# 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## Geometry

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

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

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

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

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

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

a cubic piece of metal measures 5.00 cm on each edge. if the metal is nickel, whose density is 8.90g/cm cubed, what is the mass of the cube?

*asked on September 11, 2008* -
## 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* -
## 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* -
## 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* -
## Math

Mary has a third of the money Erin has. Erin has $8 less than John. Together they have $267. How much money does each of them have?

*asked on January 10, 2017* -
## 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* -
## 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

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* -
## 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* -
## 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

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* -
## 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

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

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

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* -
## Physics

The helicopter view in the figure below shows two people pulling on a stubborn mule.(a).find the single force that is equivalent to the two forces shown.(b).find the force a third person would have to exert on the mule to make the net force equal to

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

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* -
## 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* -
## 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

Estimate the area under the curve f(x)=16-x^2 from x=0 to x=3 by using three inscribed (under the curve) rectangles. Answer to the nearest integer.

*asked on January 24, 2019* -
## physics question

Why will dropping or heating a magnet weaken it?

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

solve the equation 5coshx + 3sinhx = 4

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

Describe how a mixture of acetanilide and sand can be separated

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

Find the velocity, v(t), for an object moving along the x-axis if the acceleration, a(t), is a(t) = cos(t) − sin(t) and v(0) = 3. a) v(t) = sin(t) + cos(t) +3 b) v(t) = sin(t) + cos(t) +2 c) v(t) = sin(t) - cos(t) +3 d) v(t) = sin(t) - cos(t) +4

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

The speed of light in a vacuum is 2.998 × 10^8 m/s. What is its speed in miles per minute (mi/min)? Please explain the steps you used.

*asked on October 1, 2017* -
## 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* -
## 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

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* -
## 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* -
## Calculus

The base of a triangle is decreasing at the rate of 1 ft/sec, while the height is increasing at the rate of 2 ft/sec. At what rate is the area of the triangle changing when the base is 10 ft and the height is 70 ft? a) -25 ft^2/sec b) -45 ft^2/sec c) -50

*asked on February 1, 2019* -
## Calculus

A ball is thrown upward with a speed of 40 feet per second from the edge of a cliff 500 feet above the ground. What is the speed of the ball when it hits the ground? Use acceleration due to gravity as –32 feet per second squared and approximate your

*asked on February 17, 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* -
## 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* -
## 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

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* -
## 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* -
## 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* -
## math

A bottle contains 12 red marbles and 8 blue marbles. A marble is chosen at random and not replaced. Then, a second marble is chosen at random. Determine the probability that the two marbles are not the same color. Determine the probability that at least

*asked on April 26, 2019* -
## 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 particular solution of the differential equation dy/dt= 2y for which y(0) = 60 is a) y= 60e^2t b) y= 60e^0.5t c) y= 59 + e^t d) y= 30e^t

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

The components of a position vector of a particle moving in the plane are components t cubed, 2 times the sine of t. What is the distance traveled by the particle from t = 1 to t = π? Type your answer in the space below and give 3 decimal places. If your

*asked on April 8, 2019* -
## 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

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* -
## Math

Frank bought supplies for school. In the first store, he spent half of his money plus $10. In the second store, he spent half of what he had left, plus $10. In the third store, he spent 80% of what he had left. He came home with $5. How much did he start

*asked on July 5, 2017* -
## Calculus

If dy/dx=cos^2(πy/4) and y=1 when x=0, then find the value of x when y=3 a) 1/8 b) -π/8 c) -8/π d) None of these

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

Two ships leave a harbor entrance at the same time. The first ship is traveling at a constant 10 miles per hour, while the second is traveling at a constant 22 miles per hour. If the angle between their courses is 100°, how far apart are they after 2

*asked on July 30, 2015* -
## Calculus

The differential equation dy/dx=(x+1)/(x-2) I. produces a slope field with horizontal tangents at x = −1 II. produces a slope field with vertical tangents at x = 2 III.produces a slope field with rows of parallel segments a) I and II only b) II only c)

*asked on March 4, 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

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

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* -
## 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

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 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* -
## 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* -
## College Chemistry

The value of ΔG°f at 25°C for gaseous mercury is 31.85 KJ/mol. What is the vapor pressure of mercury at 25°C? [Hint: calculate the Kp for the reaction Hg(l)=Hg(g)]

*asked on December 6, 2010* -
## 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* -
## 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* -
## Calculus

The base of a solid in the xy-plane is the first-quadrant region bounded y = x and y = x^2. Cross sections of the solid perpendicular to the x-axis are equilateral triangles. What is the volume, in cubic units, of the solid? May I have all the explanation

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

Evaluate Σ from n=1 to infinity of 3/2^n-1 a) 12 b) 6 c) 3 d) 0 ----> my answer. Can you check for me, please? Thanks in advance

*asked on April 10, 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

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

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* -
## 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

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* -
## 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

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* -
## 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* -
## 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* -
## 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* -
## Physics

An ant on a picnic table travels 40 cm eastward, then 25 cm northward, and finally 15 cm westward. What is the ant's directional displacement relative to its original position?

*asked on November 3, 2012* -
## Calculus

If a factory continuously pumps pollutants into the air at the rate of √(t)/15 tons per day, then the amount dumped after 3 days is a)3.464 b)0.019 c)0.115 d)0.231 Note: I have integral from 0 to 3 of √(t)/15 dt but I guess something is wrong. Can you

*asked on April 11, 2019*