Spencer

Most popular questions and responses by Spencer
1. Chemistry

Calculate the concentrations of all species present in a 0.33 M solution of ethylammonium chloride (C2H5NH3Cl). Okay so i tried doing HA = H + A ice table regular it doesnt work idk what Ka to use. b/c of the chloride. i have to find [C2H5NH2][H+][OH

asked on February 15, 2009
2. physics EM

You have a 0.600-m-long copper wire. You want to make an N-turn current loop that generates a 1.30 mT magnetic field at the center when the current is 0.600 A. You must use the entire wire. What will be the diameter of your coil? this doesnt seem that hard

asked on March 31, 2008
3. chemistry

0.10 M methylamine (CH3NH2) kb= 4.38e-4 calc the percent ionization so i did the ICE table to find that x=6.26e-3 and then i divided by .1 and then multiplied by 100. but i got the wrong answer whats did i do wrong?

asked on February 14, 2009
4. physics

use the phythagorean theroem to answer this question. becca paddles a boat from the south bank of a stream to the north bank. She paddles at a rate of 8 mph. The stream is flowing west at a rate of 6 mph. what is beccá actual velocity. I need to

asked on January 19, 2010
5. Physics E&M

A Geiger counter detects radiation such as alpha particles by using the fact that the radiation ionizes the air along its path. A thin wire lies on the axis of a hollow metal cylinder and is insulated from it. View Figure A large potential difference is

asked on February 19, 2008
6. Physics E&M

Three electrons form an equilateral triangle 1.00 nm on each side. A proton is at the center of the triangle.What is the potential energy of this group of charges?

asked on February 18, 2008
7. U.S. Government

"No person who may hereafter fight a duel, assist in the same as second, or send, accept, or knowingly carry a challenge therefor, shall hold any office in the State, for a period of ten years...." -Arkansas state constitution, Article 19, Section 2 Why

asked on April 25, 2017
8. Physics EM

An ammeter is connected in series to a battery of voltage V_b and a resistor of unknown resistance R_u The ammeter reads a current I_0. Next, a resistor of unknown resistance R_r is connected in series to the ammeter, and the ammeter's reading drops to

asked on March 6, 2008
9. Physics E&M

A proton and an alpha particle ( q= + 2e, m=4u ) are fired directly toward each other from far away, each with an initial speed of 0.01 c.What is their distance of closest approach, as measured between their centers?

asked on February 18, 2008
10. Math

A fireman used a ladder with 56 rungs. The rungs are 14 inches apart and 1.5 inches thick. What is the distance from the bottom of the lowest rung to the top of the highest rung? Check if I solved correctly please. I multiplied 55*14 because there would be

asked on September 19, 2015
11. science (6th)

please use the following terms in the same sentence- invertebrate, vertebrate and placenta. Thank you

asked on February 21, 2010
12. Chemistry

Calculate the percent ionization of benzoic acid at the following concentrations: 0.00014 M i got 68% but it says its wrong

asked on February 14, 2009
13. Anasazi

1) How where the Anasazi able to grow crops in their dry land?

asked on May 19, 2012
14. physics EM

Shrinking Loop. A circular loop of flexible iron wire has an initial circumference of 167 cm, but its circumference is decreasing at a constant rate of 10.0 cm/s due to a tangential pull on the wire. The loop is in a constant uniform magnetic field of

asked on April 8, 2008
15. trig

(cotxsec2x - cotx)/ (sinxtanx + cosx) = sinx prove. i keep getting (if i start from the left side) = cosx instead of sinx please help!

asked on January 20, 2009
16. Chemistry

The distribution coefficient between ether and water for aspirin at room temperature is 3.5. What weight of aspirin would be extracted by a single extraction with 60 ml of water from a solution of 10 grams of aspirin in 100 ml of ether? Calculate the

asked on September 8, 2015
17. another EM

Magnetic resonance imaging needs a magnetic field strength of 1.5 T. The solenoid is 1.8 m long and 75 cm in diameter. It is tightly wound with a single layer of 2.50-mm-diameter superconducting wire. What size current is needed? Thanks in advance

asked on March 31, 2008
18. math

Basic unit of volume in the metric system; equal to 1.057 quarts. Is it A.centi- B.dec- C.gram D.liter E.meter F.milli-

asked on October 2, 2007
19. Chemistry

As an eager scientist on a hot summer day you wish to determine how much ice to buy to add to your cooler which is filled with 4.0 × 101 cans of soda which are warm at 82.9°F. Each can has a mass of 378 g and ideally you want the temperature of the

asked on April 9, 2016
20. Physics

An apple is placed 17.0 cm in front of a diverging lens with a focal length of magnitude 23.2 cm. What is the image distance i of the image of the apple through this lens? What is the magnification of the image of the apple? Wwhich of the following

asked on January 15, 2012
21. physics EM repost

Magnetic resonance imaging needs a magnetic field strength of 1.5 T. The solenoid is 1.8 m long and 75 cm in diameter. It is tightly wound with a single layer of 2.50-mm-diameter superconducting wire. What size current is needed? Thanks in advance

asked on March 31, 2008
22. math

Dr. Pepper left Oakville at 9:00 AM and drove to Central City at 60 km/h. H. Salt left Oakville at 11:00 AM and traveled the same route to Central City. If both men arrived at Central City by 4:00 PM at what rate did H Salt travel. We have to set the

asked on October 7, 2019
23. grade 11 physics

A bomber flying horizontally at 250 m/s releases a bomb 1500m above the ground. At the point of impact, what were the horizontal speed and vertical speed?

asked on October 17, 2010
24. Anasazi

Also, how did the Anasazi create homes that were adapted to their environment?

asked on May 19, 2012
25. Physics

A driver brings a car traveling at 22m/s to a full stop in 2 seconds. How fast does the car uniformly decelerate?

asked on September 14, 2014
26. PHYSICS!

A horizontal force of 10 N is applied to the outer edge of a door at an angle of 32° to the door, as shown in a view from the top looking down. The width of the door is 0.80 m. The magnitude of the torque of this force on the door with respect to the

asked on June 9, 2012
27. PHYSICS

A driver of a 7400 N car passes a sign stating "Bridge Out 30 Meters Ahead." She slams on the brakes, coming to a stop in 10 s. How much work must be done by the brakes on the car if it is to stop just in time? Neglect the weight of the driver, and assume

asked on October 24, 2010
28. Chemistry

NEWW- 0.10 M methylamine (CH3NH2) kb= 4.38e-4 calc the percent ionization so i did the ICE table to find that x=6.62e-3 (that was a typo the first time) and then i divided by .1 and then multiplied by 100. but i got the wrong answer whats did i do wrong?

asked on February 15, 2009
29. long physics E&M

A Geiger counter detects radiation such as alpha particles by using the fact that the radiation ionizes the air along its path. A thin wire lies on the axis of a hollow metal cylinder and is insulated from it. View Figure A large potential difference is

asked on February 19, 2008
30. Physics

A bug is 12 cm from the center of a turntable that is rotating with a frequency of 45 rev/min. What minimum coefficient of friction is required so that the bug stays on the turntable?

asked on October 4, 2019
31. math

I have a question on my math homework. The question is "half the perimeter of a garden is 18 feet. The garden is 8 feet longer than it is wide. How wide is the garden." How do i figure this put. urgent

asked on June 7, 2019
32. Chemistry

What is the maximum mass of H2O that can be produced by combining 84.4 g of each reactant? 4NH3 (g) + 5O2 (g) -----> 4NO (g) + 6H2O (g) ___________ g H2O ?

asked on April 14, 2015
33. Calculus

A spotlight on the ground is shining on a wall 24\text{m} away. If a woman 2\text{m} tall walks from the spotlight toward the building at a speed of 0.6\text{m/s}, how fast is the length of her shadow on the building decreasing when she is 2\text{m} from

asked on December 8, 2015
34. Physics EM

A battery with EMF 90.0 V has internal resistance R_b = 8.68 Omega. What is the reading V_v of a voltmeter having total resistance R_v = 485 \Omega when it is placed across the terminals of the battery? Express your answer with three significant figures.

asked on March 10, 2008
35. Math

At a school with 100 students, 35 take French, 32 take German, and 30 take Spanish. Twenty students take only French, 20 take only German, and 14 take only Spanish. In addition, 7 students are taking both French and German, some of whom also take Spanish.

asked on September 19, 2015
36. physics college level

A 2.0-kg block is projected up a frictionless inclined plane with a speed of 10 m/s. The angle of inclination is 30o . The block goes a distance of _____ up the plane before stopping. Assume g = 10 m/s2

asked on April 2, 2014
37. Physics

In an Atwood machine, one block has a mass of M1 = 520 g and the other has a mass of M2 = 320 g. The frictionless pulley has a radius of 4.6 cm. When released from rest, the heavier block moves down 51 cm in 1.00 s (no slippage). What is the tension T1?

asked on November 5, 2011
38. Chemistry Acid/bases

The concentration of H2SO4 in a solution is 3.20 10-6 M. Assume the acid dissociates completely in solution. What is the [H3O+] in the solution? What is the [OH-] in the solution? What is the pH of the solution? What is the pOH of the solution? OK SO I

asked on February 10, 2009
39. Geometry

I've been working forever to figure out this problem! If two flagpoles are 10m and 70m tall and are 100m apart, find the height of the point where a line from the top of the first to the bottom of the second intersects a line from the bottom of the first

asked on January 16, 2008
40. Social Studies

someone already posted something similar to mine but i think they're in my class and we have way different problems to work on... name if the following involve, seperation in powers, checks and balances, judicial review, federalism, or some combination of

asked on October 31, 2010
41. physics EM

Which of the following choices of path allow you to use Ampère’s law to find B(r). 1. The path must pass through the point r_vec. 2. The path must have enough symmetry so that B(r)x dl is constant along large parts of it. 3. The path must be a circle.

asked on March 24, 2008
42. Chemistry

Examine the redox reaction. As2O3(s) + Cl2(g) + H2O(l) → H3AsO4(aq) + HCl(aq) How many electrons are lost by each As atom during the reaction? A)4 B)3 C)2 D)1

asked on June 22, 2018
43. Physics

golf club with a mass of 250 g travels at 50 meters per second hits a 40 g golf ball and continues traveling at 35 m/s. What is the speed of the golf ball after impact?

asked on May 10, 2011
44. Pre-Cal.

Determine between which consecutive integers one or more real zeros of f(x)=3x^4+x^3-2x^2+4 are located? A. no real zeros B. 0 and 1 C. -2 and -3 D. -1 and 0 I was thinking it's either A or C? I need lots of help.

asked on March 26, 2009
45. physics EM

Ive tried multiple answers but cant get it right. Which of the following changes would induce an electromotive force (emf) in the loop? When you consider each option, assume that no other changes occur. a. The magnitude of B_vec increases. b. The magnitude

asked on April 6, 2008
46. Algebra

which factors would you multiply first to find the product of 2x5x3? Explain your reasoning.

asked on December 6, 2011
47. Thermodynamics

A rigid insulated closed tank consists of two compartments of equal volume separated by a valve. Initially one contains air at 145 psia and temperature of 130 F, while second is completely empty(vaccum). the valve is opened and remains so until both are in

asked on March 15, 2010
48. Physics E&M

A 68.0 g hollow copper cylinder is 90.0 cm long and has an inner diameter of 1.0 cm. The current density along the length of the cylinder is 1.60×10^5(A/m^2). What is the current in the cylinder? Ive tried many ways but am not getting the correct answer.

asked on February 12, 2008
49. physics

hi can somebody help me with this?? a solenoid of length L and radius R carries a current I in its N turns. what is the total energy stored in the magnetic field within the solenoid? Compute the inductance L using the solenoid formula. You should be able

asked on August 5, 2007
50. Math

105 students were asked if they liked soccer, rugby, or football. 4 liked only rugby, 40 liked rugby, 12 liked only rugby and football, 63 did not like football, 21 didn't like any, 16 liked only soccer and football, 60 liked soccer. How many liked only

asked on September 19, 2015
51. Algebra 2

Standard form for both equation with steps 16x^2-96x+144+25y^2=400 16x^2+192x+576+25y^2=1600

asked on August 6, 2015
52. physics

A car is moving at 37 m/s. It slams on its brakes and comes to a stop in 22 m. What was the acceleration from the brakes?

asked on January 3, 2013
53. Trigonometry

Point P is located at the intersection of the unit circle and the terminal side of angle theta in standard position. Find the coordinates of P to the nearest thousandth.

asked on September 17, 2012
54. physics EM

A 59.0 -turn, 4.10-cm-diameter coil with R = 0.530 {\Omega} surrounds a 1.70-cm-diameter solenoid. The solenoid is 21.0 cm long and has 170 turns. The 60 Hz current through the solenoid is I_sol = (.470A)*sin(2*pi*f*t). I guess f is the frequency. Find the

asked on April 7, 2008
55. Physics E&M

A slab of metal of volume V is made into a rod of length L. The rod carries current I when the electric field inside is E.Find the resistivity of the metal?

asked on February 12, 2008
56. Physics (Attempt 3 for help)

A person with the weight of 691 N stands on a bathroom scale in a motionless elevator. The elevator begins to move and the scale momentarily changes to 499 N. (a) Draw a force diagram of the situation. (b) Create a qualitative vertical equation for this

asked on April 11, 2017
57. Math

105 students were asked if they liked soccer, rugby, or football. 4 liked only rugby, 40 liked rugby, 12 liked only rugby and football, 63 did not like football, 21 didn't like any, 16 liked only soccer and football, 60 liked soccer. How many liked only

asked on September 20, 2015
58. Physics

Ann, Sam and you take a trip to the orbiting International Space Station, bringing along a hula hoop that is 1.02 m in diameter (= 2R) and has a mass Mh = 2.0 kg. You are watching from a viewport while Sam and Ann go outside for a (space) walk. You see

asked on April 13, 2015
59. physics

Hi I need to know how much ground water presuure would be required to lift a 1.200m diameter plastic tank weighing 650kg out of the ground please, Please supply the answer in Kpa or psi Cheers

asked on July 18, 2011
60. 6th grade math

liam is planting 30 bean plants and 45 pea plants in his garden. If he puts the same number of plants in each row and if each row has only one type of plant, what is the greatest number of plants he put in one row?

asked on February 7, 2012
61. SPANISH

I Need to write a letter to a girl in spanish for my spanish class. how do i start? how do i say, hi i really like you?

asked on February 2, 2009
62. US history

was the bank war basically just the opposition of jackson towards the bank or was there mor to it? i already checked google.

asked on February 1, 2009
63. naming chemical compounds

what is the dihydrogen phosphate ion? and the answer is not H2PO4-, H2PO4, HPO4... =(

asked on January 18, 2009
64. physics

Zak, helping his mother rearrange the furni- ture in their living room, moves a 59 kg sofa 2 . 6 m with a constant force of 36 N. What is the work done by Zak on the sofa?

asked on September 26, 2013
65. Physics

If a tank is standing up i.e 1.200 dia x 1.100 high with 650 kg inside, How much water pressure to lift it Cheers

asked on July 28, 2011
66. MATH

HOW DO I FIND THE LEAST COMMON DENOMINATOR

asked on March 31, 2011
67. algebra II

Convert to decimal notation 8.88 * x10^7

asked on October 23, 2010
68. physics EM

using the Amperes Law The circle on the integral means that B(r) must be integrated A. over a circle or a sphere. B. along any closed line that you choose. C. along the path of a closed physical conductor. D.over the surface bounded by the current-carrying

asked on March 24, 2008
69. repost physics E&M please

A battery with EMF 90.0 V has internal resistance R_b = 8.68 Omega. What is the reading V_v of a voltmeter having total resistance R_v = 485 \Omega when it is placed across the terminals of the battery? Express your answer with three significant figures.

asked on March 11, 2008
70. math

If 7y-2x-5,then x=?

asked on October 2, 2007
71. math

how long will it take to earn $787.50 on$5000 at 5 1/4%(percent) what is the rate it is compounded? annually, semi-annually, monthly, what? dat information is not given aren't you supposed to be using the interest rate formula? if so, then u have two

asked on February 19, 2007
72. Chemistry

A solubility graph showing the solubility in grams of substance X in 100.0 g of alcohol. At 20 degrees Celsius, 24.0 grams of substance X will dissolve. At 50 degrees, 60.0 grams will dissolve. A saturated solution of X (s) in alcohol is cooled down from

asked on June 22, 2018
73. physics

A person with the weight of 691 N stands on a bathroom scale in a motionless elevator. The elevator begins to move and the scale momentarily changes to 499 N. (a) Draw a force diagram of the situation. (b) Create a qualitative vertical equation for this

asked on April 11, 2017
74. Fractions

would you eat more if you ate 1/3 of a small pizza or 1/3 of a medium pizza

asked on January 14, 2013
75. history

How were the Pueblo people like the Anasazi???

asked on May 19, 2012
76. Physics

On a sunny day, a 1.20 m long vertical stick in air casts a shadow 1.20 m long. If the same stick is held vertically and touching the flat bottom of a pool of salt water (n=1.71) half the height of the stick, how long is the shadow on the floor of the

asked on January 8, 2012
77. Physics

Hi, I need to know how much ground water presuure would be required to lift a 1.200m diameter plastic tank weighing 650kg out of the ground please, Please supply the answer in Kpa or psi Cheers

asked on July 27, 2011
78. Science

Compare and contrast the particle arrangement (density) of a solid, liquid and gas?

asked on October 28, 2010
79. science

looking for some adaptations the chinese golden pheasant might have made

asked on March 4, 2010
80. help interpreting a DBQ question- Us History

I have to write about the: constitutional, political and practical concerns of the Indian Removal act. i get the constitutional point but i don't understand what a political concern is or what a practical concern is is practical like they were afraid that

asked on January 25, 2009
81. english

I need a summary on ch.13,14,15 on "Death on the Ice." by Cassie Brown I would really appreciate your help.

asked on March 30, 2008
82. History

What article in the constitution does it state Who has the power to settle disputes involving the United States?

asked on February 5, 2008
83. Chemistry

Why are smaller alcohols fully miscible with water while larger alcohols have lower solubility in water? A)In larger alcohols, the polar hydrocarbon chain cannot interact with non-polar water molecules and limits alcohol's ability to interact with water.

asked on June 22, 2018
84. Probability/Statistics

The teacher of a mathematics class has written up the final exam, but wants the questions to be random for each student. There are 28 students in the class, and the test has 100 questions. Each question has four possible answers. a. After reading carefully

asked on August 1, 2015
85. Probability/Statistics

The teacher of a mathematics class has written up the final exam, but wants the questions to be random for each student. There are 28 students in the class, and the test has 100 questions. Each question has four possible answers. a. After reading carefully

asked on July 20, 2015

Student budgeted a $25 a month for phone service. If the telephone company charges$18 a month for basic service and $.05 a minute for each long distance call, how many minutes can be spent on long distance calls each month? asked on November 24, 2014 87. physics Zak, helping his mother rearrange the furni- ture in their living room, moves a 59 kg sofa 2 . 6 m with a constant force of 36 N. What is the work done by Zak on the sofa? asked on September 26, 2013 88. Advanced Algebra 2 the sides of the triangle are in ratio 2:4:5. If the perimiter of the triangle is 88 meters, determine the legnth of each side. asked on August 15, 2011 89. 5th grade math MAKE A SET OF 12 NUMBERS WITH THE FOLLOWING LANDMARKS MAX: 8 RANGE: 6 MODE: 6 MEDIAN: 5 asked on October 6, 2010 90. US history Can some one explain to me in baby words what the panic of 1819 was? like it was caused by the united states bank because...how?? like its says stuff about loans and speculators but i don't know what that means! thanks asked on February 1, 2009 91. History I always get the Hutus and the Tutsis from Rwanda confused. Which was the group favored by the Dutch, and which was the group who initiated the genocide? asked on January 29, 2009 92. Precalc if you have how do u do 2^2x - 2^x - 6 =0 (calc)how do u do it? using logs?? asked on January 26, 2009 93. trigonometry okay so in my review packet under the "calculator" section it says law of sines and law of cosines. i don't know what that means. i wikipedia-ed it but i don't understand what they are saying. Please help! asked on January 22, 2009 94. physics em The corroded contacts in a lightbulb socket have 8.20 Omega resistance. How much actual power is dissipated by a 105 W (120 V) lightbulb screwed into this socket? asked on March 10, 2008 95. math 1.2x+3=9x 2.w is t area of a rectangle w a width of 12f & l of 10f ? 3.w is t perimeter of a triangle which sides measure 6? 8,and 10 in? 4.average of 132,140,145 & 128. 5.radius of a circle with a dimeter of 8in. 6.$1,500.00 + 5% sales tax =

asked on September 27, 2007
96. earth space science

how are each of the air masses related and/or different from each other? Are you talking about the various layers of the atmosphere?

asked on February 24, 2007
97. Chemistry

If a 300g sample of a substance has a half-life of 5 days, how much of the substance will decay after 22 days? A)293.4 g B)290.6 g C)285.8 g D)299.9 g

asked on June 22, 2018
98. precalc

sine curve in the form of y = a sin(pi/2x) that passes through the point (2.5,-9.546)

asked on March 18, 2013
99. boring history

why was the aztec civilization considered warlike???

asked on May 17, 2012
100. Physics

415V 505V 515V .------------.------------. There are 3 points w/same distance from each other (6x10-3m between each point). What is the magnitude and direction of electric field (E) in the vicinity of the origin (the middle point – 505V) ? Thank you!

asked on September 2, 2011

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