Monday

January 16, 2017
Total # Posts: 8,195

**Geometry/Algebra/Calculus**

Why isn't the surface area of a sphere with radius r the following: 2*pi * (pi*r) That comes from the following flow of logic: Doesn't it makes sense to think of the surface area of the sphere with radius r as the the circumference of the semi-circle with radius r, pi*...

*January 26, 2014*

**Algebra**

Thanks Reiny

*January 25, 2014*

**Algebra**

A couple wishes to rent a car for one day while on vacation. Ford Auto Rental wants $35.00 per day and 14¢ per mile, while Chevrolet-For-A-Day wants $34.00 per day and 16¢ per mile. After how many miles would the price to rent the Chevrolet exceed the price to rent a...

*January 25, 2014*

**health**

the national weigth control registry found that those wno maintain aweigth loss reported improvememt in what

*January 25, 2014*

**Maths**

How many litres of water in a tank size 1.3m wide, 3.76m long and 0.73m deep

*January 24, 2014*

**math**

The side length, d, of a cube that contains a sphere depends on the radius, r, of a sphere. Assuming that the faces of the cube are tangent to the sphere, write the volume of the cube as a function of the radius of the sphere.

*January 24, 2014*

**Physical Science**

For everyone who is stupid answers are 1. A 2. D 3. D 4. B

*January 22, 2014*

**Physics**

so 81.34?

*January 21, 2014*

**Physics**

A rock is dropped from rest. How fast is it going after it has been falling for 8.3 s?

*January 21, 2014*

**physics**

A boy standing on top of a building throws a small ball from a height of H1 = 43.0 m. The ball leaves with a speed of 14.9 m/s, at an angle of 55.0 degrees from the horizontal, and lands on a building with a height of H2 = 14.0 m. Calculate for how long the ball is in the air...

*January 21, 2014*

**physics**

A fireman, 29.1 m away from a burning building, directs a stream of water from a ground level fire hose at an angle of 48.5° above the horizontal. If the speed is 51.6 m/s, at what height will the stream of water hit the building?

*January 21, 2014*

**Physics**

The figure shows a 7 kg block being pulled along a frictionless floor by a cord that applies a force of constant magnitude 20 N but with an angle θ(t) that varies with time. When angle θ = 29°, at what rate is the block's acceleration changing if (a)θ(t...

*January 21, 2014*

**Physics**

A 33.4 kg child, with a 3.05 kg backpack on his back, first stands on a sidewalk and then jumps up into the air. Find the force (positive up/negative down) on the sidewalk from the child when the child is (a) standing still and (b) in the air. Now find the net force (positive ...

*January 21, 2014*

**Physics**

If a current is flowing with a value of 5.9 A, how much electron charge passes any single point in 25 seconds? A) 1.9 x 1020 e

*January 21, 2014*

**science**

why u here?

*January 21, 2014*

**Physics**

Suppose that a binary star system consists of two stars of equal mass. They are observed to be separated by 380 million kilometers and take 9.0 Earth years to orbit about a point midway between them. What is the mass of each? ------------------------------- I've worked ...

*January 19, 2014*

**Science**

Yeah, blow it out your ass @blahh !

*January 19, 2014*

**Physics**

DISTANCE D = 2 * (# of laps) * (length of pool) D = 2*69*35 = 4830 m TOTAL DISPLACEMENT You're going by the swimmer's final position, so if he ends up at the same place he started, the net distance (or in other words, the displacement) is 0. AVERAGE VELOCITY ...

*January 19, 2014*

**Algebra**

A boat can go 20 miles against a current in the same times that it can go 60 miles with the current. The current is 4 miles per hour. Find the speed of the boat with no current.

*January 14, 2014*

**Physics Classical Mechanics Help ASAP**

if i make a simple conversion from PE to KE an then velocity it gives me a red cross :( but i don see ho to fit the bigger block into thepicture

*January 10, 2014*

**Physics**

Estimate the force a person must exert on a string attached to a 0.200 kg ball to make the ball revolve in a circle when the length of the string is 0.600 m. The ball makes 1.40 revolutions per second. Do not ignore the weight of the ball. In particular, find the magnitude of ...

*January 8, 2014*

**PRE-CAL**

That's all the problem says

*January 8, 2014*

**PRE-CAL**

A rectangle is inscribed in a right triangle with legs of length 3 and 4. Express the area A of the rectangle as a function of x.

*January 8, 2014*

**Math**

P and Q are two towns.The bearing of Q from P is 070 degrees.What is the bearing of P from Q?

*January 6, 2014*

**Math**

We call a natural number "odd looking" if all its digits are odd.How many 4-digit odd looking numbers are there?

*January 2, 2014*

**Physics**

A car with a mass of 1264 kg is coasting in neutral on a straight,level road. It slows down, and its speed as a function of time is given by the equation: v(t) = a − bt + ct2 Constant Value Units a 26.8 m/s b 0.310 m/s2 c 2.10*10^-3 m/s2 At a time of 36.0 s the speed, as...

*January 2, 2014*

**Physics**

the equation: v(t) = a âˆ’ bt + ct2

*January 2, 2014*

**Physics**

A car with a mass of 1264 kg is coasting in neutral on a straight,level road. It slows down, and its speed as a function of time is given by the equation: Constant Value Units a 26.8 m/s b 0.310 m/s2 c 2.10·10-3 m/s2 At a time of 36.0 s the speed, as given by the above ...

*January 2, 2014*

**Physics - please help!!**

A 395.0 g block is dropped onto a vertical spring with a spring constant k = 252.0 N/m. The block becomes attached to the spring, and the spring compresses 0.29 m before momentarily stopping. While the spring is being compressed, what work is done by the block's weight? ...

*December 30, 2013*

**Physics**

A 395.0 g block is dropped onto a vertical spring with a spring constant k = 252.0 N/m. The block becomes attached to the spring, and the spring compresses 0.29 m before momentarily stopping. While the spring is being compressed, what work is done by the block's weight? ...

*December 29, 2013*

**Math**

So would the answer be 6 or 3 then

*December 27, 2013*

**Math**

A line has y-intercept (0, 3) and is perpendicular to the line 2x + y = 3. Find the x-intercept of the line.

*December 27, 2013*

**Math**

Find the distance from the point (2, 3) to the line x − y = 5.

*December 27, 2013*

**Math**

f(x)=13x^2 -15x-14 g(x)=15x^3+14x^2-15x+12 find f(3) × f(10) + f(-7) × g(9)

*December 27, 2013*

**Science**

as do i

*December 27, 2013*

**Math**

one day?

*December 27, 2013*

**Science**

If Changing conditions lead to the decreased ocygen levels in the stream the carrying capacity of the stream for the trout will decreace oxygen levels in water is therefore a ________ with respect to the number of trout that a particular stream can support. Fill in the blank ...

*December 27, 2013*

**Science**

i don't know that one i just guesed lol can u help me with this one If Changing conditions lead to the decreased ocygen levels in the stream the carrying capacity of the stream for the trout will decreace oxygen levels in water is therefore a ________ with respect to the ...

*December 27, 2013*

**Science**

Please Help ME Plz

*December 27, 2013*

**Science**

If Changing conditions lead to the decreased ocygen levels in the stream the carrying capacity of the stream for the trout will decreace oxygen levels in water is therefore a ________ with respect to the number of trout that a particular stream can support. Fill in the blank ...

*December 27, 2013*

**Science**

thats what i said (in a 7th grade science test in conexus) lol

*December 27, 2013*

**Science**

I Hope Thanks for the help

*December 27, 2013*

**Science**

disturbance of an ecosystem by human activity often has negative effects on the number of species which is a measure of its ___________.?

*December 27, 2013*

**Physics**

A block of mass m = 5.2 kg is released from rest at a height of H = 4.0 m on a curved frictionless ramp. At the foot of the ramp is a spring whose spring constant is k = 192.0 N/m. What is the maximum compression of the spring, x? After the spring reaches its maximum ...

*December 25, 2013*

**Algebra 11th**

Activity 1: Graphing To fill an order for Sizzlin' Sauce sauces, you bought 1050 green peppers and 1200 hot chili peppers. • Write and graph a system of inequalities to represent how many pints of each kind of sauce you can make. Use the recipes below. • Select ...

*December 25, 2013*

**math**

He earned $300 which equals 6% Divide $300 by 6 to get 1% $50 is 1% , then multiply $50 by 100 to get 100% sales Answer $5000 in sales

*December 24, 2013*

**4th grade math**

that super easy just do 12*365+3=4383

*December 19, 2013*

**science help!!!!**

Disturbance of an ecosystem by human activity often has negative effects on the number of species, which is a measure of its __________________.

*December 17, 2013*

**science**

If changing conditions lead to decreased oxygen levels in the stream, the carrying capacity of the stream for the trout will decrease. Oxygen level in water is therefore a(n) _____________ with respect to the number of trout that a particular stream can support

*December 17, 2013*

**science**

i need the same help

*December 16, 2013*

**physics**

When the net force that acts on a hockey puck is 12 N, the puck accelerates at a rate of 48 m/s2. Determine the mass of the puck.

*December 12, 2013*

**seince**

According to the principle of supply and demand, the price you pay for a product is determined both by its availability and by consumer demand for the product. On the basis of this principle, which minerals do you think a higher value, iron-containing minerals or feldsparS? ...

*December 11, 2013*

**science urgent need help**

What is the independent variable? Select one option from the list below. 1 is the correct answer help me please .thanks Sue is setting up an experiment to test whether fly maggots select a dark or a brightly lit environment. She sets up a chamber in which there is a gradient ...

*December 11, 2013*

**government**

Your wrong sweetheart

*December 11, 2013*

**Science need help**

What is the independent variable? 1 is that the correct answer help plz Sue is setting up an experiment to test whether fly maggots select a dark or a brightly lit environment. She sets up a chamber in which there is a gradient in light intensity from one end (dark) to the ...

*December 11, 2013*

**science help plzzzzzzzzzzzzzzz?**

but its different then the other this one independent variable

*December 11, 2013*

**science help plzzzzzzzzzzzzzzz?**

Sue is setting up an experiment to test whether fly maggots select a dark or a brightly lit environment. She sets up a chamber in which there is a gradient in light intensity from one end (dark) to the other (brightly lit). The experimental hypothesis was “There will be a...

*December 11, 2013*

**Science need help**

Sue is setting up an experiment to test whether fly maggots select a dark or a brightly lit environment. She sets up a chamber in which there is a gradient in light intensity from one end (dark) to the other (brightly lit). The experimental hypothesis was “There will be a...

*December 10, 2013*

**Math- urgent**

2x = 28 x = 14

*December 10, 2013*

**calculus**

the tangent line to the curve y=x^2 at the point (a,a^2) passes through the point (2,1) find all possible values of a. Thank you so much!!

*December 9, 2013*

**science**

Thank you!!!

*December 9, 2013*

**science**

How is biodiversity related to human activities that use natural resources? A.biodiversity decreases as humans use natural resources wisely B.biodiversity decreases as humans limit there use of natural resources C.biodiversity increases as humans deplete natural resources D....

*December 9, 2013*

**science**

answers are all wrong the right ones are these: A.there will be fewer renewable resources B.more humans will populate the earth C.biodiversity naturally reduces over time D.more humans will recycle materials

*December 9, 2013*

**science**

which one help!!

*December 9, 2013*

**science**

which of the following will make it harder in the future to develop sustainable methods for humans using resources? A.biodiversity decreases as humans use natural resources wisely B.biodiversity decreases as humans limit there use of natural resources C.biodiversity increases ...

*December 9, 2013*

**science**

Is D right?

*December 9, 2013*

**science**

Ok thanks!!

*December 9, 2013*

**science**

Complete the following sentence with the best phrase below. Removing just one species from an ecosystem: A.would have no effect, because it is just one species of many B.would have little effect, unless it was a keystone species C.would have a negative effect, unless it was an...

*December 9, 2013*

**science**

I did! I am confused! Help! Please!

*December 9, 2013*

**science**

I don't know the answer help!

*December 9, 2013*

**science**

Which of the following could help reduce loss of biodiversity? A. increasing construction of tall buildings B. increasing farming operations C. increasing conservation measures. D. increasing the human ecological footprint

*December 9, 2013*

**science**

I think it is C. Am I correct?

*December 9, 2013*

**science**

Help!

*December 9, 2013*

**science**

Which one?

*December 9, 2013*

**science**

which of the following pairs of terms could be used to describe a bullfrog that is active at night and enters a state of complete inactivity during cold months? A. cooperation and hibernation B. aggression and circadian rhythm C.circadian rhythm and hibernation D. courtship ...

*December 9, 2013*

**STATISTICS HELP**

A student wishes to test the accuracy of the measuring jug she is using in an experiment. The label on the jug claims that it measures volume to an accuracy of plus or minus 5 cm3. The density of water is about 0.999 g cm−3, which means that 100 cm3 of water should have ...

*December 9, 2013*

**Advanced Functions/Precalculus**

1. The expression sinπ is equal to 0, while the expression 1/cscπ is undefined. Why is sinø=1/cscø still an identity? 2. Prove cos(ø + π/2)= - sin ø

*December 6, 2013*

**science**

can you provide the choices ????

*December 6, 2013*

**Chemistry**

An aqueous solution containing 17.1 g of an unknown molecular compound ( nonelectrolyte) in 105.0g of water was found to have a freezing point of -1.8 degrees Celsius. What is the molar mass of the unknown compound?

*December 6, 2013*

**Advanced Functions/Precalculus**

Trigonometry Questions 1. Using a compound angle formula, demonstrate that sin2π/3 is equivalent to sin π/3 2. The expression sinπ is equal to zero, while the expression 1/cscπ is undefined. Why is the identity sin(theta)=1/csc(theta) still an identity? 3. ...

*December 5, 2013*

**first year chem**

There are two naturally occurring isotopes of chlorine with ratios of 76% and 24%. One mole of PCl3 is made using a sample of isotopically pure chlorine gas (containing only one of the two isotopes). The product weighs 142 g. If chlorine gas containing the other isotope were ...

*December 5, 2013*

**Advanced Functions/Precalculus**

Trigonometry Questions 1. Using a compound angle formula, demonstrate that sin2π/3 is equivalent to sin π/3 2. The expression sinπ is equal to zero, while the expression 1/cscπ is undefined. Why is the identity sin(theta)=1/csc(theta) still an identity? 3. ...

*December 5, 2013*

**Advanced Functions/Precalculus**

thanks! i forgot to include the exponent. I re-typed them here: 2. Solve the equation 7sin^2x-4sin2x/cosx=-1 where 0≤x≤2π 3. Determine the exact value of cos2(theta) when tan(theta)=3/4 and π<theta<3π/2 4. The average number of customers, c, at...

*December 4, 2013*

**Advanced Functions/Precalculus**

Trigonometry Questions 1. Solve the equation sin2x+1=-2sinx for 0≤x≤2π 2. Solve the equation 7sin2x-4sin2x/cosx=-1 where 0≤x≤2π 3. Determine the exact value of cos2(theta) when tan(theta)=3/4 and π<theta<3π/2 4. The average ...

*December 4, 2013*

**Advanced Functions/Precalculus**

Trigonometry Questions 1.) Find the exaqct value of tan(11π/12) 2.) A linear trig equation involving cosx has a solution of π/6. Name three other possible solutions 3) Solve 10cosx=-7 where 0≤x≤2π

*December 4, 2013*

**Geometry**

How is the size of a TV measured? If we are comparing a 15-inch TV and a 30-inch TV, what is twice as big about the bigger TV?

*December 4, 2013*

**math**

Mrs. Smith had 1/2 of a pumpkin pie left over. She split the leftover pie evenly between her 3 children. What fraction of pie did each child get?

*December 3, 2013*

**Geometry**

To determine the relationship between miles and kilometers, if we use the conversion 39.37 inches= 1 meter, we find that 1 kilometer is approximately equal to 0.62 mile. What if we use the conversion 2.54 centimeters = 1 inch? How far apart are the answers (1 kilometer = x ...

*December 3, 2013*

**physics**

A child and sled with a combined mass of 53.0 kg slide down a frictionless hill that is 7.63 m high. If the sled starts from rest, what is its speed at the bottom of the hill?

*December 2, 2013*

**AP Physics**

A 67.0 kg diver steps off a diving board and drops straight down into the water. The water provides an upward average net force 1480 N. If the diver comes to rest 4.7 m below the water's surface, what is the total distance between the diving board and the diver's ...

*December 2, 2013*

**AP Physics**

A 67.0 kg diver steps off a diving board and drops straight down into the water. The water provides an upward average net force 1480 N. If the diver comes to rest 4.7 m below the water's surface, what is the total distance between the diving board and the diver's ...

*December 2, 2013*

**Physics Classical Mechanics**

anyone solved this ?????

*November 27, 2013*

**Algebra**

For the integers from 1 to 1000, how many multiples of 9 are also multiples of 6?

*November 26, 2013*

**physics**

A monatomic ideal gas is thermally insulated, so no heat can flow between it and its surroundings. Is it possible for the temperature of the gas to rise? If the temperature can rise, how does it rise?

*November 25, 2013*

**math**

For the integers from 1 to 1000, how many multiples of 9 are also multiples of 6?

*November 25, 2013*

**communicate**

consider an artifact that is prominently displayed by a friend or co-worker - either at home or in some other space. In 1-2 paragraphs, explain how this artifact has influenced your interpretation of this person's identity. Is your perception more positive or negative ...

*November 25, 2013*

**Calculus**

An observer stands at a point P, one unit away from a track. Two runners start at the point S in the figure and run along the track. One runner runs 2 times as fast as the other. Find the maximum value of the observer's angle of sight è between the runners. Thank ...

*November 23, 2013*

**Solar Energy**

Formula in first question: a)Pmpp < Voc X Isc Formula in second question: Load resistance = Vmpp/Impp

*November 23, 2013*