Tuesday
July 22, 2014

Search: An elevator (mass 4125 kg) is to be designed so that the maximum acceleration is 0.0900g. What is the maximum force the motor should exert on the supporting cable?

Number of results: 22,984

physics
A simple pendulum consists of a ball of mass 5.39 kg hanging from a uniform string of mass 0.0789 g and length L. The period of oscilla- tion for the pendulum is 2.51 s. Determine the speed of a transverse wave in the string when the pendulum is station- ary and hangs ...
June 20, 2011 by ryan

physics
A sinusoidal wave in a rope is described by the wave function y = A sin(k x + ! t) , where A = 0.47 m, k = 1 m−1, ! = 26 Hz, x and y are in meters, and t is in seconds. vibrator 26 Hz = 3.8 g/m m 18.8496 m If the tension in the rope is provided by an arrangement like ...
June 20, 2011 by ronda

physics
A block with mass = 5.0 rests on a frictionless table and is attached by a horizontal spring ( = 130N ) to a wall. A second block, of mass = 1.35 , rests on top of the block . The coefficient of static friction between the two blocks is 0.40. What is the maximum possible ...
January 24, 2013 by steve

physics
A block with mass = 5.0 rests on a frictionless table and is attached by a horizontal spring ( = 130N ) to a wall. A second block, of mass = 1.35 , rests on top of the block . The coefficient of static friction between the two blocks is 0.40. What is the maximum possible ...
January 24, 2013 by steve

EARTH SCIENCE
1. What measurement best describes the results of a scientific experiment regarding volume? A. 1425 mL B. 5 quarts C. 2 pints D. 125 gallons A? 2. How is the mass number calculated for an element? A. The product of neutrons and protons B. There is no calculation. C. The ...
January 7, 2014 by Beatrice

Chemistry
I have a few problems im having trouble with, any help..? 1. If a peice of aluminum with mass 3.90g and a temperature of 99.3C is dropped into 10.0cm^3 of water at 22.6C, what will be the final temperature of the system? 2. If a peice of cadmium with a mass 65.6g and a temp. ...
September 23, 2009 by Dylan

chemistry
Antimony forms 2 chlorides having widely different properties. One of the chlorides is a solid that melts at 73*C and contains 46.5% chlorine by mass. The other is a liquid that boils at 140*C and contains 59.3% chlorine by mass. Show how these results illustrate the low of ...
October 7, 2011 by sam

physics
Two fighter jets are flying towards each other. Jet A, with a mass of 15000 Kg, is traveling to the right with a speed of 255 m/s, whereas Jet B, with a mass of 34000 kg, is traveling to the left at 145 m/s. If the collision is perfectly inelastic, determine the final velocity...
January 21, 2012 by sand

physics
the brake linings of the wheels of a car have total mass 4.8kg and specific heat capacity 1200 J kg -1 K-1. calculate the maximum possible temperature rise of the brake linings when the car (of mass 800kg) travelling at 15 ms-1 is brought to rest by applying the brakes.
January 25, 2012 by jeremy

Chemistry H.
Indium has two naturally occurring isotopes and an atomic mass of 114.818 amu. In- 113 has a mass of 112.904 amu and an abundance of 4.3%. What is the identity and percent abundance of indium's other isotope. I am very confused on how do I set up this conversion problem?
September 23, 2012 by Jennifer

Chemistry
A 0.5370 g sample of a pure soluble chloride compound is dissolved in water, and all of the chloride ion is precipitated as AgCl by the addition of an excess of silver nitrate. The mass of the resulting AgCl is found to be 1.2523 g. What is the mass percentage of chlorine in ...
October 25, 2012 by Orla

PHYSICS
WHEN SIX PEOPLE WHOSE AVERAGE MASS IS 84 KG SIT DOWN IN A CAR, THEY FIND THAT THE CAR DROPS .84 CM LOWER ON ITS SPRINGS. THEN THEY HAVE GET OUT OF THE CAR AND BOUNCE IT UP AND DOWN. THE ACCELERATION OF GRAVITY IS 9.8 M/S^2. WHAT IS THE FREQUENCY OF THE CAR'S VIBRATION IF ITS ...
January 13, 2013 by KOCHU

physics
An automobile has a mass of 2150 kg and a velocity of +18 m/s. It makes a rear-end collision with a stationary car whose mass is 1850 kg. The cars lock bumpers and skid off together with the wheels locked. What is the velocity of the two cars just after the collision?
July 10, 2013 by GET DAT

chemistry
A 0.5917 g sample of a pure soluble chloride compound is dissolved in water, and all of the chloride ion is precipitated as AgCl by the addition of an excess of silver nitrate. The mass of the resulting AgCl is found to be 1.5683 g. What is the mass percentage of chlorine in ...
March 3, 2014 by smith

Physics
A cannon of mass 200kg, fires a cannonball with a mass of 10kg. The cannon ball leaves the barrel of the cannon with a velocity of 60 m/s. Using the law of conservation of momentum , explain what happens to the cannon when the cannon ball is fired. (Answer should include ...
March 22, 2011 by Nelly

chem
if the mass of a copper wire before an experiment wieghed 2.82 grams then after it wieghed 2.57 grams. what is the mass of copper that reacted
May 22, 2011 by Cassie

chemistry
vinegar is 5% acetic acid by mass and has a density of 1.02g/mL.what mass of acetic acid ,in grams, is present in 185 mL of vinegar.
August 26, 2011 by marion

physics
A learner with a mass of 40 kg rides on a skate board with a mass of 3 kg. The resultant force on the learner and the skate board is 90 N. Calculate his acceleration.
April 11, 2013 by Anonymous

physics
A learner with a mass of 40 kg rides on a skate board with a mass of 3 kg. The resultant force on the learner and the skate board is 90 N. Calculate his acceleration.
April 11, 2013 by Anonymous

Chemistry 11
calculate the mass of impure KOH needed to make up 1.20 L of 0.60 mol/L KOH(aq)? Assume the impure KOH is 84% KOH by mass and 16% water.
June 16, 2013 by LG

please answer this one..
what is the mass in grams of one molecule of water... and is this one different from what is the mass in grans of one mole of water?
March 19, 2014 by Katie

Physics
The mass of a certain planet is six times the mass of the earth and the diameter of the planet is twice the diameter of the earth. Find the acceleration od gravity on the surface of this planet. HELP ME SOLVE! THANKS!
October 15, 2009 by Shane

physic
Two spherical balls are placed so their centers are 2.6 m apart. The force between the two balls is 2.75 x 10-12 N. What is the mass of each ball if one ball is twice the mass of the other ball?
January 18, 2010 by susan

physics
Two spheres are placed so that their centers are 2.9 m apart. The force between the two spheres is 2.60 multiplied by 10-12 N. What is the mass of each sphere if one sphere is twice the mass of the other sphere?
December 11, 2010 by DESPERATE

physics
A boy on roller blades throws a jug of water away from himself, giving it a speed of 10 m/s. The boy's mass is 50 kg and the mass of the jug and water is 9 kg. What is the velocity gained by the boy?
December 30, 2010 by Sam

chemistry
Bottle A has a volume of 1.2 L, When Filled with sugar water the bottle has a total mass of 5.0 pounds. If the empty bottle has a mass of 800 grams. determine the density of the sugar water in g/mL.
August 17, 2011 by Yoyo

physics
differentiate between density,mass and volume. state a formula in terms of mass density and volume. using the formula calculate the volume of a 10kg block of ice
February 12, 2012 by john

Chemistry
A 50.0 mL graduated cylinder has a mass of 67.6 g. When it is filled with an unknown liquid to the 38.8 mL mark, the cylinder and liquid combined have a mass of 119.4 g. Calculate the density of the liquid in g/cm3. (1 mL = 1 cm3.)
September 12, 2012 by H

chemistry
When 86.7 g of water at a temperature of 73 C is mixed with an unknown mass of water at a temperature of 22.3 C the final temperature of the resulting mixture is 61.7 C. What was the mass of the second sample of water? (Specific heat of water 4.184 Jg-1C-1)
April 9, 2013 by Anonymous

chemistry
When 86.7 g of water at a temperature of 73 C is mixed with an unknown mass of water at a temperature of 22.3 C the final temperature of the resulting mixture is 61.7 C. What was the mass of the second sample of water? (Specific heat of water 4.184 Jg-1C-1)
April 9, 2013 by Anonymous

gr 11 physics
as a rocket carrying a space probe acceleraes away from earth the fuel is being used up and the rocket's mass becomes less when teh mass of a rocket(and its fuel) is M and the distance of teh rocket from eart's centre is 1.5rE, the force of gravitational attraction between ...
November 26, 2009 by mat

Science
Two masses of 20 and 10 kg are moving in the same direction and one directly behind the other. The 20-kg mass is behind and moving at 10m/s and the other is moving at 5m/s. The masses collide and after the collison, the 20kg mass moves at 6m/s find the after-collison velocity ...
August 21, 2006 by Hannah

please check over my work
A 2.5 kg stone is released from rest and falls toward earth. After 4s, the magnitude of its momentum is: My work: J=F*t =(F *t)= 24.5N * 4s F= 2.5 *9.81= 24.5 J=P P= 98kg m/s A sphere X, of mass 2kg, is moving to the right at 10m/s. Sphere Y, of mass 4 kg is moving to the left...
November 18, 2006 by tatiana

Science
A little aluminum boat (mass of 14.50g) has a volume of 450.00cm3. The boat is placed in a small pool of water and carefully filled with pennies. If each penny has a mass of 2.50g, how many pennies can be added to the boat before it sinks?
October 16, 2008 by Kevin

physics
The spring constant can be determined from the oscillatory motion. For this case, Newton's second law gives (md^2x)/(dt^2) + kx = 0 where x is the displacement from the equilibrium position. The sample mass is suspended from the spring by a sample holder. Does m in this ...
August 8, 2010 by Sara

Physics
You are pulling your little sister on her sled across an icy (frictionless) surface. When you exert a constant horizontal force of 114 N, the sled has an acceleration of 2.3 m/s2 If the sled has a mass of 7.6 kg, what is the mass of your little sister? I don't need the answer...
October 25, 2012 by Help Please

chemistry
The gaseous product of a reaction is collected in a 30.0 L container at 37 degrees C. The pressure in the container is 2.5 atm and the gas has a mass of 85.0 grams. What is the molar mass of this gas? I know the correct answer is 28.8 g/mol but I need to know how to get the ...
February 7, 2013 by Kat

Physics
A satellite is given a boost of 540 MJ of energy to move it from its initial orbit at an altitude of 150 km to a higher altitude orbit. If the satellite has a mass of 1.16 ✕ 10^3 kg, what is the new altitude it reaches? Take the mass of the Earth to be 5.97 x 10^24 kg ...
April 2, 2014 by Dan

chemistry needs another look plz
Posted by Lori on Tuesday, December 14, 2010 at 5:38pm. The mole fraction of an aqueous solution of potassium perchlorate is 0.125. Assuming that the density of this solution is 1.20g mL-1, calculate the following: (A) the mass percent of potassium perchlorate in the solution...
December 14, 2010 by Lori

Physics
Lubricating oil, with a relative density of 0.79, flows around a 90 bend. The pipe diameter is 0.45m, and the oil has a pressure head of 7m and the flow is 1.7m3/s. Find the force exerted by the oil on the bend. Oil density = 0.79 X 103 Volumetric mass flow rate = 1.7 m3/s ...
April 22, 2009 by Henri

Physics
Lubricating oil, with a relative density of 0.79, flows around a 90 bend. The pipe diameter is 0.45m, and the oil has a pressure head of 7m and the flow is 1.7m3/s. Find the force exerted by the oil on the bend. Oil density = 0.79 X 103 Volumetric mass flow rate = 1.7 m3/s ...
April 23, 2009 by Henri

American Govt.
Dejure discrimination and defacto discrimination are two ways in which some americans are less equal than others. Examples of public policies designed to address each of these forms of discrimination are: A.Brown decision (dejure) and affirmative action(defacto).B.Affirmative ...
August 19, 2012 by Lisa

physics
a) You are sitting at the center of the back seat of a car without seat belts and friction is low. The car suddenly makses a right turn. Describe what happens to you. WHich of Newton's laws is applicable? The car would be goind straight before the turn so when it suddenly ...
November 20, 2006 by Benji

Physics
A proton of mass mP and a positively charged nucleus of mass 9mP are widely separated and traveling towards each other at the same speed of 1500 m/s along the same line.  Because they are both positively charged, they repel each other and undergo a soft head-on collision.  ...
October 25, 2012 by AH

Chemistry
The calcium in a 150 mL sample of water from the Ogeechee River at a location near Savannah was determined by precipitating Ca2+ as CaC2O4.H2O (FW=146.115 g/mol). The precipitate was collected by filtration, washed and then ignited [turning the CaC2O4.H2O into CaO (FW=56.079 g...
March 27, 2011 by Anonymous

physics
Two balls of equal mass collide and stick together as shown in the figure. The initial velocity of ball B is twice that of ball A. (Take = 34.) (a) Calculate the angle above the horizontal of the motion of mass A + B after the collision. 1 Units are required for this answer...
February 25, 2011 by important

Physics
1) Find the magnitude of the gravitational force a 68.6 kg person would experience while standing on the surface of Earth with a mass of 5.98 10 24 kg and a radius of 6.37 10 6 m. The universal gravitational constant is 6.673 10 −11 N m2 /kg 2 . Answer in units ...
January 29, 2013 by Jocelyn

Chemistry
CaCO3(s) <--> CaO(s) + CO2 (g) A 5.9-gram sample of CaCO3 (molar mass = 100.) is placed in an evacuated 2.00L container and heated to 200^oC. Equilibrium is reached when 5.15% of the CaCO3 has decomposed. 1)Write the Kp expression for this reaction and calculate its ...
March 3, 2011 by Patrick

Chemistry
Hi there, I am doing some data calculations for my lab, but I'm having some trouble. Given: Mass of ferrous ammonium sulfate=4.0g Mass of K3[Fe(C204)3] 3H20 =4.53g 1. Using the above mass of ferrous ammonium sulfate, calculate the theoretical yield of the K3[Fe(C204)3] 3H20. 2...
November 16, 2010 by David

AP physics
On Block has a mass M=500 g, the other has mass m=460 g, they are hooked to a string and is on a pulley will one mass on either side, the pulley, which is mounted in horizontal frictionless bearings, has a radius of 5 cm. When released from rest, the heavier block falls 81.5 ...
January 27, 2008 by Kristen

Chemistry
im not quite sure what to do with this problem... the info I have: -balanced equation= (CuCl2*2H20)=>CuCl2+2H2O -initial mass of copper compound: 0.94g Q: use stiochiometry to find the theoretical yield for the mass of copper (II) chloride we also used 30mL of water in our ...
February 28, 2010 by Sophie

Chemistry
8.40 grams of Hydrogen gas reacts with 48.2 grams of Oxygen gas. Give the mass of the water vapor produced and the mass of the excess reactant left over. Can somebody please explain stoichiometry to me? I've failed the test and the retest. I'm usually able to balance the ...
November 29, 2010 by Anna

HELP!!!
A light, inextensible cord passes over a light, frictionless pulley with a radius of 10 cm. It has a(n) 24 kg mass on the left and a(n) 6.1 kg mass on the right, both hanging freely. Initially their center of masses are a vertical distance 4.3 m apart. The acceleration of ...
February 14, 2013 by Anonymous

physics
Calculate the magnitude of the linear momentum for the following cases. (a) a proton with mass 1.67 10-27 kg, moving with a speed of 4.00 106 m/s (b) a 16.5 g bullet moving with a speed of 270 m/s (c) a 70.5 kg sprinter running with a speed of 12.5 m/s (d) the Earth (mass = 5....
July 7, 2008 by Elisa

Science 8 grade
A little aluminum boat (mass of 14.50g) has a volume of 450.00cm3. The boat is placed in a small pool of water and carefully filled with pennies. If each penny has a mass of 2.50g, how many pennies can be added to the boat before it sinks?
October 16, 2008 by Thao

Chemistry
Combustion analysis of 0.343 g of a compound containing C, H, and O produces 0.753 g of CO2 and 0.411 g of H2O. Mass spectral analysis shows that the compound has a molar mass around 120 g mol-1. What is the compound's: Empirical Formula:----- Molecular Formula:-----
March 25, 2010 by Abraham

chemistry
Combustion analysis of 0.213 g of a compound containing C, H, and O produces 0.468 g of CO2 and 0.255 g of H2O. Mass spectral analysis shows that the compound has a molar mass around 120 g mol-1. What is the compound's: Empirical Formula:(-------) Molecular Formula:(--------)
April 3, 2010 by sam

Chemistry
Combustion analysis of 0.284 g of a compound containing C, H, and O produces 0.623 g of CO2 and 0.340 g of H2O. Mass spectral analysis shows that the compound has a molar mass around 120 g mol-1. What is the compound's: Empirical Formula: Molecular Formula:
April 8, 2010 by Darali

Physics
The mass of an astronaut is 72kg. (a) what is his weight on earth ( taking g to be 10N/kg) ? (b) if the astronaut is on the moon's surface where the acceleration due to gravity is one-sixth on the earth , calculate (I) the mass (ii) the weight of the astronaut Thanks for ...
June 2, 2011 by Lina

physics ( please help me)
A brick with a mass of 0.400kg is pressed against a vertical spring with force constant k=500 N(m^-1) such that the spring is compressed 0.200m. When the brick is released, how high does it rise from this position? (the brick and the spring are not attached. The spring has ...
February 23, 2012 by taylor

work and energy(physics)
A mass m = 12.0 kg rests on a frictionless table and accelerated by a spring with spring constant k = 4597.0 N/m. The floor is frictionless except for a rough patch. For this rough path, the coefficient of friction is μk = 0.49. The mass leaves the spring at a speed v = 3...
November 2, 2012 by Anonymous

Physics
A bullet with a mass of 10 imbeds itself in a wooden block of mass 3990g and is free to move. If the speed of the block and bullet together is 50 cm/s just after the impact what was the original speed of the bullet ? what was the right formula to use.? pls anwer me.
November 21, 2012 by Mary Grace

physics
A 2 kg mass falls 40 m and buries itself into the ground 0.40 m. Find: a) How much work was done by gravity, b) How much potential energy was lost, and c) What was its speed when it hit the ground, and d) the average force causing the mass to stop once it hit the ground.
November 28, 2012 by Ted

Physics (Formula)
A string requires a 191.0 N force in order to break. A 1.75 kg mass is tied to this string and whirled in a vertical circle with a radius of 1.92 m. The maximum speed that this mass can be whirled without breaking the string is Again I just need the formula!
February 13, 2013 by Eve

Dynamics of Rigid Bodies
Two cars, A and B, are traveling along the same route. Car A is traveling at 4.5 m/s and has a mass of 1150 kg. Car B is traveling at 6.7 m/s and has a mass of 1300 kg. If car B gently bumps into car A and their bumpers lock together, what will be their common velocity then?
April 10, 2013 by Anonymous

PHYSICE
A uniform beam of length L whose mass is m, rest with its ends on two digital scales ( Figure 13.2). A block whose mass is M rests on the beam, its center is one-fourth away from the beam's left end. What do the scales read ?
May 21, 2013 by VICTOR

physics
Two boxes are connected by a cord running over a pulley as shown in the picture below. Box I of mass 8.0 kg is on the top of the table; the coefficient of kinetic friction between box I and the table is 0.10. Box II has a mass of 15.0 kg. What is the tension in the cord? 35 N ...
February 5, 2014 by ashley

Physics-Please check
Which of the following confirms that gravitational mass and inertial mass are equal? I posted this about three hours ago and no one answered it so I'm hoping someone can look at my answer and direct me 1.Free-fall accleration is the same throughout the universe 2.Free fall ...
November 21, 2010 by Annie

chem
I am posed with a question which, in order to be solved, needs the Van't Hoff Factor of ethylene glycol. Some research has shown me that ethylene glycol is an electrolyte, but I don't know how it dissociates in water. Any help would be appreciated. It is not an electrolyte and...
March 24, 2007 by Jakob

chemistry
In the chemistry exp molar mass of a volatile liquid what will be the outcome if the hole in the aluminu foil was larger would it make the molar mass high or low. Or what will happen if yhr water vapors condensed under the aluminum foil before the final weighing
April 10, 2012 by tiffany

Physics(please help)
Four very thin rods, each 8.3 m long, are joined to form a square. The center of mass of the square is located at the coordinate origin. The rod on the right is then removed. What are the x- and y-coordinates of the center of mass of the remaining three-rod system? I have no ...
June 3, 2012 by Hannah

Physics
A low friction cart of mass m, traveling at speed v, collides (perfectly) elastically with a cart of triple the mass, initially at rest. What is the result of this collision? (What are the final, after-collision velocities?) Do NOT use the derived equations from the textbook. ...
August 10, 2012 by Chad

Physics
Three blocks are in contact with each other on a frictionless horizontal surface. A 417 N horizontal force is applied to the block with mass of 3.7 kg as shown in the figure below. The acceleration of gravity is 9.8 m/s^2. (the picture looks like this) F *----->[3.7 ...
November 16, 2012 by alice

Physics
A spacecraft of mass 2000kg, moves at a constant speed of 7800m.s- in space. the main engine switched on for 10s during which time the exhaust gases travels at 10 000m.s-. As a result of this, the craft travels at 8000m.s- after 10s. Calculate the mass of the exhaust gas.
February 12, 2013 by Kerry

Physics
A bullet of mass 10.6 grams is fired with a speed of 125 meters per second toward a wood block of mass 187 grams initially at rest on a very smooth (assume frictionless) surface. What is the change in momentum of the bullet if it becomes embedded in the block?
October 10, 2013 by Matt

chemistry
MASS (GRAMS) Nac1- 0.9992 C12H22O11- 0.9822 NH4C1- 0.9510 C6H5OH- 0.9723 C9H20- 1.0038 *Find the Molar Mass (g/mol) for each * *Find the Moles of each element for each * *Find the Atoms of each element for each * - if possible show work and or equation set up to find answers
November 8, 2013 by Jessica

Algebra
The purity of gold is measured in karats. Twenty-four karat gold is pure gold and k karat gold is k/24 gold by mass. One piece of 16-karat gold jewelry has a mass of 30 grams and another piece of 10-karat gold jewelry has a mass of 40 grams. Find the number of grams in the ...
January 26, 2011 by Laur

Psychology 202
Neurologists involved in animal research studies of cognitive function see analogies in humans that suggest mental exercise reduces loss of brain mass. Which of the following statements describe their findings? (Points :1) Older adults who continue complex mental activities ...
March 4, 2010 by Melissa

Chemistry
A student heats 5.128g of the sodium carbonate/sodium bicarbonate mixture to a constant mass of 4.256g. Determine the mass of sodium bicarbonate present in the mixture.
February 28, 2010 by Anna

Physics 40
A pendulum bob of mass M1 oscillates with a period of 1.0 s. If the length of the pendulum remains the same, but the pendulum bob is replaced with another one of mass M2 = 2*M1, what is the new period? I need help.
December 7, 2010 by Jennifer

chemistry
MnO2+4HCl-->MnCl2+2H20+Cl2 a. calculate the mass of MnO2 needed to produce 25 g of Cl2 b. what mass of MnCl2 is produced when 0.091 g of Cl2 is generated?
May 28, 2012 by Steph

Physics
If your own mass is 70kg and the mass of a building is 4x 10^6kg and the distance between you and the building is 1m, in comparison to your own weight, estimate the force of attraction between you and the building.
December 8, 2012 by Katie

Chemistry (Help)
Completion (Help) To find the mass of a mole of a compound, scientists add together the __1____ of the atoms making up the compound. When you substitute the unit grams for amu, you obtain the ____2____ of the compound. There are __3____ representative particles in a mole of ...
February 4, 2007 by Bryan

Physics
Two blocks are arranged at the ends of a massless string as shown in the figure. The system starts from rest. When the 3.21 kg mass has fallen through 0.4 m, its downward speed is 1.27 m/s. The acceleration of gravity is 9.8 m/s2 . 3.21 kg (box hanging from table) 4.96 kg (box...
February 20, 2011 by CR

physics
need help with the following question. if earth has a mass of 6.0*10^24 kg and a radius 6.4*10^6 m: a) find the change in gravitational potential energy of a meteorite of mass 150 kg as it moves from an infinite distance to the earth's surface. b) with what speed does the ...
September 24, 2011 by rachel

Physics
Particle A has a mass of 2 and a charge of -1. Particle B has a mass of 2 and a charge of +1. Are particle A and B necessarily antiparticles? Explain your answer.
April 13, 2009 by Linn

chem
Calcium chloride is 36.0% calcium by mass. A 5.00g sample of calcium chloride contains what mass of chlorine?
May 25, 2012 by tenisha

Chemistry
The density of solution of sulfuric acid is 1.29 g/cm3, and it is 38.1% acid by mass. What is the mass, in grams, of 25.0 mL of sulfuric acid?
April 24, 2014 by Natalie

psychology
Neurologists involved in animal research studies of cognitive function see analogies in humans that suggest mental exercise reduces loss of brain mass. Which of the following statements describe their findings? -Older adults who continue complex mental activities can delay or...
October 5, 2009 by ashford university

martin luther king speech "i have a dream"
the counterargument, rebuttal of counterargument, story telling(using personal experiences or the experiences of others in order to appeal to the emotions and/or logic of a targeted audience), appeals to morals or ethics(using language, imagery, personal or observational ...
October 13, 2013 by loli

Physics
A block of mass m1 = 22.0 kg is connected to a block of mass m2 = 40.0 kg by a massless string that passes over a light, frictionless pulley. The 40.0-kg block is connected to a spring that has negligible mass and a force constant of k = 260 N/m as shown in the figure below. ...
March 12, 2013 by Anonymous

physics
lead is a soft, dense metal with a specific heat of 0.028 kcal/kg degrees C, a melting point of 328.0 degrees C and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 250.0 kg sample of lead with a temperature of 20.0 degrees Celsius? q1 = heat to move ...
November 21, 2006 by Erica

Chemistry
Gas X has a density of 2.60/L at STP. Determine the molar of this gas. Please show me the steps to solve this problem. thanks You just need the definition. One mol of a gas at STP occupies 22.4 L. You have the mass of 1 L. Just calculat the mass of 22.4 L. Piece of cake.
March 21, 2007 by michelle

Physics
In lab, a meter stick has its center of gravity at the 45.5 mark. The stick is supported with a meter stick clamp at the 25.0 mrk. A 3.500 kg mass is hung at the 18.2 cm mark to maintain rotational equilibrium. Whats is the calculation of the counterclockwise torque provided ...
April 25, 2011 by Joseph

Physics(Please help)
1) A man (mass = 80.9 kg) jumps straight down from a bridge into a boat (mass = 482 kg) in which a criminal is fleeing. The velocity of the boat is initially +14.5 m/s. What is the velocity of the boat after the man lands in it? would I subtract the two masses and then ...
June 3, 2012 by Hannah

Physics
A uniform solid cylinder of mass M and radius R is at rest on a slab of mass m, which in turn rests on a horizontal, frictionless table. If a horizontal force is applied to the slab, it accelerates and the cylinder rolls without slipping. Find the acceleration of the slab in ...
October 8, 2012 by Amjad

Physics
A man lies on a plank of negligible mass supported by two scales 2.50 m apart. His head rests on the left scale which is also the axis of rotation. If the left scale reads 290 N and the right scale reads 122 N calculate his mass.
November 27, 2012 by Rick

Astronomy
Suppose the Moon is at a (center-to-center) distance D from Earth. Find an exact expression for the magnitude of the tidal force applied by Earth to our rock of mass m in terms of D, m, the mass of Earth Me (input as M_e), and the lunar radius Rm (input as R_m).
December 23, 2012 by sam

physics
A bullet A of mass 2kg travelling at 200m/s emblezes itself in a wooden block of mass 9kg moving in the opposite direction. At 20m/s. Calculate the velocity of the block when the bullet comes to rest inside the block. And what principle is used in the direction
March 18, 2014 by ogboyeb

Physics
A train on a mountain railway is carrying 200 people of average mass 70kg up a slope at an angle of 30 to the horizontal and at a speed of 6.0 m s1. The train itself has a mass of 80 000 kg. The percentage of the power from the engine which is used to raise the passengers ...
June 8, 2014 by Me

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