# alice

Most popular questions and responses by alice-
## Science

At which position does the diver have the most gravitational potential energy? A.) 1 ( in diving board about to jump off, in a squatting position with hands above head) B.) 2 (In air, just after jumping off. Hands above head) C.) 3 ( About to head into the

*asked on December 11, 2018* -
## Physics

A ray of light of vacuum wavelength 550 nm traveling in air enters a slab of transparent material. The incoming ray makes an angle of 34.3◦ with the normal, and the refracted ray makes an angle of 18.9◦ with the normal. Find the index of refraction of

*asked on May 6, 2013* -
## physics

The greatest ocean depths on earth are found in the Marianas Trench near the Philippines, where the depth of the bottom of the trench is about 11.0 km. Calculate the pressure(atm)due to the ocean at a depth of 10.1 km, assuming sea water density is

*asked on July 18, 2013* -
## physics

A hair dryer draws a current of 9.7 A. (a) How much charge passes through the hair dryer in 3.5 min? 1 C (b) How many electrons does this represent? 2 electrons

*asked on May 11, 2012* -
## Chemistry

How does the molecular wight of the gas affect the k-value?

*asked on January 26, 2016* -
## Geometry

For diagonals of square Abcd intersect at e . If ae =2x+6 and bd =6x-10 find ac

*asked on March 21, 2013* -
## math

How do you find the area for an irregular figure using 3.14 for pi?

*asked on January 13, 2009* -
## physics

The sun radiates like a perfect blackbody with an emissivity of exactly 1. (a) Calculate the surface temperature(K) of the sun, given it is a sphere with a 7.00 multiplied by 108 m radius that radiates 3.80 multiplied by 1026 W into 3 K space. (b) How much

*asked on July 21, 2013* -
## Calculus(math)

A particle is moving on a straight line in such a way that its velocity v is given by v(t)=2t+1 for 0≤t≤5 where t is measured in seconds and v in meters per second. What is the total distance traveled (in meters) by the particle between times t=0

*asked on June 21, 2015* -
## Chemistry

Write balanced equations for the formation of [Ni(NH3)6][BF4]2 starting from an anhydrous sample of nickel(II) choride hexahydrate. (3 equations necessary) I am slightly confused by this. I think the starting sample has the formula [Ni(H20)6]Cl2 Would this

*asked on March 11, 2009* -
## physics

A gas at 250K and 15atm has a molar volume smaller than calculated from perfect gas law Calculate: a) the compression factor under these conditions b) the molar volume of gas

*asked on August 7, 2015* -
## Language Arts

The Passage is "The Trouble of Being Earnest" Which statement best expresses a theme of the passage? Some secrets are better left as secrets. Rules change depending on the situation. Marriage changes a person. Nothing is as it seems. I'm stuck between C

*asked on June 2, 2015* -
## physics

The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 7.40 g of condensation forms on a glass containing water and 210 g of ice, how many grams will melt as a result? Assume no other heat transfer

*asked on July 21, 2013* -
## physics

A 2.60 kg steel gas can holds 15.0 L of gasoline when full. What is the average density(kg/m^3)of the full gas can, taking into account the volume occupied by steel as well as by gasoline?

*asked on July 18, 2013* -
## Finance

5. John and Daphne are saving for their daughter Ellen's college education. Ellen just turned 10 (t=0), and she will be entering college 8 years from now (at t=8). College tution and expenses at State U. are currently $14,500 a year, but they are expected

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

Determine if the Mean Value Theorem for Integrals applies to the function f(x) = √x on the interval [0, 4]. If so, find the x-coordinates of the point(s) guaranteed to exist by the theorem. a) No, the theorem does not apply b) Yes, x=16/9 c) Yes, x=1/4

*asked on January 27, 2019* -
## Calculus

Find the distance, in meters, a particle travels in its first 10 seconds of travel, if it moves according to the velocity equation v(t)= 49 − 9.8t (in meters/sec) a) -49 b)0 c) 245 d) 441

*asked on January 26, 2019* -
## Calculus

Determine if the Mean Value Theorem for Integrals applies to the function f(x)=2-x^2 on the interval [0,√2). If so, find the x-coordinates of the point(s) guaranteed by the theorem a) No, the Mean Value Theorem for Integrals does not apply b) Yes, x=4/3

*asked on February 13, 2019* -
## chemistry

A moon rock collected by a U.S. Apollo mission is estimated to be 4.50 billion years old by uranium/lead dating. Assuming that the rock did not contain any lead when it was formed, what is the current mass of 206Pb per 1.150 g of 238U in the rock? The

*asked on February 11, 2015* -
## Calculus

Which of the following definite integrals could be used to calculate the total area bounded by the graph of y = sin(x), the x-axis, x = 0, and x = π a) ∫ from π to 0 sin(x)dx b) ∫ from π to 0 -sin(x)dx c) 2∫ from π to 0 sin(x)dx d) 1/2∫ from π

*asked on January 25, 2019* -
## Calculus

The temperature of a pan of hot water varies according to Newton's Law of Cooling: dT/dt= -k (T - A), where T is the water temperature, A is the room temperature, and k is a positive constant. If the water cools from 90°C to 85°C in 1 minute at a room

*asked on February 28, 2019* -
## Physics

On a certain dry sunny day, a swimming pool's temperature would rise by 1.60°C if not for evaporation. What fraction of the water must evaporate to carry away precisely enough heat to keep the temperature constant? (Lv =2430kJ/kg or 580kcal/kg)

*asked on July 20, 2013* -
## Calculus

The base of a solid in the first quadrant of the xy plane is a right triangle bounded by the coordinate axes and the line x+y =4. Cross sections of the solid perpendicular to the base are squares. What is the volume, in cubic units , of the solid? A) 8 B)

*asked on January 25, 2019* -
## math

a rectangle has a area 3 square feet and width 1/2 foot. What is the length of the rectangle? I think it is 3 times 1/2 equals 1 1/2 feet. Is this correct?

*asked on March 2, 2015* -
## Calculus

The function is continuous on the interval [10, 20] with some of its values given in the table above. Estimate the average value of the function with a Trapezoidal Sum Approximation, using the intervals between those given points. x 10;12;15;19;20 f(x)

*asked on March 12, 2019* -
## Calculus

The base of a solid is the circle x^2 + y^2 = 9. Cross sections of the solid perpendicular to the x-axis are equilateral triangles. What is the volume, in cubic units, of the solid? 36√3 36 18√3 18

*asked on January 30, 2019* -
## Calculus

Use two rectangles of equal width to estimate the area between the graph of f(x)=x+sin( πx) and the x-axis on the interval [4,8]. Evaluate the function at the mid-point of each rectangle to find each height. a) 20 b) 24 c) 26 d) 28 Thanks in advance

*asked on January 23, 2019* -
## Algebra

Find the solutions to the system. y=x^2+5x+6 y=4x+12 A. (2,20) and (-3,0) B. (2,20) and (-3,-18) C. (-2,-20) and (-3,-18) D. no solutions Find the solutions to the system. y=x^2-3x-1 y=8x-1 A. (0,-1) and (11,388) B. (0,-1) and (11,87) C. (-1,0) and (87,11)

*asked on May 29, 2018* -
## Calculus

A particle moves on the x-axis so that its position is continuous on the interval [3, 13] with some of its values for its velocity v(t) given in the table below. Use a right hand sum with 4 intervals to approximate the total distance the particle travelled

*asked on March 22, 2019* -
## Chemistry

Describe how a mixture of acetanilide and sand can be separated

*asked on June 17, 2018* -
## Calculus

Water leaks from a tank at the rate of r(t) gallons per hour. The rate decreased as time passed, and values of the rate at two-hour time intervals are shown in the table below. The total amount of water that leaked out is evaluated by a Riemann sum. Find

*asked on February 6, 2019* -
## Calculus

f(x) and g(x) are a differentiable function for all reals and h(x) = g[f(3x)]. The table below gives selected values for f(x), g(x), f '(x), and g '(x). Find the value of h '(1) Numerical answers expected! x 1 2 3 4 5 6 f(x) 0 3 2 1 2 0 g(x) 1 3 2 6 5 0

*asked on March 12, 2019* -
## Calculus

Use two rectangles of equal width to estimate the area between the graph of f(x) = x - cos(πx) and the x-axis on the interval [1, 5]. Evaluate the function at the mid-point of each rectangle to find each height. a) 8 b) 12 c) 16 d) 20 thank you in

*asked on January 12, 2019* -
## Calculus

Find the area of the region bounded by the graphs of y = x2 − 4x and y = x − 4. a) - 4.500 b) 4.500 c) 2.333 d) None of these

*asked on January 25, 2019* -
## English

Who is the Antagonist in Amy Tan's "A Pair of Tickets"? I know the Protagonist is June May but I couldn't figure out who the antagonist was. Yes, I have read the short story

*asked on September 11, 2013* -
## algebra

To balance a seesaw, the distance, in feet, a person is from the fulcrum is inversely proportional to the person's weight, in pounds. Peter, who weighs 150 pounds, is sitting 3 feet away from the fulcrum. If Joey weighs 90 pounds, how far from the fulcrum

*asked on April 7, 2013* -
## Calculus

Use Euler's Method with three equal step sizes to estimate the value of y(0.3) for the differential equation y ′ = y, with y(0) = 1. Type your answer in the space below and give 3 decimal places. If your answer is less than 1, place a leading "0" before

*asked on April 2, 2019* -
## Calculus

The base of a solid is bounded by the curve y=√ x + 1, the x-axis and the line x = 1. The cross sections, taken perpendicular to the x-axis, are squares. Find the volume of the solid.

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

If the space below, provide the smaller of the two positive integers that add 30 and have the largest possible product. Numerical Answers Expected!

*asked on December 19, 2018* -
## physics

The meter stick in the drawing can rotate about an axis located at the 20.0-cm mark. The axis is perpendicular to the screen. A force F acts at the left end; the force is perpendicular to the meter stick and has a magnitude of 175 N. A second force, either

*asked on February 11, 2011* -
## Calculus

The position equation for a particle is s(t)=√t^3+1 where "s" is measured in feet and "t" is measured in seconds. Find the acceleration of the particle at 2 seconds A) 1ft/sec^2 B) 2/3 ft/sec^2 C) - 1/108 ft/sec^2 D) None of these

*asked on December 26, 2018* -
## Physics

A proton moves eastward in the plane of Earth’s magnetic equator so that its distance from the ground remains constant. What is the speed of the proton if Earth’s magnetic ﬁeld points north and has a magnitude of 5.2 × 10−5 T? The acceleration of

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

solve the equation 5coshx + 3sinhx = 4

*asked on March 22, 2014* -
## Calculus

An animal population is modeled by the function A(t) that satisfies the differential equation dA/dt= A/1125 all this multiplied by (450-A). What is the animal population when the population is increasing most rapidly? a) 45 animals b) 225 animals c) 40

*asked on April 7, 2019* -
## Calculus

f(x) and g(x) are a differentiable function for all reals and h(x) = g[f(3x)]. The table below gives selected values for f(x), g(x), f '(x), and g '(x). Find the value of h '(1) Numerical answers expected! x 1 2 3 4 5 6 f(x) 0 3 2 1 2 0 g(x) 1 3 2 6 5 0

*asked on March 14, 2019* -
## Chemistry

What are the equilibrium concentrations of all the solute species in a 0.95 M solution of hydrogen cyanide, HCN? The Ka value = 6.2 x 10^-10. (a) [H3O+], M; (b) [OH-], M; (c) [HCN], M; (d) What is the pH of the solution? For HCN So far i have calculated

*asked on August 14, 2016* -
## Calculus

Given the table below for selected values of f(x), use 6 left rectangles to estimate the value of integral from 1 to 10 f(x)dx x 1 3 4 6 7 9 10 f(x) 4 8 6 10 10 12 16 Numerical answers expected

*asked on February 28, 2019* -
## History

Which best describes how the Scientific Revolution impacted people’s views about politics and government? (Select all that apply.) Government became understood as a natural process that could be changed and improved upon. Citizens believed that they

*asked on January 26, 2019* -
## Calculus

The graph of f ′(x), the derivative of x, is continuous for all x and consists of five line segments as shown below. Given f (0) = 6, find the absolute maximum value of f (x) over the interval [0, 3]. a) 0 b) 8 c) 10 d) 16

*asked on April 11, 2019* -
## Calculus

Find the absolute value of the resulting error if the value of integral from 0 to 3 (x^3 dx) is estimated with 3 trapezoids of equal width. a) 2.25 b) 5.25 c) 15.75 d) 47.25

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

The sun radiates like a perfect blackbody with an emissivity of exactly 1. (a) Calculate the surface temperature(K) of the sun, given it is a sphere with a 7.00 multiplied by 108 m radius that radiates 3.80 multiplied by 1026 W into 3 K space. (b) How much

*asked on July 20, 2013* -
## Geometry

You are designing dinnerware. What is the length of a side of the smallest square plate on which a 20-cm chopstick can fit along a diagonal without any overhang?

*asked on March 9, 2011* -
## Finance

Steve and Ed are cousins who were both born on the same day, and both both turned 25 today. Their grandfather began putting $2,500 per year into a trust fund for Steve on his 20th birthday, and he just made a 6th payment into the fund. The grandfather (or

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

The rational function (x-4)/x(2x-1) can be expressed as the sum of two partial fractions: A/x and B/(2x-1). Find the value of A – B. a) -11 b) 11 c) -3 d) 3

*asked on April 7, 2019* -
## Calculus

Which of the following functions grows at the same rate as e^x as x goes to infinity? a) e^(x+3) b) e^(3x) c) e^(2x) d) e^(-x)

*asked on March 12, 2019* -
## math

Fishing hook E is dropped 2.5 times its present depth. where is fishing hook E now? NOTE: FISHING HOOK E is -7.1 is the answer -4.14 or -17.75

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

(a) How many kilograms of water must evaporate from a 60.0 kg woman to lower her body temperature by 0.750°C?

*asked on July 21, 2013* -
## Calculus

Find d^2y/dx^2 for the curve given by x = 2t + 5 and y= 3t/2 a) 3/(4t+10) b) (4t+10)/3 c) 1 d) 0

*asked on April 3, 2019* -
## Calculus

The density of people (number of people per mile) during the evening rush hour for the 5-mile stretch along a certain sidewalk in New York is given by f(x), where x is the distance in miles north of the subway station. Which of the following gives the

*asked on March 23, 2019* -
## Calculus

Determine if the Mean Value Theorem FOR INTEGRALS applies to the function f(x) = x3 − 4x on the interval [−1, 1]. If so, find the x-coordinates of the point(s) guaranteed to exist by the theorem. THANK YOU VERY MUCH

*asked on February 14, 2019* -
## Calculus

the local linear approximation of a function f will always be greater than or equal to the function's value if, for all x in an interval containing the point of tangency, f'(x)

*asked on December 20, 2018* -
## Urgent math pls

The noise from a power mower was measured at 108 dB. The noise level at a rock concert was measured at 119 dB. Find the ratio of the intensity of the rock music to that of the power mower. (Round your answer to the nearest whole number.) I tried by 108-119

*asked on August 11, 2015* -
## Calculus

The base of a solid in the xy-plane is the circle x^2 + y^2 = 16. Cross sections of the solid perpendicular to the y-axis are equilateral triangles. What is the volume, in cubic units, of the solid? answer 1: (4√3)/3 answer 2: (64√3)/3 answer 3:

*asked on February 13, 2019* -
## math

On Saturday, the fruit and juice bar was selling 25 glasses of fruit punch an hour. By 3 p.m., they had sold 125 glasses. If their goal was to sell more than 300 glasses of fruit punch, find the number of hours, h, they must stay open to make their goal.

*asked on December 26, 2018* -
## geometry

in the proportion 2/8=8/32, which numbers is the geometric mean of the other two numbers?

*asked on June 17, 2014* -
## Calculus

For what value of t is the slope of the curve undefined for the graph defined by x = 10 – t^2, y = t^3 – 12t? Type your answer in the space below to the nearest whole number. (ex: 4) NOTE: I asked before this question but I didn't get the answer. I

*asked on April 5, 2019* -
## Calculus

The table below gives selected values for the function f(x). With 5 rectangles, using the left side of each rectangle to evaluate the height of each rectangle, estimate the value of the integral from 1 to 2 of f(x)dx. x 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8

*asked on April 3, 2019* -
## Calculus

Find the equation of the tangent to the curve at x = 3 for the parametric equations below: x= t+1/t y= t^2+1/t^2, with t>0 a) y= 2x+1 b) y= 6x-11 c) y= 6x-39 d) y= 2x-1

*asked on April 3, 2019* -
## Calculus

Find the volume of the solid formed by rotating the region bounded by the graph of y equals 1+ √x, the y-axis, and the line y = 3 about the line y = 5. a) 13.333 b) 17.657 c) 41.888 d) None of these

*asked on January 27, 2019* -
## math

The sum of Lisa's age and Myra's age is 19. In 10 years, Lisa will be 5 years older than Myra. How old is each girl now?

*asked on November 3, 2018* -
## Calculus

Find the polar coordinates for point P which has Cartesian coordinates (1,-√3) a) (1,5pi/6) b) (1,5pi/3) c) (√3,5pi/3) d) (2,5pi/3)

*asked on April 4, 2019* -
## Geometry

The length of one base of a trapezoid is 19 inches and the length of the median is 16 inches. Find the length of the other base.

*asked on March 22, 2013* -
## algebra

A certain population of bacteria doubles every 3 weeks. How long will it take for a population of 3,500 to triple?

*asked on April 27, 2008* -
## Calculus

Newton’s law of cooling states that the rate of cooling of an object is proportional to the temperature difference between the object and its surroundings. So the rate of cooling for a bottle of lemonade at a room temperature of 75°F which is placed

*asked on March 6, 2019* -
## math

a rectangle has length 3 feet and width 1/4 foot. What is the area of the rectangle? I think it is 3 x 4 equals 12 feet. Is this correct?

*asked on March 2, 2015* -
## Calculus

For what value(s) of r is the series the summation from n=1 to infinity of 1/(n^r+3) convergent? a) r > -2 b) r > -1 c) r ≥ -2 d) All values of r Please can you show me your work with the answer? Thank you very very much

*asked on April 17, 2019* -
## Calculus

Find the range of the function F(x)=integral from 0 to x of √(4-t^2) dt a) [0,4π] b) [0,π] c) [-4,0] d) [0,4]

*asked on April 20, 2019* -
## Calculus

Which of the following integrals can be integrated using partial fractions using linear factors with real coefficients? a) integral 1/(x^4-1) dx b) integral (3x+1)/(x^2+6x+8) dx c) integral x^2/(x^2+4) d) None of these

*asked on April 7, 2019* -
## Pre-Algebra

Martha is in a hot air balloon that has risen straight up from the launch point. Matthew is standing on the ground, 16 meters away from the launch point. If Martha and Matthew are 20 meters apart, how high has the balloon risen? A. 4 meters B. 12 meters C.

*asked on April 17, 2017* -
## Maths

The scale on a map is 1:200 000. Work out the number of kilometres represented by 2.5 cm on the map. I've never done a question like this before. If you can help I would be really grateful.

*asked on March 4, 2017* -
## Calculus

Use the series for f(x)=1/(1-x) to write the series for g(x)=Ln|1-x| a) C+ Ln|1+ x + x^2 + x^3+......| b) C+ 2+ 2x+ 3x^2 c) C+ x+ x^2/2 +x^3/3 d) None of these Note: you said since ln(1-x)= integral dx/(1-x) and integrate the taylor series for 1/(1-x). How

*asked on April 17, 2019* -
## Calculus

For what value(s) of r is the series the summation from n=1 to infinity of 1/n^r+1 convergent? a) r > -2 b) r > -1 c) r ≥ -2 d) All values of r

*asked on April 17, 2019* -
## Calculus

The last question please For what value of t is the slope of the curve undefined for the graph defined by x = 10 – t2, y = t3 – 12t? Type your answer in the space below to the nearest whole number. (ex: 4)

*asked on April 3, 2019* -
## Calculus

What does lim x-->∞ f(x)/g(x)=0 show? a) g(x) grows faster than f(x) as x goes to infinity b) f(g) and g(x) grow at the same rate as x goes to infinity c) f(x) grows faster than g(x) as x goes to infinity d) LHopital's Rule must be used to determine the

*asked on March 14, 2019* -
## Calculus

The base of a solid is the circle x^2+y^2=9. Cross sections of the solid perpendicular to the x-axis are semi-circles. What is the volume, in cubics units, of the solid? a) 9 π/4 b) 18π c) 9π d) 72π

*asked on January 27, 2019* -
## Calculus

The estimated value of the integral from 0 to 2 of x^2 dx , using the trapezoidal rule with 4 trapezoids is a) 2.75 b) 5.50 c) 1.88 d) 3.75

*asked on February 28, 2019* -
## Calculus

The differential equation dy/dx = x/y^2 Possible answers: I. will have a slope field with negative slopes in quadrant I II. will have a slope field with positive slopes in all quadrants III.will produce a slope field with columns of parallel tangents IV.

*asked on February 28, 2019* -
## Calculus

Which of the following functions of x can be integrated with respect to x without integration by parts, and purely using integration by u-substitution and the knowledge of the antiderivative of the tangent function? a) x^2tan(x^2) b) xtan^2(x) c) x^2tan(x)

*asked on April 20, 2019* -
## Calculus

Which of the following functions grows the fastest as x goes to infinity? a) f(x) √x b) f(x) √(x+1) c) f(x) √(10x+1) d) They all grow at the same rate as x goes to infinity

*asked on March 22, 2019* -
## chemistry

What percentage of the Ba2+ in solution is precipitated as BaCO3(s) if equal volumes of 2.4*10^-3 M Na2CO3(s) and 1.1*10^-3M BaCl2(aq) are mixed

*asked on November 21, 2012* -
## math

body of mass 7 kg moves in a (counterclockwise) circular path of radius 4 meters, making one revolution every 13 seconds. You may assume the circle is in the xy-plane, and so you may ignore the third component. how do you find the centripetal force acting

*asked on February 18, 2009* -
## Calculus

Calculate the area under the graph of f of x equals the negative of the natural logarithm of x above the x-axis on the interval (0, 1] a) infinite b) 2 c) 1 d) 0

*asked on April 2, 2019* -
## Algebra

The Gulf Stream is a warm ocean current that extends from the eastern side of the Gulf of Mexico up through the Florida Straits and along the southeastern coast of the United States to Cape Hatteras, Nort Carolina. A boat travels with the current 110 mi

*asked on February 22, 2019* -
## Calculus

Use a graphing calculator to graph f(x)=(2x^2-8)/(x^2-6) and then select the response which is true a) f increases without bound b) f has no tangent line c) f has a horizontal tangent line d) none of these responses

*asked on December 20, 2018* -
## physics question

Why will dropping or heating a magnet weaken it?

*asked on May 16, 2012* -
## Calculus

Find the magnitude of a particle's acceleration vector at t = 1 for a particle moving with position vector r(t)=(2t^2,4t^2-t^3) a) 4 b) 25 c) 5 d) 2√5

*asked on April 6, 2019* -
## Calculus

Function f(x) is positive, decreasing and concave up on the closed interval [a, b]. The interval [a, b] is partitioned into 4 equal intervals and these are used to compute the left sum, right sum, and trapezoidal rule approximations for the value of

*asked on February 28, 2019* -
## Algebra

Jody invested $4800 less in an account paying 5% simple interest than she did in an account paying 2% simple interest. At the end of the first year, the total interest from both accounts was $551. Find the amount invested in each account

*asked on February 22, 2019* -
## Calculus

If f(x) = |(x^2 − 4)(x^2 + 2)|, how many numbers in the interval [0, 1] satisfy the conclusion of the Mean Value Theorem?

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

using a circle graph of 1/3 percussion, 2/5 brass, 4/15 woodwind and also a circle graph of 1/3 woodwind, 1/6 percussion, 1/2 brass. Both bands combine as one band. A. What fraction of the band members will play brass instruments? B. what fraction of band

*asked on March 9, 2015*