 2.95 x 10e24 molecules. The sample is 21.0% oxygen. Calculate volume of oxygen in liters assuming oxygen has a density of 1.308 g/L. Please help me how to do this. I have been stuck and still trying to ...
*October 26, 2012*

**Chemistry**

Ok. Please. Check. Thank you both so much. Mass of water: 43.0-26.1=16.9 g H2O Moles of water: (16.9 g H2O)(1 mol H2O/18.0 g H2O)= 0.939 mol H2O Moles of cobalt (II) sulfite: CoSO3= 58.9332+32.066+3(15.9994)=138.9974 g/mol (26.1 g CuSO3)(1 mol CuSO4/138.9974 g CuSO3)= 0.188 ...
*October 26, 2012*

**Chemistry**

A 43.0 g sample of hydrated cobalt (II) sulfite is heated to drive off the water. The anhydrous cobalt (II) sulfite has a mass of 26.1 g. Calculate the mass of water. Calculate the moles of water. Calculate the moles of cobalt (II) sulfite. Calculate the mole ratio of water to...
*October 26, 2012*

**Science**

For periodic waves, frequency has an inverse relationship to the concept of wavelength. Frequency is inversely proportional to wavelength λ (lambda). The frequency f is equal to the phase velocity v of the wave divided by the wavelength λ of the wave. f= v/w In ...
*October 25, 2012*

**Physics**

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 92.5 kg. The mass of the rock is 0.310 kg. Initially the wagon is rolling forward at a speed of 0.550 m/s. ...
*October 22, 2012*

**Physics**

John's mass is 92 kg, and Barbara's is 67 kg. He is standing on the x axis at xJ = +7.50 m, while she is standing on the x axis at xB = +2.50 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch? Answer in ...
*October 22, 2012*

**Physics**

A girl is skipping stones across a lake. One of the stones accidentally ricochets off a toy boat that is initially at rest in the water (see the drawing below). The 0.094-kg stone strikes the boat at a velocity of 14 m/s, 15° below due east, and ricochets off at a velocity...
*October 22, 2012*

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