Friday

March 27, 2015

March 27, 2015

Total # Posts: 511

**math**

Sam had 80 foreign stamps and local stamps. After giving away13of his foreign stamps and 10 local stamps, he had an equal number of foreign stamps and local stamps left. How many local stamps did he have in the beginning?
*March 20, 2015*

**Phyisics**

1. Two concentric conducting spherical shells have radii of 0.126 m. and 0.225 m. The inner sphere bears a charge of -8.00E-08 C. An electron escapes from the inner sphere with negligible speed. Assuming that the region between the spheres is a vacuum, compute the speed (in ...
*March 18, 2015*

**Phyisics**

3. A small sphere whose mass is 8.00E-03 g. carries a charge of 7.00E-08 C. It hangs from a silk thread which makes an angle of 30 degrees with a large charged, nonconducting sheet. Calculate the surface charge density (in coulombs/meter^2) for the sheet.
*March 18, 2015*

**math**

Lexi and Maria had $250 altogether. After Lexi spent25of her money and Maria spent $40, they had the same amount of money left. How much money did Lexi have in the beginning?
*March 12, 2015*

**physics**

a car set out at noon to ride from point a to point b, and another car started at 2 pm on the same day to ride from point b to point a. they met on the road at 4:05 pm, and each car reached their destination at exactly the same time. at what time did the car arrive?(hint: both...
*March 10, 2015*

**physics**

4. A ball is thrown so that it just clears a 3m fence 18m away. If it left the hand 1.5m above the ground and at an angle of 60° with the horizontal, what was the initial velocity of the ball?
*March 10, 2015*

**math**

At what value(s) of x does f(x)=(-4x^4)+(2x^2) have a relative maximum?
*February 2, 2015*

**math**

For what values of x is the graph y=2/(5-x) concave upward? x<5 x>-5 x>5 no values of x
*February 2, 2015*

**Physics**

A 50 kg satellite circles the earth in an orbit with a period of 110 min. What minimum energy E is required to change the orbit to one with a period of 320 min? Assume both the initial and final orbits are circular. The Earth’s radius is 6.37 × 10^6 m, its mass is 5...
*January 30, 2015*

**Pre-Calc**

Through how many radians does a circle of radius 1 foot rotate if it rolls 10 feet down the road?
*January 16, 2015*

**math**

just answer my question
*January 11, 2015*

**math**

simplify: 6-y/6/1/6-1/y 6-y/6*6y/y-6= 6y/6=y Is this correct help i need help!!
*January 11, 2015*

**math**

thats my middle name
*January 11, 2015*

**math**

simplify: square root (4/3)-square root (3/4) A. 2-sqaure root(3)/2 square root (3) B. square root (7/12) C. square root (3)/6 D. 2/square root (3) which answer? this is what i got square root (16/12)- square root (9/12)= square root (7/12)
*January 11, 2015*

**college pre-calculus**

how do you do it
*January 11, 2015*

**math**

For the curve given by 4x^2+y^2=48+2xy, show that there is a point P with x-coordinate 2 at which the line tangent to the curve at P is horizontal.
*December 31, 2014*

**math**

For the curve given by 4x^2+y^2=48+2xy, find the positive y-coordinate given that the x-coordinate is 2.
*December 31, 2014*

**math**

For the curve given by 4x^2+y^2=48+2xy show that ((dy)/(dx))=(y-4x)/(y-x)
*December 31, 2014*

**Math**

The twice–differentiable function f is defined for all real numbers and satisfies the following conditions: f(0)=3 f′(0)=5 f″(0)=7 a)The function g is given by g(x)=e^ax+f(x) for all real numbers, where a is a constant. Find g ′(0) and g ″(0) in ...
*December 29, 2014*

**algebra**

someone know about adding and subtracting denominator
*November 24, 2014*

**algebra**

Perform the indicated operation y/y-5+5/5-y
*November 24, 2014*

**algebra**

Which of the following points lies on the circle whose center is at the origin and whose radius is 10 (-6,4) (/10,/10) (6,-8)
*November 21, 2014*

**algebra**

thank's
*November 21, 2014*

**algebra**

The length of a rectangle is 3 more than twice the width. The area of the rectangle is 119 square inches. What are the dimensions of the rectangle? If x = the width of the rectangle, which of the following equations is used in the process of solving this problem?
*November 21, 2014*

**plz help. math**

alright thank you
*November 21, 2014*

**algerbra**

A triangle has sides of and 3. Which could not be the length of the third side if it is a right triangle? i need help anyone?
*November 21, 2014*

**algebra**

Solve this quadratic equation x^2 + 5x + 3 = 0
*November 21, 2014*

**Science**

"What amount of Barium hydroxide is needed to neutralize 500 kg of 18 molar Sulphuric acid?"
*November 2, 2014*

**Law**

Discuss the power lies within the Parliament in UK and whether the power of parliament had been limited in the present day.
*November 2, 2014*

**Constitutional Law**

Thanks Ms Sue will start off my assignment soon
*November 2, 2014*

**physics**

A block of mass m1 = 2.4 kg slides along a frictionless table with a speed of 8 m/s. Directly in front of it, and moving in the same direction, is a block of mass m2 = 5.0 kg moving at 2.8 m/s. A massless spring with spring constant k = 1140 N/m is attached to the near side of...
*October 17, 2014*

**Physics**

Damon, Thank you so much
*October 15, 2014*

**Physics**

A 38.0-kg boy, riding a 2.37-kg skateboard at a velocity of +5.07 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.06 m/s, 10.35° above the horizontal. Ignore any...
*October 15, 2014*

**Physics**

The speed of the car at the base of a 30 ft hill is 45 mi/h. Assuming the driver keeps her foot off the brake and accelerator pedals, what will be the speed of the car at the top of the hill?
*October 15, 2014*

**Physics**

The pilot of an aircraft wishes to fly due west in a 50.0 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 228 km/h. a) How many degrees from west should the aircraft head? Let clockwise be positive. Answer in units of degrees. b) What ...
*October 15, 2014*

**Physics**

A basketball player makes a jump shot. The 0.580-kg ball is released at a height of 1.90 m above the floor with a speed of 7.18 m/s. The ball goes through the net 3.05 m above the floor at a speed of 4.23 m/s. What is the work done on the ball by air resistance, a ...
*October 11, 2014*

**Physics**

ahhh thanks but just a tad late lol, due already
*October 10, 2014*

**Physics**

A camera falls from a blimp that is 399 m above the ground and rising at a speed of 9.75 m/s. Find the maximum height reached by the camera with respect to the ground. The acceleration of gravity is 9.8 m/s^2.Answer in units of m. b)Find the speed at which it hits the ground....
*October 10, 2014*

**Physics**

Buddy is unloading 7kg cans using a 45 degree downward ramp. The ramp was made slippery by the a detergent spill before. Buddy can push the cans off of his truck with an initial velocity of .2 m/s and it moves as 1.2 m/a by the time it reaches the lowest point on the ramp. The...
*October 7, 2014*

**Physics **

The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a speed of 18.5 m/s via ...
*October 3, 2014*

**Physics **

A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far ...
*October 3, 2014*

**PHYSICS**

Starting from rest, a 2.0 10-4-kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.36 N on it. This force does +2.5 10-4 J of work on the flea. -How far does the flea move while it's pushing off?
*October 3, 2014*

**PHYSICS**

nvm I solved it
*October 3, 2014*

**PHYSICS**

A golf club strikes a 0.041-kg golf ball in order to launch it from the tee. For simplicity, assume that the average net force applied to the ball acts parallel to the ball's motion, has a magnitude of 6400 N, and is in contact with the ball for a distance of 0.012 m. With...
*October 3, 2014*

**Physics**

The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a speed of 18.5 m/s via ...
*October 3, 2014*

**Physics**

A 36-kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 185 J from 460 J. How high does she rise during this interval? Neglect air resistance.
*October 3, 2014*

**Physics**

A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far ...
*October 3, 2014*

**College algebra**

There were 40,000 people at a ball game in Los Angeles. The days receipts were 298,000. How many people paid $12.00 for reserved seats and how many paid $5.00 for general admission?
*October 1, 2014*

**Reading/language arts**

help
*September 27, 2014*

**Reading/language arts**

Write a sentence for the given topic, using a form of one of the following linking verbs in each sentence: smell, sound, feel, taste, grow. Use at least one predicate noun or predicate adjective in each sentence. 1) (dificulty or ease of writing) can you please help me by ...
*September 27, 2014*

**US History**

truck drivers
*September 27, 2014*

**Physics**

Consider two spherical stones with same density (mass per unit volume). The larger stone has radius R = 8.58 cm and the smaller stone has radius r = 3.37 cm. Find the ratio of the terminal speed in air of the larger stone to that of the smaller stone.
*September 25, 2014*

**Physics**

13.36 m/s^2
*September 25, 2014*

**Physics **

Air rushing over the wings of high-performance race cars generates unwanted horizontal air resistance but also causes a vertical downforce, which helps the cars hug the track more securely. The coefficient of static friction between the track and the tires of a 650-kg race car...
*September 25, 2014*

**Physics**

Vx=Ux+at Vx=16.1-(.65*9.81)(1.2) Vx=8.4482
*September 25, 2014*

**Physics **

Traveling at a speed of 16.1 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.650. What is the speed of the automobile after 1.20 s have elapsed? Ignore the effects of ...
*September 25, 2014*

**math**

using comparative thinking which equations are true a.50+64=62+48 b.50+64=62+62 c.50+64=124+52 d.50+64=66+52
*September 24, 2014*

**PHYSICS **

The weight of an object is the same on two different planets. The mass of planet A is only thirty-five percent that of planet B. Find the ratio rA/rB of the radii of the planets.
*September 20, 2014*

**Physics **

An electron is a subatomic particle (m = 9.11 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.06 105 m/s to a final velocity of +2.03 106 m/s while traveling a distance of 0.034 m. The electron'...
*September 20, 2014*

**physics **

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.850 m/s at an angle of 34.3° above the table, and it lands on the magazine 0.0780 s after leaving the table. Ignore air resistance. How thick is the magazine? ...
*September 13, 2014*

**Physics **

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 5.53 m. The stones are thrown with the same speed of 8.62 m/s. Find the location (above the base of the ...
*September 13, 2014*

**Physics**

How long is Mayra, a ballerina, in the air when she leaps striaght up with a speed of 1.23 m/s?
*September 11, 2014*

**MAT 222**

-10 < -2 + 8x < 22 compound inequalities
*June 23, 2014*

**Chemistry**

how many moles of oxygen are needed to react with 3.5 moles of isopropyl alcohol, C3H7OH
*June 5, 2014*

**Multiple Choice**

Physics 2. Which of the following is equivalent to one ampere? (Points : 1) 10 s/10 C 10 C/10 m 1.5 C/1.5 s 15 C/10 s Question 3.3. A stream of moving charges results in a current of 5.6 A. How long does 116 C of charge take to flow past a fixed point? (Points : 1) 2.0 s 5.6 s...
*May 8, 2014*

**science**

The amplitude is given in the equation = .30
*May 1, 2014*

**math**

write and solve an equation to find the missing dimension of the rectangular prism. Volume= 1km cubic L=3/4 km W=2/3 km H= ?
*April 28, 2014*

**Biology**

your welcome
*April 28, 2014*

**Biology**

yes its hard to pick between b and d.
*April 28, 2014*

**Math**

0.30 rounded
*April 28, 2014*

**Math**

7x7x2=28 cubic inches
*April 28, 2014*

**Math **

A calendar that has one page per day is 7 inches long, 7 inches wide, and 2 inches high. What is the volume of one page of the calendar? Round your answer to the nearest thousandth.
*April 28, 2014*

**Math**

help MS.SUE
*April 28, 2014*

**Math**

what happens to the volume of a rectangle if you multiply the length, the width, and the height by 2?
*April 28, 2014*

**Math**

HELP!!!!!!!!!!!!!!!!!!
*April 28, 2014*

**Math**

What happens to the volume of a rectangular prism length, the width, and the height by 2?
*April 28, 2014*

**math**

HELP PLS I NEED TO DO HOMEWORK.
*April 28, 2014*

**math**

A cube with side length 4 centimeters is 25% full of sand.What is the volume of the sand?
*April 28, 2014*

**Math**

A filling cabinet is 35 centimeters by 70 centimeters by 115 centimeters. The bottom drawer is 30% of the volume of the filling cabinet. What is the volume of the bottom drawer?
*April 28, 2014*

**reading**

YES good job! Nice Essay! i would give it an A+
*April 28, 2014*

**reading**

i would add "Many woman suffer but Ida Tarbell changed that".
*April 28, 2014*

**reading**

youre right i agree
*April 28, 2014*

**Science**

1. How does sea-floor spreading occur? A. New materials are being added to the asthenosphere. B. Earthquakes brake apart the ocean floor. C. Sediments accumulate at the area of spreading. D. Molten material beneath Earth's crust rises to the surface.*
*April 22, 2014*

**math**

The director of the center has asked you to design a garden. The director has asked you to design different sections of the garden that meet the following: Section 1 must be shaped like a square. Section 1 must have an area between 26 square feet and 50 square feet. section 2 ...
*April 13, 2014*

**chemistry**

You need to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solution. You have a 0.1896 M standard solution. You take a 25.00 mL sample of the original acid solution and dilute it to 250.0 mL. You then take a 10.00 mL ...
*April 11, 2014*

**science**

Describe DNA replication in prokaryotes. Include the major steps for origins of replication, unwinding DNA, and synthesis of new strands. Include at least 1 simplified diagram.
*April 8, 2014*

**science **

Using your knowledge of physiology, genes and evolution, discuss organism adaptations to the environment using clear and specific examples.
*April 8, 2014*

**science**

22. Given that humans thermoregulate, explain why your skin is cooler than your body core.
*April 8, 2014*

**Math**

Monique is making cookies for the pajama party at her house. She has 3-1/2 cups of sugar. The recipe calls for 3/4 cup of sugar for one batch of cookies. Write an equation that can be used to find c, the total number of batches of cookies she can make.
*April 7, 2014*

**Math **

What is the distance between (-2,-5) and its reflection over the x-axis?
*April 7, 2014*

**Math**

thanks
*April 7, 2014*

**Math**

At a baseball stadium, every eighth person received a coupon for free popcorn. Every thirtieth person received a free hot dog. WHich person was the first to receive both free gifts?
*April 7, 2014*

**Physics**

All I'm looking for is confirmation that I correctly solved the problem. I know that I can use the formula: λ(wavelength) = v/f When I put in the numbers it gives me 5.666666666666667, which I then round up to 5.7. Is 5.7m the correct answer?
*March 19, 2014*

**Physics**

Bats chirp at a high frequency which humans cannot hear. They use the echoes to detect small objects, such as insects, as small as one wavelength. If a bat were to emit a chirp at a frequency of 60.0 kHz and the speed of sound waves in the air are 340 m.s, what is the size in ...
*March 19, 2014*

**chemistry**

thank you!
*March 17, 2014*

**chemistry**

A laboratory instructor gives you a test tube containing Ag+ ,Ba 2+ , and Cu 2+ ions. Devise a reaction scheme that would allow you to selectively precipitate each of these ions. Write a balanced net ionic equation for each precipitation reaction.
*March 17, 2014*

**college chemistry**

Copper(II) sulfide reacts with oxygen to produce copper (II) oxide plus sulfur dioxide. Suppose you start this reaction with 50.0 grams of copper(II) sulfide and 50.0 grams of oxygen and you actually produce 33.5 grams of copper(II) oxide. Calculate the percent yield for the ...
*March 5, 2014*

**chemistry**

Copper(II) sulfide reacts with oxygen to produce copper (II) oxide plus sulfur dioxide. Suppose you start this reaction with 50.0 grams of copper(II) sulfide and 50.0 grams of oxygen and you actually produce 33.5 grams of copper(II) oxide. Calculate the percent yield for the ...
*March 5, 2014*

**science**

Two forces of 5 N and 12 N respectivlely act on the same point. Show how to determine the magnitude of the resultant by using the tail to head and tail to tail methods and pythagoras theorem.
*February 22, 2014*

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