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April 16, 2014

Search: "A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. "

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Are any tutors helping with Physics tonight? Help!
A cart of mass M1 = 6.00 kg and initial speed = 4.00 m/s collides head on with a second cart of mass M2 = 4.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision.
Tuesday, February 15, 2011 at 10:16pm by Megan

Are their any Physics tutors on here tonight?!
A cart of mass M1 = 6.00 kg and initial speed = 4.00 m/s collides head on with a second cart of mass M2 = 4.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision.
Tuesday, February 15, 2011 at 10:39pm by Megan

science
A cylindrical bottle of oil-and-vinegar salad dressing whose volume is 1/3 vinegar (p=1.01 g/cm^3) and 2/3 oil (p=.910 g/cm^3) is at rest on a table. Initially the oil and the vinegar are separated, with the oil floating on top of the vinegar. The bottle is shaken so that the ...
Tuesday, March 29, 2011 at 5:15pm by Jacob

chemistry
Find the atomic mass number of W. THen multipy that by the mass of a neutron (proton is about the same). Then divide that into .0176grams. You may have to change units, depending on the mass units for the W atom.
Monday, February 1, 2010 at 5:20pm by bobpursley

Physics
A cart traveling at 0.3 m/s collides with stationary object. After the collision, the cart rebounds in the opposite direction. The same cart again traveling at 0.3 m/s collides with a different stationary object. This time the cart is at rest after the collision. In which ...
Monday, February 27, 2012 at 11:38pm by Mark

Physics
When a 226/88 Ra nucleus decays by emitting an alpha particle, what is the atomic number of the resulting nucleus? What is the resulting atomic mass?
Thursday, April 17, 2008 at 8:23pm by Chad

physics-mechanics-collisions,momentum, impulse
You are at the controls of a particle accelerator, sending a beam of 2.40107 protons (mass ) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one of the nuclei of the unknown element. All such protons...
Saturday, October 27, 2012 at 5:05am by HANNE

Chemistry
1.a radioscope which is neutron poor and very heavy is most likely to decay by? alpha , beta, electron capture, positron emission 2. When a 235-U nucleus is struck by a thermal neutron, fission occurs often with the release of neutrons. If fission fragments are 89-Sr and 144-...
Friday, April 27, 2007 at 3:07pm by keith

chemistry
A lithium nucleus has three protons and three neutrons. How many electrons would it take to equal the mass of a lithium nucleus?
Monday, September 20, 2010 at 12:06pm by blahh

physics
In the figure, block 1 of mass m1 slides from rest along a frictionless ramp from height h = 2.8 m and then collides with stationary block 2, which has mass m2 = 2m1. After the collision, block 2 slides into a region where the coefficient of kinetic friction μk is 0.3 and...
Wednesday, November 13, 2013 at 4:38pm by kristy

Physics
The boiling point of helium at 1 atm is 4.2 K. What is the volume occupied by helium gas due to evaporation of 70 g of liquid helium at 1 atm pressure and a temperature of 6.2 K?
Friday, February 24, 2012 at 4:36pm by Gabe

Physics
An 67.6 kg object moving to the right at 38.7 cm/s overtakes and collides elastically with a second 48.9 kg object moving in the same direction at 19.2 cm/s. Find the velocity of the second object after the collision. Answer in units of cm/s
Tuesday, March 5, 2013 at 3:03pm by help

physics
One end of a massless coil spring is suspended from a rigid ceiling. It is found that when a 4 kg mass is suspended from it the spring stretches 90 mm when the mass comes to rest. (a) What is the spring constant for the spring B)If the mass is then pulled down an additional ...
Monday, October 31, 2011 at 3:34pm by Andrea

physics
One end of a massless coil spring is suspended from a rigid ceiling. It is found that when a 3.3 kg mass is suspended from it the spring stretches 105 mm when the mass comes to rest. (a) What is the spring constant for the spring? (b) If the mass is then pulled down an ...
Tuesday, November 1, 2011 at 7:05pm by Austin

Physics
In the figure below, a 3.7 kg box of running shoes slides on a horizontal frictionless table and collides with a 2.0 kg box of ballet slippers initially at rest on the edge of the table, at height h = 6.9 m. The speed of the 3.7 kg box is 5.0 m/s just before the collision. If ...
Wednesday, March 5, 2014 at 4:31pm by Anonymous

Physics
A cart of mass M1 = 4.00 kg and initial speed = 4.00 m/s collides head on with a second cart of mass M2 = 2.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision. i keep getting the wrong answer please help me.I dont know what equation...
Thursday, March 6, 2008 at 7:56am by josh g

Physics
The density of air near the earth's surface is 1.29 kg?m^3. If a helium balloon with a mass of 1 kg floats in air without rising or falling,what is the minimum volume of helium in the balloon? (presume that the mass of the material making up the balloon is negligible). I am ...
Thursday, February 16, 2012 at 9:37pm by Jonathon

Physics
Outside the International Sapce Station, a 60 kg astronaut holding a 4.0 kg object (both initially at rest) throws the object at 10 m/s relative to the space station. A 50 kg astronaut, initially at rest, catches the object. What is the speed of the separation of the two ...
Thursday, June 18, 2009 at 1:59am by Rio

Physics
A 26.0 g object moving to the right at 17.0 cm/s overtakes and collides elastically with a 10.0 g object moving in the same direction at 15.0 cm/s. Find the velocity of each object after the collision. a) 26.0 g object b) 10.0 g object
Friday, July 16, 2010 at 1:09am by Daisy

Physics
An 67.6 kg object moving to the right at 38.7 cm/s overtakes and collides elastically with a second 48.9 kg object moving in the same direction at 19.2 cm/s. Find the velocity of the second object after the collision. Answer in units of cm/s
Tuesday, February 26, 2013 at 7:53pm by colby

science
D is not right. Electrons move all the time around the nucleus. The travels are not in the nucleus, but they travel around. There are different theories one is that they are in orbitals like the planets around the earth. Really there is cloud of electrons moving around the ...
Wednesday, March 13, 2013 at 10:37am by Dr. Jane

physics
Two pucks collide on an air hockey table. Puck A has a mass of 17.0 g and is initially traveling in the +x direction at 7.00 m/s. Puck B has a mass of 51.0 g and is initially at rest. After the pucks collide, puck A moves away at an angle of 52.0 deg above the +x axis, while ...
Monday, March 24, 2014 at 9:47am by Tsion

Physics
A crate with a total mass of 50 kg is initially at rest on a level floor.What is the weight of the crate?
Wednesday, June 22, 2011 at 11:36am by Shyanne

Physics Problems
Will check my work and help me with the last two problems please? A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed? -(12 kg/m/s) / 4kg=3m/s A ball is moving at 4 m/s and has a momentum of 48 kg m/s. What is the ball's mass? -(48kg/m/s) / (4m/s) =12 kg A 1-kg ...
Saturday, October 13, 2007 at 9:53pm by Soly

I need help with Physics
A baseball of mass m1 = 0.46 kg is thrown at a concrete block m2 = 8.25 kg. The block has a coefficient of static friction of μs = 0.81 between it and the floor. The ball is in contact with the block for t = 0.165 s while it collides elastically. m1 = 0.46 kg m2 = 8.25 ...
Wednesday, March 26, 2014 at 1:18pm by Maura

Math
How many cubic units are in the volume of a cylinder whose height is four units and whose radius is five units? What is the surface area of a cube whose volume is 27 cubic inches?
Thursday, November 11, 2010 at 9:05pm by Nika

Physics
A hanging mass, M1 = 0.78 kg, is attached by a light string that runs over a frictionless pulley to a mass M2 = 1.48 kg that is initially at rest on a frictionless table. Find the magnitude of the acceleration, a, of M2 in m/s^2.
Thursday, May 24, 2012 at 11:57am by James

Physics
Can you show work please..? 1. Joe is sledding down a snow hill when he collides with Mike half way down the hill. Joe and the sled have a mass of 65 kg and their velocity before the collision was 12 m/s. If Mike has a mass of 55 kg, what velocity would Joe, Mike, and the sled...
Sunday, January 16, 2011 at 9:55pm by Amy

Physics
Thanks for taking a look! A baseball of mass m1 = 0.46 kg is thrown at a concrete block m2 = 8.25 kg. The block has a coefficient of static friction of μs = 0.81 between it and the floor. The ball is in contact with the block for t = 0.165 s while it collides elastically...
Tuesday, March 25, 2014 at 10:32pm by Michelle

Chemistry
I recently performed an experiment in which magnesium oxide formed. I have to find out the simplest whole number ratio of Mg atoms to O atoms. How do I go about doing this? * Chemistry - DrBob222, Tuesday, October 13, 2009 at 11:19pm Mass MgO - mass Mg initially = mass oxygen ...
Wednesday, October 14, 2009 at 3:31pm by Anonymous

Physics
a 10,000kg boxcar rolling west at 60mph collides with an empty tanker of mass 7000kg sitting at rest on the track. The cars attach and continue to roll west on the track. What is the speed of the connected cars?
Thursday, April 26, 2012 at 10:23pm by Sarah

physics
2 masses are connected through a non-stretchable string that passes over a frictionless pulley. The masses of the objects are 12 kg and 5.5 kg respectively. The obj with larger mass is hanging 2.5 m fr the surface of a table. Suppose that the two objs are initially at rest. (a...
Sunday, January 15, 2012 at 9:39am by Sha

Physical Science
An aluminum nucleus has 13 protons and 14 neutrons. A copper nucleus has 29 protons and 34 neutrons. What is the force of repulsion between an aluminum nucleus and a copper nucleus when they are separated by 1.2 nm?
Saturday, March 26, 2011 at 12:39pm by Avery

physics
In Figure block 1 of mass m1 slides from rest along a frictionless ramp from height h = 3.10 m and then collides with stationary block 2, which has mass m2 = 5.00m1. After the collision, block 2 slides into a region where the coefficient of kinetic friction μk is 0.550 ...
Wednesday, February 27, 2008 at 11:06pm by gia

Physics
Some kid (mass 20 kg) jumps with a velocity of 3.2 m/s horizontally off some steps (height 0.55 m) onto his heavy duty skateboard (mass 3 kg, height 0.03 m), which is initially at rest. How fast will he be skating?
Friday, October 22, 2010 at 5:55pm by Sam

chemistry hw please help
I have no clue how to figure this problem out.. The Goodyear blimps, which frequently fly over sporting events, hold approximately 1.90105 ft^3 of helium. If the gas is at 24 degrees Celsius and 1.0 atm, what mass of helium is in the blimp?
Tuesday, November 10, 2009 at 3:42pm by mike

physics
a mass m1 moves along the x-axis with velocity of magnitude v0 on a frictionless table. it strikes another mass m2 which is initially at rest. the mass m1 goes off along the the y-axis. if half the original kinetic energy is lost in the collision, with what speed and at what ...
Tuesday, November 30, 2010 at 6:07pm by shamrakh

physics
An aluminum nucleus has 13 protons and 14 neutrons. A copper nucleus has 29 protons and 34 neutrons. What is the force of repulsion between an aluminum nucleus and a copper nucleus when they are separated by 10-9 m?
Tuesday, November 24, 2009 at 2:44pm by Alyson

Maths / physics
Calculate the rest mass (In grams) of an object whose rest energy is equal to the energy released by a tonne of tnt the energy liberated by 1 g of tnt = 4kJ Rest energy = moc 2 1 tonne of tnt equals 10^6 x 4kJ = 4 x 10^6 kJ x (3.0^8)sqrd = 3.6 x 10^23kJ is this right ?? i ...
Tuesday, August 27, 2013 at 10:37am by Wayne

chem 105
A gas mixture with a total pressure of 745mmHg contains each of the following gases at the indicated partial pressures: CO2, 257 mmHg; Ar, 123mmHg; and O2, 160 mmHg. The mixture also contains helium gas. What is the partial pressure of the helium gas? What mass of helium gas ...
Sunday, October 23, 2011 at 6:52pm by JULIE

Psychics
A freight car is moving freely along a railroad track at 7.0 m/s and collides with a tanker car that is at rest. After the collision, the two cars stick together and continue to move down the track. What is the magnitude of the final velocity of the cars if the freight car has...
Thursday, March 17, 2011 at 3:01pm by Kendra

Physics (IMPULSE)
A cart traveling at 0.3 m/s collides with stationary object. After the collision, the cart rebounds in the opposite direction. The same cart again traveling at 0.3 m/s collides with a different stationary object. This time the cart is at rest after the collision. In which ...
Monday, February 27, 2012 at 11:52pm by Mark

physics-Momentum
A Cadillac of mass 2210 kg going east collides with a Geo of mass 1240 kg headed north on a level highway. The cars remain tangled and slide to rest after traveling 25 m in a straight line at an angle of 20 north of east. The coefficient of kinetic friction for the tires on ...
Tuesday, March 29, 2011 at 1:35am by Thomas

Physics
An elevator's cable can handle a tension of 95,500N. Assuming the car has a mass of 2950 kg and it is carrying a full load of passengers whose combined mass is 3750 kg, what is the minimum time required for the elevator to rise 50.0 m from rest?
Sunday, February 17, 2013 at 4:50pm by Amy

physics
Two freight cars, each with a mass of 2.5 multiplied by 10^5 kg, collide and stick together. One was initially moving at 3.4 m/s and the other was at rest. What is their final speed?
Sunday, December 7, 2008 at 1:14pm by Anonymous

physics
Two freight cars, each with a mass of 3.9 105 kg, collide and stick together. One was initially moving at 3.2 m/s and the other was at rest. What is their final speed in m/s?
Thursday, December 9, 2010 at 8:36pm by lets go

physics
Two freight cars, each with a mass of 3.9 105 kg, collide and stick together. One was initially moving at 3.2 m/s and the other was at rest. What is their final speed in m/s?
Thursday, December 9, 2010 at 8:36pm by lets go

chemistry
A gas mixture with a total pressure of 745mmHg contains each of the following gases at the indicated partial pressures: CO2, 257 mmHg; Ar, 123mmHg; and O2, 160 mmHg. The mixture also contains helium gas. What is the partial pressure of the helium gas? What mass of helium gas ...
Sunday, October 23, 2011 at 7:13pm by samantha(very important)

Physics
What gravitational force do yhe two protons in the helium nucleus exert on each other? There separation is approximately 1.0 fm. I know that 1 fm is 10^-15 m i didnt know if that was how you figured it out to get it to N?
Monday, June 15, 2009 at 12:55am by Sarah

physics
Two neutron stars are seperated by a distance of 10^14 m. They each have a mass of 10^30 kg and a radius of 10^5 m. They are initiall at rest with respect to each other. How fast are they moving when their seperation has decreased to one-half its initial value? How fast are ...
Sunday, March 16, 2008 at 9:56pm by kristen

PHYSICS
A Few questions- please help!!! also show steps! What magnitude of force, acting for 0.025 s, will change the velocity of a 100 g ball from 30 m/s eastward to 40 m/s westward? A girl holds a 1.7 kg air rifle loosely and fires a bullet of mass 2 g. The muzzle velocity of the ...
Wednesday, January 4, 2012 at 8:13pm by Dyl

Physics
Block 1 of mass m1 slides from rest along a frictionless ramp from height h and then collides with stationary block 2, which has mass m2 = 3m1. After the collision, block 2 slides into a region where the coefficient of kinetic friction is μk and comes to a stop in ...
Tuesday, November 1, 2011 at 5:38pm by Isabel

chemistry
Nuclear physicists do it usually, in very small quantities. Some element has to be bombarded with either neutrons, or protons, and these have to be captured by each nucleus. As you can imagine, it is not easy, some what like swatting flies with a pencil in the dark. Most ...
Thursday, October 30, 2008 at 12:54pm by bobpursley

chemistry
1. name the three fundamental particles present in an atom? mention the masses of the particles in M.K.S. system? 2.what is a proton? stste its relative mass and charge? 3.how many times a proton is heavier than an electron? 4.what important information are furnished about the...
Friday, May 4, 2012 at 9:35pm by pooja

College Physics
Some kid (mass 20 kg) jumps with a velocity of 3.2 m/s horizontally off some steps (height 0.55 m) onto his heavy duty skateboard (mass 3 kg, height 0.03 m), which is initially at rest. How fast will he be skating? I don't where to start.
Saturday, October 16, 2010 at 4:45pm by Sam

Physics
A block of mass 17.9 kg supported by a vertical massless cable is initially at rest. The block is then pulled upward with a constant acceleration of 2.01 m/s2. What is the tension in the cable? What is the magnitude of the net force acting on the mass? What is the speed of the...
Wednesday, February 13, 2013 at 12:42pm by Jessica

physics
In co2 laser, the co2 vibrates when it collides with nitrogen atoms instead of getting excited to next level.Why? why is this vibration after collision is not seen in Helium-neon laser?please explain me
Saturday, October 27, 2012 at 9:41am by nanbala

phy
A ball of mass 0.540 kg moving east (+x direction) with a speed of 3.30 m/s collides head-on with a 0.740 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision? a)ball originally at rest m/s b)ball ...
Thursday, October 7, 2010 at 7:40pm by ami

Physics please help!!
A cart of mass M1 = 5.00 kg and initial speed = 3.00 m/s collides head on with a second cart of mass M2 = 3.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision. I have tried the answer 5.0 m/s however it says it is wrong. Please help!
Saturday, March 23, 2013 at 9:44am by Erin

Chemistry (Check)
Classify each of these statements as always true, sometimes true, or never true 1)___AT_____A mole of a pure substance contains 6.02 X 1023 atoms. 2)____ST____The representative particle of a compound is the molecule. 3)___NT_____A mole of CCl4 is composed of one atom of ...
Tuesday, February 6, 2007 at 3:27pm by bryan

physics
on a air track, a 400g glider moving to the right at 2.00m/s collides elastically with a 500g glider moving in the opposite direction at 3.00 m/s. Find the velocity of the first glider after the collision Find the velocity of the second glider after the collision
Friday, March 19, 2010 at 5:28pm by Alana

Physics
On an air track, a 403.0 glider moving to the right at 1.70 collides elastically with a 500.5 glider moving in the opposite direction at 3.00 . 1. Find the velocity of first glider after the collision. 2. Find the velocity of second glider after the collision.
Sunday, April 14, 2013 at 10:22am by Wesley

math
On an air track, a 403.0 glider moving to the right at 1.70 collides elastically with a 500.5 glider moving in the opposite direction at 3.00 . 1. Find the velocity of first glider after the collision. 2. Find the velocity of second glider after the collision.
Sunday, April 14, 2013 at 2:19pm by Wesley

Organic and Nuclear Chemistry
Regarding nuclear reactions that release a great deal of energy, which statement is true? A. In a fission chain reaction, a uranium nucleus struck by a high-energy neutron emits two neutrons. B. Nuclear fission releases more energy per unit mass than does a fusion reaction. C...
Friday, June 25, 2010 at 11:13am by Demi

physical science
The atomic mass unit is 1/12 the mass of carbon-12. Subatomic particles have nothing to do with it. Some myths float around that says the mass of the proton or neutron is equal to one amu, but that is most wrong.
Sunday, November 4, 2007 at 9:04pm by bobpursley

AP PHYSICS MECH.
In Figure 9-62, block 2 (mass 1.3 kg) is at rest on a frictionless surface and touching the end of an unstretched spring of spring constant 160 N/m. The other end of the spring is fixed to a wall. Block 1 (mass 2.1 kg), traveling at speed v1 = 4.0 m/s, collides with block 2, ...
Monday, February 14, 2011 at 7:28pm by vm

Chemistry
Calculate the mass defect and the binding energy/nucleon of the nuclide 9/4 Be, which has a mass of 9.01218224 amu. The mass of the proton is 1.00726747 amu and the mass of the neutron is 1.00866490 amu. I've gotten this far... mass of proton + mass of nuetron = 2.01594137. ...
Tuesday, June 8, 2010 at 12:47pm by Anonymous

physics
Two particles are in a uniform electric field whose value is +4000 N/C. The mass and charge of particle 1 are m1 = 1.0x10-5 kg and q1 = -15 C, while the corresponding values for particle 2 are m2 = 3.0 x10-5 kg and q2 = +35.0 C. Initially the particles are at rest. The ...
Monday, October 4, 2010 at 1:25pm by Nate

Physics
A balloon with a mass of 100 kg is filled with helium (density = 0.179 kg/m3). The balloon is spherical and has a diameter of 12.0 m. What is the maximum mass that can be attached to the bottom of this this helium balloon, for it to be able to fly? The density of air is 1.29 ...
Wednesday, December 1, 2010 at 12:03am by Nicole

physics
a ball of mass 0.4 kg is initially at rest on the ground. It is kicked and leaves teh kicker's foot with a speed of 5 m/s in a direction of 60 degrees above the horizontal. What is the impulse
Wednesday, November 30, 2011 at 4:14pm by emma

respost A&P
I cannot respond regarding content, but I'll give you feedback on English, grammar, usage, etc. Paragraph 1 Where does the first quotation end? The second quotation seems to be over half of the introduction, but with no interpretation or explanation from you; therefore, there'...
Sunday, July 20, 2008 at 10:53am by Writeacher

physics
A child in a boat throws a 5.15-kg package out horizontally with a speed of 10.0 m/s. The mass of the child is 24.2kg and the mass of the boat is 33.2kg . Calculate the velocity of the boat immediately after, assuming it was initially at rest.
Friday, March 14, 2014 at 9:02am by Edward

physics
A sled initially at rest has a mass of 47.2 kg, including all of its contents. A block with a mass of 14.5 kg is ejected to the left at a speed of 13.5 m/s. What is the speed of the sled and the remaining contents?
Tuesday, February 22, 2011 at 10:30pm by Anonymous

physics
A sled initially at rest has a mass of 47.2 kg, including all of its contents. A block with a mass of 14.5 kg is ejected to the left at a speed of 13.5 m/s. What is the speed of the sled and the remaining contents?
Tuesday, February 22, 2011 at 10:30pm by Anonymous

Physics
Suppose a nucleus of 93X236 fissions into two fragments whose mass ratio is 0.37:0.63. With the aid of the drawing, estimate the energy (in MeV) released during this fission. The drawing Shows A large. The A1 smaller the A2, A2 is nearly double the size of A1
Friday, August 3, 2012 at 12:04pm by Beth

physics
Volume of air in the balloon = V =(4/3)*PI*r^3 = (4/3)*PI*0.5^3 mass of air displaced is 1.29 * V mass of helium is 0.181*V Upward force due to pressure difference between helium and air is (1.29 - 0.181)*V Sum of forces in the y direction is 0: (1.29 - 0.181)*V - T - 0.0120...
Saturday, December 15, 2012 at 9:28pm by Jennifer

physics
2) Two objects, A and B, initially at rest, are "exploded" apart by the release of a coiled spring that was compressed between them. As they move apart, the velocity of object A is 5 m/s and the velocity of object B is -2 m/s. What is the ratio of the mass of object A to the ...
Wednesday, April 6, 2011 at 2:38pm by arun

Physics
The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of 2 protons and 2 neutrons). (a) What is the force between the two alpha particles when they are 5.00x10^-15 m ...
Saturday, March 14, 2009 at 3:57am by Sonam

physics
A hockey player shoots the puck which is initially at rest by applying a force of 72 N through a displacement of 1.6 m. The mass of the puck is 161 grams.
Saturday, March 31, 2012 at 6:30pm by Anonymous

physics
a body of mass 5kg initially at rest is subjected to a force of 20N. find the kinetic energy acquired by the body at the end of 10s.
Wednesday, January 16, 2013 at 10:12am by prudhvi

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?
Thursday, October 10, 2013 at 2:13am by Matt

Physics
An object whose mass is unknown is held by two rigid rods. The whole system is at rest. The angle between the vertical direction and the left rod from point A to B is 60 degrees. The angle between the vertical direction and the right rod from point C to D is 30 degrees. The ...
Monday, June 24, 2013 at 2:53pm by Brittany

Chemistry 105
A gas mixture with a total pressure of 745 mmHg contains each of the following gases at the indicated partial pressures: CO2, 257 mmHg; Ar, 123 mmHg; and O2, 160 mmHg. The mixture also contains helium gas. What is the partial pressure of the helium gas? What mass of helium gas...
Sunday, October 23, 2011 at 5:34pm by JULIE

mit physyscs
A block of mass 2 kg is initially at rest on a horizontal surface. At time , we begin pushing on it with a horizontal force that varies with time as , where 0.6 N/s . We stop pushing at time s [ for ]. (a) First, assume the surface is frictionless. What is the magnitude of the...
Friday, December 6, 2013 at 10:26am by juanpro

physics
Ann, a 59.2 kg person throws a 0.0435 kg snowball forward with a ground speed of 39.5 m/s. Billy, with a mass of 63.5 kg, catches the snowball. Both people are on skates. Ann is initially moving forward with a speed of 2.22 m/s, and Billy is initially at rest. After the ...
Sunday, October 21, 2012 at 9:19pm by Anonymous

physics
Two people, one of mass 85 kg and the other of mass 50 kg, sit in a rowboat of mass 90 kg. With the boat initially at rest, the two people, who have been sitting at opposite ends of the boat, 3.5 m apart from each other, now exchange seats. How far does the boat move?
Thursday, May 19, 2011 at 8:47pm by homcahbiec

Physics
Suppose a nucleus of 93X236 fissions into two fragments whose mass ratio is 0.37:0.63. With the aid of the drawing, estimate the energy (in MeV) released during this fission. Ive treied to do this problem but i keep getting the wrong answer. I keep getting 164.253 MeV
Wednesday, August 1, 2012 at 5:16pm by Beth

Chemistry
Calculate the mass defect and the binding energy/nucleon of the nuclide 9/4 Be which has a mass of 9.012 182 24 amu. The mass of a proton is 1.007 276 47 amu and the mass of a neutron is 1.008 664 90. one amu= 1.6605*10^-27 and the speed of light is 3.00*10^8 m/s
Monday, June 7, 2010 at 11:22am by Michael

Chemistry
Calculate the mass defect and the binding energy/nucleon of the nuclide 9/4 Be which has a mass of 9.012 182 24 amu. The mass of a proton is 1.007 276 47 amu and the mass of a neutron is 1.008 664 90. one amu= 1.6605*10^-27 and the speed of light is 3.00*10^8 m/s
Monday, June 7, 2010 at 11:22am by Michael

Physics Someone help please!
An example of the neutron absorption reaction is . 1 0 n+10 5 B-->7 3 Li+ 4 2 He The rest masses of each particle in atomic mass units (u) are 1 0 n= 1 u 10 5 B=10 u 7 3 Li =7 u 4 2 He= 4 u where 1u=1.66x10^-27 kg. calculate Q Q= in MeV I have the same question please ...
Wednesday, May 8, 2013 at 3:53pm by Amy

physical science
How much work is done by the gravitational force on an object of mass 9.40 kg that is initially at rest when it falls down for a time of 1.85 seconds. Ignore air resistance
Monday, December 21, 2009 at 2:37pm by jhon

Physics Help
A small, 200 g cart is moving at 1.50 m/s on an air track when it collides with a larger, 2.00 kg cart at rest. After the collision, the small cart recoils at 0.890 m/s. Q: What is the speed of the large cart after the collision? How do you set this up? Would it be like (mass ...
Saturday, August 6, 2011 at 3:33pm by Cat21

Physics, so confused
A cart of mass M1 = 5.00 kg and initial speed = 3.00 m/s collides head on with a second cart of mass M2 = 3.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision. I am not sure how to find this answer without having a V2 for the first ...
Tuesday, March 26, 2013 at 6:31pm by Morgan

science
a car of mass 100 kg traveling at 72 km/hr is brought to rest by applying the brakes.assuming that the kinetic energy of the car becomes transferred to internal energy in four steel brakes drum of equal mass, fine the rise in temperature of the drums if the total is 20kg, the ...
Wednesday, May 8, 2013 at 9:42am by ing-marie

Physics
You have been asked to design a "ballistic spring system" to measure the speed of bullets. A bullet of mass m is fired into a block of mass M. The block, with the embedded bullet, then slides across a frictionless table and collides with a horizontal spring whose spring ...
Sunday, March 23, 2014 at 8:38pm by Marie

Physics
Two objects A and B are involved in a totally elastic collision The mass of A is 8.8 kg and the mass of B is 0.5 kg. The velocity of A is 4.5 m/s and the velocity of B is 0 m/s. If they collide elastically, what will be the final velocity of A in m/s?
Monday, July 9, 2012 at 7:22pm by M

algebra
the mass of a neutron is 1.67(10^(-27))kg. what is the mass of 7.03(10^(21))neutrons?
Wednesday, August 4, 2010 at 10:20pm by antonio

science
Does anybody know any real life example of a nucleus Are you speaking of nucleus as in the nucleus of an atom or the nucleus of a living organism? If the former, the nuclear atom bomb or H bomb or the decay of radioactive materials to bombard some cancer patients to kill the ...
Sunday, April 15, 2007 at 3:24pm by Amy L.

PHYSICS
An electron is initially at rest in, but not on the axis of, a solenoid that is carrying a steady current I directed as shown in the cross section below (counterclockwise). The electron is initially at rest on the -x axis. The current in the solenoid is suddenly increased to ...
Tuesday, December 17, 2013 at 9:51pm by asha

chem
how would you find the answer? A carbon nucleus has six protons and six neutrons. How many electrons would it take to equal the mass of a carbon nucleus?
Monday, December 6, 2010 at 8:05pm by hannah

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