# Joy

Popular questions and responses by Joy-
## Chemistry

Express the concentration of a 0.0510 M aqueous solution of fluoride, F-, in mass percentage and in parts per million. Assume the desnity of the solution is 1.00 g/mL Since, we're assuming the density I think that also means were assuming the volume.. but

*asked on February 19, 2012* -
## math

if you made a stack of nickels a 100 inches tall, how many nickels would you need

*asked on February 6, 2013* -
## math

Accoring to math teachers, what did the acorn say when it grew up? there is ten questions and 15 boxes

*asked on September 8, 2009* -
## Physics

The figure below shows a box of dirty money (mass m1 = 4.0 kg) on a frictionless plane inclined at angle θ1 = 35°. The box is connected via a cord of negligible mass to a box of laundered money (mass m2 = 2.0 kg) on a frictionless plane inclined at angle

*asked on February 27, 2018* -
## physics

A 0.060 kg tennis ball, moving with a speed 2.50 m/s, collides head on with a 0.090kg ball initially moving away from it at a speed of 1.15 m/s. Assuming a perfectly elastic collision, what are the speed and direction of each ball after the collision?

*asked on August 19, 2010* -
## Physical science

which liquid evaporates fastest between water , ethanol , nail polish remover and methylated spirits

*asked on March 25, 2015* -
## Chemistry

A solution is made by mixing 42.0 mL of ethanol, C2H6O, and 58.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 C in torr? Values at 20C ethanol density: 0.789 g/mL & vapor pressure (torr): 43.9 torr water: denisty:

*asked on February 19, 2012* -
## physic

Approaching one of the many sharp horizontal turns in the Monaco Grand Prix, an experienced Formula-1 driver slows down from 125 km/h to 53.0 km/h while rounding the bend in 12.0 s. If the driver continues to decelerate at this same rate and the radius of

*asked on January 31, 2018* -
## physic

Two blocks are connected by a rope that passes over a massless and frictionless pulley as shown in the figure below. Given that m1 = 18.04 kg and m2 = 10.57 kg, determine the magnitudes of the tension in the rope and the blocks' acceleration. T = N a =

*asked on February 5, 2018* -
## physics

A ballistic pendulum is used to measure the speed of bullets. It comprises a heavy block of wood of mass M suspended by two long cords. A bullet of mass m is fired into the block in the horizontal direction. The block, with the bullet embedded in it,

*asked on March 26, 2018* -
## GEOMETRY MIDPOINT FORMULA steve how did this hapn

If a line is extended from A (2,3) through B ( -2, 0 ) to a point so that AC = 4ab Find the coordinates of C Please help thanks so much GEOMETRY MIDPOINT FORMULA - Steve, Thursday, January 30, 2014 at 11:58am B-A = (-4,-3) C-A = 4(B-A) = (-16,-12) C =

*asked on January 31, 2014* -
## physic

During a visit to New York City, Lil decides to estimate the height of the Empire State Building (see figure below). She measures the angle θ of elevation of the spire atop the building as 17°. After walking x = 9.28 ✕ 102 ft closer to the iconic

*asked on January 18, 2018* -
## Social Studies

What is the importance of modern businesses to Georgia? Choose 2. A) They provide jobs. * B) They are always found in shopping centers. C) They drive Georgia's economy.* D) They are always in retail. I chose A & C.

*asked on May 14, 2017* -
## Mathematics

A T-bill with face value of $10,000 and 96 days to maturity is selling at a bank discount ask yield of 4.3%. A. What is the price of the bill? (use 360 days a year) B. what is its bond equivalent yield? A. .043 * (96/360) = .011 .011 * (1-.043) = $9,890 B.

*asked on August 23, 2013* -
## physic

A golfer hits his approach shot at an angle of θ = 52.8°, giving the ball an initial speed of v0 = 37.0 m/s (see figure below). The ball lands on the elevated green, yf = 5.3 m above the initial position near the hole, and stops immediately. (a) How much

*asked on January 31, 2018* -
## Social Studies

What was the purpose of the Freedman's Bureau?

*asked on November 27, 2016* -
## physic

The figure shows the y-position (in blue) of a particle versus time. (a) What is the average velocity of the particle during the time interval t = 1.50 s to t = 4.50 s? (Express your answer in vector form.) Incorrect: Your answer is incorrect.

*asked on January 21, 2018* -
## Chemistry

if the mole fractionof sulfuric acid (H2SO4) in an aqueous solitioin is 0.325, what is the percent by mass of H2SO4?

*asked on March 3, 2013* -
## physic

A block with mass m1 hangs from a rope that is extended over an ideal pulley and attached to a second block with mass m2 that sits on a ledge. The second block is also connected to a third block with mass m3 by a second rope that hangs over a second ideal

*asked on February 7, 2018* -
## Physics

A golf ball is hit with a velocity of 24.5 m/s at 35.0 degrees above the horizontal. Find a) the range of the ball, and b) the maximum height of the ball

*asked on October 10, 2011* -
## physics

A solid cylinder of mass m and radius R rolls down a parabolic path PQR from height without slipping (assume R ≪ H) as shown in the figure below. Path PQ is rough (and so the cylinder will roll on that path), whereas path QR is smooth, or frictionless

*asked on April 14, 2018* -
## physics

[20 pts] A 2.00 kg block is pushed against a spring with negligible mass and force constant k = 400 N/m, compressing it 0.220 m. When the block is released, it moves along a frictionless, horizontal surface and then up a frictionless incline with slope 37

*asked on August 19, 2010* -
## Solid Mensuration

The diagram is formed from 6 identical closed -packed circles. If the height of the figure is 2 feet, find the radius of each circle in inches.

*asked on April 30, 2016* -
## physic

Vector A,with a magnitude of 23 units, points in the positive x direction. Adding vector B to vector A yields a resultant vector that points in the negative x direction with a magnitude of 8 units. What are the magnitude and direction of vector B?

*asked on January 25, 2018* -
## physic

A circus performer throws an apple toward a hoop held by a performer on a platform (see figure below). The thrower aims for the hoop and throws with a speed of 22 m/s. At the exact moment the thrower releases the apple, the other performer drops the hoop.

*asked on February 1, 2018* -
## biology /check please

(stimulus v. response)? Which of the following is a stimulus, which is a response? Thanks 1)the recess bell ringing in an elementary school 2)your mouth watering at the sight of food on a plate 3)a sudden drop in air temperature 4) a flu virus entering

*asked on December 21, 2010* -
## Physics

How many days does it take for a perfect blackbody cube (0.0100m on a side, 30.0 degree C)to radiate the same amount of energy that a one-hundred-watt light bulb uses in one hour? I got no idea to do it. Please give me some hints!!!Thanks!!!

*asked on February 21, 2008* -
## physics

A sled and rider have a total mass of 58.4 kg. They are on a snowy hill accelerating at 0.4g. The coefficient of kinetic friction between the sled and the snow is 0.17. What is the angle of the hill's slope measured upward from the horizontal? You may find

*asked on February 12, 2018* -
## maths

An ap has 15th and a common difference of -3 find the first and last term. If it. Sum is -120

*asked on October 12, 2016* -
## english

When naval engagements occur they are carried on at such great---------- that the intervention of mist may obscure the contestants from each other 1 extremes ,2 risk , 3 ranges 4,pace, 5 disadvantegc

*asked on May 14, 2013* -
## physics

3)A baseball player holds a 36oz bat (weight = 10N) with one hand at the point O (Figure below). The bat is in equilibrium. The weight of the bat acts along a line 60cm (or 0.6m) to the right of O. Determine the force and torque exerted on the bat by the

*asked on April 22, 2018* -
## physics

If α = 40°, β = 60°, and M = 4.0 kg, determine the tension in string 1 & 2. -------/ / 1 /2 / . . . Blockmass Alpha is on the top left angle and Beta is on the top right angle.

*asked on March 2, 2018* -
## physic

A circus performer stands on a platform and throws an apple from a height of 49 m above the ground with an initial velocity v0 as shown in the figure below. A second, blindfolded performer must catch the apple. If v0 = 30 m/s, how far from the end of the

*asked on January 30, 2018* -
## PHYSIC

A bullet is fired in a horizontal direction with a muzzle velocity of 300m\s in the absence of air resistance,how far will it have dropped in travelling a horizontal distance of (a)20m (b)40m (c)60m (d)how far will it drop in one second

*asked on October 22, 2016* -
## physic

A circus performer stands on a platform and throws an apple from a height of 50 m above the ground with an initial velocity v0 as shown in the figure below. A second, blindfolded performer must catch the apple. If v0 = 21 m/s, how far from the end of the

*asked on January 30, 2018* -
## physics

An electric motor exerts a constant torque of 10N⋅m to the shaft of a grindstone with mass 16kg and radius 0.5m. If the system starts from rest, find (a) the rotational kinetic energy of the grindstone after 8s, (b) the work done by the motor during this

*asked on April 22, 2018* -
## physic

An arrow is fired with initial velocity v0 at an angle θ from the top of battlements, a height h above the ground. (Assume θ is measured above the horizontal.) (a) In terms of h, v0, θ, and g, what is the time at which the arrow reaches its maximum

*asked on January 30, 2018* -
## physics

A 4-m wooden platform weighing 160 N is suspended from the roof of a house by ropes attached to its ends. A painter weighing 640 N stands 1.2 m from the left-hand end of the platform. Find the tension in each of the ropes

*asked on March 3, 2012* -
## Finance/Accounting

Milwaukee Surgical Supplies, Inc, sells on terms of 3/10, net 30. Gross sales for the year are $1,200,000 and the collections department estimates that 30 percent of the customers pay on the tenth day and take discounts, 40 percent pay on the thirtieth

*asked on October 2, 2008* -
## math

A construction crew has just finished building a road. The road is 10 kilometers long. If the crew worked for 4 2/3 days, how many kilometers of road did they build each day? (Assume they built the same amount each day.) Write your answer as a mixed number

*asked on October 3, 2015* -
## physic

The figure below shows a box of dirty money (mass m1 = 4.0 kg) on a frictionless plane inclined at angle θ1 = 35°. The box is connected via a cord of negligible mass to a box of laundered money (mass m2 = 2.0 kg) on a frictionless plane inclined at angle

*asked on February 27, 2018* -
## physics

A uniform ladder of length L rests against a smooth, vertical wall as shown in the figure below. If the mass of the ladder is m and the coefficient of static friction between the ladder and the ground is muks=0.4, ﬁnd the minimum angle theta at which the

*asked on April 22, 2018* -
## Chemistry

The solubility of a gas at 7.0 atm of pressure is 0.52 g/L . How many grams of the gas would be disolved per 1.0 L if the pressure increased 40.0 percent?

*asked on March 4, 2013* -
## physics

A uniform horizontal beam with a length of 8m and a weight of 200N is attached to a wall by a pin connection. Its far end is supported by a cable that makes an angle of 53° with the beam (Figure below). If a 600N person stands 2m from the wall, ﬁnd the

*asked on April 23, 2018* -
## physic

An electronic line judge camera captures the impact of a 57.0-g tennis ball traveling at 32.8 m/s with the side line of a tennis court. The ball rebounds with a speed of 21.2 m/s and is seen to be in contact with the ground for 4.08 ms. What is the

*asked on January 23, 2018* -
## 8th Grade Algebra: Answer Check

Find the length of the 3rd side of each right triangle. 1. 8^2+15^2=c^2 Answer: c=17 2. 5^2+b^2=13^2 Answer: b=12 3. 9^2+13^2=c^2 Answer: c~15.81 Simplify. Assume that all variables are nonnegative. { this means square root 4. {12 Answer: 2{3 5. 2{75

*asked on January 20, 2009* -
## SCIENCE

I HAVE A DIAMOND BRACELET THAT HAS THE MARKINGS OF JAFA STAMPED ON THE INSIDE OF IT ABOVE 05TW MEANING THE TOTAL WEIGHT. WHAT DOES THE JAFA STAND FOR?

*asked on April 16, 2009* -
## physic

A sounding rocket, launched vertically upward with an initial speed of 79.0 m/s, accelerates away from the launch pad at 5.70 m/s2. The rocket exhausts its fuel, and its engine shuts down at an altitude of 1.15 km, after which it moves freely under the

*asked on January 23, 2018* -
## physics

The period of oscillation of a near-Earth satellite (neglecting atmospheric effects) is 84.3 min. What is the period of a near-Moon satellite? (R⊕= 6.37 × 10^6 m; RMoon= 1.74 × 10^6 m; m⊕ = 5.98 × 10^24 kg; mMoon = 7.36 × 10^22 kg.)

*asked on March 1, 2018* -
## physics

Harry Potter decides to take Pottery 101 as an elective to satisfy his arts requirement at Hogwarts. He sets some clay (m = 4.00 kg) on the edge of a pottery wheel (r = 0.730 m), which is initially motionless. He then begins to rotate the wheel with a

*asked on February 8, 2018* -
## physic

A student takes the elevator up to the fourth floor to see her favorite physics instructor. She stands on the floor of the elevator, which is horizontal. Both the student and the elevator are solid objects, and they both accelerate upward at 5.15 m/s2.

*asked on February 7, 2018* -
## Chemistry

What is wrong with the names 2-ethyl-4 and 4-dimethylpentane?

*asked on September 3, 2012* -
## Algebra

A company has determined that when x hundred dulcimers are built, the average cost per dulcimer can be estimated by C(x)=0.2x(squared)−2.6x+9.950, where C(x) is in hundreds of dollars. What is the minimum average cost per dulcimer and how

*asked on April 15, 2018* -
## math

a pottery maker can make 24 vases in 8 days. If the pottery maker works 6 hours each day, how long does it take to make 1 vase. A 2 hours B 3hr C 4hrs D 6 hours

*asked on April 22, 2014* -
## physics

A race car travels 40 m/s around a banked (45° with the horizontal) circular (radius = 0.20 km) track. What is the magnitude of the resultant force on the 80-kg driver of this car?

*asked on February 26, 2018* -
## Chemistry

What is the mass of carbon dioxide if 100 grams of methane is oxidized to carbon dioxide and water?

*asked on April 27, 2011* -
## Physics (Kinematics)

A ball is thrown 83.3 m upward and then falls back to earth.Neglecting air resistance, how long will it be in the air? The acceleration of gravity is 9.8 m/s2 . Answer in units of s

*asked on October 6, 2012* -
## Geometry

Over July 16, 1882, a massive thunderstorm over Dubuque, Iowa, produced huge hailstones. The diameter of some of the hailstones was 17 inches. Ice weighs about 0.033 lb/in^3. What was the approximate weight of these hailstones to the nearest pound? The

*asked on March 4, 2010* -
## physic

A firecracker explodes into four equal pieces (see figure below). Given the magnitude and direction of the velocity for each piece and the coordinate system shown, determine the x and y velocity components for each piece of the firecracker. (Assume the

*asked on January 26, 2018* -
## Chemistry

Any one there who would help me with my pr0blem!Please help me,tnx! What is the mass of carbon dioxide if 100 grams of methane is oxidized to carbon dioxide and water?

*asked on April 28, 2011* -
## Chemistry

What is the mass of carbon dioxide if 100 grams of methane is oxidized to carbon dioxide and water?

*asked on April 28, 2011* -
## life orientation

identify and explain in five inhumane farming practices

*asked on August 1, 2018* -
## physic

Three vectors are shown in the figure below, but they are not drawn to scale. The sum of the three vectors is R = F1 + F2 + F3. If Ry = 0 and F2 = 0.2F3,find Rx in terms of F1. the angle for F1 is 30 degree

*asked on January 28, 2018* -
## physic

A circus performer throws an apple toward a hoop held by a performer on a platform (see figure below). The thrower aims for the hoop and throws with a speed of 28 m/s. At the exact moment the thrower releases the apple, the other performer drops the hoop.

*asked on January 30, 2018* -
## Accounting

Genentech, Inc. is a California-based biotech pioneer recently acquired by Swiss pharmaceutical giant Roche Holding AG. Roche paid $46.8 billion in cash for the 44 percent of Genentech it did not already own, implying a market value of over $100 billion

*asked on November 2, 2013* -
## geometry

A pyramid has a square base with sides length of b. The height of the pyramid is h. If the pyramid is enlarged by doubling the height while leaving the base unchanged, what is the effect on the volume of the pyramid? Will the volume triple? These are my

*asked on May 25, 2011* -
## physics

A 0.25 kg skeet (clay target) is fired at an angle of 30 degrees to the horizon with a speed of 25 m/s. When it reaches the maximum height, it is hit from below by a 15 g pellet travelling upward at a speed of 200 m/s. The pellet is embedded in the skeet.

*asked on August 19, 2010* -
## physics

The wave function (x,t)=(0.03m)sin(2.2x-3.5t) is for a harmonic wave on a string. (a) In what direction does this wave travel and what is its speed? (b) Find the wavelength, frequency, and period of this wave. (c) What is the maximum displacement of any

*asked on April 25, 2018* -
## physic

Three vectors are shown in the figure below, but they are not drawn to scale. The sum of the three vectors is R = F1 + F2 + F3. If Ry = 0 and F2 = 0.2F3, find Rx in terms of F1. the Answer Keyis 0.327.can somebody show me how to get to the answer key. I

*asked on January 28, 2018* -
## physics

A box of mass m rests on a rough, horizontal surface with a coefficient of static friction μs. If a force F with arrowp is applied to the box at an angle θ as shown, what is the minimum value of θ for which the box will not move regardless of the

*asked on February 9, 2018* -
## Psychology (statistics)

In an English class last semester, Foofy earned a 76 1X 5 85, SX 5 10). Her friend, Bubbles, in a different class, earned a 60 1X 5 50, SX 5 4). Should Foofy be bragging about how much better she did? Why?

*asked on February 2, 2014* -
## Organic Chemistry

When 2-methylpropene is bubbled into dilute sulfuric acid at room temperature, it appears to dissolve. What new substance has been formed?

*asked on January 7, 2009* -
## physic

A 2.26 kg object is subjected to three forces that give it an acceleration a= −(8m/s^2)i + (6m/s^2)j. If two of the three forces are F1 = (36.2 N)i + (18N)j and F2 = −(12N)i + (8N)j,find the third force.

*asked on February 27, 2018* -
## english

root word :lantry The definition of root is: worship A word using this root is: autolantry the definition of autolantry ,I cant find it ,can you help me look it up the definition or find another word using the root .thank you

*asked on November 18, 2010* -
## Chemistry

What volume of distilled water should be added to 400cm3 of 2.0mol/dm 3 H2SO4 to obtain 0.20mol/dm3 of solution

*asked on August 2, 2018* -
## physics

A black hole is an object with mass, but no spatial extent. It truly is a particle. A black hole may form from a dead star. Such a black hole has a mass several times the mass of the Sun. Imagine a black hole whose mass is eighty-two times the mass of the

*asked on February 16, 2018* -
## Math

A paper cone has a base diameter of 8cm and a height of 3cm(a) use Pythagoras theorem to calculate it's slant height (b)if the cone is cut and opened out into the sector of a circle what is the angel of the sector

*asked on May 30, 2016* -
## Physics

A car is traveling around a horizontal circular track with radius r = 240 m at a constant speed v = 25 m/s as shown. The angle èA = 34° above the x axis, and the angle èB = 65° below the x axis. I found the car's acceleration to be 2.6 m/s^2 (a=v^2/r).

*asked on September 11, 2010* -
## Statistics

In a normal distribution of scores, four participants obtained the following deviation scores: 11, 22, 15, and 210. (a) Which score reflects the highest raw score? (b) Which score reflects the lowest raw score? (c) Rank-order the deviation scores in terms

*asked on February 2, 2014* -
## Physics

A particle starts from rest and moves with a constant acceleration of 0.5m/s2. Calculate the time taken by the particle to cover a distance of 25m.

*asked on October 30, 2018* -
## physic

A golfer hits his approach shot at an angle of θ = 52.8°, giving the ball an initial speed of v0 = 37.0 m/s (see figure below). The ball lands on the elevated green, yf = 5.3 m above the initial position near the hole, and stops immediately.

*asked on January 31, 2018* -
## Physics

A piece of copper ball of mass 20g at 200°c is placed in a copper calomiter of mass 60g containing 50g of water at 30°c ignoring heat losses.calculate the final steady temperature of the mixture

*asked on June 11, 2017* -
## physics

A box of mass m rests on a rough, horizontal surface with a coefficient of static friction μs. If a force Fp arrow is applied to the box at an angle θ as shown, what is the minimum value of θ for which the box will not move regardless of the magnitude

*asked on February 15, 2018* -
## Economics

This problem is based on the specific factors model. Consider the economy of the Shire that produces cereals and swords. Each industry employs Hobbits, but land is specific to the production of cereals, and metal is a specific factor in the sword industry.

*asked on October 3, 2013* -
## Geometry

Determine the slant height of a right pyramid whose lateral area is 90 ft^2 and whose base is a regular hexagon with a 3 ft side.

*asked on May 12, 2011* -
## reading

Allusion- 1 Why did the author refer to "Hansel and Gretel"? 2 Why did this folk tale emphasize the horror of the Holocaust for Misha? 1 Because in Hansel and gretel the kids burned the witch and died but in Milkweed the jewish are burned. 2 Because it

*asked on May 25, 2009* -
## reading / Ms SUE

Why did the author refer to "Hansel and Gretel" in milkweed

*asked on May 24, 2009* -
## Word problems

I have some money, I spend half at the bookshop, a quarter at the supermarket and an eighth on sweets. I have £3.25 left.how much did I have to start with

*asked on October 6, 2016* -
## spanish

1)El hijo de tu madre y tu padrastro? ........... 2)la hija de tu madrastra o tu padrastro?....... can you help me answer these question?

*asked on November 18, 2010* -
## physic

Find the acceleration of the block of mass M = 5.06 kg in the figure below. (Take m = 4.24 kg.)

*asked on February 28, 2018* -
## physics

Please help. If you need the figure, let know how I can show you and I will do it. A particle moves in the xy plane (see the figure below) from the origin to a point having coordinates x = 7.00 m and y = 4.00 m under the influence of a force given by F =

*asked on March 13, 2018* -
## Statistics (Please help!!!)

The following table gives the number of deaths due to accidental falls for each month during 1970. Is there any evidence for a departure from uniformity in the rate over time? That is, is there a seasonal pattern to this death rate? If so, describe its

*asked on September 4, 2013* -
## physic

unit of distance used in astronomy is the parsec (pc): 1 pc = 3.26 ly. The distance to the Earth's next-nearest star, α-Centauri, is 1.3 pc. Find the distance d to α-Centauri in light-years and in meters.

*asked on January 19, 2018* -
## Economics

Suppose that there are 1,000 hot-pretzel stands operating in Toronto. Each stand has the usual U-shaped average total cost curve. Both the market demand curve and the supply curve for pretzels are linear, and the market for pretzels is in long-run

*asked on September 27, 2013* -
## Discrete Mathematics

When a theater charges $50 per ticket, a sold-out crowd of 600 will buy tickets. For every $5 increase in ticket price, 6 fewer people buy tickets. What ticket price would maximize the theater’s revenue? (Recall that revenue = price • quantity).

*asked on July 30, 2013* -
## Mathematics

Anna burned 15 calories per minute running for x minutes and 10 calories per minute hiking for y minutes. She spent a total of 60 minutes running and hiking and burned 700 calories. The system of equations shown below can be used to determine how much time

*asked on September 24, 2013* -
## geometry

A cone is topped with a hemisphere. Calculate the total surface area if the radius of the cone and hemisphere is 10 cm and the height of the cone is 24 cm.

*asked on May 12, 2011* -
## lambton

A rotating flywheel of diameter 48.0 cm uniformly accelerates from rest to 240 rad/s in 15.0 s. Find the linear velocity of a point on the rim of the wheel after 15.0 s. Round answer to one decimal place.

*asked on April 22, 2016* -
## SCIENCE

A MACHINE OF EFFICIENCY 60% IS USED TO RAISE A LOAD OF 150kg THROUGH A VERTICAL DISTANCE OF 2.5m.CALCULATE THE WORK DONE [IN JOULES]. I tried E=WORK OUTUT/WORK INPUT times 100% 60=150 times 10 times 2.5/work input times 100 60 times work input=3750 times

*asked on January 31, 2016* -
## Physics

Calculate the heat energy needed to change the temperature of 2 kg of copper from 10°C to 110°C. I forgot the formula

*asked on January 15, 2018*