Saturday

July 12, 2014

July 12, 2014

Total # Posts: 140

**Physics**

Consider a torque ⃗τ that is constant in both magnitude and direction, and acts on a rigid body of mass 10 kg at a point 1 m from the pivot. How much work does the torque do on the rigid body, if it turns through an angle of 180◦ while the torque is acting? As...

**Physics**

Given: A flat dance floor of dimensions lx = 24 m by ly =23m and has a mass of M = 1200 kg. Use the bottom left corner of the dance floor as the origin. Three dance couples, each of mass m = 110 kg start in the top left, top right, and bottom left corners. What is the initial ...

**Physics**

Given: A flat dance floor of dimensions lx = 24 m by ly =23m and has a mass of M = 1200 kg. Use the bottom left corner of the dance floor as the origin. Three dance couples, each of mass m = 110 kg start in the top left, top right, and bottom left corners. What is the initial ...

**Physics**

A horizontal disk with a radius of 23 m ro- tates about a vertical axis through its center. The disk starts from rest and has a constant angular acceleration of 5.5 rad/s2. At what time will the radial and tangen- tial components of the linear acceleration of a point on the ri...

**Physics**

Consider a torque ⃗τ that is constant in both magnitude and direction, and acts on a rigid body of mass 10 kg at a point 1 m from the pivot. How much work does the torque do on the rigid body, if it turns through an angle of 180◦ while the torque is acting? As...

**Physics**

A 2.73 kg particle has a velocity of vx = 6.02 m/s and vy = 0.316 m/s. Find the magnitude of its total momentum. Answer in units of kg · m/s

**physics**

A block of mass 2.5 kg is pushed up against the vertical wall by a force of 60 N acting at 47◦ to the ceiling. The coefficient of kinetic friction between the block and the wall is 0.67. The acceleration of gravity is 9.8 m/s2 . Find the work done by this force in moving...

**physics**

A single constant force 18.1 N acts on a particle of mass 2.92 kg. The particle starts at rest at t=0. What is the instantaneous power delivered by the force at t=4.48s? Answer in units of W

**physics**

A rain cloud contains 3.11 × 107 kg of water vapor. The acceleration of gravity is 9.8 m/s2 . How long would it take for a 1.8 kW pump to lift the same amount of water to an altitude of 20000 m? Answer in units of years

**physics**

A car and driver weighing 7750 N passes a sign stating “Bridge Out 28.5 m Ahead.” She slams on the brakes, and the car decelerates at a constant rate of 10.6 m/s2 . The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the work done stopping the car if t...

**physics**

A spring with spring constant of 30 N/m is stretched 0.19 m from its equilibrium position. How much work must be done to stretch it an additional 0.077 m? Answer in units of J

**Physics**

Two blocks connected by a string are pulled across a rough horizontal surface by a force applied to one of the blocks, as shown. The acceleration of gravity is 9.8 m/s2 . If each block has an acceleration of 5.2 m/s2 to the right, what is the magnitude of the applied force? An...

**Physics**

A string under a tension of 68 N is used to whirl a rock in a horizontal circle of radius 3.7 m at a speed of 16.53 m/s. The string is pulled in, and the speed of the rock increases. When the string is 0.896 m long and the speed of the rock is 71.5 m/s, the string breaks. What...

**Physics**

In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.45 × 106 m/s. Find the central force acting on the electron as it revolves in a circular orbit of radius 5.18 × 10−11 m. Answer in units of N

**Physics**

Zak, helping his mother rearrange the furni- ture in their living room, moves a 48.9 kg sofa 3.3 m with a constant force of 21 N. What is the work done by Zak on the sofa? Neglect friction. Answer in units of J

**Physics**

A 17.9 kg block is dragged over a rough, hor- izontal surface by a constant force of 74.1 N acting at an angle of angle 32.3◦ above the horizontal. The block is displaced 72.4 m and the coefficient of kinetic friction is 0.242. Find the work done by the 74.1 N force. The...

**Physics**

A car is moving at 50 miles per hour. The kinetic energy of that car is 5 × 105 J. How much energy does the same car have when it moves at 114 miles per hour? Answer in units of J

**NAU**

When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 80.6-kg man just before contact with the ground has a speed of 6.59 m/s. (a) In a stiff-legged lan...

**need asap trigg**

simplify the expression by using a double angle formula or a half angle formula: a. 2 tan 7 degrees /1-tan^2 7 degrees b.2 tan 7 theta / 1-tan^2 7 theta

**Trigg**

thanks but I'm still stumped by what they mean about how and what the double angle formula is. The double angle formula confuses me

**Trigg**

Find sin 2x, cos 2x, and tan 2x from the given infomation csc x=4, tan x < 0

**Please help Math**

1.square root 2 - 1 or 2^1/2 -1 2.I got -1/2 2^1/2-2^1/4 or -1/2 *square root 2 minus square root 2 (the second 2 has two square roots over it)

**Math Trigg**

Find sin 2x, cos 2x, and tan 2x from the given infomation csc x=4, tan x < 0

**USA STUDIES**

What were some of the benefits of the Articles of Confederation?

**physics**

to determine that force acting on each mass it was assumed that g=9.8m/s^2. The value of g at the place where the experiment is performed may be slightly different from that value. state what effect it would have on the percentage error calculated for the comparisons to test y...

**Math-Probability **

Please explain how to get the answer.I have now idea. 1.If you roll two fair dice,one red and one green,what is the probability of getting a 2 on the red die and a 3 on the green die? Give answer in a reduced fraction. 2.If you roll two fair dice,one red and one green,what is ...

**Chemistry **

Make sure the water’s Mass is still set to 1.0 kg and its Temp is 25 °C. Set the cylinder’s Height to 500 m. How does doubling the mass affect the temperature change of the water?

**math**

x+2y+3z=-52

**Chemistry ?**

How many moles are contained in a 4.67-L sample of gas at 30°C and 199 kPa? A. 1.7 mol B. 11.8 mol C. 0.37 mol D. 3.7 mol I guessed D, but I'm not sure.

**Chemistry help?**

The mass of a quantity of NiCl2 is 24.6 g. How many formula units are in the sample? A. 3.2 3 1023 NiCl2 formula units B. 5.3 3 10–21 NiCl2 formula units C. 1.1 3 1023 NiCl2 formula units D. 1.9 3 1027 NiCl2 formula units

**Chemistry?**

What mass of sulfur has to burn to produce 4.5L SO2 at 300°C and 101 kPa in the following reaction? S(s) + O2(g) -> SO2(g) A. 3.07 g S B. 68.8 g S C. 41.0 g S D. 13.5 g S

**Legal Studies**

I nee help to write my legal studies assignment that's due tomorrow,any want to help?

**7TH GRADE SCIENCE?!?!**

(1 pt) electrical; kinetic; sound; kinetic; electrical 5.3 I promise.

**math**

a rectangle has a base of 25 in. and a height of 15 in. if the shape is dilated with a scale factor of .6, what is the area of the new shape?

**Math**

For a chemistry experiment, Heather needs 3.75 grams of salt. How many decigrams of salt does Heather need?

**physics**

a student is on a rotating merry-go-round at a constant rate and tosses her apple in the air. if the apple in thrown up with a velocity of 1.2 m/s and the student catches it again after rotating 5.00 revolutions, how fast is the merry-go-round spinning in radians per second?

**physics**

An airplane starts at rest and accelerates down the runway for 20s. At he end of the runway, it's velocity is 80 m/a north. What is its acceleration?

**Geometry**

Find KN and LM. In triangle LKM, angle L is bisected. Line segment LK is 11, line segment KN is x-4, line segment NM is 5.4, and line segment LM is 2x + 1.3 (there is a drawing of this triangle) Thanks.

**Math**

Thank You so much for your help!!!!

**Math**

answer is 4

**Math**

Do the x both equal the same number?

**Math**

Eight times a number equals 24 more than two times the number. What is the number?

**Math**

A number equals four less than three times the number. What is the number?

**science**

why does the sun come out write after i rains

**Chemistry**

I have to sort compounds into groups, separating them by if they are acidic, Ionic, or Covalent. Heres the list: Calcium Carbonate Sodium Hypochlorite Sodium Chloride Sodium Hydrogen Carbonate Acetic Acid Ammonium Hydroxide Silicon dioxide Magnesium Sulfate Carbon Dioxide Magn...

**Algebra**

Q+2/5=2q-11/7 •7/7. •7/7 7q+14/35=10q-55/35 •35. •35 7q+14=10q-55 -7q. -7q 14=3q-55 +55. +55 69=3q /3. /3 23=q

**physics**

If an object wishes to travel 165 km at a rate of 45 mi/hr...how long will it take the object to reach their destination in hours and minutes.

**science **

please help me i am in 4th grade and i need help on my science project. my science project is, is smiling contagious and i have no idea what to do for research and data

**Math**

I need help and I forgot my book and class please help me solve theses Sr = SQUARE ROOT 1. What is the solution to -75 sr to the nearest integer? (1 point) 9 8 -8 -9 2. Shelly sews a blanket that has an area of 170 square feet. It has 30 square blocks, each the same size. What...

**math**

Cameron is making bead necklaces. He has 90 green beads and 108 blue beads. What is the greatest number of identical necklaces he can make if he wants to use all the beads?

**Biochemistry**

This is my last question and I just am not getting it for some reason. Prepare a 500 ml of 0.15 M tris buffer, pH 8.25 from tris mono hydrochloride, 0.400 M HCL, and 0.350 M NaOH. Determine amounts needed and them write the recipe. Pka for tris is 8.00

**Exercise**

Why not just do simple exercises every day, because I think that wll help you get muscle and lose weight. I think that should help you out in your particular situation.

**English 7 - **

I think this is a really good piece of writing.

**3 grade math ms sue**

Yes, your son did it right.

**Math**

How do you find a vertical and asymptote of a linear function?

**physics**

A ball player hits a home run, and the baseball just clears a wall 17.3 m high located 131.0 m from home plate. The ball is hit an an angle of 35° to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1.0 m above the ground. (a) What is...

**spanish**

what goes in the blank son or estan aquellos profesores _______ muy inteligentes.

**Physics Help**

A ball of mass 1.76 kg is tied to a string of length 4.19 m as shown in Figure P6.50. The ball is initially hanging vertically and is given an initial velocity of 9.4 m/s in the horizontal direction. The ball then follows a circular arc as determined by the string. What is the...

**Physics**

Two objects, A and B, have the same kinetic energy. A has a speed that is 12.1 times greater than the speed of B. What is the ratio of the mass of B to the mass of A? I'm not sure how to do this one given... KE_A = KE_B & V_A = 12.1V_B How do I find the ratio of the mass??

**Physics!**

A roller coaster track is designed so that the car travels upside down on a certain portion of the track, as shown in Figure P5.20. What is the minimum speed the roller coaster can have without falling from the track? Assume the track has a radius of curvature of 32.1 m.

**Physics**

Asteroid satellite: While on its way to Jupiter in 1993, the Galileo spacecraft made a flyby of asteroid Ida. Images captured (Fig. P5.66) of Ida discovered that the asteroid has a tiny moon of its own, since given the name Dactyl. Measurements found that Ida to be about 55 &t...

**healthcare**

Hospitals are generally categorized as nonprofit, for-profit or government. • Provide a few details about the three categories of hospitals. Identify at least one example of each from your community or state. • What are the differences in populations served by these ...

**healthcare**

Hospitals are generally categorized as nonprofit, for-profit or government

**math **

what is correcting quotients

**pre-algebra**

I can not solve this problem: 3/4 =5/x

**math**

what is 1/8 + 5/6 + 2/3 reduced

**Algebra **

The measures of two sides of a parallelagram are 28 in and 42 in. If the longer diagonal has measure 58 in, find the measures of the angles at the vertices

**science**

why are dog fleas more successful parasitesthen bacteria that cause deadly diseases?

**science**

Yes this is a crossword puzzle, there are six letter and the only letter I have so far is the letter a.

**Math/Writing-HELP PLEASE**

Explain why a trapezoid a quadrilateral, but why all trapezoids are not always quadrilaterals. If a shape has four sides, no equal angles or sides, what is it? This is an opinion fill in the blank, but I can't think of any words. You give me love, You gave me life, you giv...

**US History**

Why was control of the seas so important for the Allies and the Axis?

**math**

you get off your lazy ass and do it.

**math**

how can i findout how to do a histogram of 2 tables 1 with 3 intervals and the other with 4

**physics**

i still dont understand????

**physics**

a lot of ppl in my science class have trouble with this problem... pls show your work if you know how to solve it. A juggler throws a ball from height of 0.950 m with a vertical velocity of +4.25 m/s and misses it on the way down. What is its velocity when it hits the ground?

**Chemistry HELP**

40.0 mL of 0.1880 M formic acid is titrated with 30.0 mL of 0.2010 M NaOH. Pka of formic acid is 3.8. What is the pH of the titration?

**Algebra**

Form a polynomial f(x) with real coefficients having the given degree and zeros. Degree 5; zeros:1;-i; -7+1

**physics**

can you please help me with this identical problem? A juggler throws a ball from height of 0.950 m with a vertical velocity of +4.25 m/s and misses it on the way down. What is its velocity when it hits the ground?

**Chem**

Classify each situation by the equation that would quantify it. A. A container of ammonia cleaner is stored in the janitor's closet off a lecture hall after being used at night for cleaning. The container has a very small hole in the lid. The next morning the entire lectur...

**Chemistry**

One method of removing CO2(g) from a spacecraft is to allow the CO2 to react with LiOH. 2LiOH(s)+CO2(g)---->Li2CO3(s)+H2O(l) How many liters of CO2(g) at 25.5 degrees celsius and 749 Torr can be removed per 9kg of LiOH consumed?

**Chem**

Identify the Oxidizing agent and the reducing agent for Al(s)+3Ag^+(aq)--->Al^3+(aq)+3Ag(s) Express your answers as chemical formulas serperated by a comma. I tried putting in Al,3Ag^+ and 3Ag,Al^3+ I keep getting it wrong and only have one attempt left I need help please.

**Chem**

Enter the net ionic equation for the reaction of aqueous sodium chloride with aqueous silver nitrate. I know the equation is AgNO3(aq)+NaCl(aq)---->NaNO3(aq)+AgCl(s) Is Ag^+(aq)+ Cl^-(aq)--->AgCl(s) right?

**Chem**

What is the correct net ionic equation for the following set of reactants? Ba(OH)2(aq)+H2SO4(aq)---->2H2O(l)+BaSO4 I keep getting the answer as 2OH^- + 2H^+ ----> 2H2O(l) but it counts it wrong.

**Chemistry**

How many milliliters of 8.40×10^2M Ba(OH)2(aq) are required to titrate 48.65mL of 5.26×10^2M HNO3?

**ipc**

does a comound have a set or variable composition?

**Chemistry**

Anhydrous CuSO4 can be used to dry liquids in which it is insoluble. The CuSO4 is converted to CuSO4.5H2O, which can be filtered off from the liquid. What is the minimum mass of anhydrous CuSO4 needed to remove 12.4g H2O from a tankful of gasoline?

**Chemistry**

What is the minimum mass of anhydrous CuSO4 needed to remove 12.4g H2O from a tankful of gasoline?

**science**

35m=_________km

**7th grade**

The diameter of a spider's thread is 1.0 x 10 -3 inch. Write the number in standard form.

**Math**

slope intercept form is y=mx+b so you have to plug them in.

**math**

I dont know

**math**

Two adjacent sides of a rhombus are represented by 5x+7 and 6x-1. Find the value of x

**Socials**

Why is there so much diversity in the interior plains region ?

**Chemistry**

Balance

**Math**

A rectangular pad of concrete is outlined by a 52-m stripe of paint. Find the dimensions of this pad if the surface area is 168m^2. drwls: Is there any way you can explain why you did what you did? I don't understand. You had this: 2 (L + W) = 52 (perimeter) L*W = 168 (are...

**Math**

A rectangular pad of concrete is outlined by a 52-m stripe of paint. Find the dimensions of this pad if the surface area is 168m^2.

**math**

The base of a triangle is 10 cm longer than the height. Determine the height of the triangle if its area is 48 cm^2. -I just plugged in number and got 6cm for the height and 16cm for the base. But I need to show work and I cant remember how to solve this.

**math**

drawing a red checker from bag of 9 black checksrs and 6 red checkers, replacing it and drawing another red checker

**6th grade science**

i forgot my science book!!!!!!!! How am i supposed to do my homework? someone plz help me!!!!!!

**6th grade science**

i forgot my science book!!!!!!!! How am i supposed to do my homework? someone plz help me!!!!!!