Monday

May 4, 2015

May 4, 2015

Total # Posts: 353

**calculus**

a spotlight on the ground shines on a wall 12 m away. if a man 2m tall walks from the spotlight toward the building at a speed of 1.6m/s, how fast is the length of his shadow on the building decreasing when he is 4m from the building?
*October 14, 2010*

**calculus**

A. find y' by implicit differentiation. B. solve th equation explicitly for y and differentiate to get y' in terms of x. cos (x) + √y = 5
*October 14, 2010*

**calculus**

finf y'' by implict differentiation √x + √y = 1
*October 14, 2010*

**US history **

why is it 1?
*October 12, 2010*

**math**

A ladder 10 ft long rests against a vertical wall. let θ be the angle between the top of the ladder and the wall and let x be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does x change with respect...
*October 7, 2010*

**calculus**

A ladder 10 ft long rests against a vertical wall. let θ be the angle between the top of the ladder and the wall and let x be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does x change with respect...
*October 7, 2010*

**calculus**

find an equation of the tangent line to the curve y = x √x that is parallel to the line y = 1 + 3x.
*October 7, 2010*

**calculus**

If f(x) = sec x, find f''(π/4).
*October 6, 2010*

**calculus**

find an equation of the tangent line to the curve y = x √x that is parallel to the line y = 1 + 3x.
*October 6, 2010*

**calculus**

find h'(2) given that f(2) = -3, g(2) = 4, f'(2)= -2 and g'(2)= 7. A. h(x) = 5f(x) - 4g(x) B. h(x) = f(x)g(x) C. h(x) = f(x)/g(x) D. h(x) = g(x)/ 1+ f(x)
*October 6, 2010*

**college**

After you work out at the gym on a stationary bike for 43.0 minutes, the distance guage indicated that you have traveled 14.8 miles. What was your rate in km/hr?
*September 20, 2010*

**English**

In my class we were reading a short story call The Pedestrian by ray bradbury and my teacher ask me a bunch of questions like for example What is the theme of the story but i dont get the question ? i didnt understand the story neither
*September 15, 2010*

**math**

a spherical balloon with radius r inches has volume V9r) =(4/3)πr^3. Find a function that represents the amount of air required to inflate the balloon from a radius of r inches to a radius of r+1 inches
*September 12, 2010*

**algebra 1**

15.6+x for x= -17.9
*September 12, 2010*

**algebra 1**

3-( -6 1/4 )
*September 12, 2010*

**algebra**

order the following numbers from greatest to least : 3.8 , -4.3 , -4.1 . express the answers by usinq < , <_ ,> , _>
*September 5, 2010*

**algebra**

use the integer to represent a withdrawal of $125 from a bank account. ( i need help )
*September 5, 2010*

**capt math**

to convert from ounces to pounds, you can multiply the nymber of ounces by 0.0625. express 0.0625 in scientific notation. : can you please help me express it. thanks
*September 5, 2010*

**10th grade**

thanks i qot n= 12
*September 5, 2010*

**10th grade**

am i suppose too divided 9 when i multiply 27 with 4 ?
*September 5, 2010*

**10th grade**

for which value of n will the function 4/9 and n/27 be equivalent?
*September 5, 2010*

**Physics**

You drop a ball from a height of 2.0 m and it bounces back to a height of 1.5 m (a) What fraction of its initial energy is lost during the bounce? (b) What is the ball’s speed just at it leaves the ground after the bounce?
*August 15, 2010*

**psychology**

what are the main difference of traits and psychodynamic theory?
*July 12, 2010*

**social studies**

A study of the causes of the American Revolution of 1776, the French Revolution of 1789, and the Russian Revolution of 1917 best supports the generalization that revolution is most likely to occur when
*June 20, 2010*

**Trig**

Find three additional polar representation of the point (-3, pie over 6) given in polar coordinates,using -2 pie <0 <2pie.
*May 20, 2010*

**Statistics**

Assume the body temperatures of healthy adults are normally distributed with a mean of 98.20 °F and a standard deviation of 0.62 °F (based on data from the University of Maryland researchers). a. If you have a body temperature of 99.00 °F, what is your percentile ...
*April 19, 2010*

**CJS 240**

what are any program-federal, state, or local that emplifies the concept of social structure, social process or social conflict theories? Or any references would be even better.
*April 17, 2010*

**cjs 250**

any references to the topic: can any target environment be perfectly stably or predictable?
*April 11, 2010*

**CJS 250**

can any target environment ever be perfectly stable or predictable? why or why not?
*April 11, 2010*

**Math 132**

It should be 5 over 6. Which equal to 1 over 2. Hope it help.
*April 5, 2010*

**Physics**

Two charged bodies exert a force of 0.415 N on each other. If they are moved so that they are one-third as far apart, what force is exerted?
*March 29, 2010*

**Physics**

Coulomb measured the deflection of sphere A when spheres A and B had equal charges and were a distance d apart. He then made the charge on B one-third the charge on A. How far apart would the two spheres then have had to be for A to have had the same deflection that it had ...
*March 29, 2010*

**physics**

If the average household uses electrical energy daily at the rate of 500. W, how much U-235 must undergo fission to supply this need for a year? (assume 200. MeV of energy are generated per fission and that the power plant is 46% efficient). 1. Energy used in Joules per year? ...
*March 16, 2010*

**physics**

Determine how much water would be present in a 10 tonne sample of lignite, has a moisture content of 65%, before crushing and drying. 10 tonnes is 10,000 kg.
*March 10, 2010*

**physics **

Wouldn't you take tan-1 of Y/X Y= 80 because you're heading north on a y-axis then 45 m would be your x-axis so tan-1 (80/45)??
*March 7, 2010*

**physics **

You walk 80 m to the north, then turn 60 degrees to your right and walk another 45 m. Determine the direction of your displacement vector. Express answer relative to east :)
*March 7, 2010*

**physics**

A boy throws a rock with an initial velocity of 2.47 m/s at 30.0 degrees above the horizontal. How long does it take for the rock to reach the maximum height of its trajectory?
*March 7, 2010*

**physics**

A plane flies directly from city A to B, which are separated by 2300mi. From A to B, the place flies into a 65mi/hr headwind. ON the return trip from A to B, the wind velocity is unchanged. The trip from B to A takes 44 min less than the trip from A to B. What is the airspeed...
*March 7, 2010*

**Calculus**

i got 7.7 for width and 9.5 for length? does this sound right
*March 1, 2010*

**Calculus**

A poster is to have an area of 170 in2 with 2 inch margins at the bottom and sides and a 3 inch margin at the top. What dimensions will give the largest printed area? (Give your answers correct to one decimal place.)
*March 1, 2010*

**physics**

the first excited state of the nucleus of uranium-235 is 0.051 MeV above the ground state. what is the wavelength of the photon emitted when the nucleus makes a transition to the ground state? (in meters)
*February 27, 2010*

**music**

c. Dissonance Many pieces today are very dissonant. In the olden days, composers were pressured to create music that was pleasing to the ear, so in the past, music was more melodious.
*February 12, 2010*

**health administration**

What is one strength you see in the current U.S. health care system? What is one weakness you see? List and describe one of the challenges facing the U.S. health care system.
*February 11, 2010*

**criminal justice**

1.Which option (front-end solutions, double bunking, or back-end solutions) do you feel is the most effective in our correctional system?
*February 11, 2010*

**Calculus**

Find the points of inflection of the curve below. Round the answers to three decimal places. (Hint: All three are in a straight line.) y= (1+x)/(1+x^2)
*February 8, 2010*

**Intermediate Accounting **

$85,313
*February 5, 2010*

**Physics**

Friction provides the force needed for a car to travel around a flat, circular race track. What is the maximum speed at which a car can safely travel if the radius of the track is 77.0 m and the coefficient of friction is 0.36?
*February 2, 2010*

**Math**

How many ways can 3 students be arranged in three chairs? I'm not really sure but I think that the answer will be 9 (nine), is that correct..?
*January 15, 2010*

**chemistry**

ANSWER is nf=3. i tried it
*January 15, 2010*

**Physics**

I just need help with part c. I know stopping takes longer but we have to explain why. A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 849 N. (a) As the elevator moves up, the scale reading increases to 912 N. Find ...
*January 5, 2010*

**Physics**

You are driving a 2590.0 kg car at a constant speed of 14.0 m/s along an icy, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. Your wheels lock, the tires begin skidding, and the car slides to a halt in a distance ...
*January 5, 2010*

**Physics**

If you use a horizontal force of 31.0 N to slide a 10.5 kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor? I tried 3.32 but it said that was wrong ?
*January 5, 2010*

**Physics**

if arnold strongman and suzie small each pull very hard on opposite ends of a massless rope in a tug-of-war the greater force on the rope is exerted by ? i think both the same
*January 5, 2010*

**Physics**

okay i changed it they didnt want a negative sign for some reason
*January 5, 2010*

**Physics**

Suppose a 68-kg boy and a 40-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
*January 5, 2010*

**Physics**

Okay the answer I am getting for this is 36666.67 but it said this was wrong? Maybe I am doing it wrong though I did 5500/.150 and it did say that the acceleration was right as a positive number
*January 5, 2010*

**Physics**

As a baseball is being caught, its speed goes from 27.5 m/s to 0.0 m/s in about 0.0050 s. The mass of the baseball is 0.150 kg. (a) What is the baseball's acceleration? 5500 m/s^2 (b) What are the magnitude and direction of the force acting on it? and is it in opposite in ...
*January 5, 2010*

**physics**

1. Three particles with charges of +11 mC each are placed at the vertices of an equilateral triangle with sides of 15.0 cm. What is the magnitude and direction of the net force on each particle? 2. A proton is released in an uniform electric field and it experiences a force of...
*January 4, 2010*

**Physics**

these are the two answers I got... 10 or 10.22
*January 3, 2010*

**Physics**

I don't understand this formula?
*January 3, 2010*

**Physics**

I found the first three parts of the question but I can't figure out part d. The instruments attached to a weather balloon in the figure below have a mass(m) of 5.5 kg. The balloon is released and exerts an upward force(F) of 109 N on the instruments. (a) What is the ...
*January 3, 2010*

**Physics**

its a web assign and i typed that answer in but it said it was wrong
*January 3, 2010*

**Physics**

so it should be -1.76 m/s^2
*January 3, 2010*

**Physics**

Suppose a 68-kg boy and a 40-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s^2, find the magnitude of the acceleration of the boy toward the girl.
*January 3, 2010*

**physics**

why should spare petrol for cars be carried in a metal rather than plastic container? Explain why the inside of the car is a safe place during a thunderstorm. calculate the charge on 4.0 * 10^20 protons.
*December 16, 2009*

**12th grade Physics**

charges of +1.000 C are located at the corners of a 45-45- right triangle which has a hypotenuse that is 1.414 m long. Determine the resultant force on the charge located at the vertex of the right angle.
*December 15, 2009*

**12th grade Physics**

the force between two charges is 20.0 N. if one charge is doubled, the other is tripled, and the distance between them is halved, calculate the resultant force between them.
*December 15, 2009*

**Physics**

A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 800 N and the angle between the two ropes is 20°. How hard must each player pull to drag the coach at a steady ...
*November 20, 2009*

**Physics**

A 2.6 N block is at rest on a horizontal surface. A 0.9 N upward force is applied to the block by means of attached vertical string. (a) What is the magnitude of the force of the block on the horizontal surface?
*November 20, 2009*

**Physics**

A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 800 N and the angle between the two ropes is 20°. How hard must each player pull to drag the coach at a steady ...
*November 20, 2009*

**Physics**

A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 800 N and the angle between the two ropes is 20°. How hard must each player pull to drag the coach at a steady ...
*November 19, 2009*

**Physics**

(a) Suppose you throw a football. At some instant, when the ball is in contact with your hand, your hand exerts a force of 100 N on the ball in the +x direction. What is the force of the ball on your hand?
*November 19, 2009*

**Physics**

A 2.6 N block is at rest on a horizontal surface. A 0.9 N upward force is applied to the block by means of attached vertical string. (a) What is the magnitude of the force of the block on the horizontal surface?
*November 19, 2009*

**spanish**

después de eso iré al término de autobuses y siguiente comeré una torta
*November 19, 2009*

**History**

to what extent was Hitler's rise to power due to personal appeal and ability?
*November 19, 2009*

**physics**

a 145g baseball is dropped from a tree 13.0m above the ground. with what is the velocity of the baseball at the ground after it falls 13.0m? B. If it actually hits the ground with a speed of 8.0o m/s, what is the average force of air resistance exerted on it?
*November 12, 2009*

**physics**

21.7 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 2.2 m/s How many joules of thermal energy are created due to friction as a kid slides down a slide?
*November 12, 2009*

**history**

What would be a good thesis statement for my intro paragraph? Effect and Evolution of African Americans in Minnesota Intro The first Great Migration occurred after the Civil War and after the 13th amendment was passed. With the passing of the 13th amendment, many African ...
*November 11, 2009*

**Physics**

A 3800 kg open railroad car coasts along with a constant speed of 8.60 m/s on a level track. Snow begins to fall vertically and fills the car at a rate of 3.50 kg/min. ignoring friction with the tracks what is the speed of the car after 90.0 minutes?
*November 11, 2009*

**physics**

A sports car of mass 950kg (including the driver) crosses the rounded top of a hill (radius = 95m) at 22m/s. Determine a) the normal force exerted by the road on the car, b) the normal force exerted by the car on the 72kg driver, and c) the car speed at which the normal force ...
*November 3, 2009*

**physics**

a .45kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3m on a frictionless horizontal surface. if the cord will break when the tension in it exceeds 75 N, what is the maximum speed the ball can have?
*November 3, 2009*

**PHYSICS**

so i did a = 1.25^/1.1 = 1.42 m/s^2 then F =ma = 25(1.42) = 35.5N is that right?
*November 3, 2009*

**PHYSICS**

a child sitting 1.10 m from the center of a merry go round moves with a speed of 1.25 m/s. calculate the centripetal acceleration of the child and the net horizontal force exerted on the child (mass = 25 kg).
*November 3, 2009*

**Physics**

Astronauts who spend long periods in outer space could be adversely affected by weightlessness. One way to simulate gravity is to shape the spaceship like a cylindrical shell that rotates, with the astronauts walking on the inside surface. Explain how this simulates gravity. ...
*November 1, 2009*

**physics**

Highway safety engineers build soft barriers such as the one shown in Figure 3-21, so that cars hitting them will slow down at a safe rate. A person wearing a safety belt can withstand an acceleration of -3.0 102 m/s2. How thick should barriers be to safely stop a car that ...
*October 27, 2009*

**English**

probably annotations or writing in the margins highlighting or underlining what you think is important
*October 27, 2009*

**physics**

what would part b be?
*October 27, 2009*

**physics**

A race car can be slowed with a constant acceleration of -14 m/s2. (a) If the car is going 44 m/s, how many meters will it travel before it stops? (b) How many meters will it take to stop a car going twice as fast?
*October 27, 2009*

**physics**

i tried squaring earth's radii and i tried multiplying it by 2
*October 26, 2009*

**physics**

calculate the force of Earth's gravity on a spacecraft 12,800 km (2 Earth radii) above Earth's surface if its mass is 1350 kg. i know the universal gravitation formula is Fg = G [(m1 m2)/ r^2] but im not getting anywhere near the multiply choice answers of: 14,470, ...
*October 26, 2009*

**physics**

sweet!! thank you =)
*October 26, 2009*

**physics**

ohh okay so the weight would be the same on the ground if its moving up at a constant speed?
*October 26, 2009*

**physics**

so the it would be the least on the way down, b/c your force, pushing on the scale is less. And it is greatest on the way up, since your force of push is stronger. And I would say in free fall it is the same as ground state?
*October 26, 2009*

**physics**

When will your apparent weight be greatest, as measured by a a scale in a moving elevator; when the elevators: (a) accel. downward (b) accel. upward (c) is in free fall (d) moves upward at a constant speed? In what case would you weight be the least? When would it be the same ...
*October 26, 2009*

** Physics**

a 75-kg petty theif wants to escape from a third story window. unfortunately a makeshift rope of sheets tied together can support a mass of only 58 kg. how might the theif use this rope? give a quantitative answer.
*October 24, 2009*

**Chemistry**

hopefully this helps... "Ether is the oxide of this base, and alcohol the hydrated oxide; that is, chemically regarded, the only difference between ether and alcohol is, that the latter contains one equivalent of water" albumen . conservation-us . org/ library/ ...
*October 24, 2009*

**12th grade Physics**

13000N 12000N 11000N 10000N
*October 24, 2009*

**12th grade Physics**

these are the answer choices though Problem 10 13000 N 12000 N 11000 N 10000 N
*October 24, 2009*

**math**

Round to the nearest ten thousand. Add and compare the answers. 16,250 + 58,351 = round first
*October 7, 2009*

**math**

Business and finance. In a bottling company, a machine can fill a 2-liter bottle in 0.5 seconds and move the next bottle into place in 0.1 second how many 2-L bottles can be filled by the machine in 2 hour?
*August 11, 2009*