# If the relative atomic mass of CH2O is calculated it's empirical formula (C=12,H=1,O=16)

46,086 questions, page 295

The decomposition of hydrogen peroxide in the presence of potassium iodide is believed to occur by the following mechanism: step 1 slow: H2O2 + I^- = H2O + OI^- step 2 fast: H2O2 + OI^- = H2O + O2 + I^- 1) What is the equation for the overall reaction? Use

asked by Hannah on March 9, 2012

The decomposition of hydrogen peroxide in the presence of potassium iodide is believed to occur by the following mechanism: step 1 slow: H2O2 + I^- = H2O + OI^- step 2 fast: H2O2 + OI^- = H2O + O2 + I^- 1) What is the equation for the overall reaction? Use

asked by Hannah on March 11, 2012
3. ## calculus

Rice production requires both labor and capital investments in equipment and land. Suppose that if x dollars per acre aer invested in labor and y dollars per acre are investd in equpiment and land, then the yield P of rice per acre is given by the formula

asked by dawn on November 16, 2010
4. ## Chemistry HEAT OF FUSION

What amount of energy is required to melt a 26.9 g piece of ice at 0oC? The heat of fusion of ice = 333 Jg-1 Heat required to melt the ice = J What amount of energy must be removed from 120 g of water to cool it from 72.1oC to 12.4oC? Specific heat of

asked by tanner on October 6, 2011
5. ## Physics

The De-orbit Burn The Shuttle must reduce its velocity at a pre-calculated point in its orbit in order to return to Earth. In order to reduce the velocity and change the orbit of the Shuttle, a maneuver called the de-orbit burn is performed. For this

asked by Rory on December 28, 2011
6. ## physics

Hi, I am confused about physics, more specifically force. I know that the formula for force is: f=ma So what if an object traveling at constant speed (acc equals zero) collides with a wall? How would you calculate the force, since there is no acceleration?

asked by Ashley on June 28, 2005
7. ## Chemistry Check if its right XD

Ok here is the problem but i only need help on part a XD i think i did it wrong..so can you check my work? and tell me where i made the mistake? The space shuttle uses aluminum metal and ammonium perchlorate, NH4ClO4, in tis reusable booster rocket. The

asked by becky on January 9, 2007
8. ## Finance

I need to know the formula for finding the 'lost sales'. I'm given the following information. a. New Output b. Lost Output (Construction) c. New Sales d. New Gross Margin e. New Gross Profit f. Old Output g. Old Sales h. Old Gross Profit i. Incremental

asked by Lyra on September 21, 2017
9. ## science

In the formation of the solar system nearly all of the mass of the solar nebula became ? Answer Are Terrestrial planets GAS giant SUN OORT CLOUD THANK YOU

asked by snow on April 14, 2014
10. ## Physics

A firefighter of mass 73 kg slides down a vertical pole with an acceleration of 5 m/s2. The acceleration of gravity is 10m/s2. What is the friction foce that acts on him? Answer in units of N

asked by AJ on January 7, 2014
11. ## chemistry

According to the following thermochemical equation, what mass of H2O (in g) must form in order to produce 975 kJ of energy? SiO2(s) + 4 HF(g) → SiF4(g) + 2 H2O(l), ΔH°rxn = -184 kJ

asked by Amber on June 14, 2011
12. ## physics

A freight train has a mass of 1.4 107 kg. If the locomotive can exert a constant pull of 8.1 105 N, how long does it take to increase the speed of the train from rest to 66 km/h?

asked by savy on October 7, 2011
13. ## physics

A freight train has a mass of 2.1 × 10^7 kg. If the locomotive can exert a constant pull of 6.2 × 10^5 N, how long would it take to increase the speed of the train from rest to 77.7 km/h? (Disregard friction.)

asked by jay on December 17, 2010
14. ## physics

A person whose mass is m = 100.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 32.7° with the horizontal. What is the reading on the scale?

asked by Anonymous on July 9, 2014
15. ## Physics

A man of mass 75 kg lies on a bed of 10,000 nails. The tip of each nail has an area of 1.0 square millimeter. What pressure does the man experience? [g=10 N/kg]

asked by Erin on April 12, 2014
16. ## chemistry

1. How do you know that NO2 (with a negative charge 1) is an anion and not ionic compound? 2. What are the SI standard units for length and mass? Why ins't there a standard SI unit for volume?

asked by becca -- got final exam tomorrow help! on January 26, 2009
17. ## physic

A water skier has a mass of 73 kg. Find the magnitude of the net force acting on the skier when she lets go of the tow rope and glides to a halt in 20 s.

asked by hy on December 4, 2010

A force used to lift a 12-kilogram mass to a height of 8 meters in 2 seconds does 1040 joules of work. QUESTIONS: A;How much force is used? B;What power is developed?

asked by MATHEWS on November 9, 2010
19. ## physics

A catcher stops a 200km/h pitch in his glove, bringingit to rest in 0.15meters. If the force exerted by the catcher is 803N, what is the mass of the ball?

asked by Quigley on November 27, 2009
20. ## physics

A catcher stops a 200km/h pitch in his glove, bringing it to rest in 0.15meters. If the force exerted by the catcher is 803N, what is the mass of the ball?

asked by Quigley on November 27, 2009
21. ## physics

A 3.5 kg mass sits at rest on a rough surface. The surface has the following coefficients of friction: µs = 0.53 and µk = 0.21. Determine the required force to start the object moving?

asked by Bolke on December 2, 2011
22. ## Physics

Calculate the weight of an astronaut whose mass (including spacesuit)is 72kg on the surface of the moon? What is the astronauts weight on Earth? Comment on the difference

asked by Nicole on February 25, 2015
23. ## physics

A truck of mass 5000kg is travelling down the highway when it breaks suddenly. The unbalanced force F acting on the truck when it is braking is 6000N. What is the acceleration?

asked by Dare on September 20, 2011
24. ## Physics

A lamp of mass 5kg is hung from two hooks 2.5cm apart on the horizontal ceiling of room by strings of length 1.5m and 2m.Find tension in the strings?

25. ## physics...

T^2=((4pi^2)/(GM_E))r^3 Substitute the period in seconds, T = 86,400 s, the gravity constant G = 6.67 multiplied by 10-11 kg-1 m3/s2, and the mass of the Earth, ME = 5.98 multiplied by 1024 kg. Solve for r.

asked by cb on March 15, 2009
26. ## physics

a skier with mass m slides down a slope that makes an incline of theta with the horizontal. Which expression described the component of the force of gravity parallel to slope?

asked by caleb on September 28, 2018
27. ## Chemistry

The Goodyear blimps, which frequently fly over sporting events, hold approximately 1.90×10^5 ft^3 of helium. If the gas is at 25 C and 1.0 atm, what mass of helium is in the blimp?

asked by Monica on October 4, 2009
28. ## physics

A guitar string is 97 cm long and has a mass of 3.6 g. The length L from the bridge to the support post is 61 cm, and the string is under a tension of 570 N. What is the frequency of the fundamental tone?

asked by kassy on December 5, 2016
29. ## physics

With friction turned on, set the initial velocity of the box to 1.75 m/s, the coefficient of friction to 0.60, and the mass to 1.5 kg. Assume the acceleration due to gravity has a magnitude of 9.8 m/s2.

asked by Anonymous on October 13, 2014
30. ## physics

A block of mass 10kg is pulled horizontally by a force of 75N that makes an angle of 37° to the horizontal whose coefficient of friction is 0.4 . what is the acceleration of the block

asked by Eyosias on January 18, 2015
31. ## college chemistry

Express the concentration of a 0.0620M aqueous solution of fluoride, F-, in mass percentage and in parts per million. assume the density of the solution is 1.00g/mL.

asked by Linda on September 11, 2014
32. ## Physics

A curve of radius 55 m is banked so that a car of mass 1.5 Mg traveling with uniform speed 57 km/hr can round the curve without relying on friction to keep it from slipping on the surface.

asked by Samantha on November 16, 2011
33. ## Physics

An explosion breaks an object into two pieces, one of which has 2 times the mass of the other. If 22500 J were released in the explosion, of which 21% is heat, how much kinetic energy did each piece acquire?

asked by Anonymous on March 2, 2014
34. ## health

What does the U.S. government use to estimate a person’s body weight status? A. Health related illnesses B. Body mass index C. Scale D. Ruler

asked by Anonymous on October 30, 2014
35. ## physics

A horizontal force of 5.0 N is required to move a body of mass 3.0 kg with uniform velocity along a horizontal floor. Find the coefficient of kinetic friction.

asked by Ange on November 17, 2011
36. ## chemistry

How many grams of NAC2H3O2 must be dissolve in enough water to prepare 250.0 mL of a solution with a pH= 9.200? Molar mass of NaC2H3O2 ia 82.03 g/mol. Ka for C2H3O2H is 1.8x10^-5

37. ## Physics

A 1000kg elevator is carrying 10 people at a constant velocity over a distance of 30.0m. Assuming the average mass of a person is 60.0kg, how much is used by the elevator engine?

asked by physics on October 30, 2018
38. ## maths

A block of mass 20kg resting on a horizontal force 50N.If the coefficient of friction between the table and the block is 0.45,calculate the acceleration with which it moves

asked by Kingsley on November 27, 2011
39. ## physics

two blocks of each mass m=3.75kg are fastened to the ceiling of an elevator. If the elevator accelerates upward at 1.6m/s^2. Find the tension in T1 and T2 in each upper and lower rope

asked by Rebecca on March 11, 2015
40. ## Physics

An astronaut exerts a 190-N force pushing a beam into place on the International Space Station. The beam accelerates at 0.14 m/s2 .Determine the mass

asked by Anonymous on September 13, 2016
41. ## Physics

.A mass of 1.61 kg stretches a vertical spring 0.313 m. If the spring is stretched an additional 0.132 m and released, how long does it take to reach the (new) equilibrium position again?

asked by GG girl on June 5, 2011
42. ## Physics

A guitar string is 108 cm long and has a mass of 2.90 g. From the bridge to the support post (L) is 70 cm, and the string is under a tension of 470 N. What is the frequency of the first overtone? Only 1 try left please help.

asked by Anon on July 7, 2016
43. ## physics

A chain consisting of 5 links, each of mass 0.100kg is lifted vertically with a constant acceleration of 2.50 m/s^2. Calculate the force that link 2 exerts of link 1.

asked by Anonymous on September 30, 2009
44. ## chm

An aqueous solution that is 10.0 percent sulfuric acid (H2SO4) by mass has a density of 1.143 g/mL. Determine the molality of the solution. ( 3 significant figures)

asked by tyler on February 3, 2015
45. ## Physics

A mass of 1.66 kg stretches a vertical spring 0.312 m. If the spring is stretched an additional 0.136 m and released, how long does it take to reach the (new) equilibrium position again?

asked by Tim on November 10, 2010
46. ## chm

An aqueous solution that is 10.0 percent sulfuric acid (H2SO4) by mass has a density of 1.143 g/mL. Determine the molality of the solution. ( 3 significant figures)

asked by vikki on February 3, 2015
47. ## physics

A block and tackle pulley system is used to lift a mass of 200 kg.if the machine has a velocity ratio of 5 and efficiency of 80%.sketch the possible arrangement of the system

asked by moses on November 27, 2016
48. ## physics

A box with a mass of 5 kg rests on a ramp with incline of 30 degrees. Calculate the maximum static force to keep the box from sliding dawn the rope.

asked by Banele on February 12, 2014
49. ## chemistry

A sample of a breathing mixture for divers comtained 34.3% helium, 51.7% nitrogen, and 14% oxygen, by mass. What is the density of this mixture at 22degree celcius and 755mmHG?

asked by Vicky on May 24, 2011
50. ## Science HELP

According to the law of conservation of mass, what should the product side of this single replacement reaction look like? Zn+2HCl--->? A. H2ZnCl2 B. H2+Zn+Cl2 C. H2+ZnCl2 D. ZnCl2 Is the answer D?

asked by Callie on November 6, 2014
51. ## physical science

What is the change in thermal energy of water in a pond with a mass of 1,000kg and a specific heat of 4,184j(kgdegreesc) if the water cools by 1 degree c

asked by zack on October 27, 2009
52. ## physics

a 0.25 kg mass at the end of a spring oscillates 2.2 times per second with an amplitude of 0.15m. Determine the speed when it passes the equilibrium point and the speeed when it is 0.1 m from equilibrium

asked by michael on January 25, 2015
53. ## Physics

OK, so I'm having some serious problems with this one question. It's on relativity. Here it is: Calculate the mass of a proton (m0 = 1.67E-27 kg) whose kinetic energy is one sixth its total energy. How fast is it traveling? THANKS!!

asked by Marissa on April 19, 2009
54. ## Physics Constant Force question help.

A constant force acting on body mass 5 kg changes its speed from 2 m/s to 7 m/s , the direction of motion remains unchanged, find FORCE. answer is 2.5, but help me solve it, thanks

asked by Shahab Mirza on October 2, 2014
55. ## physics

A baseball has a mass of about 0.15 kg, and it is pitched towards home plate at a speed of about 60 m/s. If the bat exerts an average force of 8600 N for 2.4 ms, what is the final speed of the ball in m/s?

asked by han on January 7, 2015
56. ## Chemistry 11

A 5.0 g sample of Cu(NO3)2-nH20 is heated, and 3.9 g of the anhydrous salt remains. What is the value of n? I got as far as finding the molar mass of Cu(NO3)2, which is 187.5g/mol Please help me further with this question.

asked by Rona on November 1, 2016
57. ## Chemistry

If vapour density of gas 32g and occupies a volume of 560cm cube find the mass of the gas also determine its number of molecule

asked by Goodness on June 2, 2014
58. ## Physic II

a small sphere with a mass of 108.0 g is moving along the y-axis when it encounters an electric field of 5.0i N/C . If the sphere suddenly accelerates 13.0i m/s^2, what is the charge that it carries?

asked by Cananisi on January 26, 2014
59. ## physics

The block of mass 1.75337 kg has an acceleration of 3.8 m/s2 as shown. What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s2 and the surface is frictionless. Answer in units of N

asked by Jules on November 4, 2011
60. ## physics

In a device known as an Atwood machine, two masses m1=10kg and m2=20kg are connected by rope over a frictionless pulley. What is the acceleration of each mass if the rope is massless?

asked by Mike on November 22, 2010
61. ## physics

what is the centripetal force of the train in the previous problem whose speed is 27.8 m/s rounding a curve whose radius of curvature is 150m if the train mass is 8000 kg

asked by Dulce on September 29, 2014
62. ## physics

a labourer lifts 100 stone to a height of 6m in two minute.if mass of each stone be one kilogram, calculate the average power ( gravity = 10ms-² )

asked by VAIBHAV on October 4, 2016
63. ## Physics

In a binary star system, two stars orbit about their common center of mass, as shown in the figure . If r2 = 2r1, what is the ratio of the masses m2/m1 of the two stars?

asked by Real on July 30, 2011
64. ## physics

if the cart in the last question collides INELASTICALLY with a stationary cart of mass 150 g, what is the kinetic energy of the carts after the collision (LEAVE OUT units of J)?

asked by john on March 20, 2014
65. ## Physics

Two objects of equal mass m are separated by a distance r. Which expression gives the gravitational potential at the point P mid way between the two objects? The answer shows as -4Gm/r, but I can't see where this comes from.

asked by Christine on January 11, 2011
66. ## Physics 101

A uniform sign is supported at P as shown in the figure. If the sign is a square 0.8 m on its side and its mass is 10 kg, what is the magnitude of the horizontal force that P experiences? ANSWER: 25 N 49 N 98 N 0 N

asked by A.B. on October 27, 2013
67. ## science

A load of mass 10kg is raised through a height of 15m from the ground where it was initially at rest when it at that height it has velocity of 20m/s. find the work done.

asked by isha rani on September 27, 2018
68. ## Chemistry

A recipe calls for 5M of sucrose (C12H22O11) dissolved in 750mL of H2O. Please calculate the total mass (g) of sucrose needed. Show all work.

asked by Melissa on December 4, 2016
69. ## physics

The planet Jupiter has a satellite, Io, which travels in an orbit of radius 4.220×108 m with a period of 1.77 days. Calculate the mass of Jupiter from this information.

asked by sam on April 23, 2014
70. ## Physics

SO a car has a mass of 1000 kg and is travelling at 20 m/s. the brakes exert a steady force of 5000 N. whats is the deceleration and how long does it take to stop the car

asked by Norell on January 11, 2019
71. ## chemistry

Calculate the mass of salt needed to prepare 100 cm3 of 0.05 M solution of: (i) Fe(NH4)2(SO4)2.6H2O (ii) FeNH4(SO4)2.12H2O

asked by sheetal on September 12, 2018
72. ## Physics

How much work W must be done on a particle with a mass of m to accelerate it from a speed of 0.905c to a speed of 0.980c? Ok I know that you compute the Lorenz factor gamma but my question is what value would you use for the v? And do you minus anything

asked by Sam on April 3, 2009
73. ## UST PHYSICE

a body of mass 6kg is whirled in a horizontal circle of radios 1.5m with a uniform velocity 3m/s. calculate 1. the angular velocity 2. the centripetal acceleration.

asked by Anaebo on November 15, 2011
74. ## physics

two pellets each with a charge of 1 microcoulomb 10 to the negative 6 c are located 3 cm apart what is the electrical force between them what would be the mass of a object that would experience the same force in the earths gradational field

asked by christina on February 2, 2009
75. ## gdme

A fuel consists of 85% C, 12.5% Hydrogen, 2.5% residual matter by mass, Working from 1st principles, find lower calorific values per kg of fuel.

76. ## chemical calculations

A brick of silver with a mass of 31.5 kg measures 0.150 m long, 42.0 cm wide, and 72.00 mm thick. Calculate density of silver in grams per cubic centimeter?

asked by Michael G on February 2, 2014
77. ## physics

A charged particle of mass 8.39×10−4 kg starts from rest and accelerates through a potential difference of +25,000 V to reach a speed of 1170 m/s. What is the charge on this particle?

asked by linda on November 14, 2013
78. ## physics

A bullet of mass 20 g moving with a speed of 120 m/s hits a thick muddy wall & penetrates into it. It takes 0.03 s to stop the wall then what is the answer

asked by muskan sharma on July 22, 2014
79. ## Physics

An object wuth a mass of .5 kg starts from rest and achieves a maximum speed of 20m/s in 0.01 s. What average unbalanced force accelerates this object?

asked by Ronaldo on November 21, 2011
80. ## physics

A diver with a mass of 51 kg reaches a maximum height of 5.8 m above the water. When the diver has fallen 2.8 m from the apex, what is her kinetic energy (J)? Assume horizontal velocity is zero.

asked by abby on July 20, 2014
81. ## Physics

A baseball has a mass of .145 kilograms. A pitcher's fastball travels at 42 m/s. How much force is applied to the ball if the catcher stops the ball in .05 sec?

asked by Yuki on October 18, 2011
82. ## Chem

A 500 -cm3 flask contains 0.420g of a gas at a pressure of 160kPa and a temperature of 330K. What is the molecular mass of this gas? M=____g/mol? Ty

83. ## Chemistry

A 0.2861 gram sample of an unknown acid (HX) required 32.63 mL of 0.1045 M NaOH for neutralization to a phenolphthalein endpoint. What is the molar mass of the acid?

asked by Jake on February 19, 2009
84. ## science

A body of mass 10kg is raised through a height of 15m from the ground where it was initially at rest when it was at that height it has velocity of 20m/s. find the work done.

asked by isha rani on September 27, 2018
85. ## physics

the net external force on a golf cart is 390 n north. if the cart has a total mass of 220 kg. what is the magnitude and direction of its acceleration

asked by ange on September 7, 2014
86. ## physics qui

The radius of the Earth is 6.37Ã—1000000 m and its average dencity is 5.517Ã—1000kg/mÃ—mÃ—m.calculate the mass of earth to correct significant figures.

asked by Anonymous on October 21, 2016
87. ## science

Force is exerted to move a body of mass 50kg from 2 m/s to 5m/s over a period of 10 seconds.draw a velocity time graph regarding the same and calculate the value of force.

asked by nafiya on September 27, 2016
88. ## solubility graph

A mass of 30 f of potasium nitrate is dissolved in 100 cm3 of water at 100gC. How many more grams of potassium nitrate must be added to saturate the solution?

asked by tony on November 10, 2008
89. ## physics

A still block slides over a still surface,if the mass of the pot is 2.00kg what is the force of friction opposing the motion?coefficient of kinetic friction is taken as 0.42.Gravity is 9.8

asked by mary on November 24, 2011
90. ## physics

a 1500 kg car moving at 20 m/s strikes a truck waiting at a traffic light, hooking the bumpers. The two continue to move together at 10 m/s. What was the mass of the truck?

asked by garrett on March 30, 2014
91. ## physics

A freight train has a mass of 6.5 107 kg. If the locomotive can exert a constant pull of 11.5 105 N, how long would it take to increase the speed of the train from rest to 85 km/h? s

asked by Anonymous on January 2, 2011
92. ## science

Alfredo, who has a mass of 60 kilograms, jumped off a retaining wall. His kinetic energy when he landed on the ground was 822 joules. How high was the wall?

asked by Joe on April 16, 2014
93. ## science

an elephant of mass 500kg stands with all four feet on the ground. each foot has an area of 0.08m^2.calculate the pressure exerted on the ground.[g=10m/s^2]

asked by kwame on October 17, 2014
94. ## physics

A baseball has a mass of about 0.14 kg, and it is pitched towards home plate at a speed of about 46 m/s. If the bat exerts an average force of 9500 N for 1.7 ms, what is the final speed of the ball in m/s?

asked by Jacob Szczepanski on February 23, 2014
95. ## physics

An elevator (mass 4175 kg) is to be designed so that the maximum acceleration is 0.0700g. What is the maximum force the motor should exert on the supporting cable? What is the minimum?

asked by Meghan on November 14, 2010
96. ## Science

A rectangular brick measures 6cm by 9cm by 20cm and has a mass of 2.563 kilograms. What is the density of the brick in grams per cubic centimeter?

asked by Ericka on October 27, 2013
97. ## Physics

An object has a mass of 100 lb is projected from the ground level in the air at an angle of 60 degrees with the horizontal direction with a velocity of 72 km/hr. What is the projection velocity in m/s ?

asked by KeKe on October 17, 2016
98. ## geography

In The Deadliest Tsunami History all of the following were effects of the tsunami except lack of food no clean water mass animal deaths*** the coastline was destroyed

asked by Lost on October 3, 2016
99. ## chemistry

What mass in grams of sodium hydroxide is produced if 20.0 g of sodium meal reactts with excess water according to the chemical equation 2 Na(s)+2 H2O(l)=2 NaOH(aq)+H2(g)?

asked by Anonymous on April 23, 2008
100. ## Engineering Physics

You want to use a spring (k=100 N/m) to send a 500-g mass up a frictionless incline (30 degree to horizontal) to arrive at a platform 3m above the ground. How far should you compress the spring?

asked by John on July 1, 2012