# 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* -
## 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* -
## mathematics

A triangle has sides 8 cm and 5 cm and an angle of 90 degrees between them. Calculate the smallest angle between them.

*asked on June 15, 2020* -
## 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

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* -
## 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* -
## 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 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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 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* -
## 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 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

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* -
## 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* -
## 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* -
## 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* -
## physics

Given that Earth orbits the Sun with a semimajor axis of 1.000 AU and an approximate orbital period of 365.24 days, determine the mass of the Sun. (1 AU = 1.496 ✕ 1011 m)

*asked on February 27, 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* -
## 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* -
## 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* -
## 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* -
## math

The ratio of girls to boys in a school is 5:3. If there 60 boys, how many girls are in the school? I guessed it is 5+3=8.8/60

*asked on February 7, 2017* -
## Physical science

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

*asked on March 25, 2015* -
## Math.

A road starts at a college and goes due north for 2000m, it then goes 2000m on a bearing 040 degree and ends at a market. How far is the market from the college

*asked on May 27, 2019* -
## physics

A physical pendulum in the form of a thin rod of length 1.04 m is pivoted at point P, a distance x from the pendulum's center of mass. Find the value of x for which the period of the pendulum will be a minimum.

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

The Moon orbits Earth in a nearly circular orbit that lasts 27.32 days. Determine the distance from the surface of the Moon to the surface of Earth.

*asked on February 24, 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* -
## 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

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* -
## SCIENCE

A BOX HAS A BASE SURFACE AREA OF25cm2 AND THE WEIGHT OF 100N.CALCULATE THE PRESSURE IT EXERTS ON THE GROUND.

*asked on May 14, 2016* -
## Geometry

4 balls each with a radius 1 inch fit snuggly into a 2x2x8 inch box. Is the total volume left over inside the box greater than or less than the volume of a fifth ball? Justify answer. I got as far as figuring the volume of box is 32 cubic inches I'm not

*asked on May 18, 2011* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## Algebra 2

How do you set up this?I am lost Find an equation for the linear model of the situation below and use it to make a prediction. A train is traveling north at a constant rate. At 3:00 P.M. it is 55 miles north of a city. At 4:15 P.M. it is 80 miles north of

*asked on October 12, 2011* -
## 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* -
## 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* -
## Algebra 1: 8th Grade

Simplify each expression. Write your answers using positive exponents. Check Answers Please: 1) 2^3*2^4 = 2^7 2)10^6/10^9 = 1/10^3 3)3^5*3^1 = 3^6 4)5^7*5^-4 = 5^3 5)9^3/9^-10 = 9^13 6) 4^11/4^8*4^-2 = 4^5 7) a^2*a^3 = a^5 8)b^-9/b^4 = 1/b^13 9)c^-5*c^-2 =

*asked on April 28, 2009* -
## physics

A simple harmonic oscillator's velocity is given by vy(t) = (0.86 m/s)sin(11t − 5.55). Find the oscillator's position, velocity, and acceleration at each of the following times. (Include the sign of the value in your answer) a) t = 0s b) t = 0.5s c) t =

*asked on April 24, 2018* -
## physics

In each situation shown in the figure below, a ball moves from point A to point B. Use the following data to find the change in the gravitational potential energy in each case. You can assume that the radius of the ball is negligible. (a) h = 1.45 m, θ =

*asked on March 8, 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* -
## 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* -
## Maths

There are m boys and 12 girls in a class what is the probability of selecting of random 1 a girl 2 a boy from class

*asked on January 29, 2017* -
## 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* -
## 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* -
## Chemistry

Is my answer correct? 25g/2.5cm^3 equals 1g/cm^3

*asked on September 10, 2012* -
## 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* -
## 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 27, 2011* -
## Physics

If a ball is fired at a rod pivoted at one end and the ball sticks to the rod and the ball-rod system rotates, then how does conservation of linear momentum work? There was linear momentum before, but after the collision it is all angular momentum? Does

*asked on May 13, 2020* -
## 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* -
## 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* -
## physic

can somebody show me how to find the time s step by step. A golfer hits his approach shot at an angle of θ = 46.3°, giving the ball an initial speed of v0 = 39.6 m/s (see figure below). The ball lands on the elevated green, yf = 4.1 m above the initial

*asked on February 6, 2018* -
## physic

A particle with mass m = 3.80 kg accelerates according to a = (−2.60i + 1.70j) m/s2. (a) What is the net force acting on the particle? (Express your answer in vector form.) F = N (b) What is the magnitude of this force? N

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

A race car travels 950 km around a circular sprint track of radius 1.343 km. How many times did it go around the track?

*asked on January 19, 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* -
## math

A student starts from A and walks 3km east to B, she then walk 5km on a bearing 152 degree from 13 . She reaches a point c . Find the distance and bearing of C from A.

*asked on May 25, 2017* -
## biology can someone check

Identify each of the parentheses items as an independent or dependent variable. 1)The (number of red blood cells )independent in a mouse's blood at(different levels of iron) dependent in its diet. 20)The (amount of starch formed)dependent in a plant leaf

*asked on December 28, 2010* -
## Physics

1. How does the back wheel of a bicycle turn if the torque of the chain/gear is applied at the center of the wheel? 2. In a real bicycle, the normal force on the front wheel from the ground acts slightly away from the vertical line passing through its

*asked on May 11, 2020* -
## physics

At one point during its swing, a wrecking ball exerts a tension force of FT = 9825 N on its cable, which makes an angle of α = 25.0° with the horizontal. The crane's 9.00-m-long boom is at an angle of θ = 60.0° with the horizontal. What is the torque

*asked on April 12, 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* -
## 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

In the figure below, 5.2 kg block A and 6.2 kg block B are connected by a string of negligible mass. Force A = (16 N) acts on block A; force B = (27 N) acts on block B. What is the tension in the string? (Express your answer in vector form.) To see the

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

Somebody please show me how to get to the answer key for this question.I have been stuck at this question for days. Two black holes (the remains of exploded stars), separated by a distance of 10.0 AU(1 AU = 1.50 ✕ 10^11 m), attract one another with a

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

Two spheres of mass M1 = 810 kg and M2 = 390 kg are placed 4.80 m apart. A particle of mass m = 12.0 kg is now placed midway between the two spheres. (a) What is the net gravitational force on the particle due to the two spheres? N toward the sphere of M1

*asked on February 21, 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* -
## 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

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* -
## physic

he magnitudes are F1 = 1.81f,F2 = f,and F3 = 2.00f,where f is a constant. (a) Use the coordinate system shown in the figure above to find R = F1 + F2 + F3 in component form in terms of f. (b) If x = 0.25, what is Ry?

*asked on January 26, 2018* -
## Social Studies

What was the purpose of the Freedman's Bureau?

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

a simple pendulum has a period of 2.0s and an amplitude of swing 5.0cm.calculate the maximum magnitude of the acceleration of the bob

*asked on October 5, 2016* -
## PSY

For an IQ test, we know the population _ 5 100 and the _X 5 16. We are interested in creating the sampling distribution when N 5 64. (a) What does that sampling distribution of means show? (b) What is the shape of the distribution of IQ means and the mean

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

How do I write a lexicon for the following words: sand goanna, dog, mosquito, spear, child, man, stone, prickle, and rabbit? How would I write rules describing the allomorphic variations in the forms of any of the morphemes?

*asked on September 9, 2013* -
## Discrete Mathematics

If f(x) = log2 (x - 2)3 and g(x) = log8 (x - 2), when is (f + g)(x) = 0?

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

Consider the following table of values for real valued functions f(x) and g(x). x 1 2 3 4 f(x) 3 1 4 2 g(x) 4 1 3 5 Find f o g(1) where o denotes function composition.

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

At time t = 0, a seed is planted. After t weeks, the height of the plant is given by f(t) = 0.3t² = 0.6t = 0.5 inches. At what rate is the plant growing after

*asked on May 13, 2013* -
## 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* -
## math

Find an equation of the line (in slope-intercept form) that passes through the point (7,5) and is perpendicular to the line 7x + 10y - 17 = 0 y=?

*asked on February 8, 2013* -
## trig

find the exact values of THE SIX TRIGONOMETRIC FUNCTIONS OF THE ANGLE THETA WHICH HAS A POINT ON THE TERMINAL SIDE OF (-1,4)

*asked on December 28, 2010* -
## reading

milkweed by jerry spinelli one,a thick, burly monster of a tree with warts, came down with a high, thin wail that sounded exactly like ababy criyng. what is bieng personified? what does this reaveal about the narrator`s feelings?

*asked on March 26, 2009* -
## Algebra 1

Where do I add parentheses to make this expression equal a 1 when it is simplified? Expression: 6 + 9 / 3 - 2 When this expression is simplified w/o any parentheses, it equals 7. I just need to know where to put the parentheses so that it will equal 1. And

*asked on September 4, 2008* -
## Logic

DAD=18, FISH=84, FEED=40, what is BEACH?

*asked on May 20, 2020* -
## Physics

A long rope is fixed at one end and the free end is made to oscillate in one plane at right angles to the rope with a frequency of 4Hz.The successive crest are 0.6 apart.Calculate the speed of the wave

*asked on May 19, 2020* -
## Math

The value of a car purchased for $28,000 decreases at a rate of 9% per year. What will be the value of the car after 7 years? ( round to the nearest tenth)

*asked on April 5, 2020* -
## Chemistry

Calculate the volume of CO2 that would be produced from 0.5 mole of Fe2O3 according to the equation.Fe2O3(s)+3CO(g)=2Fe(s)+3CO2(g). (1mole of a gas occupies 22.4dm3 at s.t.p)

*asked on October 19, 2019* -
## Geography

What 9 industries have shaped up Canada?

*asked on May 31, 2019* -
## 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* -
## Art

Give some examples of specific Greek temples and what material was used to make each. Explain what types of material changes were made in building Greek temples and what effect this has on the architectural world.

*asked on October 18, 2018* -
## 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 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* -
## physics

A wheel starts from rest and in 10.65 s is rotating with an angular speed of 5.810 π rad/s. (a) Find the magnitude of the constant angular acceleration of the wheel. rad/s^2 (b) Through what angle does the wheel move in 6.085 s? rad

*asked on April 11, 2018* -
## physics

A water molecule, consisting of two hydrogen atoms and one oxygen atom, resides in the plane of an x-y coordinate system. The coordinates of the oxygen atom and the two hydrogen atoms are, respectively, (0 m, 4.22 ✕ 10^−11 m), (7.57 ✕ 10^−11 m,

*asked on March 27, 2018*