Friday
October 31, 2014

Posts by Anonymous


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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