# elle

Most popular questions and responses by elle-
## Physics

An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.5× 104 kg, and the force causes its speed to change from 7000 to 5000m/s. (a) What is the work done by the

*asked on April 4, 2014* -
## Physics

When subjected to a force of compression, the length of a bone (compression Young's modulus 9.4 x 109 N/m2, tensile Young's modulus 1.6 x 1010 N/m2) decreases by 1.5 x 10-5 m. When this same bone is subjected to a tensile force of the same magnitude, by

*asked on April 25, 2014* -
## Physics.. please help!!!!!

A ball of mass 0.4 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker’s foot is 16 m/s at angle of 46◦ above the horizontal. The top of the fence is 4 m

*asked on October 20, 2011* -
## Chemistry

A coffee-cup calorimeter initially contains 125 g water at 24.2 degrees celsius. Potassium bromide (10.5 g), also at 24.2 degree celsius, is added to the water, and after the KBr dissolves, the final temperature is 21.1 degrees celsius. Calculate the

*asked on February 13, 2012* -
## chemistry

Determine the theoretical and percent yield of hydrogen gas is 36 g of water undergoes electrolysis to produce hydrogen and oxygen and 3.8 g of hydrogen is collected.

*asked on February 8, 2012* -
## math

A glass is 1 4 full. Then 70cm3 of orange juice is poured in. The glass is now 3 5 full. What is the total volume of the glass?

*asked on March 3, 2019* -
## Chemistry

How many milliliters of .200 M NaOH solutions are needed to react with 40.0 mL of a 0.340 M NiCl2 solution? Equation: NiCl2(aq) + 2NaOH(aq) --> Ni(OH)2(s) +2NaCl(aq)

*asked on July 20, 2015* -
## Math

A club consists of 8 seniors, 7 juniors, and 4 sophomores. A subcommittee consisting of 3 seniors, 2 juniors, and 1 sophomore will be chosen. How many different such subcommittees are there?

*asked on April 11, 2013* -
## pre algebra

when rounding 4m to the nearest meter

*asked on December 18, 2018* -
## Math

Show that f(x) = x3 and g(x) = 200x3 grow at the same rate

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

A speeder traveling at 30 m/s passes a motorcycle policeman at rest at the side of the road. The policeman accelerates at 2.4 m/s2. To the nearest tenth of a second how long does it take the policeman to catch the speeder?

*asked on February 7, 2014* -
## Physics

A long solenoid has 1400 turns per meter of length, and it carries a current of 2.0 A. A small circular coil of wire is placed inside the solenoid with the normal to the coil oriented at an angle of 90.0˚ with respect to the axis of the solenoid. The coil

*asked on October 19, 2014* -
## Physics

An object is placed in front of a converging lens in such a position that the lens (f = 13.2 cm) produces a real image located 23.5 cm from the lens. Then, with the object remaining in place, the lens is replaced with another converging lens (f = 18.8 cm).

*asked on December 1, 2014* -
## physics

A spring (k = 905 N/m) is hanging from the ceiling of an elevator, and a 4.8-kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at a = 0.74 m/s2?

*asked on April 25, 2014* -
## Chemistry

A portable electric water heater transfers 255 watts (W) of power to 5.5 L of water, where 1 W = 1 J/s. How much time (in minutes) will it take for the water heater to heat the 5.5 L of water from 25 degrees celsius to 42 degrees celsius? (Assume that the

*asked on February 9, 2012* -
## Astronomy

Hi, can you please check my work? I really need to do well on this. 1. What properties of a star are needed to calculate the stars luminosity? a. size and apparent brightness b.mass and distance to the star**** c. temperature and diameter of the star d.

*asked on December 9, 2016* -
## Chemistry

25.0 mL of ethanol (density = 0.789 g/mL) initially at 7.0 degrees celsius is mixed with 35.0 mL of water (density = 1.0 g/mL) initially at 25.3 degrees celsius in an insulated beaker. Assuming that no heat is lost, what is the final temperature of the

*asked on February 9, 2012* -
## chemistry

If the amount of mercury in a polluted lake is 0.40 ug/mL, what is the total mass of mercury in the lake? (The lake has a surface area of 100 mi squared and an average depth of 25 ft).

*asked on September 12, 2011* -
## Geometry

Find the coordinates of point B on Line AC such that AB is 2/3 of AC (B is located in between A and C). A is (1,-5) and C is (-5,4).

*asked on February 15, 2019* -
## Algebra

a radio commercial for a loan company states: "You only pay 10 cents a day for each $500 you borrowed." If you borrow $2000 for 50 days, what amount will you repay.

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

When subjected to a force of compression, the length of a bone (compression Young's modulus 9.4 x 109 N/m2, tensile Young's modulus 1.6 x 1010 N/m2) decreases by 1.5 x 10-5 m. When this same bone is subjected to a tensile force of the same magnitude, by

*asked on April 25, 2014* -
## Pharmacy Calculaions

I can't get this right! Please help... Based on the formula below, what quantities of each are needed to make 180 ml of this lotion? Benzyl Benzoate 250 ml Triethanolamine 5 ml Oleic Acid 20 ml Purified water to make 1000 ml

*asked on February 21, 2013* -
## Statistics, Math

What statistical tool should be used to determine the influence of independent variable to dependent variable?

*asked on April 18, 2019* -
## math

a light year is the distance light travels in one year. one light year is about 5.9x10^12 mi. If it takes light 3 months to travel from one star to another, about how far apart are the stars? 5.9x10^12/12*3 I got 1.5x10^12 mi Is this correct?

*asked on January 9, 2014* -
## Chemistry

Hydrogen and oxygen gas combine explosively to produce water. Write a balanced chemical equation for this process. If 10 mol of hydrogen reacted with oxygen, what volume of liquid water could be produced?

*asked on October 14, 2010* -
## binomial distribution

hey, i'd really appreciate some help with this question: A medical treatment is successful 75% of the time. A hospital wishes to treat a group of patients. How many patients should they take so that the probablity that all are cured is 1/10? I know that

*asked on August 25, 2007* -
## Physics

Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of the orbit is 2.26 × 10-11 m. Determine the magnitude of the

*asked on September 4, 2014* -
## physics

how many revolutions per minute would a 15 m ferris wheel need to make for passengers to feel weightless at the top?

*asked on January 2, 2011* -
## Math

How many different functions are there from a set with 10 elements to sets with the following numbers of elements? a) 2 b) 3 c) 4 d) 5

*asked on April 28, 2009* -
## Maths - Reiny

Show that the equation 3x^2 - x^3 + 3 = 0 can be rearranged to give: x = 3 + 3 ---- x^2 x^3 = Divide by ? = x = 3 + 3 ---- x^2 Using Xn+1 = 3 + 3 with x0 = 3.2 ---- x^2n find the values of x1 x2 and x3? What to the values of x1 x2 and x3 represent? The

*asked on January 3, 2017* -
## Physic

Copy of Vector A has a magnitude of 9 and is at an angle of 30.4 degrees measured counter-clockwise from the x axis. Vector B has a magnitude of 12 and is at an angle of 102.3 degrees measured counter-clockwise from the x axis. Vector C has a magnitude of

*asked on September 24, 2015* -
## Physics

A planet has a mass of 6.15 × 1023 kg and a radius of 3.25 × 106 m. (a) What is the acceleration due to gravity on this planet? (b) How much would a 79.4-kg person weigh on this planet?

*asked on February 28, 2014* -
## Physics

A space probe is traveling in outer space with a momentum that has a magnitude of 7.84 x 107 kg·m/s. A retrorocket is fired to slow down the probe. It applies a force to the probe that has a magnitude of 1.29 x 106 N and a direction opposite to the

*asked on April 10, 2014* -
## Physics help!!

A crate is pulled to the right with a force of 80 N, to the left with a force of 125.8 N, upward with a force of 615.4 N, and downward with a force of 248 N. Net external force in the x direction: -45.8 Net external force in the y direction: 367.4 N how do

*asked on November 11, 2011* -
## Physics

A 61.5-Ω resistor is connected in parallel with a 146.6-Ω resistor. This parallel group is connected in series with a 16.0-Ω resistor. The total combination is connected across a 13.6-V battery. Find (a) the current and (b) the power dissipated in the

*asked on October 3, 2014* -
## Physics

A volleyball is spiked so that it has an initial velocity of 15.6 m/s directed downward at an angle of 56.9 ° below the horizontal. What is the horizontal component of the ball's velocity when the opposing player fields the ball?

*asked on February 21, 2014* -
## Physics

A 4.07 x 10-2-kg block is resting on a horizontal frictionless surface and is attached to a horizontal spring whose spring constant is 144 N/m. The block is shoved parallel to the spring axis and is given an initial speed of 10.5 m/s, while the spring is

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

A skater with an initial speed of 5.90 m/s stops propelling himself and begins to coast across the ice, eventually coming to rest. Air resistance is negligible. (a) The coefficient of kinetic friction between the ice and the skate blades is 0.125. Find the

*asked on March 14, 2014* -
## Geometry

PQR is congruent to DJE. complete the statement below PR is congruent to __, DJ is congruent to __ angle E is congruent to __ 1) PR is congruent to PQ, DJ is congruent to PQ, angle E is congruent to angle R 2) PR is congruent to DE, DJ is congruent to DR,

*asked on January 15, 2012* -
## Physics help!!

A team of dogs drags a 150 kg sled 1.39 km over a horizontal surface at a constant speed. The coeﬃcient of friction between the sled and the snow is 0.236. The acceleration of gravity is 9.8 m/s^2. Find the work done by the dogs. Also, What is the energy

*asked on December 1, 2011* -
## Physics

An object is placed to the left of a lens, and a real image is formed to the right of the lens. The image is inverted relative to the object and is one-half the size of the object. The distance between the object and the image is 65 cm. (a) How far from

*asked on December 1, 2014* -
## Physics

Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of the orbit is 2.26 × 10-11 m. Determine the magnitude of the

*asked on September 5, 2014* -
## Algebra

x -4 -3 -2 -1 0 1 2 3 4 y 18 8 0 -6 -10 -12 -12 -10 -6 What is the vertex of the parabola? The x-coordinate is 1.5.

*asked on April 13, 2018* -
## Physics

A 4.07 x 10-2-kg block is resting on a horizontal frictionless surface and is attached to a horizontal spring whose spring constant is 144 N/m. The block is shoved parallel to the spring axis and is given an initial speed of 10.5 m/s, while the spring is

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

two groups of paddlers meet in the middle of a lake. after a brief visit a person in canoe 1 pushes on canoe 2 with a force of 46 N . Mass of canoe 1 is 150 kg and mass of canoe 2 is 250 kg. find acceleration of each canoe

*asked on March 27, 2014* -
## Dividing decimals

How do you solve 49.05 divided by 2.5. Need to see step by step process.

*asked on March 2, 2014* -
## Chemisty

16.72g of sodium acetate trihydride (MW=136 g/mol) is dissolved in 100mL water. To this, 4.00g glacial acetic acid (Ka=2.2x10-5, MW=60.0 g/mol) is added, and distilled water is added to to the 500mL mark. Find the final pH and the molar concentration of

*asked on January 20, 2012* -
## circular (trigonometric) functions

hi, i need help solving this trigonometric equation: sinx+3cosx=0 i don't know what to do as i can't just diviide the two to create tanx which is what i have been doing in previous questions... yes, you are on the right track sinx = -3cosx sinx/cosx = -3

*asked on April 14, 2007* -
## Algebra

A total of 8000 dollars is invested in two funds paying 4 percent and 5 percent annual interest,. The combined interest for the year is 350 dollars. How much of the 8000 dollars is invested in each fund?

*asked on April 13, 2018* -
## trig

You are sky diving and are trying to land on a target with a radius of 15 m. You land 10 m west and 10 m north of the center of the target. a. Write an inequality to describe the region inside the target area. b. Do you land within the target area? c. If

*asked on December 20, 2011* -
## Math

How many different functions are there from a set with 10 elements to sets with the following numbers of elements? a) 2 b) 3 c) 4 d) 5

*asked on April 27, 2009* -
## Pre-calculus

Given the following values for f(t): t : f(t) 3 : -7 6 : 6 9 : 19 12 : 6 15 : -7 18 : 6 a) What is the period, frequency, midline, amplitude, maximum, and minimum? b)Find a possible formula for f(t) c)Find the domain and range of f(t) d)Find a formula for

*asked on March 26, 2009* -
## Physics

A skateboarder shoots off a ramp with a velocity of 5.7 m/s, directed at an angle of 58° above the horizontal. The end of the ramp is 1.3 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the

*asked on February 21, 2014* -
## World History

What factor led the English to attempt to kill off entire Native American peoples? A. Native Americans provided a good labor source for the Spanish. B. Native Americans had vast wealth to exploit for tribute. C. The Native Americans' large populations were

*asked on September 6, 2012* -
## Quantum Physics

Calculate the transition ratio between the 2P-1S and 3P-2S states of the hydrogen.

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

In a state legislature there were 119 more members in the House of Representatives than in senate. If there were m members in senate, write an expression to represent the totial members in the state legislature. PLZ HELP!!!!!

*asked on March 28, 2017* -
## Maths

The first 5 terms of an arithmetic sequence are: 7 13 19 25 31 Prove that the difference between the squares of any two terms of the sequence is always a multiple of 24 Nth term = ? Nth term squared = ? Mth term = ? Mth term squared = ? Difference = ? ? =

*asked on January 3, 2017* -
## physic

A ball is dropped from the top of an apartment building. A person is on a patio somewhere beneath the top of the apartment building and the person notices the ball takes 0.11 seconds to fall from the top of his patio to the bottom of his patio. The height

*asked on September 24, 2015* -
## Trig

The graph of y-7 cosθ + 24 sinθ would be a sinusoid if it were plotted. What would be the first positive value of θ at which there is a high point?

*asked on April 22, 2015* -
## Physics

A 74.2-kg climber is scaling the vertical wall of a mountain. His safety rope is made of a material that, when stretched, behaves like a spring with a spring constant of 1.62 x 103 N/m. He accidentally slips and falls freely for 0.959 m before the rope

*asked on May 2, 2014* -
## math

simplify 4^8/4^-4 Would this be 4^4 the correct answer?

*asked on October 14, 2013* -
## Physics

Two bullets have masses of 2.4 g and 5.2 g, respectively. Each is ﬁred with a speed of 37.0 m/s. a) What is the kinetic energy of the ﬁrst bullet? b) What is the kinetic energy of the second bullet? I initially used KE=1/2MV^2 and got 1642.8 J, but got

*asked on November 29, 2011* -
## Trig!

The identities cos(a-b)=cos(a)cos(b)sin(a)sin(b) and sin(a-b)=sin(a)cos(b)-cos(a)sin(b) are occasionally useful. Justify them. One method is to use rotation matricies. Another method is to use the established identities for cos(a+b) and sin (a+b).

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

A satellite has an orbit with pedigree 175 km and apogee 181,200 km. What is the period of the orbit? >>I'm not sure what the associated equation is. I tried the problem using the average radius in the period equation but it didn't work. Please help!

*asked on May 9, 2009* -
## Algebra

What is the length of the interval of solutions to the inequality 1 ( is less than or equal to) 3-4x (is less than or equal to) 9? I presume that I just plug in numbers for x? The problem is, that all the positive numbers I've tried have made them way less

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

ecologists usually study a specfic populaions of organisms rather than studying the entire species why?

*asked on September 16, 2008* -
## Another binomial distribution question

hi, i'd also really like some help for another binomial distribution question, i have no idea where to start... the question is: A manufacturer makes 10,000 ball point pens per day and estimates that 400 will be defective. She decides that if a random

*asked on August 25, 2007* -
## Math

Which property is shown by 3+2 = 2+3 A Commutative property of addition B identity property of addition C distribute property D associative property

*asked on October 3, 2018* -
## Science

What do I mix to make a skin bomb?

*asked on July 3, 2018* -
## Math

In a class of 20 students, the average (arithmetic mean) score on a test is 84 points. If 6 students each scored 100 points and 4 students each scored 50 points, what is the average of the scores of the remaining students?

*asked on February 24, 2018* -
## pre calculus

find 2 solutions of tan θ=.6524 in both degrees and radians. I know the answer are 33.12 degrees/.578 radians and 213.12 degrees/3.72 radians, but how do you find this? Thanks!!!!

*asked on November 15, 2015* -
## Chemistry

How would you write the equation to represent "Nitrogen and Oxygen react to form Nitrogen Dioxide".

*asked on October 4, 2015* -
## physic

A baseball is hit from home plate and it winds up in the stands as a homerun. From the point it was hit, it lands a horizontal displacement of 121.9 meters and a vertical displacement of 21.2 meters (in +y direction). If it took 5 seconds to travel from

*asked on September 24, 2015* -
## physic

A projectile is launched from the ground at 34.8 m/s at an angle of 44.5 degrees above the horizontal. How long, in seconds, does it take such that its angle of trajectory (it's velocity vector) is 20.6 degrees below the horizontal?

*asked on September 24, 2015* -
## math

simplify (x^2-3x+6)-(36x^2-18x+6/6) (x^2-3x+6)-(6(6x^2-3x+1/6) cancel the two 6's in the second part of equation x^2-3x-6x^2+3x-1 -5x^2-1 Is This correct? Thanks

*asked on November 12, 2013* -
## math

one candy bar contains 220 calories. If this represents 10% of the total calories a person consumes in one day, find the total number of calories consumed in a day. 220/x=10/100 cross multiply so x=2200 is this correct? thanks

*asked on October 29, 2013* -
## math

the expression 10x^2+6x^3 is the result of applying the distributive property to the expression 2x^2(5+3x). write the expression such that you applied the distributive to your expression it will give the result presented 1) m^2(a+b)+m^3(a+b) for this I got

*asked on October 10, 2013* -
## Trig

Verify the identity. 1/(tanx-secx) + 1/(tanx+secx) = -2tanx

*asked on May 9, 2013* -
## math

Part 1 : Store equipment is purchased on January 1, 2002 at a cost of $14,000 and $1,000 was spent on its installation. The depreciation is written-off at 10% on the original cost every year. The books are closed on December 31, every year. Instructions:

*asked on March 28, 2013* -
## Physics

Two objects are connected by a string with a mass less, friction less pulley. The coefficient of friction is .298. The block on the table is 4 kg. What must the mass of the hanging block be so that the block on the table will move with a constant speed?

*asked on November 19, 2012* -
## Physics

A 1.1 kg lizard lies on a flat rock tilted. A person decides to tilt the rock hoping that the lizard falls off. The rock is tilted at an angle of 15 degrees with respect to the horizontal. The coefficient between the rock and the lizard is .16. What is the

*asked on November 19, 2012* -
## organic chem

if sulfuric acid was not added to isopentyl alcohol how would that affect the results

*asked on February 14, 2012* -
## Math

Lee has two tests to study for: Chemistry and French. She plans to study for up to 13h in total. She will spend at least 4 hours studying Chemistry and up to 6 hours studying French. Let x represent the number of hours she will spend studying Chemistry,

*asked on July 24, 2009* -
## college earth science and astronomy

This isn't homework as much as I am trying to learn this on my own. I am trying to perform an experiment on solar power. I measured and recorded the volume (V= 250 mL) and mass (M= 250 g) of water in a cup. I then recorded the initial temperature(32

*asked on March 18, 2009* -
## maths

hey, i would really appreciate some help solving for x when: sin2x=cosx Use the identity sin 2A = 2sinAcosA so: sin 2x = cos x 2sinxcosx - cosx = 0 cosx(2sinx - 1)=0 cosx = 0 or 2sinx=1, yielding sinx=1/2 from cosx=0 and by looking at the cosine graph, we

*asked on July 17, 2007* -
## equations of tangents and normals

hi, i'd really appreciate some help solving this question! I am completely at loss here :/ The question is to: Find the equation of the normal to y=loge(x+2) which is parallel to the line with equation y+3x-5=0 I am fine at solving these sorts of equations

*asked on May 20, 2007* -
## Math

Find the measure of two complementary angles if the measure of one angle is 30˚ greater than the measure of the other. What is the measure of the larger angle? What is the measure of the smaller angle?

*asked on February 24, 2018* -
## Science

How many atoms are there in one molecule of the following compounds? a. silver chloride- AgCl b. calcium oxide- CaO c. Magnesium nitride- Mg3N2 d. Aluminium oxide- Al2O3 e. Scandium sulfide- Sc2S3 f. Hydrogen Peroxide- H2O2

*asked on June 1, 2017* -
## Maths

Here is a right- angled triangle. |\ | \ x | \ |___\ x - 2 All measurements are in centimetres. The area if the triangle is 2.5cm^2. Find the perimeter of the triangle. Key values: Equation for area: ? - __(___) = ? ? Quadratic equation: -b ± √b^2 - 4ac

*asked on January 3, 2017* -
## Math

Suppose the ice cream shop offers 9 different flavours, and we share 5 scoops. How many ways of ordering are there if All different any combination two scoops of one flavour, two scoops of 2nd, and one of third first one, i did 9! / 5!? second one and

*asked on November 13, 2016* -
## Physic

A quarterback (QB) is running at 3.2 m/s at an angle of 25 degrees with x axis as shown in the sketch. At the moment he's at the origin (x = y = 0) he throws the football to a receiver which is stationary located at the coordinates x = 10 meter, y = 6

*asked on September 24, 2015* -
## Math

Whars 189.80. Times 6.25% less 33 1/3 % Is it 189.80 + 11.86 = 201.66 - 67.22 = $134..44

*asked on November 14, 2014* -
## Physics

A pitcher throws a 0.192-kg baseball, and it approaches the bat at a speed of 43.2 m/s. The bat does 69.8 J of work on the ball in hitting it. Ignoring air resistance, determine the speed of the ball after the ball leaves the bat and is 32.6 m above the

*asked on April 4, 2014* -
## Physics

A 39.7-kg crate rests on a horizontal floor, and a 65.3-kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.

*asked on March 7, 2014* -
## math

during a clinical study, a medical company found 3 out of 70 people experienced a side effect when using a certain medicine. The company predicts 63,000 people will use the medicine next year. How many people are expected to experience a side effect?

*asked on December 17, 2013* -
## math

when 7x^4-49x^3+7x^2 is divided by 7x^2, the quotient is when I divided I got x^2-7x+1 Is this correct?

*asked on October 17, 2013* -
## math

The average temperature in the artic circle is -25degrees Celsius. To the nearest integer, what is the average temperature in the artic circle in degrees Fahrenheit? I got -13 degrees I did F=9/5(-25)+32 -45+32=-13 Is this correct?

*asked on October 15, 2013* -
## Physics.. please help!!!!!

A crate is pulled to the right with a force of 80 N, to the left with a force of 125.8 N, upward with a force of 615.4 N, and downward with a force of 248 N. What is the net external force in the x direction? y direction?? Also.... What is the magnitude of

*asked on November 9, 2011* -
## Physics.. please help!!!!!

A person walks 28.2◦ north of east for 3.33 km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? How far would this person walk due east?

*asked on October 9, 2011* -
## algebra 1

I was given this interesting problem: The length of a rectangle is 6 feet longer than its width. The perimeter is less than 48 feet. Write a mathematical expression for the width of the rectangle. How do I go about doing this?

*asked on July 4, 2011*

## Pages

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