Saturday
August 30, 2014

Posts by Rachel


Total # Posts: 1,174

chemistry
A white solid was found in an unmarked bag. Describe an experiment that can be set up to determine if the solid is either MgSO4*10H2O or KCL*2H2O
March 4, 2013

PLEASE HELP ME FOR MATH
ln x = 6 ln^2 x SOLVE FOR x
March 3, 2013

Math
ln x = 6 ln^2 x solve for x
March 3, 2013

MATH HELP PLEASE!
(sqrt(ln(x)))/(ln sqrt(x))=6
March 3, 2013

MATH HELP PLEASE!
(sqrt(ln(x)))/(ln sqrt(x))=6
March 3, 2013

MATH HELP NEEDED PLEASE!
solve for x ((sqrt(lnx))/(ln(sqrt(x))))=6
February 27, 2013

Physics
You push a block of mass m against a horizontal spring, compressing the spring a distance x. Then you release the block, and the spring sends it sliding across a tabletop. It stops a distance d from where you release it. Let k be the spring constant. What is the coefficient of...
February 27, 2013

Physics
A 44 kg skier starts from rest at a height of H = 18 m above the end of the ski-jump ramp. As the skier leaves the ramp, his velocity makes an angle of 28° with the horizontal. Neglect the effects of air resistance and assume the ramp is frictionless. (a) What is the ...
February 27, 2013

Physics
In the figure below, a runaway truck with failed brakes is moving downgrade at 114 km/h just before the driver steers the truck travel up a frictionless emergency escape ramp with an inclination of 15°. The truck's mass is 5000 kg. (a) What minimum length L must the ...
February 27, 2013

Physics
In the figure below, a small block of mass m = 0.034 kg can slide along the frictionless loop-the-loop, with loop radius 8 cm. The block is released from rest at point P, at height h = 7R above the bottom of the loop. (For all parts, answer using g for the acceleration due to ...
February 27, 2013

Physics
What is the spring constant of a spring that stores 25 J of elastic potential energy when compressed by 6.0 cm from its relaxed length?
February 27, 2013

math
solve for x: x=9^(logbase9(5)+logbase9(9)) Note: Your answer must be exact and in simplest form
February 27, 2013

math
solve for x ((sqrt(lnx))/(ln(sqrt(x))))=6
February 27, 2013

math
For what value of x is the following true? log(x+4)=logx+log4
February 27, 2013

math
Find the solution of the exponential equation 7+(5^5x)=25 correct to at least four decimal places.
February 25, 2013

Math
Evaluate the expression, reducing to simplest form log(log1000^10000)= BLANK +logBLANK Your answers must be integers.
February 25, 2013

Physics
A block of mass m is dropped onto a relaxed spring constant k. The block becomes attached to the spring and compresses the spring a distance d before momentarily stopping. (Use any variable or symbol stated above along with the following as necessary: g for the acceleration of...
February 25, 2013

Physics
A proton (mass m = 1.67 10-27 kg) is being accelerated along a straight line at 3.1 1015 m/s2 in a machine. The proton has an initial speed of 2.4 107 m/s and travels 3.6 cm. (a) What is its speed? m/s (b) What is the increase in its kinetic energy? J
February 25, 2013

maths
-12 -(-8)
February 25, 2013

maths
find the length of a wire required to fence the rectangular field 200m x 150m and also find the cost of fencing at Rs.10/m?
February 24, 2013

Physics
A 1250 kg boat is traveling at 90 km/h when its engine is shut off. The magnitude of the frictional force fk between boat and water is proportional to the speed v of the boat. Thus, fk = 80v, where v is in meters per second and fk (the magnitude of the frictional force) is in ...
February 20, 2013

math
Use the Laws of logarithms to rewrite the expression log(base 2)(11x(x-9)) in a form with no logarithm of a product, quotient or power. After rewriting we will have: log(base 2)A+log(base 2)x+log(base 2)f(x) What is A and what is f(x)?
February 20, 2013

math
Use the Laws of logarithms to rewrite the expression ln(x^3 sqrt(y^4/z^10)) in a form with no logarithm of a product, quotient or power. After rewriting we have A ln(x)+B ln(x)+C ln(x) What is A B and C?
February 20, 2013

Physics
In Figure 5-66, a force F of magnitude 13 N is applied to a FedEx box of mass m2 = 1.0 kg. The force is directed up a plane tilted by θ = 37°. The box is connected by a cord to a UPS box of mass 3.0 kg on the floor. The floor, plane, and pulley are frictionless, and ...
February 20, 2013

Physics
n the figure below, the coefficient of kinetic friction between the block and inclined plane is 0.18 and angle θ = 55°. What is the block's acceleration (magnitude and direction) assuming the following conditions? (a) It is sliding down the slope. m/s2 down the ...
February 20, 2013

Physics
Calculate the magnitude of the drag force on a missile 63 cm in diameter cruising at 220 m/s at low altitude, where the density of air is 1.2 kg/m3. Assume C = 0.75.
February 20, 2013

Math
2410 / 2.3 = ?
February 19, 2013

math
Evaluate the expression: log(base4)4^6
February 19, 2013

Physics
A 1250 kg boat is traveling at 90 km/h when its engine is shut off. The magnitude of the frictional force fk between boat and water is proportional to the speed v of the boat. Thus, fk = 80v, where v is in meters per second and fk (the magnitude of the frictional force) is in ...
February 19, 2013

Physics
A loaded penguin sled weighing 60 N rests on a plane inclined at 20° to the horizontal. Between the sled and the plane the coefficient of static friction is 0.27, and the coefficient of kinetic friction is 0.13. (a) What is the minimum magnitude of the force F, parallel to...
February 19, 2013

Physics
A 1250 kg boat is traveling at 90 km/h when its engine is shut off. The magnitude of the frictional force fk between boat and water is proportional to the speed v of the boat. Thus, fk = 80v, where v is in meters per second and fk (the magnitude of the frictional force) is in ...
February 19, 2013

math
Find the exponential function f(x)=Ca^x whose graph goes through the points (0,3) and (2,12).
February 19, 2013

calculus
HAHA now i see mom
February 16, 2013

math algebra
The top of a rectangular dining room table is twice as long as it is wide. dimensions of the table if the area is 72 ft^2 the table is_____ft wide and ______ ft. long. PLEASE HELP
February 15, 2013

math algebra
The top of a rectangular dining room table is twice as long as it is wide. dimensions of the table if the area is 72 ft^2 the table is_____ft wide and ______ ft. long. PLEASE HELP
February 15, 2013

PHYSICS
A rifle is aimed horizontally at a target 31 m away. The bullet hits the target 1.3 cm below the aiming point. Neglect air resistance. (a) What is the bullet's time of flight? s (b) What is its muzzle velocity? m/s (in the bullet's initial horizontal direction)
February 12, 2013

math help please
the human body is 65% oxygen 18% carbon 10% hygrogen the rest is other elements what % is composed of ther elements
February 12, 2013

math
the hawks won 7 games lost 6 games and tied 2 games what percent of all the games did they win.
February 12, 2013

math
Each of two observers 475 feet apart measures the angle of elevation to the top of a tree that sits on the straight line between them. These angles are 55° and 59°, for observers A and B, respectively. How tall is the tree? How far is the base of its trunk from each ...
February 11, 2013

Physics
A lamp hangs vertically from a cord in a descending elevator with a constant deceleration a. If the tension in the cord is T0, answer the following. (Use any variable or symbol stated above along with the following as necessary: g.) (a) What is the lamp's mass? m = (b) ...
February 11, 2013

math conversion factors
1. Homework problems solved in 2 hours 30 minutes at a rate of 26 problems an hour.
February 5, 2013

Math conversion factors
1. Fruit smoothies sold in the month of march at the rate of 136 a day. 2. Fast food meals eaten is a month at a rate of 72 meals in a year. 3. Homework problems solved in 2 hours 30 minutes at a rate of 26 problems an hour.
February 5, 2013

math
One plane flies straight east at an altitude of 31,000 feet. A second plane is flying west at an altitude of 13,000 feet on a course that lies directly below that of the first plane and directly above the straight road from Thomasville to Johnsburg. As the first plane passes ...
February 5, 2013

math
One plane flies straight east at an altitude of 31,000 feet. A second plane is flying west at an altitude of 13,000 feet on a course that lies directly below that of the first plane and directly above the straight road from Thomasville to Johnsburg. As the first plane passes ...
February 5, 2013

math
One plane flies straight east at an altitude of 31,000 feet. A second plane is flying west at an altitude of 13,000 feet on a course that lies directly below that of the first plane and directly above the straight road from Thomasville to Johnsburg. As the first plane passes ...
February 5, 2013

Physics
A ball is shot from the ground into the air. At a height of 9.1 m, the velocity is observed to be v = (6.6 + 5.7 ) m/s, with horizontal and upward. (a) To what maximum height does the ball rise? m (b) What total horizontal distance does the ball travel? m (c) What is the ...
February 5, 2013

Physics
A centripetal-acceleration addict rides in uniform circular motion with period T = 4.30 s and radius r = 3.00 m. At one instant his acceleration is a = (4.00 m/s2)i + (-5.00 m/s2)j . At that instant, what are the following values? (a) v · a (b) r x a
February 4, 2013

Physics
In the figure below, a stone is projected at a cliff of height h with an initial speed of 46.0 m/s directed 60.0° above the horizontal. The stone strikes at A, 5.30 s after launching. (a) Find the height, h, of the cliff. m (b) Find the speed of the stone just before ...
February 4, 2013

Physics
A small ball rolls horizontally off the edge of a tabletop of height h. It strikes the floor a distance x horizontally away from the edge of the table. (Use any variable or symbol stated above along with the following as necessary: g.) (a) How long is the ball in the air? t...
February 4, 2013

Math
Peanuts sell for $3.00 per pound. Cashews sell for $6.00 per pound. How many pounds of cashews should be mixed with 12 pounds of peanuts to obtain a mixture that sells for $4.20 per pound?
January 31, 2013

calculus 2
An object falls off a 400-foot tower. With g=32ft/sec^2, as at the Earth’s surface, the object would hit the ground after 5 seconds. What would the acceleration due to gravity have to be to make it reach the ground in half the time?
January 31, 2013

calculus 2
An object thrown in the air on a planet in a distant galaxy is at height s(t) = -20t^2 +67t +42 feet at time t seconds after it is thrown. a) From what height was the object thrown? b) With what velocity was the object thrown? c) What is the acceleration due to gravity on this...
January 31, 2013

calculus 2
If a car goes from 0 to 100 mph in six seconds with constant acceleration, what is that acceleration?
January 31, 2013

calculus 2
A tomato is thrown upward from a bridge 23 m above the ground at 40 m/sec. find acceleration, velocity, and height of tomato at time t. How high does the tomato go, and when does it reach its highest point?
January 31, 2013

Physics
A person walks in the following pattern: 2.8 km north, then 2.7 km west, and finally 6.9 km south. Construct the vector diagram that represents this motion and from it judge how far and in what direction a bird would fly in a straight line from the same starting point to the ...
January 29, 2013

Physics
Vector A has a magnitude of 5.00 units, vector B has a magnitude of 9.00 units, and the dot product A·B has a value of 42. What is the angle between the directions of A and B?
January 29, 2013

calculus 2
A tomato is thrown upward from a bridge 23 m above the ground at 40 m/sec. Take the acceleration of gravity be equal to 9.8 m/s^2 (a) Give formulas for the acceleration, velocity, and height of the tomato at time t. (b) How high does the tomato go, and when does it reach its ...
January 28, 2013

Physics
A tomato is thrown upward from a bridge 23 m above the ground at 40 m/sec. Take the acceleration of gravity be equal to 9.8 m/s^2 (a) Give formulas for the acceleration, velocity, and height of the tomato at time t. (b) How high does the tomato go, and when does it reach its ...
January 28, 2013

Physics
At a certain time a particle had a speed of 17 m/s in the positive x direction, and 2.0 s later its speed was 32 m/s in the opposite direction. What is the magnitude of the average acceleration of the particle during this 2.0 s interval?
January 28, 2013

Physics
At a certain time a particle had a speed of 17 m/s in the positive x direction, and 2.0 s later its speed was 32 m/s in the opposite direction. What is the magnitude of the average acceleration of the particle during this 2.0 s interval?
January 28, 2013

Physics
287 degrees Celsius
January 23, 2013

Physics
A person walks in the following pattern: 2.8 km north, then 2.7 km west, and finally 6.9 km south. Construct the vector diagram that represents this motion and from it judge how far and in what direction a bird would fly in a straight line from the same starting point to the ...
January 20, 2013

Math
Using only measurements from the ground, determine the air speed of a passenger jet flying over the university. What methods should I use?
January 18, 2013

math
In 1980, the computer hard disk had a maximum capacity of 10 to the 7th power bytes. In 2000 computer hard disk capacity had increased to 10 to the 11th power bytes. By what factor had hard disk capacity increased between 1980 and 2000?
January 7, 2013

Trig..please help!
Two forces are pushing an ice shanty along the Ice. One has a magnitude of 330 lb in a direction due east. The other force has a magnitude of 110 lb in a direction 54 degrees east of north. What are the magnitude and direction of the resulant force?
January 6, 2013

algebra
10n+6=15n-9 In this equation what does n=
January 2, 2013

algebra
10n+6=15n-9 n=
January 2, 2013

math
200 milligrams equals how many ml
December 28, 2012

trigonometry
How do you draw only the top half of a circle in parametric mode on a TI-84 calculator?
December 18, 2012

Math
How do you find the domain and range from y=3x^3+4x^2-5?
December 17, 2012

Algebra 2
How do you find the domain and range from y=3x^3+4x^2-5?
December 17, 2012

calculus-can someone please help me with this ques
a- x-1 and x-5 both have odd mult. of 1 b- (1,0) and (5,0)
December 17, 2012

physics
5 kg of some liquid at 10 Celsius is mixed with 1 kg of the same liquid at 40 Celsius. What is the final equilibrium temperature? Ignore any heat flow with the containers and/or surroundings.
December 16, 2012

trigonometry
If you know the sine of a number, how do you find its cosine?
December 16, 2012

Algebra 2
D. 14.7
December 14, 2012

math
if bob uses x eggs for every 200 grams flour. How many eggs does he use if he uses 900 grams flour?
December 13, 2012

labor relations
to most effectively increase its percentage of the labor force in the 1990s, the union movement should increase its appeal to:
December 13, 2012

math
x=1 y=2 x=2 y=6 x=3 y=18 x=4 y=54 What is the rule?
December 10, 2012

History
Its either Africa or asia
December 5, 2012

History
Why do you think the Muslims were not able to conquer most of that continent??
December 5, 2012

History
How might the location of the Arabian peninsula have contributed to the rapid spread of Islam??
December 5, 2012

History
It is 3)*first successful hot air balloon flight
December 3, 2012

physics
I'm not sure how to deal with this problem (we're just starting the unit)... I need to find the average voltage induced into a 100 turn coil by a vertical wire when the wire's current drops from 602A to 0A in 0.01 seconds. ...if the coil was drawn as a circle on ...
December 2, 2012

Trigonometry
triangle ABC is isosceles, with AB=AC=15cm , and m<A = 150. What is the exact length of BC without using trigonmetry?
December 1, 2012

Trigonometry
Thank you. Could you explain in more detail please?
December 1, 2012

Trigonometry
What is sin(cos^-1 a) when 0 < cos^-1 a < 90
December 1, 2012

Physics
Why is it that if deceleration is doubled, distance is halved?
November 27, 2012

Geometry
Trapezoid WERI has legs WI and ER. If WERI is isosceles and if m<I= 110, find m<W, m<R, and m<E. How are you suppose to find the angle measures?
November 26, 2012

Corporate law
At a closing at 10 a.m. on May 3, 2005, X Corp. delivers $25,000,000 to the seller of a factory using $20,000,000 from Bank One secured by a mortgage on the property, and the attorney for X Corp. records its title to the property at the same time. At 2 p.m. the same day, X ...
November 21, 2012

Math
What are 3/8, 5/6, and 1/2 in order from least to greatest.
November 19, 2012

Trigonometry
Does it make a difference whether you translate a graph first and the scale the image, or scale the graph first and then translate the image?
November 18, 2012

World History
Hinduism evovle form the beliefs and practices of the ________, an early Indian society.
November 15, 2012

World History
Like Judaism, Christianity, and Islam,both Hinduism an Buddhism got their starts on the continent of ________.
November 15, 2012

World History
In India, the birthplace of Buddhism, curiously, Buddhism all but vanished, as it was ___________.
November 15, 2012

World History
there are no choices
November 15, 2012

World History
Generally peasants and the lower castes had a more positive reaction to the teachings of the Buddha, since Buddhists did not support the concept of a ________.
November 15, 2012

World History
The Middle Way charted a course between the extremes of the worldliness of Hinduism as some practiced it, and the _________ self-discipline that left people ill in mind and body.
November 15, 2012

geometry
Rick's 76ft times 50ft house sits on a plot of land as shown in the diagram below. If 1 bag of lawn food covers 5000 ft squared , how many bags should Rick buy to cover the lawn (shaded)?
November 14, 2012

math
What properties of light do the frequency and amplitude of light waves represent?
November 13, 2012

chemistry
how many atoms of each element are present in five formula units of calcium permanganate?
November 12, 2012

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