Thursday

February 23, 2017
Total # Posts: 888

**Math**

Thank you

*February 21, 2017*

**Math **

use the remainder theorem to find the remainder when P(x) = x^4-9x^3-5x^2-3x+4 is divided by x + 3 please help me start this problem I have no idea

*February 21, 2017*

**Math**

Using this formula... E=10^(1.5m+11.4) How much more energy is released in an M = 8.3 earthquake than in an average quake of magnitude M = 6.2? (Round your answer to the nearest integer.)

*February 14, 2017*

**Calculus**

M = log(E)-11.4/1.5 How do you express E in terms of M?

*February 14, 2017*

**physics**

United States currency is printed using intaglio presses that generate a printing pressure of 8.1 x 104 lb/in2. A $20 bill is 6.1 in. by 2.6 in. Calculate the magnitude of the force (in pounds) that the printing press applies to one side of the bill.

*February 7, 2017*

**physics**

An airtight box has a removable lid of area 2.87 × 10-2 m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 7.20 × 104 Pa. The inside of the box is completely evacuated. What is the magnitude of the force required to ...

*February 7, 2017*

**physics**

Accomplished silver workers in India can pound silver into incredibly thin sheets, as thin as 3.00 x 10-7 m (about one hundredth of the thickness of a sheet of paper). Find the area of such a sheet that can be formed from 3.70 kg of silver.

*February 7, 2017*

**physics**

Two chambers are filled with a fluid. The ceiling of chamber 1 is at the same level as the floor of chamber 2. The pressure at the floor of chamber 2 is 1.2 × 105 Pa. If the area of the ceiling of chamber 1 is 2.0 m2, what is the magnitude F of the force exerted by the ...

*February 7, 2017*

**physics**

The drawing shows two blocks that are placed at the ends of a massless board. The board is balanced on a support that serves as an axis of rotation. The block on the left has a mass of 5.8 kg. What is the moment of inertia of this system about the axis of rotation?

*February 3, 2017*

**physics**

The drawing shows three objects rotating about a vertical axis. The mass of each object is given in terms of m0, and its perpendicular distance from the axis is specified in terms of r0. Rank the three objects according to their moments of inertia, largest to smallest.

*February 3, 2017*

**physics**

A hiker, who weighs 811 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3350 N, and rests on two concrete supports, one on each end. He stops 1/6 of the way along the bridge. What is the magnitude of the force that a ...

*February 3, 2017*

**physics**

The figure shows a jet engine suspended beneath the wing of an airplane. The weight of the engine is 12600 N and acts as shown in the figure. In flight the engine produces a thrust of 69100 N that is parallel to the ground. The rotational axis in the figure is perpendicular to...

*February 1, 2017*

**physics**

The drawing illustrates an overhead view of a door and its axis of rotation. The axis is perpendicular to the screen. There are four forces acting on the door, and they have the same magnitude. Rank the torque ? that each force produces, largest to smallest.

*February 1, 2017*

**physics**

An auto race takes place on a circular track. A car completes one lap in a time of 22.8 s, with an average tangential speed of 37.3 m/s. Find (a) the average angular speed and (b) the radius of the track.

*February 1, 2017*

**physics**

The earth spins on its axis once a day and orbits the sun once a year (365 1/4 days). Determine the average angular velocity (in rad/s) of the earth as it (a) spins on its axis and (b) orbits the sun. In each case, take the positive direction for the angular displacement to be...

*February 1, 2017*

**physics**

The table that follows lists four pairs of initial and final angles of a wheel on a moving car. The elapsed time for each pair of angles is 1.5 s. For each of the four pairs, determine the average angular velocity (magnitude and direction as given by the algebraic sign of your...

*February 1, 2017*

**physics**

A pitcher throws a curveball that reaches the catcher in 0.65 s. The ball curves because it is spinning at an average angular velocity of 350 rev/min (assumed constant) on its way to the catcher's mitt. What is the angular displacement of the baseball (in radians) as it ...

*February 1, 2017*

**physics**

A meter stick is rotated about the end labeled 0.00 cm, so that the other end of the stick moves through an arc length of 6.04 cm. Through what arc length s does the 25.0-cm mark on the stick move?

*February 1, 2017*

**MATH**

Which expression calculates the time in hours an object takes to travel 38 miles at a speed of 2 m/h ? 38+2 382 38?2 38?2

*January 31, 2017*

**physics**

The National Aeronautics and Space Administration (NASA) studies the physiological effects of large accelerations on astronauts. Some of these studies use a machine known as a centrifuge. This machine consists of a long arm, to one end of which is attached a chamber in which ...

*January 26, 2017*

**physics**

Car A uses tires for which the coefficient of static friction is 0.222 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 19.5 m/s. Car B uses tires for which the coefficient of static friction is 0.670 on the same curve. What is ...

*January 26, 2017*

**physics**

A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the ...

*January 26, 2017*

**physics**

A computer is reading data from a rotating CD-ROM. At a point that is 0.0302 m from the center of the disk, the centripetal acceleration is 284 m/s2. What is the centripetal acceleration at a point that is 0.0803 m from the center of the disc?

*January 26, 2017*

**physics**

Computer-controlled display screens provide drivers in the Indianapolis 500 with a variety of information about how their cars are performing. For instance, as a car is going through a turn, a speed of 87.5 m/s and centripetal acceleration of 2.48 g (2.48 times the ...

*January 26, 2017*

**physics**

There is a clever kitchen gadget for drying lettuce leaves after you wash them. It consists of a cylindrical container mounted so that it can be rotated about its axis by turning a hand crank. The outer wall of the cylinder is perforated with small holes. You put the wet ...

*January 26, 2017*

**physics**

Speedboat A negotiates a curve whose radius is 140 m. Speedboat B negotiates a curve whose radius is 295 m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of the boats?

*January 26, 2017*

**physics**

A car travels at a constant speed around a circular track whose radius is 2.66 km. The car goes once around the track in 200 s. What is the magnitude of the centripetal acceleration of the car?

*January 26, 2017*

**Algebra 2**

Answers for the unit 6 lesson 2 Polynomials, Linear Factors, and Zeroes 1. B 4x(x-4)(x+6) 2.D 0,-2,-5 3. B 4. B 5. C - 105ft^3

*January 25, 2017*

**Algebra 2 **

What is the relative maximum and minimum of the function? f(x) = 2x^3 + x^2 -11x A - The realative maximum is at (-1.53,8.3) and the realative minimum is at (1.2,-12.01) B - The realative maximum is at (-1.53,12.01)and the realative minimum is at (1.2, -8.3) C - The realative ...

*January 25, 2017*

**Chemistry **

How many moles of carbon are in a 28.0g sample? I have no idea where to start

*January 24, 2017*

**Chem**

Consider the following generic equation: 3A + B ---> 2C + D 2.0 mol A and 1.0 mol B react to form 1.0 mol C. What is the percent yield of this reaction? Please help! thanks!

*January 22, 2017*

**physics**

A 3.67-g bullet, traveling at a speed of 484 m/s, strikes the wooden block of a ballistic pendulum, such as that in Figure 7.14. The block has a mass of 186 g. (a) Find the speed of the bullet/block combination immediately after the collision. (b) How high does the combination...

*January 19, 2017*

**physics**

After skiding down a snow-covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of +2.5 m/s. Miranda runs after her at a velocity of +4.7 m/s and hops on the inner tube. How fast do the two of them slide across the snow together on ...

*January 19, 2017*

**physics**

A two-stage rocket moves in space at a constant velocity of +4660 m/s. The two stages are then separated by a small explosive charge placed between them. Immediately after the explosion the velocity of the 1240-kg upper stage is +5570 m/s. What is the velocity (magnitude and ...

*January 19, 2017*

**physics**

A 0.540-kg ball is dropped from rest at a point 2.30 m above the floor. The ball rebounds straight upward to a height of 1.10 m. Taking the negative direction to be downward, what is the impulse of the net force applied to the ball during the collision with the floor?

*January 19, 2017*

**physics**

A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of +16.0 m/s, while the exiting water stream has a velocity of -16.0 m/s. The mass of water per second that strikes the blade is 41.0 kg/s. ...

*January 19, 2017*

**physics**

Two particles are moving along the x axis. Particle 1 has a mass m1 and a velocity v1 = +4.3 m/s. Particle 2 has a mass m2 and a velocity v2 = -6.3 m/s. The velocity of the center of mass of these two particles is zero. In other words, the center of mass of the particles ...

*January 19, 2017*

**physics**

The drawing shows three particles that are moving with different velocities. Two of the particles have mass m, and the third has a mass 2m. The third particle has a velocity of v3 = +5.1 m/s. At the instant shown, the center of mass (cm) of the three particles is at the ...

*January 19, 2017*

**physics**

Four very thin rods, each 13 m long, are joined to form a square, as part (a) of the drawing shows. The center of mass of the square is located at the coordinate origin. The rod on the right is then removed, as shown in part (b) of the drawing. What are the x- and y-...

*January 19, 2017*

**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*