Monday

May 25, 2015

May 25, 2015

Total # Posts: 341

**Physics Class**

A crowbar is used to wrench open a wooden crate. The crowbar is situated so that a point 8 cm from the end digging into the box acts as a pivot point. The crobar is gripped on the other side, 29 cm away from the pivot. If the person exerts a force of 110 lbs on the crobar, how...
*April 28, 2011*

**Physics Class**

A 965 kg car is driving along a boardwalk. The car's center of mass is 45 cm in front of the rear wheels, and the distance between the front and rear wheels is 2 m. What total force does the car's front tires exert on the boardwalk? Give your answer in Newtons.
*April 28, 2011*

**Physics Class**

The equation describing the motion of an object is y=0.8cos(4.2t+0.32). What is its period?
*April 28, 2011*

**Physics Class**

A 166 g mass is attached to a horizontally mounted spring. It is pulled out to stretch the spring and then released. You determine the period of the oscilliation to be 1.0 seconds. What is the acceleration of the mass (magnitude) when the spring is stretched 33 cm during the ...
*April 27, 2011*

**Physics/Math**

The equation describing the motion of an object is y=0.8cos(4.2t+0.32). What is its period? I don't know how to figure this out?
*April 27, 2011*

**Physics**

A 166 g mass is attached to a horizontally mounted spring. It is pulled out to stretch the spring and then released. You determine the period of the oscilliation to be 1.0 seconds. What is the acceleration of the mass (magnitude) when the spring is stretched 33 cm during the ...
*April 26, 2011*

**physics**

A 65 g meter stick has two masses, each 250 g placed upon it. The first is located at 72 cm and the second located at 41 cm. Where should you place your finger if you wished to balance the meter stick? Give your answer in cm.
*April 25, 2011*

**Physics**

A 984 kg car is driving along a boardwalk. The car's center of mass is 33 cm in front of the rear wheels, and the distance between the front and rear wheels is 2 m. What total force does the car's front tires exert on the boardwalk? Give your answer in Newtons.
*April 24, 2011*

**Biology**

I believe that I have answered the following questions correctly, but would like some reassurance. organisms that are used to decontaminate soils may a. store contaminates in their tissues b. release pollutants into the air c. degrade the pollutants d. be plants or ...
*April 22, 2011*

**Calc 2**

Aha I got it! Thanks so much! :)
*April 18, 2011*

**Calc 2**

Mggraph: but (r*cos(theta))^2 is not x^2, is it? I thought rcos(theta) = x^2 This is what I got: 1 = 5y/[(x^2)(square root of(x^2 + y^2))]
*April 18, 2011*

**Calc 2**

I am sorry, it is r = 5tan(theta)sec(theta)
*April 18, 2011*

**Calc 2**

Find a Cartesian equation for the polar curve y = 5tan(theta)sec(theta). I think I got it but I just wanted to double check. Thanks in advance!
*April 18, 2011*

**Physics**

You are riding a bicycle at a speed of 15 m/s. The bycicle has tires with diameters measuring 630 mm. You can approximate each tire as a solid cyllinder (to calculate inertia) with a mass of 0.5 kg. What is the total rotational kinetic energy of the bicycle?
*April 8, 2011*

**Physics**

i sill don't get it?
*April 8, 2011*

**Physics**

When throwing a ball, a pitcher exerts a torque of 150 N m for 0.15 seconds onto their arm before letting go of the ball. With an arm length of 0.9 m with inertia 0.6 kg m2, what is the speed of the ball just after it is released?
*April 8, 2011*

**PHysics**

The tip of a helicoptor rotor blade can reach speeds of roughly 300 mph (130 m/s). It takes about 30 seconds to get them up to speed and they have a typical radius of 20 feet (6 m). What is the average angular acceleration of the rotor blades as they get up to speed?
*April 6, 2011*

**Math**

29 tapes
*March 30, 2011*

**Math**

When you join Sally's Video Club, there is no rental charge for the first 2 tapes. Each tape then costs $2 to rent, but you can borrow one tape free as a bonus after renting 10 tapes. How many tapes would you be able to rent for $50?
*March 30, 2011*

**math**

What are 10 numbers that have a median of 21, a range of 20, and a mode of 10?
*March 24, 2011*

**Physics**

Two objects are mocing about so that their total momentum is zero. What can be said about their kinetic energy? Choose the most descriptive answer. a. the kinetic energy must be greater than zero b. the kinetic energy must be negative c. the kinetic energy must be equal to or ...
*March 21, 2011*

**Physics**

You are trying to package a 50g egg so that it won't break after you drop it from a height of 10 meters. You decide to use wood as a nice soft packaging to protect the egg. When the egg hits the ground, the wood "softens" the landing so that it takes 5 ...
*March 21, 2011*

**Physics**

Two objects are moving about so that their total momentum is zero. What can be said about their kinetic energy?
*March 21, 2011*

**Physics**

The game is called Ice Bocci. You play by sliding pucks across the ice into each other, sort of like marbles. One player slides the red puck straight into a stationary green puck. The red puck is sliding with a speed of 4 m/s and weighs twice as much as the green puck. What ...
*March 20, 2011*

**Physics**

You design a roller coaster that has an initial drop from some height "h" followed by a loop and then the ride comes to a stop. If the loop of a circle with a diameter of 50 m, what is the minimum height you would need to make sure nobody falls out? (Ignore friction)
*March 4, 2011*

**Algebra 2 word problem**

just checking to see if i have this problem correct Sammy can cut wood twice as fast as Joe. When they both work together, it takes them 4 hrs. how long would it take them to do the job alone? 4/x +4/x+2 = x^2+2 4x+4x+8= x^2+2 8x+8= x^2+2 x^2-6x-8=0 (x-4)(x+2) x=4 x=-2 since i...
*March 2, 2011*

**checking to see if this is right**

just checking to see if i have this problem correct Sammy can cut wood twice as fast as Joe. When they both work together, it takes them 4 hrs. how long would it take them to do the job alone? 4/x +4/x+2 = x^2+2 4x+4x+8= x^2+2 8x+8= x^2+2 x^2-6x-8=0 (x-4)(x+2) x=4 x=-2 since i...
*March 2, 2011*

**Algebra 2 word problem**

Just wanted to check to see if these are correct. Thank you, Please check if a greyhound bus travels 7mph slower than the express bus. the express bus travels 45 miles in the time it takes the greyhound bus to travel 38 miles. find the speed of each bus greyhound 38/x-7 ...
*March 2, 2011*

**biology**

what forms between the other two primary tissue layers
*March 1, 2011*

**Algebra 2**

Just checking to see if I got this right. Thanks, (3x^4--8x^2 -3x-3) / (x^2-3) 3x^2+1 remainder -3x
*March 1, 2011*

**Organic Chemistry**

what is the major product if 2,3,3-trimethylpentane was mixed with IBr?
*March 1, 2011*

**Algebra 2**

Just checking to see if I got this right. Thanks, (3x^4--8x^2 -3x-3) / (x^2-3) 3x^2+1 remainder -3x
*March 1, 2011*

**Algebra 2**

I am totally lost! (3x^4--8x^2 -3x-3) / (x^2-3)
*March 1, 2011*

**Algebra 2**

I have been trying to figure this problem out and I am completely lost. Could someone help guide me through it? (3x^4-0x^3-8x^2 -3x-3) / (x^2-3)
*February 28, 2011*

**Physics**

Which of the following is true? a. Conserved forces cannot do work b. Work can be performed on an object without moving it c. If the work is done by a conserved force, you do not need to know the path the object took d. To know the total work performed on an object you must ...
*February 26, 2011*

**Physics**

Suppose the Earth was only half the size it is now (half the mass and half the radius), what would "g" be?
*February 24, 2011*

**Physics**

The gravitational constant for Earth is gE = 9.8m/s2. The gravitational constant for the planet Mongo is 20 m/s2. If an object has a weight of 10 lbs on earth, what is its weight on Mongo?
*February 21, 2011*

**Physics**

The gravitational constant for Earth is gE = 9.8m/s2. The gravitational constant for the planet Mongo is 20 m/s2. If an object has a mass of 10 kg on earth, what is its mass on Mongo?
*February 21, 2011*

**Physics**

The gravitational force between two objects is proportional to what
*February 21, 2011*

**Physics**

A 5 kg block is being pulled to the right by a rope which is attached to a dangling 2 kg mass. The coefficient of kinetic friction between the mass & table is 0.1 What is the tension in the rope?
*February 21, 2011*

**Physics**

A block is sitting on a ramp. The block feels a force of friction sufficient to keep it from sliding down the ramp, which makes an angle of 30 degrees w.r.t. horizontal. What is the minimum coefficient of static friction between the block & ramp?
*February 21, 2011*

**Physics**

Three weights are attached to the corners of an equilateral triangle (side length 10 cm) made from stiff but very light wire. Measured from the bottom left corner, what is the center of mass of this object if M1 = 0.1 kg, M2 = 0.2 kg, and M3 = 0.3 kg?
*February 21, 2011*

**Physics**

A car travels around a circular track (4 km diameter). Its tires have frictional coefficients: mS = 0.3 & mK = 0.2. If the track is flat, how fast can the car travel around the track and still maintain control?
*February 21, 2011*

**Physics**

A lower block is being pulled to the right across a wooden table and it is 5kg and the block on top of it weighs 2 Kg. The friction between the table and the lower block is reduces the total acceleration to be 1.5 m/s2. Friction keeps the upper block attached to the lower one...
*February 21, 2011*

**Physics**

A 5 kg block is being pulled to the right with a 20 N force. This causes the block to slide along the table with an acceleration of 2 m/s2. What is the coefficient of kinetic friction between the block and table?
*February 21, 2011*

**Physics**

A 5 kg block is attached via a rope to a dangle 2kg mass. Consider the case without friction. What angle would the ramp be for the 5kg block to experience zero acceleration?
*February 21, 2011*

**Trig**

find the exact value of the expression using the provided information. Find Tan (S+T) given that cos s=1/3 with s in quad I and sin T= -1/2 with T in quad IV
*February 18, 2011*

**Trig**

tan 75 (show all work please)
*February 18, 2011*

**Trig**

No it is to find the exact value of the expression using the provided information. Find Tan (S+T) given that cos s=1/3 with s in quad I and sin T= -1/2 with T in quad IV
*February 18, 2011*

**Trig**

find (s+t) given that cos s=1/3 with s in quad I and sin T=-1/2 with t in quad IV
*February 18, 2011*

**chemistry**

25.5 degrees C
*February 13, 2011*

**Pre algebra**

-3(4x+3)+4(6X+1)=43 Need to solve
*January 23, 2011*

**algebra**

How do I find a the surface area of a can that has a diameter of 4 inches and a height of 3 inches?
*January 19, 2011*

**Math**

Solve. 3p-1=5(p-1)-2(7-2p)
*January 17, 2011*

**geometry**

triangle
*January 13, 2011*

**geometry**

If AC = 20 centimeters, and BC = 16 centimeters, what does AB equal?
*January 13, 2011*

**math analysis**

how do i do cosecant x= 30/150? and how do i do cosecant x= 1500/9000
*January 9, 2011*

**7th Grade**

z + 5/7 = 3 z = 3 - 5/7 z= 2&2/7
*January 9, 2011*

**science**

Trace fossil
*January 2, 2011*

**Math**

3 x 25=75 P 75 -- -- =62.5% 100 120 cross multiply. P x 120= 120P 100 x 75=7500 7500/120=62.5%
*December 31, 2010*

**Chemistry**

Identify an inert element that is used in electrical discharge tubes.
*December 8, 2010*

**English**

Choose the correct word to complete each sentence. 1. Despite wanting to pass the exam, Julia just couldn't get down to revising. She seemed to have a mental ___ about it. a. brick b. gap c. block d. space 2. When the counsellor listened to George's problems, her non-...
*December 7, 2010*

**Maths - Probability**

Tickets numbered 1 to 1000 were sold in a raffle for which there was one prize. Mr Kahn bought all the tickets containing at least one '3' because '3' was his lucky number. What was the probability of Mr Kahn winning?
*December 4, 2010*

**2nd grade**

what is the antonym of the word smooth
*November 28, 2010*

**College physics**

A toddler is on a playground swing. When she is right in the middle going forward (to the right), then ... a).her tangential acceleration is maximal to the right. b) her tangential acceleration is zero. c) her tangential acceleration is maximal to the left. d) her kinetic ...
*November 21, 2010*

**english**

Need ideas for a 7th grade research paper. I like gymnastics and dance. any ideas?
*November 3, 2010*

**accounting**

cash balance per books 6781.50
*October 25, 2010*

**Science**

What is the power of 1,000 newtons, 3 meters and 60 seconds?
*October 25, 2010*

**College Physics**

So would I divide the problem by wf?
*October 22, 2010*

**College Physics**

A freely rotating merry-go-round on a playground has a moment of inertia of 312 kgm2 and a radius of R=2.5 m. It is rotating with ω0=2.8 rad/s when a kid of mass 45 kg is standing on its outer rim. Neglecting friction, what is going to be the angular velocity of the merry...
*October 22, 2010*

**geometry**

Q is the midpoint of PR. PQ = 3x - 5 and QR = x + 17. What is the value of x?
*September 14, 2010*

**8th grade**

graph each realation on cordanant system
*August 30, 2010*

**physics**

10^14. Divide area of pinhead by area of atom
*August 26, 2010*

**Earth Space Science**

What type of motion would have to occur to move or displace the fixed color lines produced by a gas like helium or hydrogen toward the 400 nanometer mark on the spectrum scale?
*May 4, 2010*

**physics**

If you shout across a canyon and hear an echo 3.6 s later, how wide is the canyon?
*April 27, 2010*

**accounting**

This is not enough information. You need another number. Either the original price or a discounted price or something???
*April 25, 2010*

**fractions and decimals**

15/86 is the fraction then divide 15 by 86 and you get 0.1744 that would be one option for row one. I'm not sure if you can make improper fractions but if you can it could also be 86/15 as a fraction then divide 86 by 15 5.7333 repeater. I am assuming you could arrange the...
*April 25, 2010*

**physics**

if a super dense material with a refractive index of 1.76 x10^7 what is the speed of light in this material
*April 14, 2010*

**math**

Mathematically, why is a manhole cover round?
*March 21, 2010*

**world history**

Under whose reign did the Persian empire become the greatest military power of the ancient world?
*March 14, 2010*

**chemistry**

What is the formula used to solve the problem: How many milliliters of 1.171 M HCl are required to react with 7.69 grams of CaCO3 ?
*March 4, 2010*

**Algebra 2**

Y=2/3-1 y=-x+4
*February 2, 2010*

**algebra**

if u cut any size circle 5times , what is the greatest amount of pieces i can get?
*January 6, 2010*

**math**

hi, i am in forth grade i need to know what factors means. now for my home work. can you please respond and in a way i can under stand.
*October 29, 2009*

**3 grade**

what i dont get your question and your in 3rd grade and they ask you this
*October 29, 2009*

**Algebra II**

The answer for (7+5i)+(-4+2i) is 3+7i. But I got -38-6i. I combined -28 and 10i^2 to get -38, and I combined -20i and 14i to get -6il So all together this was -28+-6i+-10, which resulted in -38-6i. Could you please tell me where I went wrong?
*October 15, 2009*

**Chemistry**

What are the characteristics of a perfect flame for a bunsen burner??
*October 13, 2009*

**Biology**

What is the role of oxygen in aerobic respiration?
*October 12, 2009*

**AP World History**

How would you compare and contrast life in foraging societies with life in agricultural societies after the Agricultural Revolutions?
*August 4, 2009*

**health**

The answer is D. The person who creates the data in the record. It wouldn't be the patient
*April 18, 2009*

**biology**

why are the processes of transcription necessary for life?
*April 15, 2009*

**biology**

why are the processes of transcription necessary for life?
*April 15, 2009*

**4th grade**

what is prime and composite 13,37,25,117208,67
*January 30, 2009*

**Chemistry**

Calculate the volume of 0.6M HNO3 necessary to neutralize 28.55 cm3 of 0.45M KOH. please show work and detail.
*January 15, 2009*

**Chemistry**

What volume of 0.5M HNO3 is required to neutralize 25 cm3 of a 0.2M NaOH solution? please show work and detail.
*January 15, 2009*

**Chemistry-TITRATION**

A titration of 15.0 cm3 of household ammonia, NH3, required 38.57 cm3 of 0.78M HCl. Calculate the molarity of the ammonia. please show work and detail.
*January 15, 2009*

**Chemistry**

Determine wether the following acids are strong or weak? NOTE: all numbers in the chemical compounds below are subscripts belonging to the element before it, NOT COEFFICIENTS. a.)HCl b.)H2SO3 c.)HNO2 d.)H3PO2 e.)HNO4 f.)H2SO5 g.)HI
*January 14, 2009*

**math**

what relation is a doorstep to a doormat
*January 11, 2009*

**year 8 art**

I've got loads of art homework and there is one bit i'm struggling with i have to use a digital camera take a picture of a household object then distort the image using a graphics package on a computar in four different ways and im finding it hard to understand. Thanks
*December 29, 2008*

**chemistry**

What is 1.384 kg multiplied by 5.4 square meters?
*October 19, 2008*