Friday

December 9, 2016
Total # Posts: 2,882

**Physics**

Astronomers can calculate the mass of a planet by using the orbital parameters of one of its moons. Consider a hypothetical planet, which has a hypothetical moon that orbits the planet in a roughly circular orbit with a radius of 3.95*10^8 m. The moon takes 12 Earth days to ...

*October 23, 2012*

**PHYSICS**

A block of mass 0.86 kg is suspended by a string which is wrapped so that it is at a radius of 0.061 m from the center of a pulley. The moment of inertia of the pulley is 4.60×10-3 kg·m2. There is friction as the pulley turns. The block starts from rest, and its ...

*October 21, 2012*

**physics!!**

The two masses (m1 = 4.96 kg and m2 = 2.90 kg) in the Atwood's machine shown in the figure below are released from rest, with m1 at a height of 0.800 m above the floor. When m1 hits the ground its speed is 0.203 m/s. Assuming that the pulley is a uniform disk with a radius...

*October 21, 2012*

**physics**

The wire makes a 60 degree angle from the right end of the board to the upper left. The beam is attached at a 90 degree angle to the wall on the left

*October 21, 2012*

**physics**

A hungry 675 -N bear walks out on a beam in an attempt to retrieve some "goodies" hanging at the end. The beam is uniform, weighs 250 N, and is 5.00-m long; the goodies weigh 110 N. When the bear is at x = 1.00 m, find the tension in the wire and the components of ...

*October 21, 2012*

**physics**

To determine the location of his center of mass, a physics student lies on a lightweight plank supported by two scales L = 2.44 m apart. If the left scale reads 309 N, and the right scale reads 125 N, calculate the student's mass. Calculate the distance from the student&#...

*October 21, 2012*

**physics**

That is exactly the way I have been doing this problem and I keep getting the wrong answer. I keep getting 2.831 m/s

*October 19, 2012*

**physics**

After you pick up a spare, your bowling ball rolls without slipping back toward the ball rack with a linear speed of v = 3.27 m/s To reach the rack, the ball rolls up a ramp that rises through a vertical distance of h = 0.572 m. What is the linear speed of the ball when it ...

*October 19, 2012*

**Science**

Calculate the molarity of the following solution: 7.48g of calcium chloride (CaCl2) in 215 mL of aquous solution.

*October 19, 2012*

**Algebra 2**

consider the interior angles of the triangle with vertices p=(=4.39,-0,948) q=(3.03,8.31) r=(4.21,6.54) find the angle of the vertex of p answer in units of degrees find the angle of vertex q answer in units of degrees

*October 18, 2012*

**Algebra 2**

a total of $1381.8 per year is received in interest from three investments. the interest rates for the three investments are 4.9%, 7.5%, and 8.6%. the 4.9$ investment is half of the 7.5% investment and the 7.5% investment is 1400 less than the 8.6% investment. find the amount ...

*October 18, 2012*

**algebra 2**

find the area of the sector of the disk of radius r=16 and with arc length s=16

*October 18, 2012*

**math**

Perform the indicated operation. (r4 - r2 + 4) ÷ (r2 - r + 2) r² + r - 2 r² + r - 2 R -4r r² + r - 2 R -4r+8

*October 18, 2012*

**physics **

A high-speed photograph of a club hitting a golf ball is shown in the figure below. The club was in contact with a ball, initially at rest, for about 0.0013 s. If the ball has a mass of 55 g and leaves the head of the club with a speed of 1.2X10^2 ft/s, find the average force ...

*October 17, 2012*

**Physics **

A high-speed photograph of a club hitting a golf ball is shown in the figure below. The club was in contact with a ball, initially at rest, for about 0.0013 s. If the ball has a mass of 55 g and leaves the head of the club with a speed of 1.2 102 ft/s, find the average force ...

*October 17, 2012*

**physics**

a student stands on an elevator scale at rest on the 64th floor of a building. the scale reads 847 N. As the elevator moves up the scales increases to 923 N, then decreases back to 847 N. the acceleration of gravity is 9.8m/s^2. Answer in units of m/s^2

*October 15, 2012*

**science**

No idea

*October 15, 2012*

**physics**

77 m/s

*October 11, 2012*

**English**

When I stay at the farm, I do many working and helping job's. Last week I rode on the high speed tractor my uncle owns By the end of the day I really enjoyes having time left for relaxation

*October 10, 2012*

**English**

Writing with Possessive Nouns Directions Use possessive nouns or strong nouns to replace each capital lettered phrase. EXAMPLE:THE SADDLE THAT BELONGS TO MY HORSE is made of leathe. My horse's saddle is made of leather. 1.When I stay at the farm, I do many JOBS THAT INVOLE...

*October 10, 2012*

**Physics**

a horizontal force of magnitude 18.0 N is applied to a 3.07 kg book as the book slides a distance d = 0.34 m up a frictionless ramp at angle è = 30°. The book begins with zero kinetic energy. What is its speed at the end of the displacement?

*October 9, 2012*

**Honors Algebra 2**

How do you simplify terms like 3z^2 x 2z^3?

*October 9, 2012*

**Social studies**

places that have the same or common characteristics are referred to as.

*October 8, 2012*

**physics**

An 8.82g bullet is fired into a 235g block that is initially at rest at the edge of a table of h = 1.05 m height (see the figure below). The bullet remains in the block, and after the impact the block lands d = 2.16 m from the bottom of the table. Determine the initial speed ...

*October 7, 2012*

**physics**

A bicycle has wheels with a diameter of 0.630 m. It accelerates uniformly and the rate of rotation of its wheels increases from 197 rpm to 300 rpm in a time of 22.5 s. Find the linear acceleration of the bicycle

*October 7, 2012*

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.82 revolutions in 1.48 s before reaching its final angular speed. Calculate its angular acceleration

*October 7, 2012*

**physics**

a 4 kg mass is dropped on a spring below. the mass falls 2 meters before stopping and the spring compresses 40 cm in the process. what is the spring constant?

*October 6, 2012*

**physics!!**

An 8.82g bullet is fired into a 235g block that is initially at rest at the edge of a table of h = 1.05 m height (see the figure below). The bullet remains in the block, and after the impact the block lands d = 2.16 m from the bottom of the table. Determine the initial speed ...

*October 6, 2012*

**CHEMISTRY! HELP!**

9.47*10^12 km or 9.47e12 km

*October 6, 2012*

**physics**

A roller-coaster vehicle has a mass of 400 kg when fully loaded with passengers. r1 = 11 m and r2 = 17 m. If the vehicle has a speed of 17 m/s at A, what is the magnitude of the force that the track exerts on the vehicle at this point?

*October 4, 2012*

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.82 revolutions in 1.48 s before reaching its final angular speed. Calculate its angular acceleration.

*October 4, 2012*

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.82 revolutions in 1.48 s before reaching its final angular speed. Calculate its angular acceleration.

*October 4, 2012*

**physics**

Which of the following correctly describe the gravitational attraction between Earth and the Moon? -The Earth and the Moon exert equal size gravitational forces on each other. -The gravitational force of the Moon on the Earth is towards the Moon. -Both the Earth and the Moon ...

*October 4, 2012*

**Is this right?**

I think you made a slight error in moving your variables around; the equation should look like this: 6y = 4x - 9 To have the equation in y = mx + b form, you need to make sure there is no coefficient in front of the y variable. To do this, divide both sides by 6: y = (2/3)x...

*October 3, 2012*

**General Chemistry**

What is the velocity of an electron ejected, if any, from a piece of metal whose work function is 2.227 x 10^-19 J when a photon whose wavelength is 319 nm hits the metal in a vacuum? I know the answer is 9.372 x 10^5 m/s, but I am not entirely sure of how to get to this ...

*October 3, 2012*

**math**

With there being 5 shelves in the bookcase and each one taking up an inch of space inside the bookcase, there are 54 inches of space available. (59 - 5 = 54) This number is the amount of available shelf space to put books. With 5 shelves, there are 6 spaces to put books. ...

*October 3, 2012*

**English**

I'm supposed to write a two paragraph anecdote.

*October 1, 2012*

**English**

I need to write an anecdote, and I was wondering if my story of the flight to cancun , if that was an anecdote, or if a day in canada would be an anecdote.

*October 1, 2012*

**English**

Would "the flight to cancun" be an anecdote or a memoir? Would "a day in Canada" be an anecdote or a memoir?

*October 1, 2012*

**physics**

A 29.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 17.00 m. When she is partway down the slide, at a height h2 of 8.00 m, she is moving at a speed of 6.90 m/s. Calculate the mechanical energy lost due to friction

*September 30, 2012*

**College Physics**

If the spring is compressed a distance of 0.150 m and the gun fired vertically as shown, the gun can launch a 27.6g projectile from rest to a maximum height of 16.1 m above the starting point of the projectile. Neglecting all resistive forces, determine the spring constant. ...

*September 30, 2012*

**PHYSICS**

Sue and Jenny kick a soccer ball at exactly the same time. Sues foot exerts a force of 40.6 N to the north. Jennys foot exerts a force of 84.8 N to the east. What is the magnitude of the resultant force on the ball. Answer in units of N. What is the direction Of the resultant ...

*September 30, 2012*

**PHYSICS**

Two lifeguards pull on ropes attached ton a raft. If they pull in the same direction, the raft experiences a net external force of 341 N to the right. If they pull in opposite directions, the raft experiences a net external force of 170 N to the left. Find the magnitude of the...

*September 30, 2012*

**Chemistry**

How many milliliters of a 0.81 M HCl solution are needed to react completely with 2.2 g of zinc to form zinc(II) chloride?

*September 29, 2012*

**Math**

Which one of these five words does not belong and why: Acupuncture Puppet Corpuscle Juniper Repulsion

*September 26, 2012*

**math**

Which one of these five words does not belong and why: Acupuncture Puppet Corpuscle Juniper Repulsion

*September 26, 2012*

**English**

Thank you

*September 25, 2012*

**English**

Which sentence contains a helping verb? A. The group of small children startled the ducklings. B. I walked to the movie theater. C. A small snake slithered across the yard. D. Sophia will be taking swimming lessons for the first time.

*September 25, 2012*

**math**

I disagree with all of you. Oh! Never mind I actually agree with all of you.

*September 24, 2012*

**science**

suspension could be oil on water and a solution could be vinegar

*September 24, 2012*

**dyanmics PLEASE HELP!!!**

This deals with a cam follower. The slotted bar rotates with constant angular velocity, theta=12 rad/s. The follower 'A' follows the circular cam as the bar rotates. The arm is pinned at a distance h=0.2m to the left of the cam's center. The radius of the cam is rc...

*September 23, 2012*

**dyanmics PLEASE HELP!!!**

LOLOLOLOL

*September 23, 2012*

**dyanmics PLEASE HELP!!!**

A carpenter asks his helper to toss an apple to him. The carpenter is 12 ft up and 12 ft to the right of the helper, who throws the apple at Vo=32 ft/s. There are two values of theta that cause that apple to land in the carpenters hand. What are they?

*September 23, 2012*

**dynamics**

A carpenter asks his helper to toss an apple to him. The carpenter is 12 ft up and 12 ft to the right of the helper, who throws the apple at Vo=32 ft/s. There are two values of theta that cause that apple to land in the carpenters hand. What are they?

*September 23, 2012*

**dynamics**

PLEASE HELP!

*September 23, 2012*

**dynamics**

This deals with a cam follower. The slotted bar rotates with constant angular velocity, theta=12 rad/s. The follower 'A' follows the circular cam as the bar rotates. The arm is pinned at a distance h=0.2m to the left of the cam's center. The radius of the cam is rc...

*September 23, 2012*

**US history**

The sedation Act allowed the national government to jail people for

*September 22, 2012*

**Chem**

There are two stable isotopes of Gallium Their masses are 68.92558 and 70.9247050 AMU. If the average atomic mass of gallium is 69.7231, what is the natural abundance of the lighter isotope? I don't know where to start!

*September 20, 2012*

**Chemistry**

AHH they are rounding! I feel silly.

*September 20, 2012*

**Chemistry**

I meant HANDS ---> INCHES --> CM

*September 20, 2012*

**Chemistry**

This is meant to be simple, but for some reason I'm not getting the right answer. Question is: Perhaps the most famous horse race ever in the United States was the 1938 race between two thoroughbreds, War Admiral and Seabiscuit, both of whom stood about 15 hands high. ...

*September 20, 2012*

**arrays**

I think it's 0

*September 20, 2012*

**General Chemistry (Chem101)**

A chemist mixes two liquids A and B to form a homogeneous mixture. The densities of the liquids are 2.0514 g/mL for A and 2.6678 g/mL for B. When she drops a small object into the mixture, she finds that the object becomes suspended in the liquid; that is, it neither sinks nor...

*September 20, 2012*

**Physics**

A bullet of 10g enters a target at 100 ms-1 and leaves it 0.01 s later. Calculate: i. The rate of change of momentum of the bullet ii. The resistance offered by the target iii. The loss of kinetic energy of the bullet iv. The deceleration of the bullet v. The distance ...

*September 19, 2012*

**algebra 2**

solve for x: (exact answers) 5^(2x+1)-26(5^x)+5=0

*September 19, 2012*

**algebra 2**

list all solutions if x^(4)+x^(3)-11x^(2)+9x+20=0 and if one of the roots is x=2-i

*September 19, 2012*

**geometry**

if the length of each edge in a cube is increased by the same percent and the result was a cube that had 25% more volume than it originally had, by what percentage were the edges increased

*September 19, 2012*

**Physics**

A bullet of 10g enters a target at 100 ms-1 and leaves it 0.01 s later. Calculate: i. The rate of change of momentum of the bullet ii. The resistance offered by the target iii. The loss of kinetic energy of the bullet iv. The deceleration of the bullet v. The distance ...

*September 19, 2012*

**geometry**

EARTH COMPLETES ONE FULL ROTATION EACH DAY MAKING THE SUN APPEAR TO RISE AND SET. IF THE SUN PASSES DIRECTLY OVER HEAD, BY HOW MANY DEGREES DOES ITS POSITION IN THE SKY CHANGE EVERY HOUR?

*September 19, 2012*

**english **

Which sentence BEST combines the ideas shown below? (I put an arrow on the one I think the answer is) --->A.The football player did not seem seriously injured. As a precaution, the trainers moved him carefully. B.The football player did not seem seriously injured, and as a...

*September 18, 2012*

**Algebra**

4/3x -1

*September 18, 2012*

**Algebra**

Find an equation for the line satisfying the given conditions.Through (3, 3) and parallel to 4x - 3y = 6. y=?

*September 18, 2012*

**11th grade maths**

How do you fiind the averege rate change

*September 17, 2012*

**pre - algebra**

maria had $123 she spent $35,loaned $20 to a friend and received her $90 paycheck how much does she have now? so you would do 123 -20=103 and then 103 - 20=83 and 83 + 90 =wich is 173 so that would be the answer right?

*September 16, 2012*

**pre-algebra**

and then like um my next question is maria had $123 she spent $35,loaned $20 to a friend and received her $90 paycheck how much does she have now? so you would do 123 -20=103 and then 103 - 20=83 and 83 + 90 =wich is 173 so that would be the answer right?

*September 16, 2012*

**pre-algebra**

so the 15 - 9=4 okay thanks ms. sue for helping me with my 7th grade pre algebra hw I will probably need more help I will jut post my other questions too.

*September 16, 2012*

**pre-algebra**

A football team gained 4 yd, lost 2 yd, gained 11yd, lost 8 yd, and then lost 9 yd. Find the net gain or loss.

*September 16, 2012*

**physics**

A bicycle has a speed of 7.5m/s at 4.3sec and a constant acceleration of 2.6m/s^2. the bicycle is at the origin (on the positive x-axis) when 1.2sec. How far from the origin is the bike at 7sec? Answer in units of m

*September 16, 2012*

**physics**

A bicycle has a speed of 7.5m/s at 4.3sec and a constant acceleration of 2.6m/s^2. the bicycle is at the origin (on the positive x-axis) when 1.2sec. How far from the origin is the bike at 7sec? Answer in units of m

*September 16, 2012*

**Physics**

In deep space (no gravity), the bolt (arrow) of a crossbow accelerates at 187m/s^2 and attains a speed of 114m/s when it leaves the bow. For how long is it accelerated? Answer in units of m/s What speed will the bolt have attained 2.8 sec after leaving the crossbow? Answer in ...

*September 16, 2012*

**physics**

A body moving with uniform acceleration has a velocity of 11.1cm/s when it's coordinate is 3.59cm. If it's x coordinate 2.48sec later is -3.58cm, what is the x-component of it's acceleration. Answer in units of cm/s^2

*September 16, 2012*

**Algebra 2**

How many 2 liter mountain dew bottles would it take to fill up the earth if the radius is 6378.1?

*September 15, 2012*

**Physics**

A partly-full paint can has 0.83 U.S. gallons of paint left in it. (a) What is the volume of the paint, in cubic meters? (b) If all the remaining paint is used to coat a wall evenly (wall area = 12 m2), how thick is the layer of wet paint? Give your answer in meters.

*September 14, 2012*

**science**

the ph of a 0.280m solution of a weak base. B has been measured ph --8.69. using this information. calculate the base ionisationconstant kbof b

*September 14, 2012*

**math**

Find all the values of x in the interval [0,2π] that satisfy the equation: 8sin(2x)=8cos(x)

*September 13, 2012*

**7th Grade Science**

Autotrophic, Multicellular, Eukaryote, Vascular/Non-Vascular, Cell Wall, Photosynthesis, and Needs Water To Survive.

*September 13, 2012*

**Algebra II**

9x+y is less than or equal to 1700 9x+3y is less than or equal to 1800 4x+8y is less than or equal to 2400 ***I need help plugging in numbers for x and y. The numbers don't have to be the same for each question.

*September 13, 2012*

**Math**

Solve for t using natural logarithms. 7e^3t = 10e^2t

*September 11, 2012*

**Math**

The quantity demanded each month of Russo Expresso Makers is 250 when the unit price is $136.oo. The quantity demanded each month is 1,2oo when the unit price is $98.00. The suppliers will market 700 espresso makers if the unit price is $58.00 or lower. At a unit price of $74....

*September 11, 2012*

**Physics**

A ping pong ball is rolling across a table at 22 cm/s. When the ball is 78 m away from the edge your little brother starts to blow on it. If the little doofus hopes to prevent the ball from falling off the edge, what minimum acceleration must be achieved?

*September 10, 2012*

**xx**

explain problem: 3.1 - 2.076=

*September 10, 2012*

**Finite, Math, Probability**

Assume that there are 17 board members: 9 females, and 8 males including Carl. There are 4 tasks to be assigned. What is the probability that at least one female and Carl are assigned tasks?

*September 10, 2012*

**Chemistry**

Help with any of these: 21. Aluminium sulphate is often used by gardeners to acidify soil and can be produced by the reaction 2Al(OH)3(aq) + 3 H2SO4(aq) à Al2(SO4)3(aq) + 6 H2O(l) The volume of 0.275 mol/L H2SO4(aq) needed to react completely with 112...

*September 9, 2012*

**Physics**

An attacker at the base of a castle wall 3.82 m high throws a rock straight up with speed 7.10 m/s from a height of 1.45 m above the ground. (a) Will the rock reach the top of the wall? __yes __no (b) If so, what is its speed at the top? If not, what initial speed must it have...

*September 8, 2012*

**Help On Math**

Thanks

*September 8, 2012*

**Help On Math**

A movie theater has fixed costs of $5,500 per day and variable costs averaging $2 per customer. The theater charges $7 per ticket. How many customers per day does the theater need in order to make a profit? Give the smallest possible value. The theater makes a profit when it ...

*September 8, 2012*

**phys**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.30 m/s. The car is a distance d away. The bear is 32.9 m behind the tourist and running at 4.92 m/s. The tourist reaches the car safely. What is the maximum possible value for d?

*September 6, 2012*

**phys**

A pellet gun is fired straight downward from the edge of a cliff that is 28.5 m above the ground. The pellet strikes the ground with a speed of 26.1 m/s. How far above the cliff edge would the pellet have gone had the gun been fired straight upward?

*September 6, 2012*

**phys**

A woman on a bridge 84.7 m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 8.02 m more to travel before passing under the bridge. The stone hits the water 4.86 ...

*September 6, 2012*