# John

Newest questions and responses by John-
## Physics

A velocity selector is built with a magnetic field of magnitude 5.2 T and an electric field of strength 4.6 × 10 ^4 N/C. The directions of the two fields are perpendicular to each other. At what speed will electrons pass through the selector without

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

Jane is organizing a fundraiser to buy a ping-pong table for the community center. The table costs $500.00. Jane is asking contributors to pay for an equal share of the cost of the table. She already has five contributors lined up. What function models the

*asked on February 7, 2019* -
## math

1/2x+1/3y=5 sub 1/4x+y=0

*asked on February 4, 2019* -
## math

The population of a southern city follows the exponential law. If the population doubled in size over 28 months and the current population is 70 comma 000, what will the population be 4 years from now?

*asked on January 28, 2019* -
## Art

A curator decides to display an eighteenth-century painting in a windowless room with controlled temperature and humidity. Pick the answer that best describes the reasons for her choice: A. The curator wants to make sure that the temperature and humidity

*asked on January 28, 2019* -
## Chemistry

Calculate the number of mole of CaCl2 obtained from 25g of limestone CaCO3 in the pressure of excess HCl (C=,12, O=16, Cl=35.5)

*asked on January 14, 2019* -
## arkansas history

where are the major cities located

*asked on January 8, 2019* -
## Math

3/8 + 1/5 = __

*asked on December 20, 2018* -
## Physics

A 94.0kg fullback moving south with a speed of 5.1m/s has a perfectly inelastic collision with a 90.0kg opponent running north at 3.0m/s. A. Calculate the velocity of the players just after the tackle. B. Calculate the decrease in total kinetic energy

*asked on December 17, 2018* -
## Maths

2 Similar Cups are 3cm&5cm deep,if larger Cup holds 625cm cube of water,find smaller cup Volume

*asked on December 7, 2018* -
## English

1. Early in Act II of The Phantom Tollbooth, Milo meets a character named Kakafonous A. Dischord, Doctor of Dissonance. Stage directions tell you that "Two screeches and a bump are heard." The doctor's name and the stage directions are clues to the

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

Bob is driving along a straight and level road towards a mountain. At some point, he measures the angle of elevation to the top of the mountain and finds it to be 22.5 degrees. He then drives 1 mile (5280 ft) and measures the angle of elevation to be 34.4

*asked on November 29, 2018* -
## Math-precalc

Compute or solve the following in radians without a calculator a. csc x=2, pi/2 ≤ x ≤ pi b. cot x= -1 , 3pi/2 ≤ x ≤ 2pi Thanks!

*asked on November 29, 2018* -
## physics

m1 = 2.3 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 45 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with

*asked on November 23, 2018* -
## Math

D is partly constant and partly varies with y.when y=6,x=9.Find the relationship between xandy.Find x when y=4.

*asked on November 21, 2018* -
## Ed Tech

Which of the following strategies might be useful when organizing items in your study area? Put everything in one big bin so it is easy to clean up It is important to spend a lot of money on fancy organizational containers. Once you organize your desk, you

*asked on November 14, 2018* -
## Math

Lincoln School is having a fundraising contest. Each student is to design a school poster. The designs are to be made to fit a rectangle that is 12 cm by 16 cm and then dilated by a scale factor of 3. What will be the perimter and area of the final poster?

*asked on November 13, 2018* -
## science

A projectile is fired horizontally from a gun that is 45.0m above flat ground, emerging from the gun with a speed of250m/s. Calculate the amount of time taken by the projectile in the air?

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

A screw jack has 90 threads tothe metre. the effort is applied at the end of an arm 20cm long whatforce must be applied to lift a load of 150N ?

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

2. A baseball starts from rest and rolls 50.0 m down a hill in 10.0 seconds. What is the acceleration?

*asked on November 7, 2018* -
## Math

State an equation of a rational function that satisfies the given conditions: vertical asymptote at x=5, horizontal asymptote at y=-3, and x-intercept is 5/2. Need help solving.

*asked on November 5, 2018* -
## Civic education

Four ways in which leaders can protect the interest of their followers

*asked on November 4, 2018* -
## Math

Granda's soup company packages soup that serves 4 in cylindrical cans having a base diameter of 8cm and a height of 10cm. It wants to introduce the soup in single serving cans. If the company keeps the height of the new can at 10cm, what should its new

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

Mr Smith paid $30,000 for a rectangular lot 1,200 feet wide and 1,600 feet long. What is the approximate cost per square foot? Please show work so I can understand the problem... Thank you

*asked on November 3, 2018* -
## Math - Algebra

What is the value of the greatest of four consecutive integers if the least minus twice the greatest equal 8? Please show the work so I can understand how to complete the problem - thank you

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

cosA = 1/8 with A in QIV, find cscA/2

*asked on November 1, 2018* -
## civic

how can leaders protect the right of their followers

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

a stone is projected at an angle of 60decree an and initial velocity of 20msper seconds. determine the time of the flight

*asked on October 26, 2018* -
## differential algebra

The fraction of a cohort of AIDS patients that survives a time t after AIDS diagnosis is given by S(t) = e^(-kt). Suppose the mean survival for a cohort of hemophiliacs diagnosed with AIDS before 1986 was found to be T (avg) = 6.4 months. What fraction of

*asked on October 25, 2018* -
## maths

A tree casts a shadow of 34 feet at the time when a 3-foot tall casts a shadow of 1.7 feet. what is the height of the tree?

*asked on October 23, 2018* -
## Chemistry

What is the mass in grams of copper chloride dihydrate (CuCl2·2H2O) required to prepare 80.0 mL of a 0.10 M CuCl2 solution?

*asked on October 20, 2018* -
## Cell Biology

Note on the complexity of structural and functional organization in eukaryotic nucleus (7 marks)

*asked on October 14, 2018* -
## Math

Determoine the cubic function with zeros -2, 3, and 4 and F(5) = 28

*asked on October 14, 2018* -
## Physics - Optics

An incident beam strikes a prism with a small angle of 20 degrees (the light enters perpendicular to the prism but the other side of the prism is slanted 20 degrees). The microwave signal is maximized when the receiver makes an angle of θ = 7 degrees

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

two cars approach a crossroad 36.0m ahead. Car A is traveling east at 9.00m/s and car B is traveling south at 12.0m/s. What is the location of car B relative to car A?

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

In the experiment, you will study a torsion pendulum and compare the periods of a suspended sphere and of a suspended cube. The rotational inertia of a sphere is Is = 1/10(MsD^2), where Ms is the mass of the sphere and D is its diameter. The rotational

*asked on October 10, 2018* -
## physics

A dart is being thrown at a board that is 3.40 m away. When it hits the board it is 0.784 m below the point where it was aimed and it was thrown at 8.50 m/s. How long was the dart in the air?

*asked on October 10, 2018* -
## physics

You are playing catch with your sibling in your backyard. If you toss a ball at 15.0 m/s at an angle of 24.0° and your sibling catches it at the same height, what is the maximum height above where it was thrown?

*asked on October 10, 2018* -
## physics

You are thinking about taking gymnastics, so you go to the facility and get an idea of what to expect by looking out from the viewing room. The viewing room window is 4.30 m above the trampoline directly below, so it is perfect for viewing the the

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

You are thinking about taking gymnastics, so you go to the facility and get an idea of what to expect by looking out from the viewing room. The viewing room window is 4.30 m above the trampoline directly below, so it is perfect for viewing the the

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

While standing on top of a 220. m tall building, you see Iron Man flying straight down toward the ground at a speed of 30.0 m/s. Just as he passes you, you drop a can of Dr Pepper off the roof. How fast is the can going when it passes Iron Man?

*asked on September 27, 2018* -
## Calculus

From what you know about the graphs of functions (i) through (v), pick out the one that is the derivative of f for x>0. Show your work. f(x)=x ln x-x i. y=sin x ii. y=ln x iii. y= x^(1/2) iv. y=x^2 v. y=3x-1

*asked on September 25, 2018* -
## Language Arts

Im having trouble filling in this question "You had no right to call me clumsy ____________ just because i spilled some water on you" Fill This In

*asked on September 10, 2018* -
## physics

A man whose mass is 80kg stands on a spring weighing machine inside an elevator. What is the readingof the weighing machine when the elevator starts to ascend with an acceleration of 2ms seque. the elevator is moving with a uniform velocity, the elevator

*asked on August 25, 2018* -
## physics

A man whose mass is 80kg stands on a spring weighing machine inside an elevator. What is the readingof the weighing machine when

*asked on August 25, 2018* -
## Science

Which of the following is a valid reason to study science A. All in employees require a in depth knowledge of science. B. Carrying out scientific experiments is a requirement to every day life. C. Most colleges require advanced science classes D.

*asked on August 24, 2018* -
## Math

If the shadow of a x metre tall tree is broken up in the middle and touches the top of the tree on the ground at a particular distance from the ground.calculate the image distance?

*asked on July 22, 2018* -
## history

what common characteristics did John Smith and Anne Hutchinson display in their quest to save a colony or the souls of their fellow Christians？

*asked on July 18, 2018* -
## English check my answers please

anyone familiar with the play the merchant of venice by william Shakespeare please check my answers 1.which of the following elements of comedy are not used by Shakespeare in in the merchant of venice? a.a clown like character b.puns c.slapstick d.clever

*asked on July 16, 2018* -
## World history

Which temporary solution was adopted in 1924 to address the economic problems caused by Germany's inability to make reparations? A-Versailles plan B-Marshall plan C-Dawes plan D-young plan B?

*asked on July 13, 2018* -
## English

In defence of free floating affixes state four arguments

*asked on July 12, 2018* -
## World history

What was an impact of the United States entry into World War 1? A-the arrival of fresh troops to the allied side forced Germany to agree to cease-fire within a year. B-Britain shifted most of its troops to the eastern front because they were no longer

*asked on July 11, 2018* -
## Chemistry

If a 3.9 lb ball of aluminum is coated with a 644 micrometer layer of gold, what is the density (in g/mL) of the gold-coated aluminum ball? The densities of aluminum and gold are 2.70 g/mL and 19.32 g/mL, respectively. Type your numerical answer to 2

*asked on July 1, 2018* -
## Physical Chemistry

The Li2+ ion is hydrogenic and has a Lyman series at 740747 cm-1, 877924 cm-1, 925933 cm-1,and beyond. Show that the energy levels are of the form –hcR/n^2 and find the value of R for this ion. Go on and predict the wavenumbers of the two longest

*asked on June 27, 2018* -
## science

A steel block weighing 12N is pulled up an incline plane 20° above the horizontal by a constant force of 7.35 N which makes an angle of 10° above the inclined plane. The block stars from rest and is pulled 2.0m along the inclined plane. the coefficient

*asked on June 20, 2018* -
## math

if you have a 6 foot canvas and cut off 4 inches then how many feet would be left

*asked on June 14, 2018* -
## Science

Can someone explain grade 9 biology translation and transcription for me? My teacher doesnt explain it well. I cannot understand it at all. Detailed description please and easy to understand.

*asked on June 13, 2018* -
## Trig/Algebra 2

The following table of values compares national test scores to high school GPA at a certain school. National Test Score HS GPA 2350 3.95 1900 3.20 1825 2.00 2270 3.00 500 1.50 2000 4.00 1550 2.50 1030 1.17 1665 2.85 1380 2.25 2220 3.60 Using the equation

*asked on June 10, 2018* -
## Social Studies

3. How did the grand coulee dam change economic activity in Washington? A. it encouraged the growth of new, water-intensive farming. B. it promoted a shift away from manufacturing toward extractive industries. C.it reduced the amount of arable land

*asked on June 7, 2018* -
## Algebra

$3000 invested at an apr of 5% for 7 years

*asked on June 7, 2018* -
## Maths

solve using cramer's rule 3m+2n=10 and m+2n=4

*asked on May 27, 2018* -
## Math

I don't know how to solve this equation. cos(30) = x / 6 How would I solve this to find the missing side of a 30-60-90 triangle?

*asked on May 25, 2018* -
## Sociology

What role does culture play in society?

*asked on May 19, 2018* -
## Sociology

Provide examples of any societal dangers that might occur when the results of poor research are publicized.

*asked on May 18, 2018* -
## science

what does 4s^2 mean

*asked on May 12, 2018* -
## science

A coastline on Earth experienced a high tide at 6 a.m. At what approximate time will the next low tide occur, and why? 6 p.m., because the coastline will turn 90 degrees from the moon 6 p.m., because the coastline will turn 180 degrees from the moon 12

*asked on May 10, 2018* -
## Math

How do you find the product of 15 × 3 1/5 using distributive property?

*asked on May 2, 2018* -
## Chemistry

If 50.0 mL of a 1.00 M solution of CaCl2 (solution A) is mixed with 85.0 mL of pure water to produce solution B and then 42.5 mL of solution B is mixed with 52.0 mL of solution A to give solution C, what is the concentration of CL^-(aq) in the final

*asked on April 29, 2018* -
## science

two forces,80N and 100N acting at an angle of 60° with each other,pull on an object what single force would replace the two forces

*asked on April 29, 2018* -
## Trig

rewrite in polar form x^2+y^2-6y-8=0 r^2=6r+6sin theta +8 r^2=6rsin theta +8 r^2=6r+6cos theta +8 r^2=6r cos theta +8

*asked on April 26, 2018* -
## Trig

rewrite in polar form x^2+y^2-6y-8=0 Please help totally don’t et this :/

*asked on April 26, 2018* -
## Math

Let R denote the region in the first quadrant bounded above by the line y 1 and below by the curve y -3, 0 3 x < 1. Find the centroid of the region R. You may use your calculator to evaluate any definite integrals invol ved.

*asked on April 26, 2018* -
## math

A charity raffle offers a first prize of $1,000,000, a second place prize of $100,000 and a third place prize of $10,000. A total of 500 000 tickets will be sold. What price should be charged for a ticket in order for the charity to make a 60% profit on

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

The region R is bounded by the x-axis, x = 1, x = 3, and y = 1/x3. a.) Find the area of R. b.) Find the value of h, such that the vertical line x = h divides the region R into two Regions of equal area. c.) Find the volume of the solid generated when R is

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

If sin a=0.31 cos a=0.95 sin b=0.47 and cos b=0.88 what is sin (a+b)? 0.78 -0.17 0.98 0.72

*asked on April 23, 2018* -
## Algebra

6 YEARS AGO, JOE WAS 2 YEARS MORE THAN 5 TIMES AS OLD AS HIS DAUGHTER. SIX YEAS FROM NOW, HE WILL BE 11 YEARS MORE THAN TWICE AS OLD AS SHE WILL BE. HOW OLD IS JOE?

*asked on April 18, 2018* -
## Algebra

Solving using 2 equations in two variable: Jason bought a total of 7 postcards for 1.80. If small cost 20 cents and the large ones cost 30 cents, how many postcards of each size did he buy?

*asked on April 18, 2018* -
## chemistry

A narrow ray of yellow light from glowing sodium (λ0 = 589 nm) traveling in air strikes a smooth surface of water at an angle of θi = 40.5°. Determine the angle of refraction θr.

*asked on April 15, 2018* -
## Physics

A narrow ray of yellow light from glowing sodium (λ0 = 589 nm) traveling in air strikes a smooth surface of water at an angle of θi = 40.5°. Determine the angle of refraction θr.

*asked on April 15, 2018* -
## Math

Which does the Y intercept this function represent Y equals 2+ 4X

*asked on April 9, 2018* -
## Chemistry

How many grams of a sodium salt would you need to prepare 500 ml of a buffer at pH = 3.29, using 0.100M solution. (Use 3 sig fig , atomic wts to whole number)

*asked on April 9, 2018* -
## Geometry

Determine center of circle that contains the points (4,1), (-3,7), and (5,-2)

*asked on April 4, 2018* -
## Trig

A telephone pole that is 14ft y’all has fallen against a house. If the top of the telephone pole touches the house 8ft. Above the ground, what is the angle that the telephone pole makes with the ground? Stuck on this question on my quiz not sure how I

*asked on March 29, 2018* -
## Algebra 1

2 jets leave airport at 3pm, one traveling east other west. The westbound jet averages 625km/h and the eastbound jet 825 km/h. At what time will the jets be 725 apart?

*asked on March 28, 2018* -
## Algebra 1

A train went 210 miles further than a bus. The train went four times further than the bus. how far did each vehicle travel?

*asked on March 28, 2018* -
## Economics

Banks create money whenever they: A: accept a deposit. B: receive monthly payments on their loans. C: receive interest on existing loans. D: lend excess reserves to a borrower.

*asked on March 28, 2018* -
## Math

Which is likely to have a mass close to 2 kilograms A.a grown elephant B.a pineapple C.a 3-year old child** D.an acron

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

Suppose an obstruction in an artery reduces its radius by 16%, but the volume flow rate of the blood in the artery is remains the same. By what factor has the pressure drop across the length of this artery increased?

*asked on March 23, 2018* -
## Java Programming

Add 2 constructors to the Course class. One that takes no arguments and initializes the data to all 0’s and “” (empty strings). And one constructor that takes all 4 arguments, one argument for each property and then sets the properties to these

*asked on March 17, 2018* -
## History

Hi, so I have this question. The growing popularity of newspapers, magazines, and books in the United States during the 19th century contributed to which of these? The emergence of a uniquely American literary style The expansion of educational

*asked on March 12, 2018* -
## Math

Solve the following equation =0.017=2x^2/(0.0550-x)(0.165-x). I was told it was 0.00196. But I got like 0.00247. Is 0.00196 correct?

*asked on March 12, 2018* -
## Statistic

Calculate the following probabilities (to 2 decimals) using the table of joint probabilities. A1 A2 B1 .4 .3 B2 .2 .1 a. P(A1|B2) = b. P(B2|A1) = c. Did you expect the answers to Parts (a) and (b) to be reciprocals? That is, did you expect that P(A1|B2) =

*asked on March 11, 2018* -
## Chemistry

Sorry for postiong twice. But I really need to know if the answers I am getting are correct; Nitrogen and oxygen react to produce nitric oxide according to the following equation: N2 (g) + O2 (g) → 2 NO (g) The equilibrium constant for this reaction is

*asked on March 10, 2018* -
## Chemistry

The compound NOCl decomposes to nitric oxide and chlorine according to the following equation: 2 NOCl (g) → 2 NO (g) + Cl2 (g) Suppose that 0.550 mol NOCl is placed in a 2.00-L flask at a given temperature. When equilibrium has been established, it is

*asked on March 10, 2018* -
## S.S

In the election of 1856, Millard Fillmore was the Know-Nothing candidate and received 21 percent of the popular vote. What conclusion could be drawn from this fact? A. A significant number of people opposed slavery. B. A significant number of people were

*asked on March 7, 2018* -
## S.S

5. The Underground Railroad used escape routes that went throughout the South. Based on that fact, which of the following conclusions could be made? (1 point) A. The Southern states were leaning toward emancipation of the slaves. B. Slaves were hopeful to

*asked on March 7, 2018* -
## Trigonometry

A pilot wants to maintain a course of 40° and a ground speed of 300 mph against a 45 mph wind from 20° west of north. What should his heading be?

*asked on March 7, 2018* -
## Trigonometry

a small blimp has an air speed of 24km/h on a heading of 42°. The wind's speed is 9 km/h and its direction is 312°. Find the ground speed and drift angle of the blimp.

*asked on March 7, 2018* -
## Trigonometry

An airplane is traveling at 650 mph on a heading of 255°. The wind is blowing from a bearing of 320° at 28 mph. What is the ground speed and the actual bearing of the airplane? P.S. I prefer the law of cosine/sine method

*asked on March 6, 2018* -
## Trigonometry

An airplane with a speed of 485 km/h is traveling with a heading of 83.5°. The wind velocity is 38 km/h in the direction of 191°. Find the ground speed of the airplane. P.S. How do you solve this problem by only using the law of cosine/sine method?

*asked on March 6, 2018*