Friday

April 18, 2014

April 18, 2014

Number of results: 49,058

**Momentum Problem**

A cart of mass m1 = 15 kg slides down a frictionless ramp and is made to collide with a second cart of mass m2 = 23 kg which then heads into a vertical loop of radius 0.21 m. (a) Determine the height h at which cart #1 would need to start from to make sure that cart #2 ...
*Wednesday, November 3, 2010 at 5:39pm by Jessica*

**Physics**

A particle with m = 3.3E-27 kg is moving with a velocity of 6.0E7m/s. It then collides with a stationary particle of mass 2m, the lighter particle then moves at a right angle to the original direction with a velocity of 2.0E7m/s. What is the veloctiy of the heavier particle ...
*Tuesday, February 15, 2011 at 10:53pm by Amnit*

**physics**

A ladder of length 5m has mass of 25 Kg. the ladder is leaned against a frictionless vertical wall at an angle of 10 degrees with the vertical. A repairman with a mass of 82Kg needs to stand on an upper rung of the ladder that is 1m from the end. What is the minimum ...
*Monday, December 12, 2011 at 6:23am by sand*

**Motion equation**

I assume that is 5.5 m/s, the initial velocity. Ok, assuming that, then you know the initial KEnergy; 1/2 .62 (5.5)^2 joules. At the max height, the KE you are given is KE from horizontal motion. So subtract that amount (2.3J) from the initial KE, and you have then the KE that...
*Sunday, December 24, 2006 at 6:54am by Fred*

**physics**

Newton was holding an apple of mass 120 g and thinking about the gravitational forces exerted on the apple by himself and by the Sun. Calculate the magnitude of the gravitational force acting on the apple due to Newton, the Sun, and the Earth, assuming that the distance from ...
*Sunday, October 30, 2011 at 9:09pm by mymi*

**math**

Two blocks sit on a horizontal surface. They are connected to each other by a massless cord. The block on the left has a mass of 5.1 kg and the block on the right has a mass of 3.0 kg. Another massless cord is attached to the block on the right and pulls that block with a ...
*Sunday, September 23, 2012 at 1:52pm by kara*

**Physics**

Two blocks sit on a horizontal surface. They are connected to each other by a massless cord. The block on the left has a mass of 4.8 kg and the block on the right has a mass of 2.2 kg. Another massless cord is attached to the block on the right and pulls that block with a ...
*Monday, February 18, 2013 at 11:55pm by Patrick*

**College Chemistry2**

Look up normal freezing point benzene. Look up freezing point constant for benzene (Kf = ?). delta T = Kf*molality Solve for molality. molality = moles/kg solvent Solve for moles moles = grams/molar mass Solve for molar mass. Find the mass of the empirical formula. (molar mass...
*Saturday, February 5, 2011 at 11:31pm by DrBob222*

**chem**

The heat of combustion of bituminous coal is 2.50 × 104 J/g. What quantity of the coal is required to produce the energy to convert 137.7 pounds of ice at 0.00°C to steam at 100.°C? specific heat (ice) = 2.10 J/g°C specific heat (water) = 4.18 J/g°C heat of fusion = 333 J/g ...
*Wednesday, December 15, 2010 at 11:37am by Bogdanam*

**chemistry**

Here is a quick rundown of the way I think it should be done: If the weight is 4590 N, m = W/g, or m = 4590 N / 9.8 kg/N = 468.4 kg d = 468.4 kg / 0.500 m^3 = 937 kg/m^3 1 m^3 = 1000 dm^3 0.500 m^3 = 500 dm^3 d = 468.4 kg / 500 dm^3 = 0.937 kg/dm^3 It can be shown that a ...
*Tuesday, September 22, 2009 at 7:07pm by GK*

**Math **

Cashew nuts sell for $21.00/kg. Brazil nuts sell for $15.00/kg. a distributed sold at total of 120kg of cashew and Brazil nuts for 2244 dollars. What mass of each type of nut was sold?
*Tuesday, June 18, 2013 at 12:55pm by Anonymous*

**chemistry**

M = mols/L, then 1.19 g/mL x 1000 mL x 0.37 x (1 mol/molar mass HCl) = M = approximately 12M m = mols/kg solvent. How many grams of the solution do you have above? You know that's 1.19 x 1000 = g soln. How many grams HCl are there? That's g soln x 0.37 How many grams water (...
*Monday, January 21, 2013 at 9:56am by DrBob222*

**Physics**

A car moving at 8 m/s crashes into a barrier and stops in 0.050 s. There is a 19-kg child in the car. Assume that the child's velocity is changed by the same amount as that of the car, and in the same time period. (a) What is the impulse needed to stop the child in N*s?(b) ...
*Sunday, November 21, 2010 at 5:18pm by Preston*

**Math**

A quart is 32 fluid ounces. (A fluid ounce is a unit of volume, not mass or weight). So subtract 25 fl oz. and 42 fl oz. from 96 and you get 29 fl oz. = 1 pint 13 fl oz. You are right on that one. 19.5 million tons x 1000 kg/ton = 19.5 billion kg
*Wednesday, May 21, 2008 at 4:39pm by drwls*

**physics**

A mine car, mass= 440 kg rolls at a speed of 0.50 m/s on a horizontal track. A 150-kg chunk of coal has a speed of 0.80 m/s when it leaves the chute. The chunk of coal falls into the car at a 25 degree angle. Determine the velocity of the car/coal system after the coal has ...
*Friday, November 28, 2008 at 2:30am by Sandhya*

**Physics**

Hunting a black hole. Observations of the light from a certain star indicate that it is part of a binary (two-star) system. This visible star has orbital speed v = 270 km/s, orbital period T = 1.6 days, and approximate mass m1 = 6.0Ms, where Ms is the Sun's mass, 1.99 x 1030 ...
*Sunday, January 2, 2011 at 10:27pm by kelly*

**physics**

1.what is the final velocity of a hoop that rolls with out slipping down a 3.00m high hill starting at rest? 2. a 1.80 m radius playground merry go round (disk = 1/2 m r^2) hass a mass of 120 kg and is rotating with an angular velocity of .600 rev/s. what is the angular ...
*Monday, October 21, 2013 at 8:59am by Sara*

**Phys. pendulum**

A pendulum consists of a mass of 3 kg tied to the end of a string of length 1.5 m. The pendulum is initially held at angle of 45o with the vertical and the pendulum is released. At the instant the mass passes through its lowest position it is 2 m above the ground and the ...
*Thursday, October 9, 2008 at 12:26pm by KimK*

**physics 1 please help!**

A man seeking to set a world record wants to tow a 106000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 77 kg, and the coefficient of static friction between his shoes and the runway is 0.99. What is the greatest...
*Thursday, February 10, 2011 at 7:07pm by Hannah*

**physics 1 please help!**

A man seeking to set a world record wants to tow a 106000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 77 kg, and the coefficient of static friction between his shoes and the runway is 0.99. What is the greatest...
*Thursday, February 10, 2011 at 7:06pm by Hannah*

**Physics(Please respond)**

1) David has a mass of 86.4-kg and is skating with in-line skates. He sees his 24.8-kg younger brother up ahead standing on the sidewalk, with his back turned. Coming up from behind, he grabs his brother and rolls off at a speed of 2.99 m/s. Ignoring friction, find david's ...
*Sunday, June 3, 2012 at 1:34pm by Hannah*

**science**

A man seeking to set a world record wants to tow a 106,000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 77 kg, and the coefficient of static friction between his shoes and the runway is 0.82. What is the ...
*Friday, October 4, 2013 at 5:15pm by Donna*

**physics**

A man seeking to set a world record wants to tow a 104,000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 93 kg, and the coefficient of static friction between his shoes and the runway is 0.78. What is the ...
*Sunday, November 17, 2013 at 5:59pm by Hanna*

**Science**

http://web2.airmail.net/uthman/elements_of_body.html I checked at the above site and it shows a 70 kg person having 43 kg oxygen 16 kg carbon 7 kg hydrogen 1.8 kg nitrogen total C,O, H, N = 67.8 kg and (67.8/70]*100 =96.9% You may want to check my figures and my calculation.
*Monday, September 8, 2008 at 7:12pm by DrBob222*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

A merry-go-round (pictured) is sitting in a playground. It is free to rotate, but is currently stationary. You can model it as a uniform disk of mass 210 kg and radius 110 cm (consider the metal poles to have a negligible mass compared to the merry-go-round). The poles near ...
*Sunday, December 8, 2013 at 7:14am by Anonimus*

**Physics**

A 0.5 kg mass is moving in a circle of radius 1.8 m on a flat frictionless table at the end of a string. The speed of the mass is 2.6 m/s. The string routes through a hole in the center of the table and is held by you underneath the table. A.) What is the angular momentum of ...
*Friday, June 7, 2013 at 3:46pm by Dusty*

**physics **

A 0.5 kg mass is moving in a circle of radius 1.8 m on a flat frictionless table at the end of a string. The speed of the mass is 2.6 m/s. The string routes through a hole in the center of the table and is held by you underneath the table. What is the angular momentum of the ...
*Friday, June 7, 2013 at 3:43pm by Anonymous*

**physcis**

A beam resting on two pivots has a length of L = 9.00 m and mass M =81.0 kg. The pivot under the left end exerts a normal force n1 on the beam, and the second pivot placed a distance 4.00 m from the left end exerts a normal force n2. A woman of mass m= 43.0 kg steps onto the ...
*Sunday, November 11, 2012 at 4:53pm by Anonymous*

**physics**

The cable tension will increase to T = M(g+a) when the elevator is slowing down at deceleration rate a. You can get a from the relation V^2/2 = a X where X is the stopping distance, and V is the initial velocity.
*Thursday, October 7, 2010 at 4:06pm by drwls*

**Physics**

An elevator is moving upward at 0.97 m/s when it experiences an acceleration 0.34 m/s 2 downward, over a distance of 0.80 m. What will its final velocity be?
*Monday, September 3, 2012 at 4:36pm by Dakota*

**physical sciences**

Suppose the ceiling in the previous problem is that of an elevator which is going up with an acceleration of 2.0 m/s square. Find the the elongations.
*Thursday, January 16, 2014 at 2:22pm by md hashim*

**chem**

You can use the percents to determine the empirical formula. Take 100 g sample which will give you 40.3 g C, 52.2 g N and 7.5 g H. Now divide each by the atomic mass of C, N, and H respectively, find the ratio in small whole numbers and you have the empirical formula. Now use ...
*Friday, November 7, 2008 at 3:27pm by DrBob222*

**chemistry**

molality depends on mass of solute and mass of the solvent. molality=masssolute/(molmasssolute*kgsolvent) so to solve for molmasssolute, you need to know molality, masssolute, and the kg of solvent.
*Saturday, January 31, 2009 at 8:07pm by bobpursley*

**physical science**

A smoke particle undergoing Brownian motion in air has a mass of 2.00 x 10 -5 kg. a) what is the its average velocity if the temperature is 300 K? b) what is its average kinetic energy? The average kinetic energy of a particle or molecule of any mass is Eav = (3/2) k T where k...
*Friday, June 22, 2007 at 8:27pm by jan*

**Math (dont want the ans just the working)**

4kg of apples costing 80 cents per kg are mixed with 8 kg costing 56 cents per kg.What is the average price per kg?
*Monday, July 20, 2009 at 1:44pm by keisha*

**Physics**

10^3 * time in seconds t = Joules in so 10^3 t = 2 kg*2000 J/(kg deg)*(20 deg) + 2 kg (334*10^3 J/kg) 10^3 t = 80* 10^3 J + 668 *10^3 J t = 748 s or about 12.5 minutes
*Saturday, November 17, 2012 at 7:00pm by Damon*

**Physics Measurements**

Divide the mass (1000 kg) by the density to get the volume of a rock. Assume the density is three times that of water. You can assume the rock is a sphere or cube to get the approximate dimension from the volume. The density of water is 1000 kg/m^3
*Tuesday, August 11, 2009 at 3:03am by drwls*

**Chemistry**

Look up the density of hexane and chloroform. Use the density to convert 6287 mL hexane to grams. Then moles hexane = grams/molar mass. m = moles hexane/kg CHCl3. You know m and you know moles, calculate kg CHCl3.
*Tuesday, March 2, 2010 at 10:52pm by DrBob222*

**Phizzics....**

(a) F=G•m•M/(R+h)², where the gravitational constant G =6.67•10^-11, Earth’s mass is M = 5.97•10^24 kg, Earth’s radius is R = 6.378•10^6 m. h =8.2•10^5 m, m = 52 kg. (b) m•a = m•v²/(R+h) = G•m•M/(R+h)². v =sqrt [G•M/(R+h)] T =2•π• (R+h)/v = =2•π•(R+h)/...
*Tuesday, May 15, 2012 at 7:29pm by Elena*

**science**

A new moon is discovered orbiting Neptune with an orbital speed of 9.3 ´ 10 m/s. Neptune’s mass is 1.0 ´ 10 kg. What is the radius of the new moon’s orbit? What is the orbital period? Assume that the orbit is circular. (G = 6.673 ´ 10 N·m/kg)
*Monday, March 3, 2014 at 11:19am by paul*

**physics**

Estimate the speed of the parachutist descending at the constant velocity with open parachute. Assume the area of the parachute, A = 30 m^2, mass of a person, m = 100 kg, and density of air, roh = 1 kg/m^3. Enter the answer limited to the second decimal place. Hint 1: air ...
*Monday, February 21, 2011 at 11:33am by Anonymous*

**physics**

A lazy Susan consists of a heavy plastic disk mounted on a frictionless bearing resting on a vertical shaft through its center. The cylinder has a radius R = 10 cm and mass M = 0.24 kg. A cockroach (mass m = 0.015 kg) is on the lazy Susan, at a distance of 10 cm from the ...
*Tuesday, May 22, 2012 at 10:14pm by marcel*

**chemistry**

"Newton's law tells us that Force= Mass x Acceleration. We also know that Energy = Force x Distance and Pressure= Force/Area. Using these relationships and table I-1 [I'll type it out], derive (do math stuff) the dimensions of newtons, joules, and pascals in terms of the ...
*Wednesday, September 13, 2006 at 5:52pm by Jenn*

**chemistry PLEASE HELP**

volume of can = 2.00ft x 3.00 ft x 0.500ft = ?ft^3. mass = volume x density Substitute volume from above and density of 62.4 lbs/ft^3 to obtain mass in pounds. Then convert pounds to grams and kg.
*Tuesday, September 27, 2011 at 3:14pm by DrBob222*

**Chemistry**

delta T = Kb*m Calculate m m = moles/kg solvent. Calculate moles moles = grams/molar mass Calculate molar mass.
*Tuesday, June 8, 2010 at 6:55pm by DrBob222*

**chemistry**

delta T = Kf*m Solve for m m = moles/kg solvent Solve for moles moles = grams/molar mass Solve for molar mass.
*Sunday, July 17, 2011 at 1:13am by DrBob222*

**chemistry**

delta T = Kf*m Solve for m m = moles/kg solvent Solve for moles. moles = grams/molar mass Solve for molar mass.
*Monday, December 12, 2011 at 5:10pm by DrBob222*

**Chemistry**

delta T = Kf*m Solve for m m = moles/kg solvent solve for moles moles = grams/molar mass solve for molar mass.
*Friday, February 17, 2012 at 10:46am by DrBob222*

**Chem**

delta T = Kf*m Solve for m. m = mols/kg solvent solve for mols. mols = grams/molar mass Solve for molar mass.
*Wednesday, May 2, 2012 at 2:35am by DrBob222*

**chemistry**

delta T = Kf*m Solve for m m = mols/kg solvent Solve for mols mols = grams/molar mass Solve for molar mass.
*Thursday, October 4, 2012 at 11:23pm by DrBob222*

**physics**

Car 1 approaches an intersection with a momentum of p1i=(11,000 kg*m/s)x + (-370 kg*m/s)y. Car 2 approaches the same intersection with momentum p2i= (4,000 kg*m/s)x + (2470 kg*m/s)y. The cars collide and immediately the momentum of Car2 is p2f= (2100 kg*m/s)y. What is the ...
*Wednesday, October 13, 2010 at 11:06pm by Anonymous*

**Physics**

A flat uniform circular disk (radius = 2.10 m, mass = 1.00 102 kg) is initially stationary. The disk is free to rotate in the horizontal plane about a frictionless axis perpendicular to the center of the disk. A 40.0-kg person, standing 1.00 m from the axis, begins to run on ...
*Thursday, November 4, 2010 at 12:02am by Kevin*

**Physics**

A shipwrecked mariner is stranded on a desert island. He seals a plea for rescue in a 1.00 liter bottle, corks it up, and throws it into the sea. If the mass of the bottle, plus the message and the air inside, is 0.454 kg, what percentage of the volume of the bottle is ...
*Sunday, June 17, 2012 at 6:28pm by Jamie*

**physics**

A man with a mass of 62 kg skis down a frictionless hill that is h = 3.3 m high. At the bottom of the hill the terrain levels out. As the man reaches the horizontal section, he grabs a 20-kg backpack and skis off a 2.0-m-high ledge. At what horizontal distance from the edge of...
*Thursday, March 1, 2012 at 11:20am by trisha*

**physics**

A man with a mass of 62 kg skis down a frictionless hill that is h = 3.3 m high. At the bottom of the hill the terrain levels out. As the man reaches the horizontal section, he grabs a 20-kg backpack and skis off a 2.0-m-high ledge. At what horizontal distance from the edge of...
*Thursday, March 1, 2012 at 11:25am by trisha*

**Physics**

A man with a mass of 60 kg skis down a frictionless hill that is h = 2.2 m high. At the bottom of the hill the terrain levels out. As the man reaches the horizontal section, he grabs a 20-kg backpack and skis off a 2.0-m-high ledge. At what horizontal distance from the edge of...
*Sunday, March 4, 2012 at 11:23pm by Ray*

**chemistry**

You have 14g water. 190/100=mass/14 solve for mass smmonium nitrate. product mass= (14g+massabove)/.35 Your use of weight and mass is rather loose. weight is not mass, and mass is not weight.
*Saturday, February 19, 2011 at 10:58am by bobpursley*

**chemistry**

density = 1.20 g/mL so 1000 mL has a mass of 1.20 x 1000 = 1200 grams How much of that is H3PO4? 34.0%. 1200 x 0.34 = 408 g. How many moles is that? 408/98 = 4 something. You do it exactly. That is 4 something moles in 1 L so Molarity = 4 something. Molality: 1000 mL has a ...
*Tuesday, February 16, 2010 at 11:48pm by DrBob222*

**Physics**

A force of 20 N is applied horizontally to a 1 kg mass on a level surface. The coefficient of friction is .2. if the mass is moved a distance of 5m what is the change in KE? W= change in Ke Fd= Change in KE (20)(5)=Change in Ke 200 J =change in Ke But the thing is how would I ...
*Wednesday, October 17, 2007 at 6:02pm by Andrea*

**Dimensional analysis**

g/day µg/kg kg day/mg 1/kg = µg*g/mg *(1/kg) = 10^(-6)
*Monday, November 19, 2007 at 9:57am by Count Iblis*

**Chemistry**

(C*9/5)+32 = F 44 lbs x (2.2 kg/lb) = 20 kg. 30 mg/kg = 30 mg x 20 kg = 600 mg daily Divide that into two doses.
*Sunday, August 7, 2011 at 12:55pm by DrBob222*

**thermodynamics**

(A) Since the water vapor and water are at equilibrium, the water vapor pressure is a function of the temperature (and vice versa). 5.00*10^5 N/m^2 is 4.94 atm. The temperature at that water vapor pressure is 151.8 C. You can obtain that from tables of H2O saturation pressure ...
*Saturday, January 8, 2011 at 5:00pm by drwls*

**Physics**

A playground merry-go-round (which can be modeled as a disk) has a 3.4 m diameter, a mass of 240 kg and is rotating at 22.5 rpm. A 35 kg child running at 6.0 m/s, tangent to and in the same direction as the merry-go-round is turning, jumps on the outer edge. Ignoring any ...
*Wednesday, November 16, 2011 at 11:52pm by Anonymous*

**Physics**

Box, mass m 1 , at rest against a compressed spring, spring constant k and compression of Δx, at the top of a ramp, height h, is released. It slides down the ramp, angle θ, with friction, coefficient μ. Half way down the ramp, it bumps into and sticks to another...
*Thursday, August 9, 2012 at 10:48am by Chad*

**physics**

Pretty silly question. The official mass of a major league baseball is 0.145 kg. No pitcher has ever thrown a baseball 200 km/h. Not even Sandy Koufax. You can derive a baseballmass from the numbers you were given by equating the kinetic energy of the baseball to the work done...
*Friday, November 27, 2009 at 10:33pm by drwls*

**physics**

1.A roller coaster is towed up an incline at a steady speed of 0.500 m/s by a chain parallel to the surface of the incline. The slope is 3.12 %, which means that the elevation increases by 3.12 m for every 100 m of horizontal distance. The mass of the roller coaster is 415 kg...
*Sunday, September 28, 2008 at 6:10am by Sandhya*

**physics HELPP!!!!!!!**

Two astronaut, as shown in the figure, each having a mass of 88.0 kg, are connected by a 10.00 m rope of negligible mass. They are isolated in space, moving in circles around the point halfway between them at a speed of 6.00 m/s. By pulling on the rope, the astronauts shorten...
*Wednesday, November 14, 2012 at 4:44pm by anon*

**Physics- LOST!**

Convert 500 watts to joules/sec. That is 500 J/sec. The problem states about 80% is converted to heat so 500 J/sec x 0.8 = ?? heat produced in 1 sec. How many J is that per hour. 500 J/sec x (60 sec/min) x (60 min/hour) = ?? J/hour. Then q = mass H2O in kg x heat of vap of ...
*Monday, December 3, 2007 at 12:30pm by DrBob222*

**Physics**

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 92.5 kg. The mass of the rock is 0.310 kg. Initially the wagon is rolling forward at a speed of 0.550 m/s. ...
*Monday, October 22, 2012 at 8:40pm by Elizabeth*

**Physics**

A ramp, a pulley, and two boxes. Box A, of mass 10.0 kg, rests on a surface inclined at 37° to the horizontal. It is connected by a lightweight cord, which passes over a massless and frictionless pulley, to a second box B, which hangs freely as shown. If the coefficient of ...
*Sunday, April 10, 2011 at 1:01pm by Liz*

**physics**

A string going over a massless frictionless pulley connects two blocks of masses 4.4 kg and 11 kg. As shown on the picture below, the 4.4 kg block lies on a 23◦ incline; the coefficient of kinetic friction between the block and the incline is μ = 0.29. The 11 kg ...
*Thursday, March 6, 2014 at 1:24pm by Sarah*

**Statistics**

Total plasma volume is important in determining the required plasma component in blood replacement theory for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that sample of 50 male firefighters are ...
*Thursday, June 24, 2010 at 3:49pm by stan*

**Statistics**

Total plasma volume is important in determining the required plasma component in blood replacement theory for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that sample of 50 male firefighters are ...
*Friday, June 25, 2010 at 9:37am by stan*

**Physics Classical Mechanics**

A railroad gun of mass M = 2.0 kg fires a shell of mass m=1.0 kg at an angle of θ= 40.0 ∘ with respect to the horizontal as measured relative to the gun. After the firing is complete, the final speed of the projectile relative to the gun (muzzle velocity) is v0=110....
*Monday, October 28, 2013 at 6:14am by Anonymous*

**Chemistry**

40% means 40 g ethylene glycol/100 g solution. 40 g to moles = 40/molar mass. Use density to convert 100 g soln to volume, then M = moles/L. Convert % to m 40g/100 g = 40g glycol/(40g glycol + 60 g water). Convert 40 g glycol to moles. Convert 60 g water to kg. m = moles/kg ...
*Friday, January 21, 2011 at 11:33am by DrBob222*

**physics**

For human body c=3470 J/kg. At 37.0ºC the heat of vaporization Lv for water is 2430 kJ/kg or 580 kcal/kg m•c•Δt= m(cond) •L(v) m(cond) = m•c•Δt/L(v) = =60•3470•0.75/2430000 =6.43•10⁻² kg=64.3 g
*Sunday, July 21, 2013 at 3:02am by Elena*

**Classical Mechanics Physics**

A merry-go-round (pictured) is sitting in a playground. It is free to rotate, but is currently stationary. You can model it as a uniform disk of mass 210 kg and radius 110 cm (consider the metal poles to have a negligible mass compared to the merry-go-round). The poles near ...
*Friday, December 6, 2013 at 3:39pm by Anonymous*

**Thermodynamics of steam**

A boiler furnace releases 10000.000kJ of heat for each kg of fuel burned and produces dry saturated steam at 10000.000kPa from feed water at 190.000 degrees Celsius. How many kg of steam will be produced for each kg of fuel burned if the boiler had an efficiency of 69%. ANS = ...
*Monday, July 22, 2013 at 9:07pm by Danny*

**physics**

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...
*Thursday, June 7, 2012 at 11:13pm by Akbar*

**physics**

A mass m = 88.0 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius R = 15.8 m and finally a flat straight section at the same height as the center of the loop (15.8 m off the ground). Since the mass would not make it around the loop if ...
*Tuesday, February 12, 2013 at 9:37pm by peter*

**math**

W=kd Use the first set of data to find k, k=W/d Then, use that k to find the second distance... distance= k * w I know you are in a math class, and the teacher probably doesn't know, but kg is not a unit of weight, but of mass. Mass only has weight under the influence of ...
*Wednesday, July 28, 2010 at 2:41pm by bobpursley*

**College Chemistry**

I did both problems and these are my results: 1) Molality concentration= -.161 kg/mol 8.1g--> .0081 kg mols solute: (-.161kg/mol)(.0081kg)= -.0013 mol then, -.0013 mol H2O(18.016 g H2O)= -.0234 g H2O solute 2) HNO3= 16 mols/l density= 1420 g 16 mols HNO3(63.015)= 1008.2 g ...
*Monday, May 17, 2010 at 6:42pm by Sarah*

**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?
*Monday, February 21, 2011 at 3:51pm by Paige*

**Physics !!!!! HELP PLEASE**

K.E. is (1/2) M V^2 To get it in Joules, M must be in kg. bullet KE = 960 Joules If motorcycle KE = 960 J,and its mass is 173 kg, (1/2)*173*Vm^2 = 960 then the motorcycle velocity is Vm = 3.33 m/s Convert that to km/h
*Wednesday, May 22, 2013 at 10:06pm by drwls*

**physics**

A sports car of mass 950 kg (including the driver) crosses the rounded top of a hill (r = 88 m) at 27 m/s. Determine the normal force exerted by the road on the car. Determine the normal force exerted by the car on the 72-kg driver. Express your answer using two significant ...
*Monday, October 11, 2010 at 11:14am by elizabeth*

**physics**

Kinetic energy that the elevator has when it hits the spring is: KE = m*g*h-work done by friction so far the work done by friction so far =18158*h where m = 5320 kg g = 9.81 m/s^2 h - 31.6 m Now we compress the spring a distance x Work done by gravity in falling additional ...
*Friday, March 7, 2008 at 4:18pm by Damon*

**physics**

A pendulum and a mass spring system are both undergoing simple harmonic motion on Earth (use g = 10 N/kg). It is observed that every time the pendulum goes back and forth, the spring has gone up and down 14 times. If the pendulum has a length of 5 meters and the mass is 100 g...
*Monday, December 31, 2012 at 6:29pm by sunny*

**Physics**

A pendulum and a mass spring system are both undergoing simple harmonic motion on Earth (use g = 10 N/kg). It is observed that every time the pendulum goes back and forth, the spring has gone up and down 12 times. If the pendulum has a length of 4 meters and the mass is 100 g...
*Sunday, January 20, 2013 at 11:35pm by Anthony*

**Physics**

A massless spring, with K=425 N/m, is hung vertically with the bottom end of the spring at position Y.i. A 3.50 kg mass is attached to the bottom of the spring and allowed to fall and oscillate. A) How far below Y.i does the mass fall before coming momentarily to rest and ...
*Wednesday, May 1, 2013 at 9:41pm by J*

**Physics **

A satellite moves in a circular orbit around the Earth at a speed of 5.4 km/s. Determine the satellite’s altitude above the surface of the Earth. Assume the Earth is a homogeneous sphere of radius 6370 km and mass 5.98 × 10 24 kg. The value of the universal gravitational ...
*Sunday, January 13, 2013 at 10:20pm by Emily*

**physics**

ok so I really don't get 2d collisions and I thought I knew how to do this one but I have no idea: A 104 kg baseball player jumps up verticlly to catch a baseball of mass .254 kg traveling horizontally with a speed of 28.6 m/s. If the vertical speed of the player is .258 m/s ...
*Sunday, December 16, 2007 at 12:07pm by Ty*

**physics**

ok so I really don't get 2d collisions and I thought I knew how to do this one but I have no idea: A 104 kg baseball player jumps up verticlly to catch a baseball of mass .254 kg traveling horizontally with a speed of 28.6 m/s. If the vertical speed of the player is .258 m/s ...
*Sunday, December 16, 2007 at 12:09pm by Ty*

**CHEMiSTRY PLEASE HELP**

What is the mass of 4.2 kg of gold when it is transferred to a planet having twice the gravity of earth?
*Sunday, September 27, 2009 at 7:13pm by Jess*

**physics 8th grade**

If a woman hasa mass of 50 kg calculate her weight in neutons
*Wednesday, October 28, 2009 at 7:48pm by jim*

**physical science **

If the larger boulder has a mass of 50 kg and a height of 150 m from the ground what is its GPE?
*Monday, December 7, 2009 at 9:57am by lexie*

**physical science **

If the larger boulder has a mass of 50 kg and a height of 150 m from the ground what is its GPE?
*Monday, December 7, 2009 at 9:57am by lexie*

**physics**

Determine the net force necessary to give an object with a mass of 1.8 kg an acceleration of 5.7 m/s2.
*Saturday, March 20, 2010 at 11:00pm by Michelle*

**chem**

Use the de Broglie equation, wavelength = h/mv mass in kg, v in m/s, h is Planck's constant.
*Thursday, April 29, 2010 at 10:25pm by DrBob222*

**chemistry**

2.48 x 10-3 eV What would be the rest mass of a particle with that energy (in kg units)?
*Thursday, September 9, 2010 at 1:07am by Anonymous*

**physics**

What is the average density of Mars? Mass = 6.42 x1023 kg, radius = 3390 km.
*Thursday, September 30, 2010 at 11:39am by angela*

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