# noah

Most popular questions and responses by noah-
## Social studies

“What kind of arrangement is agreed to in this contract?”

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

using substitution how to solve x + 4y = 8 2x + 5y = 29

*asked on December 3, 2012* -
## physic

Superman must stop a 120km/h train in 150m to keep it from hitting a stalled car on the tracks.If the train's mass is 3.6x10^5kg,how much force must he exert?Compare to the weight of the train (give as%).How much force does the train exerts on Superman?

*asked on July 2, 2011* -
## history

Which pull factor would most likely encourage an immigrant who wanted to raise and sell cattle in the United States A)industrial jobs B)inexpensive land C)the promise of freedon D)expensive land in home country

*asked on April 3, 2018* -
## Physics

1)We consider a hot-air balloon of mass 251 kg (basket and envelope). The spherical envelope of the balloon has a diameter of 19 m when fully inflated. To what temperature (in °C) must the enclosed air be heated for the balloon to carry five standard men?

*asked on December 2, 2016* -
## history

Explain why Lincoln's assassination put the future of the nation in question.

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

the neuron that transmit the signal to your foot to kick a soccer ball are called reflexes motor neurons sensory neurons interneurons

*asked on September 24, 2014* -
## Business Statistics

Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and prepreview ads before the movie starts. Many complain that the time devoted to previews is too long (The Wall Street Journal,

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

If the density of ethyl alcohol is 0.789 g/mL, how many quarts can be produced by the fermentation of 100.0 lb of sugar?

*asked on November 3, 2014* -
## Chemistry

Consider the following description of a voltaic cell: A 1.0 M solution of Ni(NO3)2 is placed in a beaker with a strip of nickel metal. A 1.0 M solution of SnSO4 is placed in a second beaker with a strip of Sn. The two beakers are connected byba salt bridge

*asked on April 12, 2015* -
## PreChem

Classify each of the reactions. precipitation, acid-base neutralization, redox C2H4(g)+3O2(g)----> 2CO2(g)+2H2O(l) Cu(s)+FeCl2(aq)---->Fe(s)+CuCl2(aq) HI(aq)+LiOH(aq)---->H2O(l)+LiI(aq)

*asked on June 18, 2015* -
## Biology

How did Mendel's novel approach contribute to his success in describing how traits are inherited?

*asked on February 1, 2008* -
## physics

A 0.67 kg rock is projected from the edge of the top of a building with an initial velocity of 11.6 m/s at an angle 52 ◦ above the horizontal. Due to gravity, the rock strikes the ground at a horizontal distance of 19.5 m from the base of the building.

*asked on September 2, 2012* -
## science

the neuron that transmit the signal to your foot to kick a soccer ball are called reflexes motor neurons sensory neurons interneurons

*asked on September 24, 2014* -
## algebra

Complete the table below to solve the equation 2.5x − 10.5 = 64(0.5x). x f(x) = 2.5x − 10.5 g(x) = 64(0.5x) 2 3 4 5 6

*asked on December 7, 2015* -
## physics

A 605-kg racing car completes one lap in 14.3 s around a circular track with a radius of 40.0 m. The car moves at constant speed. (a) What is the acceleration of the car? (b) What force must the track exert on the tires to produce this acceleration?

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

A cannon ﬁres a 0.639 kg shell with initial velocity vi = 10 m/s in the direction θ = 55 ◦ above the horizontal. The shell’s trajectory curves downward because of gravity, so at the time t = 0.217 s the shell is below the straight line by some

*asked on September 2, 2012* -
## college physic SHM

A 1.25kg mass stretches a vertical spring 0.215m.If the spring is stretches an additional 0.130m and released, (a)how long does it take to reach the equilibrium position again? (b)Write an equation giving its position y as a function of time t. (c)What

*asked on July 26, 2011* -
## physic

Superman must stop a 120km/h train in 150m to keep it from hitting a stalled car on the tracks.If the train's mass is 3.6x10^5kg,how much force must he exert?Compare to the weight of the train (give as%).How much force does the train exerts on Superman?

*asked on July 2, 2011* -
## Physics

A rocket that weighs 7840 N on earth is fired. The force of propulsion is + 10 440N. Determine a) the mass of the rocket, b) the acceleration of the rocket, c) the velocity of the rocket at the end of 8.0 s.

*asked on September 26, 2017* -
## college physic

Determine a formula for the change in surface area of a uniform solid sphere of radius r if its coefficient of linear expansion is alpha A (assume constant) and its temperature is changed by Delta T.Assume the temperature chan ge is not large, Delta T^2 ~

*asked on February 7, 2012* -
## chem 2

a buffer is to be prepared by adding solid sodium acetate to 0.10M CH3COOH. Which othe following concentrations of sodium acetate will produce the most effective buffer? A. 3.0M CH3COONa B 2.5M CH3COONa C 2.0M CH3COONa D 1.5M CH3COONa E .30M CH3COONa HELP

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

Ammonia (NH3) react with oxygen (O2) to produce nitrogen monoxide (NO) and water (H2O). Write and balance the chemical equation. How many liter of NO are produced when 2.0 liters of oxygen reacts with ammonia?

*asked on December 10, 2018* -
## algebra

Rearrange the formula KE = 1/2 mv^2 for m

*asked on October 3, 2017* -
## 4th grade

Teresa has 4 flower pots in 4 different designs. How many different ways(positions) can she display her flowers?

*asked on September 22, 2009* -
## geography

what will be the loca time in nigeria longitude 15 degree east,when it is 5.00pm in ethiopia,longitude 45 degree east.

*asked on February 17, 2019* -
## Physics

An organ pipe that is open a t both ends has a fundamental frequency of 382 Hz. What is the length of an closed end pipe that has a fundamental frequency exactly one octave higher? Report your answer in m.

*asked on May 3, 2016* -
## AP Physics

To test the performance of its tires, a car travels along a perfectly ﬂat (no banking) circular track of radius 120 m. The car increases its speed at uniform rate of at ≡ d |v| dt = 2.99 m/s 2 until the tires start to skid. If the tires start to skid

*asked on October 24, 2012* -
## AP Physics

A baseball is thrown at an angle of 25 ◦ relative to the ground at a speed of 27.6 m/s. The ball is caught 59.4844 m from the thrower. The acceleration due to gravity is 9.81 m/s 2 . How long is it in the air? Answer in units of s

*asked on September 10, 2012* -
## PHYSICS

Assume: A 78 g basketball is launched at an angle of 46.7 ◦ and a distance of 18.6 m from the basketball goal. The ball is released at the same height (ten feet) as the basketball goal’s height. A basketball player tries to make a long jump-shot as

*asked on September 2, 2012* -
## History

I need help describing the social, economic, and political composition of the decade of corporate greed and how it affected the political climate of the 1980s. What does the question refer to when it mentions political climate?

*asked on July 27, 2008* -
## Math

Write the ratio in simplest form. 50:10 A.25:5 B.10:2 C. 5:1 D.1:5 Is the answer C?

*asked on October 28, 2016* -
## Half-Life

Uranium-238 decays to Lead-206. The half life of Uranium-238 is 4.5 billion years. If you have a 100 g sample. How much sample will you have after 2 half lifes?

*asked on February 19, 2012* -
## Math

The line 2x+3y=1 intersects the curve x(x+y)=10 at A and B. Calculate the coordinates of A and B.

*asked on May 23, 2011* -
## Chemistry

2Na + 2H2O = 2NaOH + H2 Calculat the moles and volume of hydrogen produced when 0.2 moles of sodium reacts with excess water.

*asked on May 29, 2011* -
## college physic

A stunt driver wants to make his car jump over 8 cars parked side by side below a horizontal ramp.(a)With what minimum speed must he drive off the horiontal ramp?The vertical height of the ramp is 1.5m above the cars and the horizontal distance must be

*asked on June 23, 2011* -
## physics

The shell’s trajectory curves downward because of gravity, so at the time t = 0.217 s the shell is below the straight line by some vertical distance ∆h. Find this distance ∆h in the absence of air resistance. The acceleration of gravity is 9.8 m/s 2

*asked on September 2, 2012* -
## physics

A man with a mass of 58 kg stands up in a 69-kg canoe of length 4.0 m floating on water. He walks from a point 0.75 m from the back of the canoe to a point 0.75 m from the front of the canoe. Assume negligible friction between the canoe and the water. How

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

The data in the table illustrates a linear function. x, -3,0,3,6, y, -6,-2,2,6

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

two forces, one of 35 pounds and the other 62 pounds, act upon the same object. The angle between these forces is 25 degrees. Find the magnitude of the resultant force.

*asked on October 29, 2012* -
## college physic

A stunt driver wants to make his car jump over 8 cars parked side by side below a horizontal ramp.(a)With what minimum speed must he drive off the horiontal ramp?The vertical height of the ramp is 1.5m above the cars and the horizontal distance must be

*asked on June 23, 2011* -
## Physics

Find the de broglie wavelength of a 1500-kg car when its speed is 80 km/h. How significant are the wave properties of this car likely to be?

*asked on November 2, 2017* -
## physics

How much potential energy does DeAnna with a mass 57.0 kg, gain when he climbs a gymnasium rope a distance of 3.7 m?

*asked on January 10, 2013* -
## Daily Language Review

there family has went to yellowstone national park This is the sentence that I have to correct and I keep getting it wrong. I need help.

*asked on September 3, 2010* -
## math

Simplify 4!

*asked on May 7, 2018* -
## physic

A person stands on a bathroom scale in a motionless elevator begins to move,the scale briefly reads only 0.75 of th person regular weight(means Fn=0.75mg).Calculate the acceleration of the elevator,and find the direction of acceleration.

*asked on July 10, 2011* -
## Math

A large university is interested in learning about the average time it takes students to drive to campus. The university sampled 238 students and asked each to provide the amount of time they spent traveling to campus. This variable, travel time, was then

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

I know this is pretty general, but it is the question. What can you say about the energy spread of the radiation emitted by an atomic gas?

*asked on May 15, 2016* -
## Psychics

a ball is projected horizontally from the edge of a table that is 2.00m high and it strikes the floor at 2.40m from the base of the table. what is the initial speed of the ball

*asked on November 16, 2015* -
## physics

hummingbirds beat their wings 1500 times in 30seconds calculate frequency and the period

*asked on January 12, 2015* -
## physics

A student librarian picks up a 2.2 kg book from the floor to a height of 1.05 m. He carries the book 8.3 m to the stacks and places the book on a shelf that is 0.35 m above the floor. How much work does he do on the book?

*asked on December 11, 2012* -
## physics

A hockey puck has a mass of 0.118 kg and is at rest. A hockey player makes a shot, exerting a constant force of 28.0 N on the puck for 0.16 s. With what speed does it head toward the goal?

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

when electricity is passed through water, the water decomposes into hydrogen gas and oxygen gas. when 10.00 kg of water were decomposed this way, 5788 l of oxygen gas were produced at 25 degrees celsius and 1 atm pressure. what is the percent yield of

*asked on November 21, 2014* -
## Chemistry

What is the concentration of the SCN- ion in the stock solution of 2.00 x 10-3 M NaSCN in 0.10M HNO3?

*asked on March 7, 2012* -
## college physic

A 1.25kg mass stretches a vertical spring 0.215m.If the spring is stretches an additional 0.130m and released, (a)how long does it take to reach the equilibrium position again? (b)Write an equation giving its position y as a function of time t. (c)What

*asked on July 26, 2011* -
## Biology

Without the invention of the microscope, would the cell theory have been possible? I don't think it would have been possible because through technology, the microscope, cells were visible. Without the microscope how could scientists have seen cells or

*asked on January 14, 2008* -
## AP Physics

A home run is hit such a way that the baseball just clears a wall 30 m high located 114 m from home plate. The ball is hit at an angle of 37 ◦ to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1 m above the

*asked on September 11, 2012* -
## college physic

Liquid helium is stored at its boiling point temperature of 4.2K in a shperical container(r=0.30m).The container is a perfect blackbody radiator.The container is surrounede by a sherical shield whose temperature is 77k.A vacuum exists in the space between

*asked on February 22, 2012* -
## college physic

Two identical thermometers made of pyrex glass contain,respectively identical volumes of mercury and methyl alcohol.If the expansion of the glass is taken into account,how many times greater is the distance between the degree marks on the methyl alcohol

*asked on February 7, 2012* -
## Chemistry

Calculate the number of mL of hydrogen gas at 27 degrees Celsius and 640 Torr produced by the reaction of 0.520 grams of magnesium with excess hydrochloric acid.

*asked on February 5, 2012* -
## Math

A 605-kg racing car completes one lap in 14.3 s around a circular track with a radius of 40.0 m. The car moves at constant speed. a) What is the acceleration of the car? (b) What force must the track exert on the tires to produce this acceleration?

*asked on December 3, 2012* -
## math

Nico is saving money for his college education. He invest some money at 5%, and $1600 less than that amount at 3%. The investments produced a total of $144 interest in 1yr. How much did he invest at each rate?

*asked on February 20, 2018* -
## geometry

I have no clue to this. Please help. Line segment CD has endpoints with coordinates (1,2) and (9,6). What is the location for point E so that E divides CD into the ratio 3:1?

*asked on November 7, 2016* -
## Physics

Small rockets are used to make tiny adjustments in the speeds of satellites. One such rocket has a thrust of 35 N. If it is fired to change the velocity of a 72100 kg spacecraft by 63 cm/s, how long should it be fired?

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

An airplane flies due south at 185 km/h relative to the air. There is a wind blowing at 68 km/h to the east relative to the ground. What are the plane's speed and direction relative to the ground?

*asked on December 3, 2012* -
## AP Physics

A quarterback throws the football to a stationary receiver who is 15.2 m down the ﬁeld. The football is thrown at an initial angle of 42 ◦ to the ground. The acceleration of gravity is 9.81 m/s 2 . a) At what initial speed must the quarterback throw

*asked on September 5, 2012* -
## pronouns

How is the pronoun in bold letters used? you can have the job if you know how to type. A.subject B.Direct object C.predicate nominative

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

Which number can be added to a rational number to explain that the sum of two rational numbers is rational? a: pi b: 3 7/8 c: square root of 8 d: square root of 47

*asked on October 3, 2017* -
## college physic

A solid cylindrical rod made from a center cylinder of lead and an outer concentric jacket of copper.Except for its ends,the rod is insulated,so that the loss of heat from the curved surface is negligible.When a temperature difference is maintained between

*asked on February 22, 2012* -
## History

Could someone review and correct my answers please. I need to decide if each item was an initiative only within Kennedy’s New Frontier, if it was proposed by both presidents, or if it was an initiative only within Johnson’s Great Society. 1. Head Start

*asked on July 4, 2008* -
## History

Can someone explain this question to me and help me find some sites. I'm a little lost. Describe the connection between student unrest and the Vietnam War, noting how each affected the other. Explain the political and social outcomes of the end of the

*asked on July 13, 2008* -
## Math

The art teacher bought some boxes of colored pencils with 7 pencils in each box. She bought a total of 28 pencils. Write an equation that you could use to find how many boxes the art teacher bought.

*asked on September 5, 2018* -
## health

hat is physical stress? A. A physical reaction of the body to various triggers B. A physical reaction of the mind to various triggers C. A physical reaction of the soul to various triggers D. A physical reaction to the heart to various triggers i think its

*asked on February 7, 2013* -
## physics

A 2.2 kg rock initially at rest loses 412 J of potential energy while falling to the ground. Assume that air resistance is negligible. Calculate the kinetic energy that the rock gains while falling. What is the rock's speed just before it strikes the

*asked on January 10, 2013* -
## Calculus

My question is with a multi-part homework assignment that we got in class. The information given is : A factory manufactures widgets. The rate of production of widgets after t weeks is widgets/ week. The equation for this is dx/dt=30(1-(20/((t+20)^2))).

*asked on February 7, 2017* -
## Math

What shape has 21 faces and 14 vertices

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

Two people start from the same point. One walks east at 4 mi/h and the other walks northeast at 3 mi/h. How fast is the distance between the people changing after 15 minutes? (Round your answer to three decimal places.)

*asked on March 1, 2015* -
## Physics

A 0.201-kg plastic ball moves with a velocity of 0.30 m/s. It collides with a second plastic ball of mass 0.105 kg, which is moving along the same line at a speed of 0.10 m/s. After the collision, both balls continue moving in the same, original direction.

*asked on December 19, 2012* -
## AP Physics

A bullet of mass 0.0022 kg moving at 568 m/s impacts a large ﬁxed block of wood and travels 5.2 cm before coming to rest. Assuming that the deceleration of the bullet is constant, ﬁnd the force exerted by the wood on the bullet. Answer in units of kN

*asked on October 2, 2012* -
## Math 4

Teresa has 4 flowers, 4 designs. How many ways can she display/mix them up. Thank you ....but 4x4 seems too simple. If I line up abcd, bcda,cdab, etc...... (Naming each design abcd) ??? is it possibley more?

*asked on September 22, 2009* -
## Algebra

Can someone please check my answers. 1. Solve. –7x + 1 + 8x = x + 1 A) Identity B) No solution C) 1 D) 0 My answer: A) Identity 2.The length of one of the equal legs of an isosceles triangle is 8 cm less than 4 times the length of the base. If the

*asked on April 21, 2007* -
## Math

How many squares with sides that are 6 inches long are needed to cover a square with a side length of 30 inches without overlaping?

*asked on October 12, 2017* -
## math

Beth leaves her home on her bike, traveling down a long country road, at the rate of 8 mph. Her brother, Brandon, left 15 minutes after Beth on his golf cart along the same country road, traveling 12 mph. How long will it take Brandon to catch up with

*asked on September 11, 2017* -
## geometry

Help!!! Line segment EF in the xy-coordinate plane has endpoints with coordinates (-4,9) and (6,4). What are two possible locations for point G so that G divides EF into two parts with lengths in a ratio of 1:4?

*asked on November 8, 2016* -
## physics

What is the maximum current allowed in a 7.5 W, 300 resistor?

*asked on April 12, 2013* -
## physics

A sonar signal of frequency 1.00 106 Hz has a wavelength of 1.40 mm in water. (a) What is the speed of the signal in water? (b) What is its period in water? (c) What is its period in air?

*asked on February 1, 2013* -
## Algebra

1.In this problem, we will analyze the profit found for sales of decorative tiles. A demand equation (sometimes called a demand curve) shows how much money people would pay for a product depending on how much of that product is available on the open

*asked on January 20, 2008* -
## social studies

did germany take over sweden in WW2

*asked on April 14, 2013* -
## helath

If you’ve decided to lose weight then ________. A. Even modest weight loss can lead to big health benefits B. Modest weight loss can lead to little health benefits C. Large weight loss can lead to little health benefits D. Little weight loss can lead to

*asked on February 7, 2013* -
## Math

if jan has 7 stickers and her brother gives her 6 more how many does she have in total? which double fact can you use to figure out how many stickers she has

*asked on January 30, 2013* -
## math

You have 60 red socks and 30 blue socks unpaired in a drawer. You can not see the socks, they are in a drawer and it is dark. What is the minimum number of socks that you have to pull out before you have a matching pair?

*asked on January 24, 2013* -
## physics

A 0.201-kg plastic ball moves with a velocity of 0.30 m/s. It collides with a second plastic ball of mass 0.105 kg, which is moving along the same line at a speed of 0.10 m/s. After the collision, both balls continue moving in the same, original direction.

*asked on December 18, 2012* -
## math

What fraction = .40625

*asked on December 7, 2012* -
## Physics

A powerboat heads due northwest at 11 m/s relative to the water across a river that flows due north at 5.4 m/s. What is the velocity (both magnitude and direction) of the motorboat relative to the shore?

*asked on December 3, 2012* -
## AP PHYSICS

A quarterback throws the football to a stationary receiver who is 15.2 m down the ﬁeld. The football is thrown at an initial angle of 42◦ to the ground. The acceleration of gravity is 9.81 m/s 2 a) At what initial speed must the quarterback throw the

*asked on September 11, 2012* -
## physic

a baseball pitcher throws a baseball with a speed of 4m/s.Estimate the average acceleration of the ball during the throwing motion.In throwing the baseball,the pitcher accelerates the ball through a displacement of about 3.5m,from behind the body to the

*asked on June 23, 2011* -
## language

What is the complete predicate in the question: Did you know the ancient Greeks wrote many plays?

*asked on October 9, 2008* -
## Algebra

How is doing operations (adding, subtracting, multiplying, and dividing) with rational expressions similar to or different from doing operations with fractions?

*asked on January 23, 2008* -
## Algebra

I just need help with the number game part. I can't think of any kinds of games to come up with? Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. Did

*asked on January 21, 2008* -
## Algebra

Consider the monomials 15 and 6 . a. Factor the monomials. b. What factors of these monomials are common factors? c. Find the greatest common factor of 15 and 6 .

*asked on September 6, 2018*

## Pages

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