Friday

May 27, 2016
Total # Posts: 280

**physics**

A playground merry-go-round of radius 2.00 m has a moment of inertia I = 255 kg·m2 and is rotating about a frictionless vertical axle. As a child of mass 25.0 kg stands at a distance of 1.00 m from the axle, the system (merry-go-round and child) rotates at the rate of ...
*April 2, 2016*

**physics**

The system of small objects shown in the figure below is rotating at an angular speed of 2.0 rev/s. The objects are connected by light, flexible spokes that can be lengthened or shortened. What is the new angular speed if the spokes are shortened to 0.15 m? (An effect similar ...
*April 2, 2016*

**physics**

In a circus performance, a large 5.0 kg hoop of radius 3.0 m rolls without slipping. If the hoop is given an angular speed of 3.0 rad/s while rolling on the horizontal and allowed to roll up a ramp inclined at 10° with the horizontal, how far (measured along the incline) ...
*April 2, 2016*

**physics**

A 1400-N uniform boom at ϕ = 70.0° to the horizontal is supported by a cable at an angle θ = 20.0° to the horizontal as shown in the figure below. The boom is pivoted at the bottom, and an object of weight w = 2250 N hangs from its top. (a) Find the tension ...
*April 2, 2016*

**physics**

A person bending forward to lift a load "with his back" (Figure (a)) rather than "with his knees" can be injured by large forces exerted on the muscles and vertebrae. The spine pivots mainly at the fifth lumbar vertebra, with the principal supporting force ...
*April 2, 2016*

**physics**

A 3.25-kg object is attached to a vertical rod by two strings as shown in the figure below. The object rotates in a horizontal circle at constant speed 6.60 m/s. (a) Find the tension in the upper string. N (b) Find the tension in the lower string. N
*March 28, 2016*

**Chemistry**

C + 4 HNO3 = CO2 + 4 NO2 + 2 H2O
*March 28, 2016*

**Chemistry**

10 C + 20 HNO3 = 10 CO2 + 20 NO2 + H20
*March 28, 2016*

**physics**

In a popular amusement park ride, a rotating cylinder of radius R = 3.10 m is set in rotation at an angular speed of 4.20 rad/s, as in the figure shown below. The floor then drops away, leaving the riders suspended against the wall in a vertical position. What minimum ...
*March 25, 2016*

**physics**

Suppose a 1800-kg car passes over a bump in a roadway that follows the arc of a circle of radius 18.4 m as in the figure shown below. (a) What force does the road exert on the car as the car passes the highest point of the bump if the car travels at 9.24 m/s? (Neglect any ...
*March 25, 2016*

**physics**

An air puck of mass m1 = 0.24 kg is tied to a string and allowed to revolve in a circle of radius R = 1.4 m on a frictionless horizontal table. The other end of the string passes through a hole in the center of the table, and a mass of m2 = 1.3 kg is tied to it (see the figure...
*March 25, 2016*

**pysics**

A 50.0-kg child stands at the rim of a merry-go-round of radius 1.65 m, rotating with an angular speed of 3.00 rad/s. (a) What is the child's centripetal acceleration? m/s2 (b) What is the minimum force between her feet and the floor of the carousel that is required to ...
*March 25, 2016*

**physics**

A rotating wheel requires 6.00 s to rotate 27.0 revolutions. Its angular velocity at the end of the 6.00-s interval is 97.0 rad/s. What is the constant angular acceleration (in rad/s) of the wheel?
*March 25, 2016*

**physics**

A centrifuge in a medical laboratory rotates at an angular speed of 3,550 rev/min. When switched off, it rotates through 54.0 revolutions before coming to rest. Find the constant angular acceleration (in rad/s2) of the centrifuge.
*March 25, 2016*

**math**

...Ok. And you answers are?
*March 22, 2016*

**Physics**

A partide of mass m moves along a trajectory given by x= a cos δ1 t and y = asinδ2 t . Find rand y component of the force acting on the patde, potential energy, kinetic enenev of the partide and hence show that the total energe E= KE + PE =1/2 m(a*2 δ1*2+ b*2 &#...
*March 13, 2016*

**Physics**

A pendulum is constructed of a mass m connected to a mass ess rigid rod of lengthl. As shownin the figure, the other end of the rodis suspended from a point on the ring ofradius R. The pendulum is free to swing in a vertical plane that is also the plane of the ring. The ring ...
*March 13, 2016*

**geometry**

Two overlapping identical circles have radii of 6.17. The area of their overlapping sections is 42.7. How far apart are the centers of the circles? Answer is 6.55
*February 28, 2016*

**geometry**

sinè = x/r and 20 = rè, but thanks anyway. you got me thinking on the right track.
*February 27, 2016*

**geometry**

Two persons each hold the end of a 20 ft long jumping rope. How far apart should they stand if they hold the rope 4.5 ft off the ground, and the middle of the rope just touches the ground? Assume the arc formed by the jumping rope is circular. I know that this problem involves...
*February 27, 2016*

**gtuc**

1. WRITE A PROGRAM TO CALCULATRE THE AREA OF A RECTANGLE OF LENGTH =5 CM AND BREADTH=8CM. 2. CALCULATE THE PRICE OF AN ITEM COSTING 100 GHANA CEDIS AFTER A DISCOUNT OF 10% IS APPLIED TO IT. 3. WRITE A PROGRAM TO CALCULATE THE SIMPLE INTEREST ON A LOAN AMONUT OF 50000 GHANA ...
*February 26, 2016*

**Art**

Which traits is not symbolized by chinese dragons? Wisdom Benevolence Evil Adaptability •• Correct me
*February 17, 2016*

**Art**

according to egyptian mythology horus son Kebehsenuef fit who has the head of a hawk. what characteristic might make Kebehsenuef fit for the job of watching a dead mummy vital organs? A kind and caring heart The keen eyes of a bird of pray •• Ingenuity A tendency ...
*February 17, 2016*

**Math PLZZZ HELPP MEE!!!**

the area of the parallelogram. Quadrilateral top: 5 cm side: 14 cm length: 12 cm *38 cm2 *60 cm2 •• *70 cm2 *168 cm2 3. Find the perimeter of the parallelogram. Quadrilateral top: 10.8 ft side: 5.1 ft length: 2.3 ft *15.9 ft *24.84 ft *31.8 ft •• *11.73 ft ...
*February 17, 2016*

**Math PLZZ HELP ME!!**

Thanks so much!!:)
*February 16, 2016*

**Math PLZZ HELP ME!!**

Can someone please explain me how to construct a perpendicular bisector!
*February 16, 2016*

**Math HELPP!!**

Eric Drew and up to's triangle. Which of the following could be true for Eric's triangle. A: all three angles have equal measures B: possible angle measures of the triangle are 92, 48, and 40•• C: two of the angles are equal, and the third angle has a measure...
*February 16, 2016*

**Math HELPP!!!!**

as a part of a geometry assignment john drew an equilateral triangle. which of the following dimensions could reprent the side length of the triangle john drew? 10,11,12 13,15,17 16,18,21 17,17,17•• Correct me!!
*February 16, 2016*

**Math. PLZZZ HELP ME!!!**

So it's A right?
*February 16, 2016*

**Math. PLZZZ HELP ME!!!**

Jackson made a poster in the shape of a quadrilateral. Opposite sides of the poster are congruent and parallel. Which of the following names the shape of Jackson’s poster? A.square B.rhombus C.rectangle D.trapzoid•• Correct me
*February 16, 2016*

**Art**

Never main I think it's B
*February 16, 2016*

**Art**

according to egyptian mythology horus son Kebehsenuef fit who has the head of a hawk. what characteristic might make Kebehsenuef fit for the job of watching a dead mummy vital organs? A kind and caring heart The keen eyes of a bird of pray Ingenuity A tendency towards anger&#...
*February 16, 2016*

**Art**

Which of the best definitions of personification? Giving animals and objects human characteristics•• Developing new characteristics of Personality Giving yourself the characteristics of someone else Giving human characteristics of animals Correct me if I'm wrong!!
*February 16, 2016*

**Chemistry**

Never main I got it!!
*February 16, 2016*

** Chemistry **

how to separate a mixture of iron filings, salt, sand and wood chips.
*February 16, 2016*

**U.s GOVERMENT**

Which Enlightenment thinker wrote that people in society are bound to one another by an implicit 'social contract'? A. Voltaire B. Marie Arouet C. Jean-Jacques Rousseau D. Thomas Paine
*February 3, 2016*

**physics**

A ball is thrown vertically upward with a speed of 19.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity when it returns to the ...
*January 31, 2016*

**physics**

A jet plane lands with a speed of 81 m/s and can accelerate at a maximum rate of −5.00 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest? (b) Can this plane land on a small tropical ...
*January 31, 2016*

**physics**

A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 205 mi/h in 2.70 s. (a) Find the average acceleration of the plane. (b) Assuming the acceleration is constant, find the distance the plane moves.
*January 31, 2016*

**trig**

In a certain right triangle, the two sides that are perpendicular to each other have lengths h = 4.40 m and b = 8.70 m. What is the length of the third side of the triangle?
*January 23, 2016*

**physics 1**

A ladder 8.70 m long leans against the side of a building. If the ladder is inclined at an angle of 69.0° to the horizontal, what is the horizontal distance from the bottom of the ladder to the building?
*January 21, 2016*

**physics 1**

The base of a pyramid covers an area of 13.0 acres (1 acre = 43,560 ft2) and has a height of 481 ft. If the volume of a pyramid is given by the expression V = (1/3)bh, where b is the area of the base and h is the height, find the volume of this pyramid in cubic meters.
*January 21, 2016*

**physics 1**

A house is 80.0 ft long and 22 ft wide, and has 8.0 ft high ceilings. What is the volume of the interior of the house in cubic meters and cubic centimeters?
*January 21, 2016*

**economic**

1 THE COPPERBELT UNIVERSITY SCHOOL OF BUSINESS BSP 110 PRINCIPLES OF ECONOMICS 2015 ASSIGNMENT DUE DATE: 4th January 2016 at 10am QUESTION A manufacturing firm in Kitwe has a normal demand curve given by Q = 5,000 – 100P and its total cost curve in the relevant range is ...
*January 7, 2016*

**economic**

1 THE COPPERBELT UNIVERSITY SCHOOL OF BUSINESS BSP 110 PRINCIPLES OF ECONOMICS 2015 ASSIGNMENT DUE DATE: 4th January 2016 at 10am QUESTION A manufacturing firm in Kitwe has a normal demand curve given by Q = 5,000 – 100P and its total cost curve in the relevant range is ...
*January 6, 2016*

**economic**

q = 5,000 - 100p tc= 10,000 - 10q plot the demand curve marginal revenue curve marginal cost curve profit maximising price, quantity, and profits
*December 31, 2015*

**managerial finance**

Completed all answers except the last one and I am stuck. Can someone please show me how to solve? I can't figure it out and I would like to have the steps so I can learn how to solve. Thank you! Jiminy's Cricket Farm issued a 30-year, 7.2 percent semiannual bond 6 ...
*November 24, 2015*

**trinometry**

consider the polar equation r=7 cos(θ+ pi divided by 4) A) change the equation to rectangular coordinates. B) by completing the square, obtain the Standard form of this well-known equation. I NEED HELP WITH THIS PROBLEM I DON'T KNOW WHERE TO START.
*November 20, 2015*

**Algebra 2**

Give the domain of the function. g(x)= x^3-1 I think the domain is all real numbers. Am I wrong? If so why?
*November 8, 2015*

**trignometry**

Some equations cannot be solved by symbolic manipulations. Use a graph to find all solutions of the equation sin 8x = 2x - 1. Show the details in a sketch of the graph.
*October 24, 2015*

**trignometry**

Give a list of solutions, in the interval [0, 360°), in degrees, of the equation 2cos^24θ + 5 cos 4θ = 3.
*October 24, 2015*

**trignometry**

give answer in radians for the following equation: sin(x)+2sin(x)cos(x)=0
*October 24, 2015*

**trigonometry**

solve for equation x(give answer in radians using exact values only. 2sin(x)+cot(x)-csc(x)=0
*October 24, 2015*

**Finance**

You plan to start a
*September 20, 2015*

**s. economics**

Brooke and Georgia are neighbors. Each have 40 hours per week. Brooke needs 5 hours to paint a beautiful picture and 2 hours to make a picture frame. Georgia takes 8 hours to paint an equally beautiful picture and 4 hours to make a picture frame. What two conditions are ...
*August 31, 2015*

**chemistry **

If a 0.01M Mn(NO3)2 solution has an ammonia concentration of 6.0M, would a precipitate form? Calculate the ion product and compare to Ksp.
*July 8, 2015*

**physics**

When a driver presses the brake pedal, his car stops with an acceleration of -8.7 m/s2. How far will the car travel while coming to a complete stop if its initial speed was 10 m/s?
*June 11, 2015*

**physics**

A marble is flicked horizontally off a desk with a speed of 3.1 m/s. If it takes the marble 0.8 seconds to hit the ground, how far from the desk does it land?
*June 10, 2015*

**chemistry**

if you are given 25 grams of H2O how many grams of H2 can you produce??? i am lost... help
*June 1, 2015*

**chemistry**

how many moles of hydrogen would be produced from 16 moles of Na?/ xH2mol/16Namol??/
*June 1, 2015*

**chemistry**

is the formation of an aqueous solution with water, a physical or chemical property? physical..... because the substance doesn't change.....
*May 31, 2015*

**chemistry**

okay, i get it, thank you!
*May 31, 2015*

**chemistry**

how many significant figures are in the measurement 0.002 ml? 2??
*May 31, 2015*

**chemistry**

what part of the meniscus must be read to accurately record the volume of a liquid in a graduated cylinder??? the lowest of the bubble?
*May 31, 2015*

**chemistry**

if 15.95 g dissolves in 100ml of water what will be the solubility in g/ml expressed to the proper number of significant figures?/ 15.95/100 =.0595
*May 31, 2015*

**Social Studies **

explain whether conflict was unavoidable in Colombia. Why or why not? i don't understand.
*May 20, 2015*

**math**

a ship leaves point A and travels 60 miles due east, then travels northward 59 degrees to point C, and travel 60 miles to point C, find the distance from point A to point C
*May 14, 2015*

**science(check answers)**

So there is no answer??
*May 12, 2015*

**chemistry**

yeah I'm not sure...an example in the book just equates them, its for a catalyzed reaction by saying k1/k2=(Ae^-Ea/RT)/(Ae^-Ea/Rt)=e^-Ea/RT but I'm not sure about that way.
*April 17, 2015*

**chemistry **

i'm stumped on how to write this in mathematical form. it says the rate increased by a factor of 2000, I am supposed to determine by what percent the Energy of activation will be reduced. The answer is 25% in the book. I dont know how they get the answer using this formula...
*April 17, 2015*

**Science**

In the ocean, there are area's where there are very few living things. _______ is the term that when this happens to a natural area.
*April 8, 2015*

**Chemistry**

1. What would be the effect on the reaction rate if the [O2] were doubled? 2. What would be the effect on the reaction rate if the pressure on the reaction were doubled? 3. Assume the reaction is reversible and at equilibrium. What shifts in the equilibrium of this reaction ...
*March 25, 2015*

**chemistry**

A scientist measures the standard enthalpy change for the following reaction to be -172.4 kJ : 2SO2(g) + O2(g) 2SO3(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of SO2(g) is what in kJ/mol?
*March 7, 2015*

**Science for ms. Sue**

It is false.. I agree with Bob!
*March 2, 2015*

**POL 201**

The Mayflower Compact was a type of early constitution because (Points : 1)
*February 26, 2015*

**Chemistry**

What is the molarity of a 2.50 x 102 cm3 solution containing 560.0 g of C6H12O6?
*November 6, 2014*

**English**

Write a paragraph in which you compare and contrast the motivations of Brutus and Cassius, and determine whether the ends justify the means. ("The ends justify the means" is simply saying that the good results, or "ends," make it acceptable, or "...
*October 28, 2014*

**stats**

a hat contains a number od cubes: 15 red, 10 white, 5 blue and 20 black,20 years gone and i am back again. one cube at random. what is the probability that it is: a) a red cube? b) not a red cube? c) a cube that is white or black? d) a cube that is neither white nor black? e) ...
*September 28, 2014*

**stats**

i need help with this Question The following data represents Total Credit Hours from our class survey. 90 54 98 45 65 43 12 48 56 12 15 60 38 18 67 125 50 43 26 64 22 52 69 You may use your calculator to find the following statistics: Mean __________ Median _______ Mode (if it...
*September 17, 2014*

**STATS**

i really need more help with A1, A2, B1, B2. the most
*September 17, 2014*

**STATS**

i need help with this Question The following data represents Total Credit Hours from our class survey. 90 54 98 45 65 43 12 48 56 12 15 60 38 18 67 125 50 43 26 64 22 52 69 You may use your calculator to find the following statistics: Mean __________ Median _______ Mode (if it...
*September 17, 2014*

**Stat**

1) one indicator of a outlier is that an observation is more than 2.5 standard deviations from the mean. Consider the data value 80. (a) if a data set has mean 70 and standard deviation 5, is 80 a suspect outlier? be sure to work that explains your answer (b) if a data set ha ...
*September 14, 2014*

**Stat**

when you are comparing two sets of data, and one set is strongly skewed and the other is symmetric, which measures of the center and variation should you choose for the comparison?
*September 14, 2014*

**chemistry**

what is the initial rate of the reaction, in mol/(L*s), under theswe conditions? Concentration=0.40 mol/L
*September 4, 2014*

**chemistry**

what is the initial rate of the reaction, in mol/(L*s) under these conditions? Concentration= 0.40 mol/L
*September 3, 2014*

**chemistry**

nitrosyl bromide, NOBr is formed from NO and Br2-. Experiments show that this reaction is second order in NO and first order in Br2. what is the rate equation for this reaction?
*September 3, 2014*

**chemistry**

The vapor pressure of ethanol is 54.68 mm Hg at 25oC. How many grams of chlorophyll , C55H72MgN4O5, a nonvolatile, nonelectrolyte (MW = 893.5 g/mol), must be added to 207.6 grams of ethanol to reduce the vapor pressure to 53.60 mm Hg ? ethanol = CH3CH2OH = 46.07 g/mol.
*August 26, 2014*

**chemistry**

calculate the Henry's law proportionality constant for N2? partial pressure at 1 atm=0.78 atm solubility at 1 atm= 5.3 x 10^-3 mol/L
*August 25, 2014*

**chemistry**

what is the solubility of N2 at a pressure of 10 atm? partial pressure at 1 atm=0.78 atm solubility at 1 atm= 5.3 x 10^-3 mol/L
*August 25, 2014*

**chem **

at a depth of 100m underwater the water pressure is equal to 10 atm of pressure. what is the partial pressure of N2 at a pressure of 10 atm?
*August 25, 2014*

**chemistry**

A 35.0g sample of ethylene glycol is dissolved in 500.0g of water. The vapor pressure of water at 32C is equal to 35.7mm Hg. What is the vapor pressure of the water-ethylene glycol solution at 32C?
*August 24, 2014*

**chemistry**

The concentration of CO2 in an unopened soda can is 0.0506 m at 25 C. What is the partial pressure of CO2 gas in the can?
*August 24, 2014*

**chemistry**

The partial pressure of O2 in your lungs varies from 25 mm Hg to 40 mm Hg. What mass of O2 can dissolve in 1.0L OF water at 25.0oC when the O2 partial pressure is 40. mm Hg?
*August 24, 2014*

**math**

Certain investments compound interest at different intervals. What effect does the size of the compounding interval have on the yield of the investment?
*June 30, 2014*

**Math**

How to sketch a visual model to find the total distance that Luke rode.
*April 22, 2014*

**math**

100 eighth grade students were interviewed about their favorite subject at school. 45 said Math, 70 said English, and 5 said neither. Using a Venn diagram, how many said both?
*March 10, 2014*

**math**

(a)Given the points P(3,5),Q(8,10)and R(8,0),find the equation of a line which is perpendicular to QR and passes through the mid point of QR. (b)The line 2x+3y=2 and 7x-3y=10 intersect at A . Find the equation of the line which passes through A and is perpendicular to the line...
*June 5, 2013*

**physics **

plz help
*June 5, 2013*

**Physics/Mechanics**

plz help
*June 5, 2013*

**chemistry**

how many moles of nh3 are produced from 16 grams of n2 ?
*May 21, 2013*