Thursday

October 2, 2014

October 2, 2014

Total # Posts: 1,191

**math**

An unknown radioactive element decays into non-radioactive substances. In 100 days the radioactivity of a sample decreases by 64 percent. a)(a) What is the half-life of the element? half-life: b)How long will it take for a sample of 100 mg to decay to 51 mg? time needed:
*May 18, 2013*

**math**

If a number increases from 47 to 70.5 what is the rate of increase?
*May 15, 2013*

**math**

What is 7,000 decreased by 62%?
*May 15, 2013*

**chem**

the mass of the oxygen (o2) in a room is 0.0568 grams. How many oxygen molecules are in the room. 2 conversions are needed.
*May 15, 2013*

**world civilization**

which of these ancient civilizations survived, intact, until the twentieth century?
*May 9, 2013*

**algebra 2**

A dog kennel is to be constructed alongside a house using 60 m of fencing. Find the dimensions that will yield the maximum area. How do you solve this problem?
*May 8, 2013*

**chemistry**

a block of aluminum is placed in 10.0g of water. the initial temperature of the water is 22.0 degrees celcious and its final temperature is 27.0 degrees celcious. what is the amount of heat released by the block of aluminum in calories if it had an initial temperature of 48.0 ...
*April 30, 2013*

**physics**

Construct a 5th mode standing wave on a string that has an unknown mass hanging from one end. The distance between fixed ends of the string is 0.9 meters. If the wave speed on the 1.3 meter string is 216 meters per seconds and the string has a mass of 3 grams, what is the ...
*April 28, 2013*

**spanish**

Donde compraste esa falda cara?
*April 24, 2013*

**english**

What kind of fallacy are these 2 examples? 1. "Fresh fruits and veggies make life better." 2. "Fairway coffee is the essence of life itself."
*April 22, 2013*

**Physics**

A string fixed at both ends is 9.31 m long and has a mass of 0.125 kg. It is subjected to a tension of 100.0 N and set oscillating. (a) What is the speed of the waves on the string? m/s (b) What is the longest possible wavelength for a standing wave? m (c) Give the frequency ...
*April 16, 2013*

**Physics**

A projectile is fired vertically from Earth's surface with an initial speed v0. Neglecting air drag, how far above the surface of Earth will it go? (Use any variable or symbol stated above along with the following as necessary: ME for the mass of the Earth, rE for the ...
*April 11, 2013*

**tg3x-1=0**

Find solutions
*April 11, 2013*

**physics**

The mean diameters of X and Y, two planets in the same solar system, are 7.0 103 km and 1.4 104 km, respectively. The mass of X is 0.15 times the mass of Y. The value of g on Y is 8.6 m/s2. (a) What is the ratio of the mean density of X to that of Y (ρX / ρY)? (b) ...
*April 8, 2013*

**Physics**

Divide the negative charge by two. Since the total charge of the dipole is zero, you must have the two positive charges (which are the same), cancel out the sole negative charge. -15.9/2 = -7.95, and then flip the sign because the two sides are positive, so +7.95µC
*April 2, 2013*

**government?**

C. principle of popular sovereignty
*March 28, 2013*

**physics**

A man lifts various loads with the same lever. The distance of the applied force from the fulcrum is 2.00 m and the distance from the fulcrum to the load is 0.500 m. A graph of resistance force vs. effort force is shown. What is the mechanical advantage of the lever? What is ...
*March 20, 2013*

**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*

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