Questions and answers by

Jamie

Questions (696)

What substance in tobacco products causes stained teeth and skin?1) nicotine 2)carbon monoxide 3)tar 4)menthol I think #1 Thanks
1. 9 answers
2. 3,576 views
Sodium is a medal and chlorine is a poisonous gas. Neither is safe to eat. However, when sodium and chlorine is combine, it
1. 1 answer
2. 794 views
Artificial gravity. One way to create artificial gravity in a space station is to spin it.If a cylindrical space station 325 m
1. 1 answer
2. 2,278 views
You tie one end of 0.3-m-long spring to a 0.5 kg mass. Holding the other end of the spring in your hand, you whirl the mass in a
1. 1 answer
2. 2,492 views
Can you tell me the properties of algebraic expressions? Is there a website?Thanks for your help.
1. 1 answer
2. 502 views
use the inverse operation to solve below equation.19= h/3-8 equals 81 Thanks
1. 6 answers
2. 2,869 views
In which of the following sentence is the underlined verb used as an action verb?1) The animal (looked) hungry. 2) The trainer
1. 4 answers
2. 1,620 views
Factor 81-27p isA)9(9-3p) B)27(3-p) C)27(54-p) D)27(p-3) I think A but not sure. Is there a website that explains simplifying
1. 9 answers
2. 4,220 views
Which physical properties are characteristic of normal solids?1)brittle 2)little luster 3)malleable 4)ductile 5)good conductors
1. 1 answer
2. 931 views
Which physical properties are characteristic of metals? Choose all that apply.1) brittle 2)high luster 3)malleable 4)ductile
1. 2 answers
2. 2,363 views
After the Scientific Revolution, scientists no longer made their ideas about science fit?1) the results of their experiments 2)
1. 7 answers
2. 1,121 views
_____ is at the top of Maslow's hierarchy of needs?1) physical needs 2)safety 3)esteem 4)self-actualization I think #4 but all
1. 5 answers
2. 3,185 views
When you measure the boiling point of mercury, you are investigating a ____?1)chemical change 2)chemical property 3)physical
1. 4 answers
2. 3,063 views
During the Middle Ages, why was life in northern Italy different from life in the rest of Europe?A:italians were threatened by
1. 1 answer
2. 653 views
Which group was especially interested in winning the Crusades?1)farmers 2)teachers 3)merchants *** 4)artists I think merchants,
1. 14 answers
2. 2,314 views
Which of the following plays a role in determining a persons weight? select all that applyA:heredity. B:activity level. C:body
1. 2 answers
2. 2,061 views
In the Middle Ages, ceremonies such as weddings had t be performed by?1) the mam of the house 2)a bishop 3)a priest 4)the pope I
1. 1 answer
2. 590 views
Why did the system of feudalism arise during the Middle ages?A:to develop an economic system. B:to determine jobs within a city.
1. 1 answer
2. 532 views
Which of the following represents a heterogeneous mixture?1)saltwater 2)air 3)bleach and water 4)chicken noodle soup I think #3
1. 11 answers
2. 2,942 views
In the reaction below, 17 g of H2S with excessO2 produced 10 g of sulfur. 2 H2S + O2 → 2 S + 2 H2O . What is the percent yield
1. 1 answer
2. 1,124 views
The reaction of 8 grams of fluorine with excesschlorine produced 6.4 grams of ClF3. What percent yield of ClF3 was obtained?
1. 2 answers
2. 4,146 views
For a particular reaction, the rate constant is 2.32 ✕ 10−3 M/s at 185°C and 3.70 ✕ 10−3 M/s at 235°C. What is the
1. 1 answer
2. 572 views
QUESTION: How do you determine the molar mass of the unknown, nonelectrolyte compound for each trial?This is for a lab. My data
1. 1 answer
2. 1,027 views
Which of the following was an achievement of the Mayas?1) a system of canals in their main city? 2) the city of Tenochtitlan 3)
1. 3 answers
2. 685 views
I need help on my lab. I think I have all the data and steps right, but my results aren't making sense:Feezing point of water:
1. 1 answer
2. 566 views
The rate constant for the decomposition of acetaldehyde, CH3CHO, to methane, CH4, and carbon monoxide, CO, in the gas phase is
1. 1 answer
2. 2,673 views
At 500 K in the presence of a copper surface, ethanol decomposes according to the following equation.C2H5OH(g) CH3CHO(g) + H2(g)
1. 0 answers
2. 1,160 views
The port cities of East Africa traded with ?1)China,India, and Soutwest Asia 2)Songhai 3)Europe and the Americas 4)Portugal I
1. 1 answer
2. 522 views
The "perpendicular bisector" of the line segment \overline{AB}(The backslash then over line with the {AB} means that there's a
1. 1 answer
2. 715 views
The "perpendicular bisector" of the line segment \overline{AB}(The backslash then over line with the {AB} means that there's a
1. 0 answers
2. 612 views
The "perpendicular bisector" of the line segment $\overline{AB}$ is the line that passes through the midpoint of $\overline{AB}$
1. 7 answers
2. 1,702 views
2. Which of the following describes a relationship between science and society?A: Scientific discoveries can impact human life;
1. 2 answers
2. 2,202 views
Mecca lay on a trade route on the edge of the desert that takes up most of?1)the Red Sea 2)Syria 3)the Kabah 4)the Arabian
1. 3 answers
2. 1,550 views
Which of the following geographical locations share borders with SPAIN?1)Portugal, France, Atlantic Ocean 2)France, England,
1. 11 answers
2. 5,822 views
Find the derivative of 5^(x^3+x)I know the answer, it's: 5^(x^3+x)*ln(5)*(3x^2+ 1) I just need some help on how to derive that.
1. 1 answer
2. 417 views
Your first baby was born yesterday and is healthy and strong. To guard against your premature death, you want to purchase a life
1. 2 answers
2. 575 views
A chemist makes a solution of K2SO4 by dissolving 21.7 g K2SO4 in water to make 100.0 mL of solution. What is the concentration
1. 1 answer
2. 2,545 views
THe Acme Industrial Tech College has fallen on hard times. Last year its enrollment dropped by 20%, and this year enrollement
1. 2 answers
2. 512 views
When 2.38 g of methane burns in oxygen, 119 kJ of heat is produced. What is the enthalpy of combustion (in kJ) per mole of
1. 2 answers
2. 664 views
Determine the first three terms of the power series representations for the following functions:a) 2/(1+x)^3 b) 1/1+x^2 c)
1. 2 answers
2. 416 views
lim (2^x-3^x)/(cos(x)-1)x->0 The answer the book has for this is "diverges." I know I'm supposed to use L'Hospitals' rule, but
1. 1 answer
2. 401 views
At 57.7°C, the vapor pressure of CCl4 is 56.1 kPa, and its enthalpy of vaporization is 29.82 kJ/mol. Use this information to
1. 12 answers
2. 985 views
Hydrogen gas (H2) is generated by the following reaction.Ca(s) + 2 HCl(aq) → CaCl2(aq) + H2(g); ΔH = −542.7 kJ/mol When
1. 1 answer
2. 1,215 views
Question: What is the density (in g/L) of ethyne gas at 743 torr and 12.2°C? The unrounded molar mass of ethyne is 26.036
1. 4 answers
2. 1,028 views
Instead of spending the $50 a month you receive, you decided to invest it in your money market account at your bank. Assuming
1. 1 answer
2. 698 views
If there was a baby boom of Oompa Loompas ready to work for free, what will happen to the Willy Wonka chocolate market? In
1. 1 answer
2. 780 views
If the maximum velocity v of an electron in copper wire is about 2.0x10^8 cm/s, with an uncertainty ≤ 1%, how accurately can
1. 1 answer
2. 814 views
Suppose it takes 35 min for 2.4 g of sugar to completely react with another reagent we added to the flask. What would the
1. 2 answers
2. 4,766 views
So I already post a question however I forgot to write the definition of "conventional phrases" so here it is:Meaning beyond
1. 2 answers
2. 582 views
I need help finding conventional phrases in the Ballad of Birmingham by Dudley Randall that could add to the mood of suspense
1. 2 answers
2. 729 views
How do I find vertex, focus and directrix for the following functions?y^2−16y=12x−8^2 x^2+16x=4y−24 (x−2)^2=12(y−2)
1. 1 answer
2. 1,214 views
Write the following function as the sum of an odd and an even function. Then calculate the integral over the given interval
1. 1 answer
2. 513 views
A uniform-width boardwalk is built around the inside edge of a rectangular parkland that is 30 m by 5 m. If the boardwalk takes
1. 1 answer
2. 909 views
What are the literary devices used here?"I am frightened: I dare think this way no more. This way lies the abyss. It is not now
1. 1 answer
2. 549 views
A flagpole at right angle to the horizontal is located on a slope that makes an angle of 12∘ with the horizontal. The pole's
1. 2 answers
2. 8,933 views
(−6)∙(a+2b−3c−4d)−(−2)∙(−4a−3b+2c+d)
1. 8 answers
2. 1,494 views
(−5)∙(3b−2a)−6(a+2b)
1. 1 answer
2. 235 views
Does every neutral helium atom in the universe have the same set of absorption lines as every other neutral helium atom (with
1. 0 answers
2. 554 views
I have a follow-up question from a problem I posted earlier:Approximate sin(61π/360): So, sin(60π/360 + π/360) = sin(π/6 +
1. 1 answer
2. 734 views
a) Find a linear approximation of y=sinx at x=pi/6b) use part (a) to approximate sin(61pi/360) and sin(59pi/360) I just really
1. 1 answer
2. 1,952 views
A child is flying a kite. If the kite is 135 feet above the child's hand level and the wind is blowing it on a horizontal course
1. 1 answer
2. 635 views
A street light is at the top of a 10.5 ft. tall pole. A man 5.4 ft tall walks away from the pole with a speed of 3.5 feet/sec
1. 1 answer
2. 1,001 views
Directions (or bearings) on Earth are measured in degrees, running from zero to 360 degrees, clockwise, starting with 0 degrees
1. 1 answer
2. 1,268 views
The figure at right shows a long rectangular strip ofpaper, one corner of which has been folded over to meet the opposite edge,
1. 2 answers
2. 1,475 views
A magician showed a magic trick where he picked one card from a standard deck. Determine what the probability is that the card
1. 2 answers
2. 2,367 views
Each of the letters in the word CALCULATOR are on separate cards, face down on the table. If you pick a card at random, what is
1. 1 answer
2. 722 views
I'm trying to find all the points on the graph y=4/3cos^3x-cosx where the tangent line is horizontal. I took the derivative,
1. 1 answer
2. 508 views
The horizontal velocity is constant. (Ignore air resistance.) Recall from your study of trigonometry that if you release a rock
1. 1 answer
2. 542 views
You drop a rock into a deep well. You can't see the bottom of the well but you can hear the impact after T seconds. Suppose the
1. 1 answer
2. 635 views
How much energy, in calories, does it take to convert 20.0 grams of solid water, at 0.0 degrees C, into liquid water, at 0.0
1. 1 answer
2. 814 views
WebWork = 28%Four exams = 6% each A final = 28% Labwork = 20% Suppose you obtain 100 percent credit on all WeBWorK assignments
1. 0 answers
2. 712 views
In , is a right angle. Find the remaining sides and angles. Round your answers to the nearest tenth. Show your work.a = 3, c =
1. 1 answer
2. 458 views
Please help me.1. Use the definition of the derivative to find f'(x), if f(x)=x^-2 2.Find the derivative of y=3t^5 - 5√t + 7/t
1. 2 answers
2. 458 views
8×5+8×1-2×6+6-2 add parentheses to get 22
1. 1 answer
2. 440 views
Not sure where to begin with this question--any help appreciated!Two kids sitting on opposite sides of a small lake use sticks
1. 0 answers
2. 475 views
Find an equation of the line having the given slope and containing the given point. m equals negative 7, (5 ,9)
1. 1 answer
2. 365 views
Not at all sure where to start with this problem. Any help would be appreciated!The siren of an ambulance has a frequency f=500
1. 2 answers
2. 690 views
A pan flute is based on standing wave resonance in a tube that is open where themusician blows and closed at the bottom end with
1. 1 answer
2. 816 views
Two kids sitting on opposite sides of a small lake use sticks to beat the surface of thewater at a frequency f=1.5 Hz. They
1. 1 answer
2. 539 views
The siren of an ambulance has a frequency f=500 Hz. A pedestrian standing on asidewalk listens to this siren as the ambulance
1. 1 answer
2. 774 views
Poiseuille’s equation relates the volumetric flow rate Q (volume per time unit) to thepressure differential ΔP that drives
1. 0 answers
2. 624 views
Any help appreciated!Pull out a blank piece of paper from your exam book. Hold it from one of its ends and blow air horizontally
1. 0 answers
2. 703 views
Find the volume of the solid generated by revolving the region in the first quadrant that is above the parabola y= 4x^2 and
1. 3 answers
2. 1,050 views
Find the area of the region enclosed between y=4sin(x) and y=2cos(x) from x=0 to x=0.7pi.Hint: Notice that this region consists
1. 1 answer
2. 1,812 views
Please help! Any advice is appreciatedA water faucet in a house is h=8 m below the water surface in the local water tower. The
1. 1 answer
2. 623 views
Please help! Any advice is appreciatedA water faucet in a house is h=8 m below the water surface in the local water tower. The
1. 0 answers
2. 571 views
Any help is appreciated!A grandfather clock is based on the period of oscillation of a pendulum. The clock keeps perfect time on
1. 0 answers
2. 762 views
Not sure where to go with this problem, any help is appreciated!A bike is turned upside down for repairs. The front wheel can be
1. 0 answers
2. 542 views
Not sure where to go with this problem, any help is appreciated!A bike is turned upside down for repairs. The front wheel can be
1. 1 answer
2. 737 views
Could someone please help walk me through this problem I'm struggling with? Thanks in advance!A brick with mass m1=2.5 kg can
1. 1 answer
2. 780 views
Find the formula ofn Σ (j+3)(j-4) j=1 I have gotten to n(n+1)(2n+1)/6 - n(n+1)/2 - 12n How do I simplify it from there?
1. 1 answer
2. 368 views
Near the surface of the earth, the acceleration of a falling body due to gravity is 32 feet per second per second, provided that
1. 2 answers
2. 1,335 views
"The Lottery" (1948)by Shirley Jackson ** this website won't allow for links; therefore, I couldn't put the link of this story**
1. 1 answer
2. 726 views
Approximate the following value using derivatives (without a calculator)(1.1)^4 - (1.1)^2 I only know how to do linear
1. 2 answers
2. 527 views
Use the order of operations to find the value of the expression.6 x 5 + 3 x 8 Please help.
1. 1 answer
2. 428 views
I need to make a crossword puzzle using scientific notation and standard form
1. 1 answer
2. 484 views
How do I solve these linear system problems? I solved it many times but it never seems right.1. x^2 + y^2 =9 2x - y = -6 2.x^2 -
1. 1 answer
2. 494 views
What is the sample size in this experiment?How can you tell what the sample size is in this case? A team of researchers observed
1. 0 answers
2. 571 views
I. -28/4-7 *** 7 - 1/7 1/7 II. Which equation represents “fifteen more than r is sixty-one”? r + 61 = 15 r + 15 = 61 *** r
1. 1 answer
2. 796 views
A salt water swimming pool is 47.0 m long, 25.1m wide, and 2.79 m deep. If the pool is filled with salt water having a density
1. 1 answer
2. 722 views