# tom

Popular questions and responses by tom-
## 3rd grader needs help with grammar

Is it..... my Classmates and me or my classmates and I

*asked on May 6, 2009* -
## chemistry

If the density of a certain alcohol is 0.785 g/mL, what volume of the alcohol would have a mass of 75.0g?

*asked on September 2, 2011* -
## physics

A trained dolphin leaps from the water with an initial speed of 12 m/s. It jumps directly towards a ball held by the trainer a horizontal distance of 5.50 m away and a vertical distance of 4.10 m above the water. In the absence of gravity the dolphin would

*asked on May 20, 2012* -
## art

Modernism focused on the distinction between “high” and “low” culture in fine art. Which of the following reacted against this distinction by incorporating images from “lowbrow” culture into works of fine art? a)Minimalism b)Pop Art c)Site

*asked on September 21, 2018* -
## Physics

A model rocket has a mass of 0.435 kg. It is mounted vertically and launches directly up with a thrust force of 13.1 N. a) What is the weight of the rocket? b) Determine the net force on the rocket as it is launched. c) What is the acceleration of the

*asked on December 15, 2016* -
## math

find the value of k such that the equation e^(2x)=krootx has exactly one solution.

*asked on April 4, 2013* -
## Physics

In a classroom demonstration, a 79.2-kg physics professor lies on a “bed of nails.” The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. While the

*asked on June 5, 2012* -
## Chemistry

What is the trend in atomic size in the series of Group IIA elements Be through Ra?

*asked on November 14, 2011* -
## calculus

An observer is 20 m above the ground floor of a large hotel atrium looking at a glass-enclosed elevator shaft that is 20 m horizontally from the observer (see figure). The angle of elevation of the elevator is the angle that the observer's line of sight

*asked on November 9, 2014* -
## Math

For the geometric series, S4/S8 = 1/17. Determine the first three terms of the series if the first term is 3.

*asked on January 4, 2014* -
## statistics

Based on data collected by the National Center for Health Statistics and made available to the public in the Sample Adult database, an estimate of the percentage of adults who have at some point in their life been told they have hypertension is 23.53

*asked on September 13, 2011* -
## Math

The height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. When graphed, the function gives a line with a slope of −0.6 Suppose that the height of the candle after 19 hours is 9.6 centimeters. What

*asked on September 8, 2015* -
## Chemistry

The piperazine content of an impure commercial material can be determined by precipitating and weighing the diacetate: (C2H4)2N2H2 + 2 CH3COOH → (C2H4)2N2H2(CH3COOH)2 In one experiment, 0.3126 gram of the sample was dissolved in 25 mL of acetone, and 1

*asked on August 23, 2014* -
## physics

At the equator, the earth’s field is essentially horizontal; near the north pole, it is nearly vertical. In between, the angle varies. As you move farther north, the dip angle, the angle of the earth’s field below horizontal, steadily increases. Green

*asked on April 14, 2011* -
## math

Does the series converge or diverge? If it converges, what is the sum? Show your work. ∑∞n=1−4(−12)n−1

*asked on May 2, 2019* -
## physics

The froghopper, Philaenus spumarius, holds the world record for insect jumps. When leaping at an angle of 58.0 degrees above the horizontal, some of the tiny critters have reached a maximum height of 58.7 cm above the level ground. (See Nature, Vol. 424,

*asked on February 8, 2016* -
## Physics

In an experiment conducted using the Young's double-slit apparatus, the separation between the slits is 20 µm. A first-order constructive interference fringe appears at an angle of 2.5o from the zeroth order (central) fringe. A. What wavelength of light

*asked on October 25, 2017* -
## world history

How did the Renaissance contribute to the Age of Exploration? by emphasizing the importance of converting people to Christianity by awakening a spirit of discovery and innovation in Europe by fostering a belief in the importance of working as a group by

*asked on February 21, 2011* -
## physics

A sample of ideal gas is expanded to twice its original volume of 1.00 m3 in a quasi-static process for which P = áV2, with á = 2.50 atm/m6, as shown in the figure. How much work is done by the expanding gas? i tried using the eq:

*asked on October 15, 2008* -
## Math

A ferris wheel has a radius of 20m and the bottom is 2m above the ground. The wheel makes one rev in 40 sec. If the rider gets on at 30^0 on the left of the lowest point going downwards, wirte the sine function to show this movement

*asked on December 21, 2017* -
## computer code

Design a pseudocode for a program that accepts an ice cream flavor the price per gallon and number of gallons sold a year, display a message this flavor is the best seller having more than 40000 gallons a year sold

*asked on September 15, 2017* -
## Physics HELP!

The position of an object connected to a spring varies with time according to the expression x = (7.1 cm) sin (2.1π t). Find (a) the period of this motion (b) the frequency of the motion (c) the amplitude of the motion (d) the first time after t=0 that

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

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x))

*asked on May 26, 2013* -
## AP Calculus

Find the particular solution to y ' = 2sin(x) given the general solution is y = C - 2cos(x) and the initial condition y(pi/2) = 1

*asked on March 26, 2018* -
## physics

Two slits are 0.158 mm apart. A mixture of red light ( wavelength = 65 nm) and yellow green light (wavelength = 565 nm)falls on the slits. A flat observation screen is located 2.24 m away. What's the distance on the screen between the third order red

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

A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71¡ã W] and the second stone moves away at a velocity of 1.25 m/s [N44¡ã E], what was the

*asked on March 30, 2016* -
## Calculus

The table below shows the temperature (in °F) t hours after midnight in Phoenix on March 15. The table shows values of this function recorded every two hours. (10 points) a. Estimate the value of T'(6). Give units in your answer. b. What is the meaning of

*asked on May 15, 2015* -
## Stats

A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 3.5 ounces. After the redesign, the absorption amounts of a sample of sponges were (in ounces): 4.1, 3.7, 3.3, 3.5, 3.8, 3.9, 3.6,

*asked on April 29, 2012* -
## college physics

A 0.384 kg puck, initially at rest on a horizon- tal, frictionless surface, is struck by a 0.189 kg puck moving initially along the x axis with a speed of 2.7 m/s. After the collision, the 0.189 kg puck has a speed of 1.7 m/s at an angle of 28 to the

*asked on October 22, 2011* -
## Organic Chemistry

The following reaction would produce a(n) __________. R-OH + R'COOH →

*asked on May 3, 2010* -
## AP Calculus Help Five Questions

1. Find the particular solution to y " = 2sin(x) given the general solution y = -2sin(x) + Ax + B and the initial conditions y(pi/2) = 0 and y'(pi/2) = -2. 2. What function is a solution to the differential equation y ' - y = 0? 3. If dy/dx = cos^2(pi*y/4)

*asked on March 27, 2018* -
## art

this image was created by using basic math concepts that include all of the following except A)knowing how to create a pattern B)using understanding the angles of the shapes C) a basic understanding of different geometric shapes. D) applying appropriate

*asked on October 5, 2016* -
## Intro Physics - Newton's third rule

a piano mover raises a 1000 N piano at a constant speed using a very light rope in a frictionless pulley system. with what force is the mover pulling down on the rope? Show steps please! Thank you!

*asked on October 7, 2014* -
## statistics

Forty-four percent of customers who visit a department store make a purchase. The probability, rounded to four decimal places, that in a random sample of 9 customers who will visit this department store, exactly 6 will make a purchase is:

*asked on October 27, 2013* -
## math

The exchange rate of U.S. dollars to British pound's is .63 you have $4000 to convert to British pounds. How many British pounds will you receive?

*asked on May 27, 2012* -
## geometry

The diagonals of rhombus FGHJ intersect at point K. If side GH is equal to 3x - 10 and side JH is equal to 6x - 19, find x.

*asked on July 14, 2011* -
## Social Studies

What was the purpose of Hammurabi's Code

*asked on December 13, 2009* -
## Algebra

The ratio of the length to the width of a golden rectangle is (1 + √(5):2:.The dimensions of a garden form a golden rectangle. The width of the garden is 12 feet. Find the length L of the garden. Round your answer to the nearest foot.

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

Muscles are attached to bones by means of tendons. The maximum force that a muscle can exert is directly proportional to its cross-sectional area A at the widest point. We can express this relationship mathematically as F~max= σA, where σ (sigma) is a

*asked on March 6, 2016* -
## Calculus

For f(x)=(1-x)/(1+x) and g(x)=x/(1-x) , find the simplified form for f [g(x)] and state the domain

*asked on May 27, 2015* -
## Physics

How many joules of energy per kilogram of rest mass are needed to bring a spacecraft from rest to a speed of 0.77c?

*asked on September 14, 2014* -
## physics

A mass m at the end of a spring vibrates with a frequency of 0.87 Hz. When an additional 602 g mass is added to m, the frequency is 0.59 Hz. What is the value of m?

*asked on March 7, 2012* -
## pre-calculus

Graph each complex number. Then express it in rectangular form. 2(cos(4pi/3) + isin(4pi/3)) I don't understand where to go from here.

*asked on March 9, 2010* -
## Accounting

North Pole Cruise Lines issued preferred stock many years ago. It carries a fixed dividend of $6 per share. With the passage of time, yields have soared from the original 6 percent to 14 percent (yield is the same as required rate of return). A. What was

*asked on January 10, 2010* -
## chemistry

A chemist wishes to determine the concentration of CrO4-2 ions electrochemically. A cell is constructed consisting of saturated calomel electrode (SCE) and a silver wire coated with Ag2CrO4. The SCE is composed of mercury in contact with a saturated

*asked on May 27, 2008* -
## physics

Two small loudspeakers emit sound waves of the same amplitude and frequency in phase with each other. The waves produce an interference pattern such that the distance from the right bisector to a point P on the third nodal line is x3. The wavelength of the

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

A 8.5 L sample is collected at 45 degrees C. What will the volume be if the temperature is raised to 70 degrees C.

*asked on August 19, 2014* -
## calculus help

Does the function satisfy the hypotheses of the Mean Value Theorem on the given interval? f(x)= ln(x) , [1,6] If it satisfies the hypotheses, find all numbers c that satisfy the conclusion of the Mean Value Theorem. (Enter your answers as a comma-separated

*asked on April 16, 2014* -
## Physics

What is the maximum theoretical efficiency of a steam engine operating between 60°C and 410°C?

*asked on June 27, 2012* -
## Math

Simultaneous equation and surds 5x-3y=41 (7route2)x+(4route2)y=82

*asked on October 2, 2010* -
## chemistry

A 0.821 sample of a substance composed of diatomic molecules has a mass of 131.3g. Identify this molecule. May I have your expert help with this question? Thank you.

*asked on April 22, 2010* -
## statistics

A statistics practitioner would like to estimate a population mean to within 50 units with 99% confidence given that the population standard deviation is 250. a) What sample size should be used. b) Repeat part (a) with a standard deviation of 50. c) Repeat

*asked on March 13, 2010* -
## spelling

how do you make a spelling triangle

*asked on August 31, 2011* -
## what is the difference

what is the difference between 14kt gold and 14k gold and what one is the better gold Both are the same thing Thank you for using the Jiskha Homework Help Forum. In addition to the answer you already have, look what might happen if you don't distinguish

*asked on February 26, 2007* -
## math

You are given 5 to 4 odds against tossing three heads with three coins, meaning you win $5 if you succeed and you lose $4 if you fail. Find the expected value (to you) of the game. Would you expect to win or lose money in 1 game? In 100

*asked on December 11, 2019* -
## Algebra

Write an absolute value inequality to fit the graph below: There is a Number line with 14 on the left and 26 on the right with solid dots on both.

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

A similie , metaphor (etc) for relief??

*asked on March 31, 2017* -
## Math

What is the volume of a cereal box that is 2 inches thick, 12 inches high and 10 inches wide?

*asked on April 22, 2016* -
## PHYSICS!!!!

It is 5.0 km from your home to the Physics lab and your car is out of gas. You could run that distance at 10 km/h, which uses up energy at the rate of 700 W; or you could walk it leisurely at 3.0 km/h, which uses energy at 300 W. (a) Calculate how much

*asked on April 4, 2016* -
## Calculus

The function's value will always be greater than or equal to the local linear approximation of a function f if, for all x in an interval containing the point of tangency, f " > 0 f " < 0 f ' > 0 f ' < 0

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

The first two terms in a geometric series is 12. The sum of the first three terms of the same series is 62. Determine the first four terms of the series.

*asked on January 8, 2014* -
## Physics

A crowbar is 4.000 metres long and has its pivot 50.000 centimetres from one end. A force of 2000.000 newtons is applied to the end closest to the pivot. What effort must be applied to the other end of the crowbar to keep it in equilibrium? (Round to 3

*asked on November 1, 2013* -
## physics

In the apparatus shown in the figure (Figure 1) , m1 = 10kg and the coefficients of static and kinetic friction between m1 and the table are 0.69 and 0.32, respectively. Part A What mass of m2 will just barely set the system in motion?

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

A charged particle is projected into a uniform B-field. Its velocity vector is perpendicular to the B-field vector. What type of path will the particle travel? Neglect gravity. Answer straight line motion elliptical motion parabolic motion circular motion

*asked on July 16, 2013* -
## physics

A small cylinder rests on a circular turntable that is rotating clockwise at a constant speed. The cylinder is at a distance of r = 12 cm from the center of the turntable. The coefficient of static friction between the bottom of the cylinder and the

*asked on July 10, 2013* -
## statistics

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x))

*asked on May 26, 2013* -
## physics

the coefficients of static and kinetic friction for stone on wood are, respectively, 0.5 and 0.4. if a 150 kg stone statue is pushed with just enough force to start moving across a wooden floor and the same force continues to act afterward. find the

*asked on November 7, 2012* -
## physics

For a glass lens submerged in water (n=1.33), the critical angle of incidence at which total internal reflection begins to happen is 60.1 degrees. What is the index of refraction of the glass?

*asked on November 2, 2012* -
## Algebra 2

Abelardo wants to create several different 7-character screen names. He wants to use arrangements of the first 3 letters of his first name(abe, followed by arrangements of 4 digits in 1984, the year of his birth. How many different screen names can he

*asked on April 16, 2012* -
## chem 2

What is the pH of a solution that consists of 0.50M H2C6H6O6(ascorbic acid) and 0.75M NaHC6H6O6(sodium ascorbate)? for ascorbic acid, Ka=6.8x10-5

*asked on March 3, 2012* -
## Stats

Explain how to calculate margin of error. What effect does increasing your sample size have on the margin of error? What effect does it have on the confidence level? What effect does it have on the confidence interval?

*asked on March 2, 2012* -
## Maths

Calculate speed give your answers in km/p hour Distance = 18 KM Time = 12 minutes S - T

*asked on November 6, 2011* -
## statistics

The average score on a standardized test is 500 points with a standard deviation of 50 points. What is the probability that a student scores between 450 and 600 on the standardized test?

*asked on July 21, 2011* -
## chemistry

. Given the following stocks 4M NaCl, 3M NaOH, 5M HCl (a) Prepare 200ml of a solution containing 0.5M NaCl and 0.1M (b) Prepare 300ml of a solution containing 0.5M NaCl (c) Prepare 200ml of a solution containing 0.5M NaCl and 0.1M HCl

*asked on April 15, 2011* -
## physics

A rifle that shoots bullets at 460 m/s is to be aimed at a target 47.0 m away. If the center of the target is level with the rifle, how high above the target must the rifle barrel be pointed so that the bullet hits dead center? (Neglect air resistance.)

*asked on November 3, 2010* -
## physics

Is it possible to calculate the torque acting on a rigid body without specifying the origin?

*asked on October 9, 2009* -
## Math

The perimeter of a rectangle is 90 units the base is 3z and the side is 4z+3 what is the length

*asked on November 27, 2019* -
## Physics

A 72 kg bungee jumper jumps from a bridge. She is tied to a bungee cord whose unstretched length is 12 m , and falls a total of 35 m . Calculate the maximum acceleration she experiences.

*asked on December 11, 2017* -
## chem

The noble has configuration for Ta is [Xe] 6s2 4f14 5d3 does the order in which i arrange the principle energy levels matter when i write the configuration? Like should it be [Xe] 5d3 6s2 4f14

*asked on November 10, 2016* -
## Computer Science

Write a program that Will prompt a user to enter his/her name and number.use a while loop that will display the user name times the entered number

*asked on October 27, 2016* -
## honors chem

naturally occurring boron is 80.20% boron 11 (atomic mass= 11.01amu) and 19.80% of some other isoptopic form of boron. what must the atmoci mass be be in order to account for the 10.81 amu averafe atomic mass of boron? round to two decimal places i got

*asked on October 17, 2016* -
## computer science

QUESTION 1 When using the OR logical operator to connect 2 conditions to create a complex Boolean expression, neither the first condition nor the second condition has to be true for the complex Boolean expression to be true. True False QUESTION 2 String

*asked on June 18, 2016* -
## economics

Part 1 A firm has the current liabilities and equity financing on its balance sheet. The firm has taxable income that puts it in a 38% federal tax bracket, and the state in which it operates levies a 6.5% income tax. Compute the firm’s weighted average

*asked on April 25, 2016* -
## PHYSICS!!

Two basketball players collide head on. play a weighs 80 kg and is travelling 2.5m/s to the right while player b weighs 68 kg and is travelling 1.2 m/s to the left. after collision player a is travelling at 1.0 m/s to the right. a. what is the change in

*asked on April 10, 2016* -
## physics

Question: You live at the top of a steep (a slope of ???? degrees above the horizontal) hill and must park your 2200 kg car on the street at night. a) You unwisely leave your car out of gear one night and your handbrake fails. Assuming no significant

*asked on February 29, 2016* -
## Calculus

The position function of a particle in rectilinear motion is given by s(t) s(t) = t^3 - 9t^2 + 24t + 1 for t ≥ 0. Find the position and acceleration of the particle at the instant the when the particle reverses direction. Include units in your answer.

*asked on May 18, 2015* -
## Math

A monopoly has a total cost function C = 1000 + 108x + 12x^2 for its product, which has demand function p = 324 − 3x − 2x^2. Find the consumer's surplus at the point where the monopoly has maximum profit. (Round your answer to the nearest cent.)

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

If the total cost function for producing x lamps is C(x) = 90 + 36x + 0.1x^2 dollars, producing how many units will result in a minimum average cost per unit? PLEASE EXPLAIN YOUR WORK Thank you

*asked on March 9, 2015* -
## pacific rim

Mrs Garcia had 2/3 of a pumpkin pie left.Her sons at 3/8 of what was left. What fraction of the whole pie did her sons eat? 2/3*3/8=6/24

*asked on January 7, 2015* -
## Physics

A box of mass 1.50 kg is given an initial velocity of 12.5 m/s up an inclined ramp that makes an angle of 25.0o with the ground, which is horizontal. The coefficient of kinetic friction between the box and the ramp is 0.240. How long does the box slide up

*asked on May 13, 2014* -
## English/Mythology

What is ironic about the death of Jason and Theseus from Greek mythology

*asked on May 4, 2014* -
## Math

Jerrod's bike has a tire diameter of 26 inches. How far will the bike travel in 100 rotations of its tires?

*asked on January 29, 2014* -
## biology

draw a diagram that shows the chromosome combinations that are possible in the haploid gametes of an organism with a diploid number of 6

*asked on January 15, 2014* -
## math

What is the value of t in the solution to this systems of linear equations? 2s – 3t = –1 3s – 4t = 0 a)–5 b)3 c)-7/3 d)4

*asked on April 2, 2013* -
## math

A box with an open top is to be constructed from a rectangular piece of cardboard with dimensions W inches by L inches by cutting out equal squares of side x at each corner and then folding up the sides. (W = 12 in. and L = 20 in). Find the values of x for

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

EXPLAIN HOW YOU CAN BREAK 6X7 ARRAY IN TO SMALLER ARRAYS .WHAT ARE THE NEW FACTS?

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

Suppose you have a very long straw that can reach from a cup of water on the ground level to the top of a very tall building. When you use a pump to suck on the straw in order to bring water up, a. you can bring the water up to any height with no problem.

*asked on January 18, 2013* -
## Algebra

help me solve this equation by substitution. y^2− 4x^2 = 7 9y^2+16x^2 = 323

*asked on November 9, 2012* -
## pennfoster

Which of the following sentences contains a verb in the simple past tense? A. I was working overtime for about six months. B. She would like to join us. C. We helped Joan to pack her things. D. Jenna has driven this route multiple times

*asked on February 15, 2012* -
## Chemistry

a real gas would behave most like an ideal gas under conditions of

*asked on November 18, 2011*