Friday

October 31, 2014

October 31, 2014

Total # Posts: 73,572

**Physics**

A traveler pulls on a suitcase strap at an angle 36 above the horizontal. If 555 J of work are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the tension in the strap?
*October 27, 2014*

**government**

1. "Find a local candidate: Name, Office he/she is seeking, political party" so i live in maryland so would a local one be Joni Ernst
*October 27, 2014*

**Pre-Calc/Trig**

oh okay thanks!
*October 27, 2014*

**Pre-Calc/Trig**

y=-x^2+5x+36 converting into intercept form is this the correct answer? y=(x+9)(x-4)
*October 27, 2014*

**health**

Oblique muscles are an example of which muscle feature? A. Direction of fibers B. Shape C. Size D. Location
*October 27, 2014*

**physics**

A traveler pulls on a suitcase strap at an angle 36 above the horizontal. If 555 J of work are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the tension in the strap?
*October 27, 2014*

**physics**

A traveler pulls on a suitcase strap at an angle 36 above the horizontal. If 555 J of work are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the tension in the strap?
*October 27, 2014*

**Pre-Calc/Trig**

Oh okay thank you, it's very clear now!
*October 27, 2014*

**Pre-Calc/Trig**

How?? I only know how to convert standard form functions into intercept form, but I do not understand how to do this. Convert the functions into standard form. 1.y=2(x-4)(x+3) 2.y-2=-3(x+4)^2
*October 27, 2014*

**physics**

A person is pulled to the right on a sled (total mass of 60.1 kg) across the surface of a frozen pond with a force of 62.9 Newtons so that they move with a constant velocity. What is the force of friction acting on the sled? Choose your coordinate system so that upward, and to...
*October 27, 2014*

**Pre-Calc/Trig**

I have looked this up, but still cant figure out what it is.. What is the projectile motion function?
*October 27, 2014*

**Algebra**

(2a - b)^3 = 8a^3 - 8a^2b + 4ab^2 - b^3 7x^3(2x + 3) = 14x^4 + 21x^3
*October 27, 2014*

**Science 8A Electromagnetism**

I did that experiment last year. The strength of a solenoid is how well it functions as a magnet. With one trial, put x number of loops and see how many paper clips (or any other metal object) are attracted. With the next trial, put y number of loops with the same metal object...
*October 27, 2014*

**Pre-Calc/Trig**

thank you!
*October 27, 2014*

**Pre-Calc/Trig**

I'm not sure on how to solve this. :/ A farmer wishes to enclose a pasture that is bordered on one side by a river (so one of the four sides won't require fencing). She has decided to create a rectangular shape for the area, and will use barbed wire to create the ...
*October 27, 2014*

**Algebra**

(2x + 5y)(3x^2 - 4xy + 2y^2) = 6x^3 - 8xy + 4xy^2 + 15x^2y - 20xy^2 + 10y^3
*October 27, 2014*

**algebra 2**

A skydiver jumps from an airplane at an altitude of 2,500 ft. He falls under the force of gravity until he opens his parachute at an altitude of 1,000 ft. Approximately how long does the jumper fall before he opens his chute?
*October 27, 2014*

**Calculus - PLEASE HELP!**

Thank you!
*October 27, 2014*

**Calculus**

A person whose height is 6 feet is walking away from the base of a streetlight along a straight path at 4 feet per second. If the height of the streetlight is 15 feet, what is the rate at which the person's shadow is lengthening?
*October 27, 2014*

**Calculus **

If y=sqrt (x^2+16), then d^2y/dx^2=?
*October 27, 2014*

**Calculus**

A sphere is increasing in volume at the rate of 3(pi) cm^3/sec. At what rate is the radius changing when the radius is 1/2 cm? The volume of a sphere is given by V=4/3(pi)r^2 A. pi cm/sec B. 3 cm/sec C. 2 cm/sec D. 1 cm/sec E. .5 cm/sec
*October 27, 2014*

**Calculus**

If (x+2y)dy/dx=2x-y, what is the value of d^2y/dx^2 at the point (3,0)? A. -10/3 B. 0 C. 2 D. 10/3 E. Undefined
*October 27, 2014*

**Calculus**

If f(x)=sqrt (x^2-4) and g(x)=3x-2, then the derivative of f(g(x)) at x=3 is A. 7/sqrt 5 B. 14/sqrt 5 C. 18/sqrt 5 D. 15/sqrt 21 E. 30/sqrt 21
*October 27, 2014*

**Calculus**

A sphere is increasing in volume at the rate of 3(pi) cm^3/sec. At what rate is the radius changing when the radius is 1/2 cm? The volume of a sphere is given by V=4/3(pi)r^3. A. pi cm/sec B. 3 cm/sec C. 2 cm/sec D. 1 cm/sec E. .5 cm/sec
*October 26, 2014*

**Calculus**

If y=sqrt (x^2+16), then d^2y/dx^2= A. 1 / (4(x^2+16)^3/2) B. 4(3x^2+16) C. x / ((x^2+16)^1/2) D. (2x^2+16) / ((x^2+16)^3/2) E. 16 / ((x^2+16)^3/2)
*October 26, 2014*

**Fractions Math**

Fiona and camila took a load of peaches to the farmers market. During the first hour , they sold 1/2 of the peaches plus 1/2 of a peach. In the second hour, they sold 1/3 of the remaining peaches plus 1/3 of a peach. In the third hour , they sold 1/4 of what was left and 3/4 ...
*October 26, 2014*

**Calculus**

Let f(x)=(2x+1)^3 and let g be the inverse function of f. Given f(0)=1, what is the value of g'(1)? A. -2/27 B. 1/54 C. 1/27 D. 1/6 E. 6
*October 26, 2014*

**Calculus**

If f(x)=sinx and g(x)=cosx, then the set for all x for which f'(x)=g'(x) is: A. Pi/4 + k(pi) B. Pi/2 + k(pi) C. 3pi/4 +k(pi) D. Pi/2 + 2k(pi) E. 3pi/2 + 2k(pi)
*October 26, 2014*

**Calculus**

If r is positive and increasing, for what value of r is the rate of the increase of r^3 twelve times that of r? A. Cubed root 4 B. 2 C. Cubed root 12 D. 2 sqrt 3 E. 6
*October 26, 2014*

**chemistry**

To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 3.4-L bulb, then filled it with the gas at 1.40atm and 25.0 ∘C and weighed it again. The difference in mass was 5.5g . Identify the gas.
*October 26, 2014*

**French**

How do you say "This is a form of exercise in French"?
*October 26, 2014*

**chemistry**

Nitride has a charge of -3, while sodium has a +1 charge. Thus, a molecule of sodium nitride would need three sodium ions to counteract the -3 charge. The molecule would be Na3N
*October 26, 2014*

**Calculus**

C = 2πr C' = 2π [This equals the rate at which the circumference is changing] A = πr^2 A' = 2πr [This equals the rate at which the area is changing] A' = 2C' 2πr = 2(2π) 2πr = 4π r = 4π/2π r = 2 So, the answer ...
*October 26, 2014*

**Calculus**

The radius of a circle is increasing. At a certain instant, the rate of increase in the area of the circle is numerically equal to twice the rate of increase in its circumference. What is the radius of the circle at that instant? A. 1/2 B. 1 C. Sqrt 2 D. 2 E. 4
*October 26, 2014*

**math**

F = 3K F = E + 15 K = E - 1 You can plug in either 3K or (E+15) for F, so now you've got this equation: 3K = E + 15 We know that Kevin = E - 1, so we plug that in for K: 3(E-1) = E + 15 3E - 3 = E + 15 2E = 18 E = 9 [So, Eileen must be 9] Plug in 9 for E to find Kevin'...
*October 26, 2014*

**PHYSICS (VECTOR)**

46 km/h [Horizontal] ---> \. | .\.| ..\v -474.8 km/h [Vertical] We're trying to find the angle in the top left corner of the triangle above. We already have the lengths of the two legs, so we'd do this using tan. Tan(x) = Opposite/Adjacent Tan(x) = (-474.8)/(46) = -...
*October 26, 2014*

**math**

P varies directly as the square root of q. P=8 when q =25 find p when q = 100
*October 26, 2014*

**physics**

Depends on what the acceleration and initial velocity are. Here's an equation that might help with that: Vf = Vo + at (Where vf = final velocity, vo = initial velocity, a = acceleration, and t = time) Assuming the car is starting from rest, this would be your equation: Vf...
*October 26, 2014*

**physics**

how much will the velocty of a car be in 24 seconds
*October 26, 2014*

**Math**

There's only one way to arrange 19 cubes such that a rectangle is formed, and that's by lining them all up in one 19-cube row. So, 1.
*October 26, 2014*

**physics**

x = t^4 - 6t^2 + 9t Take the derivative to get the velocity. v = 4t^2 - 12t + 9 Take the derivative again to get acceleration. a = 8t - 12 Now, let's shift to force formulas. F = ma If a = 0, F = 0. Therefore, the net force on the locomotive is equal to zero at the time ...
*October 26, 2014*

**physics**

The position of a toy locomotive moving on a straight track along the x-axis is given by the equation x = t4 − 6 t2 + 9 t , where x is in meters and t is in seconds. The net force on the locomotive is equal to zero when t is equal to
*October 26, 2014*

**physics**

A copper (Young's modulus 1.1 x 1011 N/m2) cylinder and a brass (Young's modulus 9.0 x 1010 N/m2) cylinder are stacked end to end, as in the drawing. Each cylinder has a radius of 0.14 cm. A compressive force of F = 4800 N is applied to the right end of the brass ...
*October 26, 2014*

**Chemistry**

Element X consists of two major isotopes with the following percent abundances and atomic masses: 35.0% and 85.0 amu; and 65.0% and 84.0 amu. Calculate the average atomic mass of element X.
*October 26, 2014*

**chemistry**

which unit is used to express the pressure of gas?
*October 26, 2014*

**French**

Yes, but is either of them correct?
*October 26, 2014*

**French**

Is it grammatically correct to say "Un prof enseigne les/des élèves"?
*October 26, 2014*

**Physics**

A solid wood door, 90.0 cm wide by 2.00 m tall has a mass of 35.0 kg. It is open and at rest. A small 500-g ball is thrown perpendicular to the door with a speed of 20.0 m/s and hits the door 60.0 cm from the hinged side. The ball rebounds with a speed of 16.0 m/s along the ...
*October 26, 2014*

**physics**

1- An elevator, when fully loaded, has a mass of 5500 kg. The elevator needs to accelerate anywhere from 2.7 m/s^2 [D] to 2.7 m/s^2 [U]. What is the maximum tension force that the elevator cable will need to support during normal use? can we use fnet principle here, so when ...
*October 26, 2014*

**physics**

A 83 kg person is hanging off the edge of a cliff, holding a rope. A 101 kg person is on the top of the cliff holding the other end of the rope. Find the minimum coefficient of static friction that would prevent the 83 kg person from falling.
*October 26, 2014*

**chemistry**

2.) If you pass 10.0mL of a 50.0mL solution of [Co(en)2Cl2]Cl that has been reduced with Zn through a cation exchange column, you will obtain a solution that has three H+ ions for every Co3+ ion that was originally present in the sample. These H+ ions are titrated with 0.10-M ...
*October 26, 2014*

**math**

all the seats in two sections of a movie theater are occupied. in one section there are 8 row with 18 seats in each row.
*October 26, 2014*

**Math**

Can someone please check these problems? Thank you! Solve each equation for the indicated value. 1. a-b=-c, for a I got a=-c+b 2. 4y+6x=12, for y I got y=-3/2x+3
*October 26, 2014*

**Chemistry**

The combustion of propane and oxygen produces carbon dioxide and water. What mass of water is produced from the combustion of 10.4g of propane, C3H8
*October 26, 2014*

**Math**

Thank you so much
*October 26, 2014*

**Math**

Find the exact interest on a loan of $32,400 at 7% annually for 30 days.
*October 26, 2014*

**social studies**

why did Deganawida think it was important to stop fighting?
*October 26, 2014*

**Chemistry**

Find the enthalpy change of the following reactions 2C+2H2O---> CO2+CH4 Using the following reactions with their change in H values. C+H2O---->CO+H2 H=+131.1kjmol-1 Co+H2O---->CO2+H2. H=-41.2kjmol-1 CH4+H2O--->CO+3H2 H=15.3
*October 26, 2014*

**Chemistry**

Find the enthalpy change of the following reactions 2C+2H2O---> CO2+CH4 Using the following reactions with their change in H values. C+H2O---->CO+H2 H=+131.1kjmol-1 Co+H2O---->CO2+H2. H=-41.2kjmol-1 CH4+H2O--->CO+3H2 H=15.3
*October 26, 2014*

**physics**

If an object is initially moving with a constant velocity of 20m/s towards positive x-axis and after 5 sec it changes its direction and moving at an angle of 30o with x-axis, find magnitude and direction of its acceleration.
*October 26, 2014*

**chemistry**

The reaction of 2.5 mol of O2 with 4.6 mol of C3H8 will produce ________ mol of H2O.
*October 26, 2014*

**Physics**

A cannon ball is fired horizontally with velocity of 15m from the top of a cliff 90m high.after how many seconds will it hit the foot of the cliff(a)time (b)at what distance from the foot of the cliff will it strike.
*October 25, 2014*

**Physical Education help**

The body's reaction to information is to send these to the brain. A. Neurons B. Impulses C. Dendrites D. Synapse Is the answer B? Thank you
*October 25, 2014*

**Physical Education help**

Thank you :)
*October 25, 2014*

**Physical Education help**

When diving into water, it is important to look before diving to avoid (blank) that could damage your nervous system. A. Deep water B. Underwater hazards C. Living creatures D. Water toys Is the answer B? Thanks
*October 25, 2014*

**Physical Education help**

Thank you Ms. Sue!
*October 25, 2014*

**Physical Education help**

The part of the brain that controls movement and balance is the A. Cerbrum B. Cerebellum C. Brain stem D. Frontal lobe Is the answer B? Thanks
*October 25, 2014*

**Economy, management, corporate governance**

BOB'S SUPERMARKET: COMPETING WITH THE BIG BOYS
*October 25, 2014*

**Math**

The data shows the total number of employee medical leave days taken for on-the-job accidents in the first six months of the year: 16, 7, 23, 9, 25, 16. Find the standard deviation.
*October 25, 2014*

**Science HELP!**

When diving into water, it is important to look before diving to avoid (blank)damage your nervous system. A. Deep water B. Underwater hazards C. living creatures D. Water toys Is the answer B? Thanks
*October 25, 2014*

**Science HELP!**

The part of the brain that controls movement and balance is the A. Cerbrum B. Cerebellum C. Brain stem D. Frontal lobe Is the answer B? Thanks
*October 25, 2014*

**math**

Thanks so much
*October 25, 2014*

**math**

8x-1=55
*October 25, 2014*

**Science HELP!**

The body's reaction to information is to send these to the brain. A. Neurons B. Impulses C. Dendrites D. Synapse Is the answer B? Thanks
*October 25, 2014*

**8th grade; English**

c b d c, tell me which ones are wrong and give me the answers to them
*October 25, 2014*

**Math**

Im still confused on how to solve these equations for the indicated value. 1. a-b=-c, for a 2. y=1/2x-10, for x
*October 25, 2014*

**Fundamental engineering principles**

htytyttruyewtuwuuw
*October 25, 2014*

**Fundamental engineering principles **

A car traveling at 108 km hr-1 deceleration uniformly from 108 km hr-1 to 72 km hr-1whilst covering 200m.it continues at this reduced for 150m before slowing down uniformly to rest over a distance of 225m. Draw the velocity-time diagram and use it to determine: (A)the total ...
*October 25, 2014*

**Calculus/pre-trig**

Write the formula for the discriminant. State the types of roots for a quadratic equation, explaining how the discriminant helps you determine the type.
*October 25, 2014*

**Math**

How do you solve each of these equations for the indicated value? I'm so confused on how to do it 1. a-b=-c, for a 2. 4y+6x=12, for y 3. y=1/2x-10, for x
*October 25, 2014*

**Math**

a) One mould forms a sculpture that is a composite object comprising a right cylinder with base diameter 15 in. and height 3 in., and a right cone with the same base diameter as the base of the cylinder and a height of 9 in. Determine the volume of the sculpture to the nearest...
*October 25, 2014*

**Precalculus**

A cruise ship sets a course N50°E from an island to a port on the mainland, which is c = 170 miles away. After moving through strong currents, the ship is off course at a position P that is N36°E and a = 90 miles from the island, as illustrated in the figure. (a) ...
*October 25, 2014*

**Math**

An igloo approximates a hemisphere, with an entrance tunnel that approximates half a right cylinder. The base of the igloo has diameter 4.0 m. The entrance is 0.8 m long; it has an external radius of 0.8 m and an internal radius of 0.7 m. Calculate the surface area of the ...
*October 25, 2014*

**Math**

f(x)=3x^2-x-2 If x=2, what is f(x)? What point is on the graph of f? For the first question, I got 8. But, I'm having trouble understanding the second question.
*October 25, 2014*

**Pre-Calc/Trig**

Yes, its correct.
*October 25, 2014*

**Math**

A solid sphere just fits inside a cube that has an edge length equal to the diameter of the sphere. The edge length of the cube is 5.8 cm. What is the volume of air in the cube to the nearest cubic centimetre?
*October 25, 2014*

**math**

1/64
*October 25, 2014*

**math**

i really dont know can you please tell me the correct one 4.1/16 5.1/4
*October 25, 2014*

**Precalculus**

39 + 21 + 39= 99
*October 25, 2014*

**Precalculus**

A reconnaissance airplane P, flying at 11,000 feet above a point R on the surface of the water, spots a submarine S at an angle of depression of β = 21° and a tanker T at an angle of depression of α = 39°, as shown in the figure. In addition, ∠SPT is ...
*October 25, 2014*

**Pre-Calc/Trig**

oh wait, nvm
*October 25, 2014*

**Pre-Calc/Trig**

oh okay thank you, do i plug them in now or leave it at that?
*October 25, 2014*

**Precalculus**

The rectangular box shown in the figure has dimensions 10" × 7" × 3" (a = 10, b = 7, c = 3). Approximate the angle θ formed by a diagonal of the base and a diagonal of the 7" × 3" side. (Round your answer to two decimal places.)
*October 25, 2014*

**Lauren**

Let f(x) = 3+4x-x^{3}. Find the open intervals on which f is increasing (decreasing). Then determine the x-coordinates of all relative maxima (minima). 1. f is increasing on the intervals 2. f is decreasing on the intervals
*October 25, 2014*

**math**

Let f(x) = 3+4x-x^{3}. Find the open intervals on which f is increasing (decreasing). Then determine the x-coordinates of all relative maxima (minima). 1. f is increasing on the intervals? 2. f is decreasing on the intervals?
*October 25, 2014*

**Precalculus**

An airplane flies 180 miles from point A in the direction 135° and then travels in the direction 240° for 90 miles. Approximately how far is the airplane from A? (Round your answer to the nearest whole number.)
*October 25, 2014*

**8th grade language arts**

Can you help me with it
*October 25, 2014*

**8th grade language arts**

i will tell u what i got and you tell me if it is correct a b c d
*October 25, 2014*

**physics**

A 20 g fridge magnet is being held onto the fridge by a 0.9 N force. coefficient of kinetic friction is 0.3 . (please include an FBD when giving the solutions) a. calculate the friction acting on the magnet. b. calculate the weight of the magnet c.the acceleration of the ...
*October 25, 2014*

**statistics**

For a normal distribution (symmetrical), a value that is two standard deviations below the mean would be closer to which of the following? Select one: a. 89th percentile b. Third Quartile c. Third percentile d. Median
*October 25, 2014*

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