Wednesday

January 18, 2017
Total # Posts: 846

**physics**

A high-jumper, having just cleared the bar, lands on an air mattress and comes to rest. Had she landed directly on the hard ground, her stopping time would have been much shorter. Using the impulse-momentum theorem as your guide, determine which one of the following statements...

*January 17, 2017*

**physics**

A 2.9-kg cart is rolling along a frictionless, horizontal track towards a 1.5-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. At a certain instant before the carts ...

*January 17, 2017*

**physics**

In a science fiction novel two enemies, Bonzo and Ender, are fighting in outer spce. From stationary positions, they push against each other. Bonzo flies off with a velocity of +1.7 m/s, while Ender recoils with a velocity of -3.3 m/s. Determine the ratio mBonzo/...

*January 17, 2017*

**physics**

Two arrows are fired simultaneously with the same speed of 30.0 m/s. Each arrow has a mass of 0.100 kg. One is fired due east and the other due south. What is the magnitude of the total momentum of this two-arrow system?

*January 17, 2017*

**physics**

A 53.8-kg skater is standing at rest in front of a wall. By pushing against the wall she propels herself backward with a velocity of -1.33 m/s. Her hands are in contact with the wall for 0.960 s. Ignore friction and wind resistance. Find the average force she exerts on the ...

*January 17, 2017*

**physics**

The hail comes straight down at a mass rate of m/?t=0.0690 kg/s and an initial velocity of v0= -15.0 m/s. Suppose that the hail described there bounces off the roof of the car with a velocity of +14.0 m/s. Ignoring the weight of the hailstones, calculate the magnitude of the ...

*January 17, 2017*

**physics**

A car, starting from rest, accelerates in the +x direction as in the figure. It has a mass of 1.10 × 103 kg and maintains an acceleration of +4.40 m/s2 for 2.60 s. Assume that a single horizontal force (not shown) accelerates the vehicle. Determine the average power ...

*January 12, 2017*

**physics**

A 45-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 210 J from 400 J. How high does she rise during this interval? Neglect air resistance.

*January 12, 2017*

**physics**

A 64.2-kg skateboarder starts out with a speed of 2.21 m/s. He does 98.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -276 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...

*January 12, 2017*

**physics**

A 1450-kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16890 N on the submarine, as well as a downward resistive force of 1010 N. What is the submarine's acceleration?

*January 11, 2017*

**physics**

A worker stands still on a roof sloped at an angle of 43° above the horizontal. He is prevented from slipping by a static frictional force of 520 N. Find the mass of the worker.

*January 11, 2017*

**physics**

Part (a) of the drawing shows a bucket of water suspended from the pulley of a well; the tension in the rope is 56.0 N. Part (b) shows the same bucket of water being pulled up from the well at a constant velocity. What is the tension in the rope in part (b)?

*January 11, 2017*

**physics**

The drawing shows a wire tooth brace used by orthodontists. The top-most tooth is protruding slightly, and the tension in the wire exerts two forces, and , on this tooth in order to bring it back into alignment. If the forces have the same magnitude of 24....

*January 11, 2017*

**physics**

Three forces act on a moving object. One force has a magnitude of 76.5 N and is directed due north. Another has a magnitude of 46.3 N and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the object ...

*January 11, 2017*

**College Physics**

The space probe Deep Space 1 was launched on October 24, 1998. Its mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generated only a weak thrust, but it could do so over long periods of time with the ...

*January 11, 2017*

**physics**

Only two forces act on an object (mass=3.19 kg), as in the drawing. Find (a) the magnitude and (b) the direction (relative to the x axis) of the acceleration of the object.

*January 8, 2017*

**physics**

An apple crate with a weight of 225 N accelerates along a frictionless surface as the crate is pulled with a force of 14.5 N as shown in the drawing. What is the horizontal acceleration of the crate?

*January 8, 2017*

**physics**

A mountain climber, in the process of crossing between two cliffs by a rope, pauses to rest. She weighs 520 N. As the drawing shows, she is closer to the left cliff than to the right cliff, with the result that the tensions in the left and right sides of the rope are not the ...

*January 8, 2017*

**math**

The length of a rectangle is 7 units and its width is 5 units. What is the approximate length of the diagonal of the rectangle? A. 4.9 units B. 6 units C. 8.6 units D. 9 units

*December 16, 2016*

**math**

i need help with a problem wanting me to explain the differences between silver and gold using the terms atom and elements

*November 30, 2016*

**Biochemistry**

A signaling protein with both a SH2 and a SH3 domain binds to the phosphorylated form of its target protein with a Kd of 0.23 nM. The affinity of the SH3 domain by itself is 41 uM and the phosphotyrosine contact with the SH2 domain is responsible for 22 kJ/mol. What is the Kd ...

*November 28, 2016*

**history**

1. B 2. A 3. A 4. A,C 5. A 6. C 7. A and B 8. A 9. B 10. D 100% just took the quiz, I hope this help anyone.

*November 18, 2016*

**American Government**

R is right 1.B 2.D 3.A Thanks got a 100%

*November 17, 2016*

**Physics**

Consider two fly wheels labeled A and B both of which are spinning with the same angular velocity. Each flywheel consists of two small heavy spheres connected by very light rods to a light axis. Flywheel A has spheres of mass 2m, each a distance R from the axis. Flywheel B has...

*November 10, 2016*

**American Government**

someone have the answers?

*November 9, 2016*

**Math**

which of these prices is lower than 5 for $3.00

*November 7, 2016*

**American Government**

1. B 2. A 3. A 4. A,C 5. A 6. C 7. A and B 8. A 9. B 10. D 100% just took the quiz, I hope this help anyone.

*November 2, 2016*

**Geography**

Why did the neolithic agricultural revolution mark a turning point in history?

*November 2, 2016*

**American Gov.**

1. Which of the following examples are allowed under the Lemon test? Select all that apply. (2 points)Unselected answer (0 pts) financial aid for religious literature for religion classes in parochial schools Partially correct answer (1 pt) financial aid for student lunches ...

*November 2, 2016*

**Physics**

The 500 kg video display will be raised to its position 20 m above the arena floor by a motorized winch powered by a 12 volt battery. If the battery capacity is 100 A-hr and the system is 100% efficient, how many times could the display be lifted into position before the ...

*October 14, 2016*

**Calculus**

Find an equation of the tangent line to the graph of f at the given point. f(x) = x + (4/x), (4,5) I tried using the limit process a lot, but it didn't quite work. If possible, please use the limit process. Thanks a lot to whoever answers this question.

*September 27, 2016*

**Chemistry**

Water drips from a faucet into a flask at the rate of two drops every 5 seconds. A milliter of water is 20 drops. What volume of water, in liters, will be collected in 2.5 hours.

*September 26, 2016*

**World History**

a b b d a cc c b d

*September 22, 2016*

**Geometry**

Triangle ABC is given by the points A(1,1), B(3,2), C(2,3). Consider each rule of transformation. Does the rule result in an image with points A'(2,2), B'(6,3), and C'(4,4). (x,y) transforms into (x,y+1) y/n (x,y) transforms into (2x,2y) y/n (x,y) transforms into (...

*September 22, 2016*

**Geometry**

For two angles, <ABC and <DBC, m<ABC = 30 and <DBC is its complement. Ray BE is the angle bisector of <ABD. Consider each angle. Does the angle have a measure of 45 degrees? <DBC True or False <ABE True or False <DBE True or False

*September 22, 2016*

**Math**

A bag contains 7 white, 15 blue, 14 red, 10 yellow, and 4 green marbles. What is the probability of selecting a white marble first and a green marble second?

*September 19, 2016*

**Algebra**

1+n ____ =4 4

*September 10, 2016*

**Alg 1**

To earn a B in your Algebra class, you must achieve an unrounded test average between 84 and 86 (inconclusive). You scored 86,85, and 80 on the first three tests of the grading period. What possible scores can you earn on the fourth and final test to earn a B in the course?

*September 7, 2016*

**math**

Four friends shared a candy bar. The first friend ate 1/4 of the candy bar, the second friend ate 1/3 of the candy bar, and the third friend ate 1/6 of the candy bar. How much of the candy bar did the fourth friend eat? (Leave your answer as a fraction in lowest terms.)

*September 6, 2016*

**PHYSICS**

Runner A is initially 5.3 km west of a flagpole and is running with a constant velocity of 8.1 km/h due east. Runner B is initially 4.7 km east of the flagpole and is running with a constant velocity of 7.8 km/h due west. How far are the runners from the flagpole when their ...

*August 29, 2016*

**Science**

In order to analyze the wastewater containing cu2+ from a manufacturing process, 1.0L of water was evaporated to 10.0mL, then placed in a spectrophotometer tube. The absorbance was found to be 0.30. Using your calibration curve, calculate the number of milligram of Cu2+ in 1....

*June 7, 2016*

**Econ**

So would that still mean the economy would improve since the retirement pays can be a sort of incentive to draw in more people into that town.

*May 29, 2016*

**Econ**

Wouldn't the economy improve as well since there are more consumers and workers are able to continue working and producing products??

*May 29, 2016*

**Econ**

What will result from an increased life expectancy and improved health care?

*May 29, 2016*

**Math**

Anybody?

*May 18, 2016*

**Math**

Jacob mixes the letters J,K,L,J,K,M,N and P throughly. Without looking Terry draws one letter. Expressed as a fraction, decimal and percentage what is the probability the K will NOT be the letter terry selects A. 1/4,0.25,25% B.3/4,0.75,75% C. 4/3,1.33%, 13.3% D. 5/8,0.625,62...

*May 18, 2016*

**Physics**

An object of weight W hangs by three ropes as shown above. What is the value of the angle @ if T1 = T2 = W? ____________ \@ @/ T2\ /T1 \__/ |W| a) 15 b) 30 c) 40 d) 45 e) 60

*May 9, 2016*

**Chemisty**

V1M1=V2M2

*April 21, 2016*

**Chemistry<--------**

Sulfur dioxide in the effluent gases from coal-burning electric power plants is one of the principal causes of acid rain. One method for reducing SO2 emissions involves partial reduction ofSO2 to H2S followed by catalytic conversion of the H2S and the remaining SO2 to ...

*April 21, 2016*

**Chemistry**

Bumping this for help.

*April 12, 2016*

**Chemistry**

Calculate the pH of 0.250 L of a 0.65 M formic acid (HCO2H) - 0.10 M sodium formate (HCO2Na) buffer before (on your own) and after the addition of (a) 0.010 mol of NaOH (on your own) and (b) 0.010 mol of HCl (in the blank). Assume that the volume remains constant. I need help.

*April 12, 2016*

**english**

need help with essay

*March 29, 2016*

**Heath**

Shortly after quitting a smoker will A. Develop shortness in breath B. Regain their senses of smell and taste C. Lose circulation in their hands and feet D. Develop rapid Heart beats**

*March 14, 2016*

**Health**

Thanks!

*March 11, 2016*

**Health**

So then it is bronchitis ?

*March 11, 2016*

**Health**

A respiratory disorder in which the bronchi become inflamed and thick mucus in produced is called Asthma** Bronchitis Cancer Addiction Let me know if I'm right or wrong. Thanks

*March 11, 2016*

**Math**

A basketball team recently scored a total of 92 points on a combination of 2-point field goals, 3-point field goals, and 1-point foul shots. Altogether, the team made 51 baskets and 22 more 2-pointers than foul shots. How many shots of...

*March 9, 2016*

**Math**

Thanks!!

*March 9, 2016*

**Math**

Use the function rule to complete the table. -10x + y = 4 X -2 -1 0 1 2 Y * * * * *

*March 9, 2016*

**Math**

Find the function rule x -2 -1 0 1 2 Y 9 4 -1 -6 -11

*March 9, 2016*

**Math**

Karina has an 8 1/2inch by 11inch sheet of paper.She wants to leave a 3/4 inch margin on all 4 sides. What are the dimensions of the remaining area.

*March 7, 2016*

**Math**

Karina has an 8.5in by 11in sheet of paper.She wants to leave a 3-4ths inch margin on all 4 sides.What are the dimensions of the remaining area.

*March 7, 2016*

**Science**

A girl standing on a bridge throws a stone vertically downward with an intial velocity of 15.0 m/s into the river below. If the stone hit's the water 2.00 seconds later what is the height of the bridge above the water?

*March 3, 2016*

**Physics**

A girl standing on a bridge throws a stone vertically downward with an initial velocity of 15.0 m/s into the river below. If the stone hit's the water 2.00 seconds later what is the height of the bridge above the water?

*March 3, 2016*

**Math**

Give examples of three functions and three relations, using at least three different representations (e.g., symbolic representations, graphical representations, diagrams, tables of values, lists of ordered pairs). Use the definitions for function and relations to justify why ...

*March 3, 2016*

**Geometry**

If theta is an acute angle of a right triangle and cos theta equals 3/8, what is the value of csc theta?

*February 28, 2016*

**Algebra**

there is not graph provided

*February 24, 2016*

**Algebra**

The problem has two related parts 1) let a be an arbitrary real number. Find the distance between the point (1,2) and the point (4,a). (answer should be an algebraic expression in terms of a). 2) find the value of b for which the point (0,b) is equidistant from (4,4) and (5,-4...

*February 24, 2016*

**Algebra**

there is not graph...

*February 24, 2016*

**Physics**

Research stations in Siberia, Antarctica, and other remote locations use human power. People at the stations turn pedals, similar to bicycle pedals, that are connected to electrical generators. A researcher wants to investigate the power output of a person at a research ...

*February 15, 2016*

**Math**

32,48,72,108...Arithmetic or geometric I think it is arithmetic Then Find common difference or ratio multiple of 12? What are the next 3 terms 120,132,144 What is the "zero" term 12 not sure what this means though What is the equation? 12n * n

*February 9, 2016*

**Math**

A principal of $2000 was invested in a savings account for 4 years. If the interest earned for that period was $480 what is the interest rate? I = prt for r I did: 2000= 480(4) 2000=1920 9.6%

*February 1, 2016*

**Math**

The track team ran a mile and a quarter during its practice. How many kilometers did the team run?

*January 27, 2016*

**Physics**

570.0762 kg

*January 27, 2016*

**College algebra**

It took Eric 8 hours to drive to a job interview. On the way home, he was able to increase his average speed by 18mph and make the return drive in only 5 hours. Find his average speed on the return drive. Rate x time =distance Original drive- x. ____ _____ Return drive- ____ ...

*January 24, 2016*

**math**

Kate’s garden measures 15 yards by 12 yards. In order to make a path around it, she will need to reduce the size of her garden. The dimensions of the smaller garden will be related by a scale factor of 0.7. What is the area of the path around the garden in square yards? ...

*January 13, 2016*

**Math**

Ralph had 3/4 of a pie left. He divided this into six equal sized slices. What fraction of the original pie was eaten?

*December 14, 2015*

**College Algebra**

You have a credit card with a balance of $3000. Each month the minimum payment is 2.5% of the balance. The monthly interest rate is 1.5% of the balance. You decide you would like to pay off this card by making the minimum payment each month. You cut up the card so that you ...

*December 1, 2015*

**Physics**

1. The problem statement, all variables and given/known data A 2.0-m measuring stick of mass 0.175 kg is resting on a table. A mass of 0.500 kg is attached to the stick at a distance of 74.0 cm from the center. Both the stick and the table surface are frictionless. The stick ...

*November 30, 2015*

**Physics**

i meant t

*November 30, 2015*

**Physics**

Okay so for t = 0.850 s I would plug in 0.850 for R?

*November 30, 2015*

**Physics**

At t = 0 s,a particle of mass 7.08 kg starts from rest at the origin and moves with a velocity v = 6.00t^2i(hat) − 6.00tj(hat) + 6.00k(hat) m/s. 1. What is the angular momentum of the particle at t = 0 s I know angular is calculated from moment of inertia * angular ...

*November 30, 2015*

**Statistics**

Find the critical value za/2 that corresponds to a=0.12.

*November 20, 2015*

**Algebra 2**

A single engine aircraft can fly 120 mph in still air. If the aircraft can fly 490 miles flying with the wind in the same amount time it can fly 350 miles when flying against the wind, what is the speed of the wind? I can't figure out how to set up the equation.

*November 17, 2015*

**Algebra 2**

Thanks you so much Anonymous 100%

*November 8, 2015*

**Chemistry**

It's 0.854 M NaOH solution react completely with 2.1 L of a 0.972 M BaCl2. It's a 2:1 but I see what I did. Late nights sometimes mess with ya. Thank you. Might need help In the future.

*October 28, 2015*

**Chemistry**

Thanks. The problem I was having, I would multiply the grams by the molar mass by everything else I done was correct to what you were saying. What I don't understand is why you divide and not multiple(I do this for when it says a volume of somthing and get the right answer)

*October 28, 2015*

**Chemistry**

Ok so you take 3.141g and divide that by 90.036?

*October 28, 2015*

**Chemistry**

2 KMnO4 + 5 H2C2O4 + 3 H2SO4 ---> 2 MnSO4 + 10 CO2 + 8 H2O + K2SO4 How many milliliters of a 0.123 M KMnO4 solution is needed to react completely with 3.141 of oxalic acid? Please help I've worked this every way I know.

*October 28, 2015*

**Physics**

The mass of a beetle is 0.000004kg. If a beetle's center of mass rises 0.75 mm while it is pushing against the floor and then continues to travel up to a height of 250 mm above the floor, what is the magnitude of the force exerted by the floor on the beetle?

*October 22, 2015*

**Science**

An object has a length of 5.2 cm a width of 3 cm and a height of 1.5 cm what's the volume

*October 11, 2015*

**Math**

A train from York to Dalton left at the same time as a train from Dalton to York. One train traveled 68 kilometers per hour, and the other traveled 62 kilometers per hour. The trains met in 5 hours. How far is it from York to Dalton?

*September 28, 2015*

**Physics**

Police find skid marks 65.0 m long on a highway showing where the car made an emergency stop. Assuming the acceleration was -10.3 m/s^ ( about the maximum for dry pavement) how fast was the car going?

*September 19, 2015*

**social studies**

Age of Enlightenment

*September 15, 2015*

**Physics**

An object is traveling at a constant speed of 12.0 m/s when it slows to a stop. If it takes 10.0 m for the object to stop, what is the magnitude of its acceleration?

*September 9, 2015*

**Equilibrium**

So the answer would be 12811.12?

*August 3, 2015*

**Equilibrium**

So basically, the temperature is there just to be there?

*August 3, 2015*

**Equilibrium**

An equilibrium mixture at 852 K is found to contain 3.61*10^-3 mol/L of SO2, 6.11*10^-4 mol/L of O2, and 1.01*10^-2 mol/L of SO3. Calculate the equilibrium constant Keq, for the reaction where SO2 and O2 are reactants and SO3 is the product. Equation would be: 2SO2 + O2 <...

*August 3, 2015*

**Equilibrium**

nevermind figured it out

*August 3, 2015*