Monday

February 20, 2017
Total # Posts: 1,141

**Physics please help!!**

A 73.5 kg person sits on a 3.20 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.74 cm in diameter. Calculate the pressure exerted on the floor by each leg of the chair, assuming the weight is evenly distributed.

*March 15, 2011*

**Physics please help!!**

The mass of a star is 1.49·1031 kg and it performs one rotation in 26.1 days. Find its new period (in /days) if the diameter suddenly shrinks to 0.59 times its present size. Assume a uniform mass distribution before and after.

*March 14, 2011*

**Stats**

if 5% of all calculators are defective, find the mean, variance, and standard deviation of a lot of 400 calculators. round your final answer to two decimal places if necessary.

*March 13, 2011*

**Physics please help!!**

A 1.94 kg solid sphere (radius = 0.105 m) is released from rest at the top of a ramp and allowed to roll without slipping. The ramp is 0.710 m high and 5.17 m long. When the sphere reaches the bottom of the ramp, what is its total kinetic energy?

*March 13, 2011*

**Physics**

After you pick up a spare, your bowling ball rolls without slipping back toward the ball rack with a linear speed of v = 3.41 m/s To reach the rack, the ball rolls up a ramp that rises through a vertical distance of h = 0.529 m. What is the linear speed of the ball when it ...

*March 13, 2011*

**Physics please help!!**

A 12.1 g CD with a radius of 6.16 cm rotates with an angular speed of 31.1 rad/s. What is its kinetic energy?

*March 13, 2011*

**Physics please help!!**

A 12.1 g CD with a radius of 6.16 cm rotates with an angular speed of 31.1 rad/s. What is its kinetic energy?

*March 10, 2011*

**Physics please help!!**

A 12.1 g CD with a radius of 6.16 cm rotates with an angular speed of 31.1 rad/s. What is its kinetic energy?

*March 10, 2011*

**Physics please help!!**

How much work must be done to accelerate a baton from rest to an angular speed of 7.27 rad/s about its center? Consider the baton to be a uniform rod of length 0.529 m and mass 0.478 kg

*March 10, 2011*

**Math**

Converting 60 percent into A fraction in simplest form

*March 7, 2011*

**Physics**

I'm still confused on how the find the center of the student's mass though????

*March 4, 2011*

**Physics**

To determine the location of his center of mass, a physics student lies on a lightweight plank supported by two scales L = 2.40 m apart If the left scale reads 278 N, and the right scale reads 116 N, calculate the student's mass. Calculate the distance from the student'...

*March 4, 2011*

**Physics please help!!**

A school yard teeter totter with a total length of 5.46 m and a mass of 35.9 kg is pivoted at its center. A 17.7 kg child sits on one end of the teeter totter. Where should a parent push with a force of 272 N in order to hold the teeter totter level?

*March 4, 2011*

**geometry**

bisects and is perpendicular to line segments and . = 96 inches, and line segment = 52 inches. What is the length of ?

*March 3, 2011*

**PHYSICS tension & angle**

A van accelerates down a hill (Fig. P4.71), going from rest to 30.0 m/s in 6.70 s. During the acceleration, a toy (m = 0.250 kg) hangs by a string from the van's ceiling. The acceleration is such that the string remains perpendicular to the ceiling. Find theta Find tension...

*March 3, 2011*

**physics**

Two blocks, A and B (with mass 50 kg and 100 kg, respectively), are connected by a string, as shown in Figure P5.64. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is µk = 0.25. Determine the change ...

*March 3, 2011*

**Statistics**

A random variable X is normally distributed with ì = 60. Convert the value of X to a z-score, if the standard deviation is as given. X = 60; ó = 7 A) 7 B) 1 C) 60/70 D) 0

*March 2, 2011*

**Statistics**

A random variable X is normally distributed with ì = 60. Convert the value of X to a z-score, if the standard deviation is as given. X = 60; ó = 7 A) 7 B) 1 C) 60/70 D) 0

*March 2, 2011*

**Math**

Suppose that y≤3x, 2x≤y and 1/3x+1/3y≤1 together with 0≤x, 0≤y. Determine a value of k so that the function f(x,y)=kx+y has a positive maximum value on the region at two corners. ANS: k= ?

*March 2, 2011*

**Math**

Suppose that y≤3x, 2x≤y and 13x+13y≤1 together with 0≤x, 0≤y. Determine a value of k so that the function f(x,y)=kx=y has a positive maximum value on the region at two corners. ANS: k= ?

*March 2, 2011*

**chemistry**

How many grams of oxygen are required to produce 56.0 g water vapor?

*March 2, 2011*

**math**

x/4-4=3x/4-6 plz show step by step

*March 1, 2011*

**math**

x/2-4=-5

*March 1, 2011*

**chemistry**

what is my percent yiel if i had 1.46 grams of copper to start with and ended with 2. 47 grams of copper?

*March 1, 2011*

**Statistics**

The probability that a house in an urban area will develop a leak is 5%. If 82 houses are randomly selected, what is the probability that none of the houses will develop a leak? A) 0.050 B) 0.001 C) 0.000 D) 0.015

*March 1, 2011*

**Physics please help!!**

A 60cm diameter bike wheel starts at rest and develops an angular speed of 12.0 rad/s in 10 seconds. What linear distance does the bike travel?

*February 22, 2011*

**science**

its not my work its something i simply don't understand at all and what the like questions are exactly asking?

*February 18, 2011*

**science**

Imagine that you are riding a bus. A girl gets on, and you recognize her as someone you know but have not seen for two years. 1. What are the roles of the central nervous system and the peripheral nervous system in allowing you to recognize the person and remember who she is? ...

*February 18, 2011*

**Math**

Three(cylindrical) steel drums are put together and a steel band is wrapped tightly around the three drums. If the radius of each drum is 2 feet, what is the length of the steel band? (The view of the drums below is from the top, or end of the drums.) The three drums are in a ...

*February 17, 2011*

**Physics**

The wheel has a radius of 4.89m

*February 16, 2011*

**Physics**

How far does a point on the circumference travel if the wheel is rotated through an angle of 28.6 rads?

*February 16, 2011*

**pre-calc**

(3^-2+4^-2)^-1/2

*February 16, 2011*

**pre-calc**

(3^-2+4^-2)^-1/2

*February 16, 2011*

**Physics**

How many calories of heat will a person lose by evaporating 1250g of water and perspiration in a day?

*February 16, 2011*

**Are their any Physics tutors on here tonight?!**

A cart of mass M1 = 6.00 kg and initial speed = 4.00 m/s collides head on with a second cart of mass M2 = 4.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision.

*February 15, 2011*

**Are any tutors helping with Physics tonight? Help!**

A cart of mass M1 = 6.00 kg and initial speed = 4.00 m/s collides head on with a second cart of mass M2 = 4.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision.

*February 15, 2011*

**Science**

Does the question give you an example or information of what you need to make the genotype of?

*February 15, 2011*

**math**

you have a set of flashcards 1-36. a card is chosen at random. find the odds in favor of and against each selection. 1. multiple of 3 2. prime # 3. mutliple of 2 or 3 4. mutliple of 2 and 3 5. only 1 digit 6. has more than 1 digit

*February 15, 2011*

**math**

you have a set of flashcards 1-36. a card is chosen at random. find the odds in favor of and against each selection. 1. multiple of 3 2. prime # 3. mutliple of 2 or 3 4. mutliple of 2 and 3 5. only 1 digit 6. has more than 1 digit

*February 15, 2011*

**english**

Read the faculty’s rubric comments and the Turnitin® report provided in Appendix D. Write one paragraph of at least 200-words explaining what the student could have done differently to avoid the plagiarism concerns raised by the faculty member. How could the use of ...

*February 15, 2011*

**Physics please help!!**

High speed stroboscopic photographs show that the head of a 188 g golf club is traveling at 52.5 m/s just before it strikes a 45.5g golf ball at rest on a tee. After the collision, the club head travels (in the same direction) at 44.0 m/s. Find the speed of the golf ball just ...

*February 14, 2011*

**consumer economics**

I"m not sure it doesn't say if it's annual.

*February 14, 2011*

**consumer economics**

Phonecia deposits $300 into a simple interest account that pays 3%. After 7 months what will be the total value of her account? A.$309.00 B. 305.25 C. $321.00 D. $9.00

*February 14, 2011*

**math 8th please help**

i thought that was probability...... sorry i must have messed up big time on my homework then

*February 14, 2011*

**math 8th please help**

a teaher chooses a student at random from a class of 10 boys and 15 girls. Find the odds favor of and for the odds against each event. 1. choosing a girl 2. choosing a boy i don't understand what the odds of something would be

*February 14, 2011*

**math**

a teaher chooses a student at random from a class of 10 boys and 15 girls. Find the odds favor of and for the odds against each event. 1. choosing a girl 2. choosing a boy i don't understand odds of something please help.........

*February 14, 2011*

**Physics please help!!**

A 86.0 kg diver falls from rest into a swimming pool from a height of 6.30 m. It takes 1.86 s for the diver to stop after entering the water. Find the magnitude of the average force exerted on the diver during that time.

*February 11, 2011*

**Physics please help!!**

A 30.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 18.00 m. When she is partway down the slide, at a height h2 of 9.00 m, she is moving at a speed of 9.30 m/s. Calculate the mechanical energy lost due to friction (as heat, etc.).

*February 11, 2011*

**math (8th grade)**

thank-you 4 the help

*February 10, 2011*

**math (8th grade)**

The length of each piece in a model train railroad built on the HO scale is 1/87 of the actual length. Another popular model is the N scale, for which the scale is 1/160. Each car on a full-size passenger train is 80ft long. What is the length in inches of a model passenger ...

*February 10, 2011*

**math**

If the O scale (model train question) is 1/48 the acutal length. An O-scale locomotive is 1.05ft long. How long is the actual locomotive?

*February 10, 2011*

**Modern World Studies**

Okay thanks!

*February 10, 2011*

**Modern World Studies**

Okay thank you!

*February 10, 2011*

**Modern World Studies**

Can someone please hurry and help me? I don't really understand this lesson. & I am taking a test on it.

*February 10, 2011*

**Modern World Studies**

1. What do we call the movement in literature and the arts that emphasized nature and emotion over reason? [x] a. Enlightenment b. Reformation c. Romanticism d. Neoclassicism 2. Who said it is the government’s job to protect the natural rights of life, liberty, and ...

*February 10, 2011*

**Physics**

A block of mass 2.10 kg is pushed 2.33 m along a frictionless horizontal table by a constant 19.4 N force directed 27.5o below the horizontal. Determine the magnitude of the normal force exerted by the table.

*February 7, 2011*

**Physics**

A block of mass 2.10 kg is pushed 2.33 m along a frictionless horizontal table by a constant 19.4 N force directed 27.5o below the horizontal. Determine the magnitude of the normal force exerted by the table.

*February 7, 2011*

**Physics**

A block of mass 2.10 kg is pushed 2.33 m along a frictionless horizontal table by a constant 19.4 N force directed 27.5o below the horizontal. Determine the magnitude of the normal force exerted by the table.

*February 7, 2011*

**Physics please help!!**

If a woman lifts a 19.3 kg bucket from a well and does 6.10 kJ of work, how deep is the well? Assume that the speed of the bucket remains constant as it is lifted

*February 7, 2011*

**Art**

How does the medium influence the way we perceive the art, and the value we may give to a particular piece?

*February 4, 2011*

**chemistry**

arrange these seven substances in order from highest melting point to lowest melting point. H2O, MgO, CCl4, CH2Cl2, CaCl2, N2, PF3

*February 3, 2011*

**intermolecular forces**

arrange these seven substances in order from highest melting point to lowest melting point. H2O, MgO, CCl4, CH2Cl2, CaCl2, N2, PF3

*February 3, 2011*

**Physics**

A helicopter is ascending vertically with a speed of 4.50 m/s. At a height of 65 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: The package's initial speed equals the helicopter's.]

*February 1, 2011*

**Physics please help!!**

A car starts from rest and travels for 5 seconds with a uniform acceleration of 2m/sec^2. The driver then applies the breaks causing a deceleration of 1.5m/sec^2. If the breaks are applied for 4 second, how fast is the car going after the breaking period?

*January 31, 2011*

**Physics**

A horse canters away from its trainer in a straight line, moving 160 m away in 12.0 s. It then turns abruptly and gallops halfway back in 4.5 s. (a) Calculate its average speed.m/s (b) Calculate its average velocity for the entire trip, using "away from the trainer" ...

*January 30, 2011*

**Physics please help!!**

A mass M is initially at rest on a horizontal surface, μs=0.30 and μk=0.20 . A horizontal string then pulls M with a tension T. Forces below are magnitudes. Indicate if each statement is correct or incorrect If M does not accelerate, then T ≤ μsN M will ...

*January 30, 2011*

**Physics please help!!**

Those answers are coming up as wrong too. This problem is really frustrating me. I don't know what else to do.

*January 30, 2011*

**Physics please help!!**

I have already and the answers I submit is wrong. If M does not accelerate, then T ≤ μsN I M will accelerate if T exceed μsN I The NET force on M (if M does not move) is T C N equals Mg C T equals μsN if M remains at rest C M will accelerate if T exceeds...

*January 30, 2011*

**Physics please help!!**

A mass M is initially at rest on a horizontal surface, μs=0.30 and μk=0.20 . A horizontal string then pulls M with a tension T. Forces below are magnitudes. Indicate if each statement is correct or incorrect If M does not accelerate, then T ≤ μsN M will ...

*January 30, 2011*

**Word within the word list 9**

what are the answers to vulpine:porcine:: clever:gluttonous fox:grapes telegraph:photograph ignominious:glorious Please respond asap thanks!

*January 30, 2011*

**English**

Thank you, I made an 88.2 :)

*January 28, 2011*

**English**

I forgot to put the answers that I thought, but there they are :)

*January 28, 2011*

**English**

Sorry, C A C D A C A D A C A A C C D D C

*January 28, 2011*

**English**

Works such as "To Build a Fire" gave Naturalist writers such as Jack London a platform to argue that (Points : 5) human wisdom ingenuity can solve all problems. life in the woods is fun and easy. natural forces are powerful and unpredictable and deserve respect. the...

*January 28, 2011*

**Physics**

M2 is supposed to be hanging down from the pulley

*January 27, 2011*

**Physics**

Two blocks are arranged as shown. The pulley can be considered to be massless, and friction is negligible. M1 is four times more massive than M2. M1--->0(Pulley) V V (down direction) V M2 If the system is released from rest, how far will M1 travel in 0.523 s?

*January 27, 2011*

**Physics please help!!**

Oh gosh, can't believe I misread that. Thank you.

*January 27, 2011*

**Physics please help!!**

How do I find the time? How is 90.0 m/s converted to seconds? Isn't that what I need to plug into the quation?

*January 27, 2011*

**Physics please help!!**

A man with mass m =96.4 kg (weight = 212.1 lbs is walking towards a patio at 2.00 m/s (4.47 mph) when, at the last moment, he realizes the sliding glass door is closed. He puts out his hand suddenly to stop himself, and comes to a halt in 90.0ms. Find the magnitude of the ...

*January 27, 2011*

**Physics**

A man with mass m =96.4 kg (weight = 212.1 lbs is walking towards a patio at 2.00 m/s (4.47 mph) when, at the last moment, he realizes the sliding glass door is closed. He puts out his hand suddenly to stop himself, and comes to a halt in 90.0ms. Find the magnitude of the ...

*January 26, 2011*

**Physics**

A 43.3 kg boy and a 60.0 kg girl are on the surface of a frozen lake, 10.5 m apart. Using a rope, the boy exerts a horizontal 5.90 N force on the girl, pulling her toward him. Calculate the magnitude of the boy's acceleration.

*January 25, 2011*

**Physics please help!!**

A 43.3 kg boy and a 60.0 kg girl are on the surface of a frozen lake, 10.5 m apart. Using a rope, the boy exerts a horizontal 5.90 N force on the girl, pulling her toward him. Calculate the magnitude of the boy's acceleration.

*January 25, 2011*

**Physics**

One of the fastest recorded pitches major-league baseball, thrown by Nolan Ryan in 1974, was clocked at 100.8 mi/hr. If a pitch were thrown horizontally with this velocity, how far would the ball fall vertically by the time it reached home plate 60.0 ft away?

*January 23, 2011*

**Physics please help!!**

A quarterback takes the ball from the line of scrimmage, runs backward for 11.1 yds, then runs sideways parallel to the line of scrimmage for 17.8 yds. At this point, he throws a 52.7 yd forward pass straight downfield, perpendicular to the line of scrimmage. What is the ...

*January 23, 2011*

**science**

how many different elements are bonded to carbon in the molecule of luminol?

*January 23, 2011*

**Science**

They are in the same group of 16. oxygen has 6 valence electrons selenium has also has 6

*January 23, 2011*

**Help! Physics!**

A person walks 23o north of east for 4.8 km. How far would a person walk due north and due east to arrive at the same location.

*January 23, 2011*

**Physics please help!!**

A peregrine falcon dives at a pigeon. The falcon starts downward from rest and falls with free-fall acceleration. If the pigeon is 82.8 m below the initial position of the falcon, how long does it take the falcon to reach the pigeon? Assume that the pigeon remains at rest.

*January 23, 2011*

**Physics**

A peregrine falcon dives at a pigeon. The falcon starts downward from rest and falls with free-fall acceleration. If the pigeon is 82.8 m below the initial position of the falcon, how long does it take the falcon to reach the pigeon? Assume that the pigeon remains at rest.

*January 23, 2011*

**Physics**

A ball is thrown directly downward, with an initial speed of 6.10 m/s, from a height of 31.0 m. After what interval does the ball strike the ground?

*January 23, 2011*

**Physics**

A ball is thrown directly downward, with an initial speed of 6.10 m/s, from a height of 31.0 m. After what interval does the ball strike the ground?

*January 23, 2011*

**Physics**

A ball is thrown vertically upwards with an initial velocity of 27.0 m/s. Neglecting air resistance, how long is the ball in the air?

*January 23, 2011*

**Physics**

A ball is thrown vertically upwards with an initial velocity of 27.0 m/s. Neglecting air resistance, how long is the ball in the air?

*January 23, 2011*

**physics**

A trapeze artist, starting from rest, swings downward on the bar, lets go at the bottom of the swing, and falls freely to the net. An assistant, standing on the same platform as the trapeze artist, jumps from rest straight downward. Friction and air resistance are negligible...

*January 19, 2011*

**Chemistry**

a. 12

*January 19, 2011*

**math**

Use the digits 0,2,4,5,6 and 8 to write two money amounts that you can subtract by trading 1 dime for 10 pennies. Then solve.

*January 18, 2011*

**physics**

A 3.20 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0° with the horizontal. The block accelerates to the right at 7.50 m/s2. Determine the coefficient of kinetic friction between block and ceiling. Would ...

*January 18, 2011*

**Physics**

The speed of a vehicle is 3.56 meters per second. Select from the list below all of the answers which express that speed and which are formatted so that CAPA can judge the answer [* means multiply, ^ means raise to a power, / means divide]. (Entering the NUMERICAL VALUE and ...

*January 11, 2011*

**Physics**

Calculate the volume of a spherical balloon which has a surface area of 0.0793 m2

*January 11, 2011*

**Civics and Economics**

what is the purpose of a fillibuster

*January 10, 2011*