Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 341

**chemistry**

Liquid hexane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 43.9 g of hexane is mixed with 57. g of oxygen. Calculate the minimum mass of hexane that could be left over by the chemical reaction. Round your answer to significant ...
*March 7, 2015*

**Math**

Which of the following correctly lists angle pairs that have the same sums of 180 degrees & 90 degrees? A. adjacent angles, congruent angles B. complementary angles, vertical angles C. supplementary angles, complementary angles*** D. vertical angles, adjacent angles Is it C?
*February 25, 2015*

**physical science**

490 / 2= 245.
*February 25, 2015*

**physics**

1.A 910 kg racecar starts from rest and reaches a speed of 25.1 m/s in 0.48 s. a)What is the average acceleration of the racecar during this time period? b)What is the magnitude of the net force on the racecar? for a) I know: Mass= 910kg V=25.1m/s T=0.48s and I know to find A...
*February 19, 2015*

**math**

a shopkeeper after allowing a discount of 10% on the market price makes a profit of 8%.what percent above the cost price is it market.
*January 14, 2015*

**physica science**

when will the resultant of the two vectors be at maximum when two forces of 5n and 7n act on an object?
*January 14, 2015*

**business math**

1476.92
*June 4, 2014*

**Math**

How do you solve 6k-8=k+2???
*March 19, 2014*

**Math**

two angles are vertical. if angle A is 37 degrees, what is the measure of angle B?
*March 19, 2014*

**Math**

Two angles are supplementary.One angle measures 2 more than 3 times the other angle.what is the measure of each angle?
*March 19, 2014*

**Math**

A 12-foot ladder is leaning against a wall. The base of the ladder is 4 feet from the wall. How tall is the wall?
*March 19, 2014*

**English **

1-2. My uncle decided to splurge and _____with a country club because golf is his favorite____.(affiliate,deficit) 3-4. Gail didn't ____from smoking cigarettes until her employer made not smoking ____.Keeping her job was a very good incentive to get her to quit.(agnostic, ...
*March 18, 2014*

**math**

Social Security: 2821 Medicare: 659.75
*March 14, 2014*

**math**

7798.80
*March 14, 2014*

**math**

629.97
*March 8, 2014*

**Chemistry: HELP! PLEASE**

a) Addition of Na2S2O3 to I2+I-->I3 in an aqueous layer will turn the solution clear and colourless. Write an equation explaining this observed colour. b) Addition of Na2S2O3 to I2+I-->I3 in an varsol layer will turn the solution pink. Write and equation explaining this ...
*March 2, 2014*

**Chemistry**

I saw yellow thick cloudy liquid but no precipitate
*March 1, 2014*

**Chemistry **

Based on your observation, how would you precipitate BaCrO4 (s) from a solution of Ba(NO3)2 and K2Cr2O7 2-? Need to show chemical equation and explain.
*March 1, 2014*

**Math **

What equation cannot be solved and why?
*February 7, 2014*

**chemistry**

Divers know that the pressure exerted buy the water increases about 100kpa with every 10.2 m of depth. This means that at 10.2 m below the surface, the pressure is 201 kpa; at 20.4 m , the pressure is 301 Kpa; and so forth. Given that the volume of a balloon is 3.5L at STP and...
*February 7, 2014*

**English**

I'm doing a presentation on these vintage advertisement. (.)vh1(.)com(/)celebrity(/)bwe(/)images(/)2010(/)08(/)Skype-Retro-Ad(.)jpg This advertisement was produced by a Brazilian advertising agency for Maximidia Seminar (a seminar on communication) on 2010. I need to ...
*December 10, 2013*

**math**

6 ⅚ – 17/18 Solve the following problem and convert to lowest terms (mixed number)
*October 26, 2013*

**Mathematics**

If a 75 kg person pedals a Monarch leg ergometer at 50 rpm, how much resistance is needed to work at a level of 11 METs?
*October 6, 2013*

**Mathematics**

What stepping rate is needed if a person wants to work at a Vo2 of 45 mL/kg/min using a bench that is 34 cm high?
*October 6, 2013*

**Math**

If a 60 kg man is riding a Monarch ergometer at 50 rpm and the resistance is 2.0 kg, what is the power output?
*October 6, 2013*

**Math**

Who is working harder, Fred running a 10 min mile pace at a 10% grade or Pete who is 55 kg, cycling on a Monarch ergometer with a resistance of 2.5 kg and a pedal rate of 60 rpm?
*October 6, 2013*

**Math**

If an individual wants a work of 1300 kg m/min with a cycling speed of 300 m/min, how much resistance is needed?
*October 6, 2013*

**Math**

Determine the MET level for each activity for a 70 kg person. a.) 18 steps/min, 25 cm/step b.) 6 mph, 12% grade c.) 750 kg m/m on a Monarch ergometer d.) Arm cranking at 350 kg m/min on a Monarch ergometer
*October 6, 2013*

**Math**

What is the MET level of a person that is running on a level treadmill at 6 mph?
*October 6, 2013*

**Math**

What is the functional capacity in METs and Vo2 (mL/kg/min) of a 70 kg man who completed Stage V (3mph, 12.5% grade) of a Balke TM test?
*October 6, 2013*

**Math**

A patient must exercise a MET level of 8. What grade is needed if the speed is 3 mph?
*October 6, 2013*

**Chemistry**

How many grams of nitric acid (HNO3) must be dissolved in 740 mL of water to make a solution with a pOH = 8.3?
*May 12, 2013*

**Maths**

The second term in the expansion of (1-x)(1+2x)Λn is 19x. Find the value of n
*May 12, 2013*

**math**

The second term in the expansion of (1-x)(1+2x)Λ4 is 19x. Find the value of n
*May 10, 2013*

**math**

A rectangular plot is bounded at the back by a river. No fencing is needed along the river and there is to be an opening in front of about 24 meters. If the cost of fencing in front is $1500 per meter and the cost of fencing the sides is $1000 per meter, find the dimensions of...
*April 25, 2013*

**math**

A bag contains 5 red balls and 7 green balls . A ball is picked at random , its color is noted and it is given out . The bag is shaken and a second selection is made. A. Draw. Tree diagram to illustrate thr information. B. Calculate the probability that both balls are red
*April 24, 2013*

**Math**

A customer is buying a $100 drill and two $15 drill bit stes. The customer uses a $50 gift card for a portion of thier bill. How much cash will the customer pay (before taxes)?
*April 15, 2013*

**Algebra 2**

a.) the number of terms b.) the first term c.) the last term d.) evaluate the sum 5 E (3+n) n=1 8 E 2n/3 n=1 I dont know what the symbol is for the equation but it looks like an "E"
*February 26, 2013*

**physics**

A spherical surface completely surrounds a collection of charges. Find the electric flux (with its sign) through the surface if the collection consists of (a) a single +1.80 × 10-6 C charge, (b) a single -8.20 × 10-6 C charge, and (c) both of the charges in (a) and (b
*February 25, 2013*

**physics**

A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 12300 N/C. The mass of the water drop is 4.71 × 10-9 kg. How many excess electrons or protons reside on the drop?
*February 25, 2013*

**physics**

A string has a linear density of 8.1 x 10-3 kg/m and is under a tension of 200 N. The string is 2.9 m long, is fixed at both ends, and is vibrating in the standing wave pattern shown in the drawing. Determine the (a) speed, (b) wavelength, and (c) frequency of the traveling ...
*February 11, 2013*

**physics**

A container holds 2.2 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinetic energy of a 7.7x10-3 kg bullet with a speed of 650 m/s. What is the Kelvin temperature of the gas?
*January 28, 2013*

**physics**

The flywheel of an engine has a moment of inertia of 24 kg*m^2. a) if the radius of the wheel is 0.6m, what force is required to accelerate the wheel from rest to an angular velocity of 300 rpm in 6 seconds? b) how many turns does it make during this time?
*December 12, 2012*

**physics**

The flywheel of an engine has a moment of inertia of 24 kg*m^2. a) if the radius of the wheel is 0.6m, what force is required to accelerate the wheel from rest to an angular velocity of 300 rpm in 6 seconds? b) how many turns does it make during this time?
*December 12, 2012*

**science/math**

width of a normal sheet of paper is 8.5inches. Convert this length to kilometers
*November 17, 2012*

**Science**

A mixture is prepared by adding 100 ml of 0.10M Na2CrO4 to 100.ml of ).10 N AgNO3. A precipitate forms in this mixture. The precipitate is separated from the mixture by filtration. Question: What quantity of solid product is produced?
*November 2, 2012*

**math**

Morgan Company received from Lee Company an invoice dated September 27. Terms were 2-10 EOM. List price on the invoice was $5000.00(freight not included). Morgan receives a 9/7 chain discount. Freight charges are Morgans resposibility but Lee agreed to prepay the $150. freight...
*October 22, 2012*

**algebra 2**

4p + 2q = 8 and q = 2p +1 solve by substitution
*October 18, 2012*

**chemistry**

an ionic equation has 2H+(AQ)on the left side and H2(g) on the right. Are these species spectators? explain.
*October 15, 2012*

**trig**

Find the domain of each function. f(x)=Sqareroot of 5-x f(x)=x^3/x^2-16
*October 9, 2012*

**pre calculus**

Algebraically solve the system of equations using any method you wish 3x-10y+z=5 -4x+9y-z=-6 -13y+z=2
*October 7, 2012*

**drawing**

well my teacher miss whitcombe has told me to draw a hybrid creature from various parts of insects/machines can anyone help me? many thanks
*October 3, 2012*

**math**

you can multiply 90 times 30 and 9 times 8 and add them
*October 1, 2012*

**english**

1. c 2. b 3. c 4. a 5. a I got 5/5 (100%).
*September 20, 2012*

**pre calculus**

find the real zeros of f(x)=x^4+6x^3-11x^2-24x+28
*September 17, 2012*

**pre calculus**

solve the following inequality 4x-3/x+4 less than or equal too 3
*September 17, 2012*

**pre calculus**

1/3log(base7) x=2log(base7)4 Solve for x?
*September 17, 2012*

**physics**

In many countries, automatic number plate recognition is used to catch speeders. The system takes a time-stamped license plate photo at one location (like an on-ramp to a freeway), and then takes a second time-stamped photo at a second location a known distance from the first ...
*September 1, 2012*

**biology**

ya'll nuts
*August 24, 2012*

**Chemistry**

500ml of 0.250M Na2SO4 solution is added to an aqueous solution of 15.00 g of BaCl2 resulting in the formation of white precipitate of BaSO4. How many moles and how many grams of BaSO4 are formed?
*August 9, 2012*

**literature**

Is it B Ms. Sue? I believe it's B.
*July 22, 2012*

**physics**

Two resistors, 68.0 Ω and 74.0 Ω, are connected in parallel. The current through the second resistor is 4.60 A. (a) Determine the current in the first resistor? (b) What is the total power supplied to the two resistors?
*July 6, 2012*

**physics**

A moving particle encounters an external electric field that decreases its kinetic energy from 9100 eV to 6630 eV as the particle moves from position A to position B. The electric potential at A is -59.5 V, and the electric potential at B is +26.1 V. Determine the charge of ...
*July 4, 2012*

**physics**

but i need two ansers for the epe of charge 3 at point a and b. do I just multiply the vtotal by q3 then multiply each charge by that to get the numer for pt a and b
*July 4, 2012*

**physics**

more info needed here are the other charges q1= +1.5e-9 q2=+4.0e10-9
*July 4, 2012*

**physics **

The drawing shows a square, each side of which has a length of L = 0.25 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a third charge q3 = -4.35 10-8 C placed at corner A and then at corner B.
*July 4, 2012*

**physics **

A moving particle encounters an external electric field that decreases its kinetic energy from 9100 eV to 6630 eV as the particle moves from position A to position B. The electric potential at A is -59.5 V, and the electric potential at B is +26.1 V. Determine the charge of ...
*July 3, 2012*

**physics **

Two charges, -17 and +3.6 µC, are fixed in place and separated by 3.2 m. a) At what spot along a line through the charges is the net electric field zero? Locate this spot relative to the positive charge. (Hint: The spot does not necessarily lie between the two charges. (...
*July 3, 2012*

**physics **

An electric field of 264,000 N/C points due west at a certain spot. What are the magnitude and direction of the force that acts on a charge of -6.3 µC at this spot?
*July 3, 2012*

**physics 2**

Two charges, -17 and +3.6 µC, are fixed in place and separated by 3.2 m. (a) At what spot along a line through the charges is the net electric field zero? Locate this spot relative to the positive charge. (Hint: The spot does not necessarily lie between the two charges...
*July 2, 2012*

**physics 2**

An electric field of 264,000 N/C points due west at a certain spot. What are the magnitude and direction of the force that acts on a charge of -6.3 µC at this spot?
*July 2, 2012*

**physics**

The shock absorbers in the suspension system of a car are in such bad shape that they have no effect on the behavior of the springs attached to the axles. Each of the identical springs attached to the front axle supports 351 kg. A person pushes down on the middle of the front ...
*April 18, 2012*

**physics**

The shock absorbers in the suspension system of a car are in such bad shape that they have no effect on the behavior of the springs attached to the axles. Each of the identical springs attached to the front axle supports 351 kg. A person pushes down on the middle of the front ...
*April 18, 2012*

**physics**

Two disks are rotating about the same axis. Disk A has a moment of inertia of 3.7 kg · m2 and an angular velocity of +7.3 rad/s. Disk B is rotating with an angular velocity of -9.5 rad/s. The two disks are then linked together without the aid of any external torques, so...
*April 18, 2012*

**Physics**

A 9.67-m ladder with a mass of 25.0 kg lies flat on the ground. A painter grabs the top end of the ladder and pulls straight upward with a force of 242 N. At the instant the top of the ladder leaves the ground, the ladder experiences an angular acceleration of 1.94 rad/s2 ...
*April 18, 2012*

**physics**

Jahna and Raul move onto the setup for experiment 2. They have been asked to determine both the mass of the rod and the mass of the hanging object. They know the length of the rod, the position of the hanging mass, anf the positions and readings of the scales. Determine the ...
*April 16, 2012*

**physics**

Thank You!
*April 16, 2012*

**physics**

Two students, Jahna, and Raul, re performing Experiment 1. To simplify their calculations, each will apply their force perpendicular to the arm of the apparatus. Jahna attaches her spring scale 15cm from the pivot and pulls with a force of 2.5N. Raul attaches his springs scale...
*April 16, 2012*

**Physics**

A grindstone of radius 4.0m is initially spinning with an angular speed of 8.0 rad/s. The angular speed is then increased to 12 rad/s over 4.0s. Assume that the angular acceleration is constant. What is the average angular speed of grindstone?
*April 2, 2012*

**Physics**

The earth has a radius of 6.38 106 m and turns on its axis once every 23.9 h. A. What is the tangential speed (in m/s) of a person living in Ecuador, a country that lies on the equator? (b) At what latitude (i.e., the angle θ in the drawing) is the tangential speed two-...
*March 30, 2012*

**physics**

Some bacteria are propelled by biological motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velocity has a radius of 1.70e-8 m, and a tangential speed at the rim of 2.32 e-5 m/s. a) What is the angular speed (the magnitude of the ...
*March 30, 2012*

**Physics**

A wind turbine is initially spinning at a constant angular speed. As the wind's strength gradually increases, the turbine experiences a constant angular acceleration of 0.180 rad/s2. After making 2874 revolutions, its angular speed is 139 rad/s. A. What is the initial ...
*March 30, 2012*

**physics**

hi there thanks for trying to help, although my tutor has given the answer as 0.233m. So l am therefor still puzzled by this question ... please help!!!
*March 28, 2012*

**physics**

A block with a mass of 0.5kg is pushed against a horizontal spring of negligible mass and spring constant 450 N/m until the spring is compressed a distance x. When it is released, the block travels along a frictionless, horizontal surface to the bottom of a verticle circular ...
*March 28, 2012*

**physics**

A 1000kg car accelerates from rest to 30m/s over a distance of 20m. a) ignoring friction and air resistance, what is the power generated by the motor? b) if the friction and air resistance is 200N, what is the power generated by the motor?
*March 28, 2012*

**Physics**

ans = 17.85kgm/s^2
*March 17, 2012*

**physics**

The (nonconservative) force propelling a 1.50 103-kg car up a mountain road does 5.10 106 J of work on the car. The car starts from rest at sea level and has a speed of 31.5 m/s at an altitude of 1.90 102 m above sea level. Obtain the work done on the car by the combined ...
*March 14, 2012*

**Physics**

A pitcher throws a 0.140-kg baseball, and it approaches the bat at a speed of 45.0 m/s. The bat does Wnc = 65.0 J of work on the ball in hitting it. Ignoring air resistance, determine the speed of the ball after the ball leaves the bat and is 25.0 m above the point of impact.
*March 14, 2012*

**Physics**

Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.40 1011 m apart. The larger of the two stars has a mass of 3.40 1030 kg, and its center is 2.50 1011 m from the system's center of mass. What is the mass of the smaller star?
*March 13, 2012*

**Physics**

Two ice skaters have masses m1 and m2 and are initially stationary. Their skates are identical. They push against one another, as shown below, and move in opposite directions with different speeds. While they are pushing against each other, any kinetic frictional forces acting...
*March 13, 2012*

**physics**

By accident, a large plate is dropped and breaks into three pieces. The pieces fly apart parallel to the floor, with v1 = 3.15 m/s and v2 = 1.50 m/s. As the plate falls, its momentum has only a vertical component, and no component parallel to the floor. After the collision, ...
*March 13, 2012*

**physics**

A 1100-kg car is being driven up a 4.0° hill. The frictional force is directed opposite to the motion of the car and has a magnitude of f = 518 N. A force is applied to the car by the road and propels the car forward. In addition to these two forces, two other forces act ...
*March 13, 2012*

**physics**

A 1100-kg car is being driven up a 4.0° hill. The frictional force is directed opposite to the motion of the car and has a magnitude of f = 518 N. A force is applied to the car by the road and propels the car forward. In addition to these two forces, two other forces act ...
*March 13, 2012*

**Physics**

A car accelerates uniformly from rest to 21.0 m/s in 6.1 s along a level stretch of road. Ignoring friction, determine the average power required to accelerate the car if the weight of the car is the following. A) 8.0e3N B) 1.2e4N
*March 13, 2012*

**physics**

When I did this I got the answer 12.91 prior to you responding to me and when I tried the way you said I recieved the same answer but our software is telling me that its wrong and i tried twice.
*March 12, 2012*

**physics**

A baseball (m = 151 g) approaches a bat horizontally at a speed of 39.8 m/s (89 mi/h) and is hit straight back at a speed of 45.7 m/s (102 mi/h). If the ball is in contact with the bat for a time of 1.05 ms, what is the average force exerted on the ball by the bat? Neglect the...
*March 12, 2012*

**Physics**

A car accelerates uniformly from rest to 21.0 m/s in 6.1 s along a level stretch of road. Ignoring friction, determine the average power required to accelerate the car if the weight of the car is the following. A) 8.0e3N B) 1.2e4N (The answer needs to be in Watts)
*March 12, 2012*

**Physics**

A 1100-kg car is being driven up a 4.0° hill. The frictional force is directed opposite to the motion of the car and has a magnitude of f = 518 N. A force is applied to the car by the road and propels the car forward. In addition to these two forces, two other forces act ...
*March 12, 2012*