1. Physics

    A horizontal force of 150 N is used to push a 43.5 kg packing crate a distance of 5.30 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. (a) the work done by the 150 N force (b) the coefficient of kinetic

    asked by Raqual on November 8, 2011
  2. Physics

    A 12 g bullet is fired horizontally into a 96 g wooden block initially at rest on a horizontal surface. After impact, the block slides 7.5 m before coming to rest. If the coefficient of kinetic friction between block and surface is 0.60, what was the speed

    asked by Nicole on January 5, 2012
  3. Phyics

    1)A logging truck is dragging a 427 kg log through the forest at a constant speed of 3.5 m/s. If the truck is applying a force of 1047 N to the log to keep it moving, what is the coefficient of friction between the log and the ground? im thinking you use

    asked by Anonymous on October 31, 2009
  4. physics

    In Fig. 8-49, a block slides down an incline. As it moves from point A to point B, which are 3.0 m apart, force acts on the block, with magnitude 3.8 N and directed down the incline. The magnitude of the frictional force acting on the block is 5.3 N. If

    asked by Anonymous on October 14, 2010
  5. physics

    At a carnival, you can try to ring a bell by striking a target with a 8.46-kg hammer. In response, a 0.411-kg metal piece is sent upward toward the bell, which is 5.22 m above. Suppose that 34.4 percent of the hammer's kinetic energy is used to do the work

    asked by kate on August 29, 2015
  6. Physics

    Which of the followning equations shows the relationship between the potential energy and height? Explain how you know. potential energy=m(height)+b potential energy=a(height)^2 +b(height)+c potential energy=a/height

    asked by Willie on November 2, 2009
  7. Art

    Here are the last sentences on the same theme. 1) This important feature makes power lines able to transport electric energy without any problem connected with dissipation of energy. They are useful in aerospace industry because they can keep a big amount

    asked by John on June 4, 2012
  8. physics

    A particle B of mass 10g is shot vertically upward from a point O with velocity 10m/s. The horizontal plane containing O is the reference level of the gravitational potential energy .Neglect all air effects. a) Calculate the mechanical energy of the system

    asked by angy on September 19, 2016
  9. physics

    A particle B of mass 10g is shot vertically upward from a point O with velocity 10m/s. The horizontal plane containing O is the reference level of the gravitational potential energy .Neglect all air effects. a) Calculate the mechanical energy of the system

    asked by angie on September 19, 2016
  10. Life Science

    I tried looking and can't find or understand where the following answer are. Please help me, I feel like I'm going crazy. I’m not sure about the answers I wrote but if someone could correct them and help me out with the ones I didn’t get.

    asked by Bretagne on January 27, 2008
  11. Physics

    If a projectile is launched from Earth with a speed equal to the escape speed, how high above the Earth's surface is it when its speed is three-fifths the escape speed? I keep getting the answer 2.56x10^6 m after solving it a few different ways. Help would

    asked by Kristin on April 28, 2012
  12. Physics

    1. How is average speed related to instantaneous speed? What certain conditions must be met for the two variables to have the same or close value? 2. Cite one practical example on the use of the concepts of instantaneous speed, average speed in observing

    asked by Jade on July 2, 2014
  13. Physics help please

    A gamma ray with 700KeV energy is Compton-Scattered from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron. i found the photon energy using compton scatter

    asked by Sarah on September 25, 2014
  14. Math

    Can you please help me figure out what to do? ... here is the question ... I have 20 ft of fencing to make a rectangular pen for my dog. What is the largest area that I can fence in? ... Not sure what to do ... thank you!

    asked by May on October 9, 2007
  15. English

    (At a pet shop) 1. We can't have him in our apartment. (him = a kind of dog) 2. Why don't you get a poodle? ----------------------------------- Q1: In #1, what does 'have' mean? Does it mean 'keep' or 'raise'? Q2: In #2, what does 'get' mean? Does it mean

    asked by rfvv on June 23, 2017
  16. english

    what is the significance of jack london's portrayal of the man and the dog in " to build a fire" and how does it relate to naturalism?

    asked by tina on December 2, 2007
  17. Math

    Laura has 20 feet of fencing to make a rectangular pen for her dog. What is the largest area that she can fence in?

    asked by Sandra on October 30, 2008
  18. Language

    Is the sentence correct? I have an unusual cat; it often acts like a dog. Answer: I think it should be a comma where the semi colon is placed

    asked by Please Help on August 14, 2014
  19. 10th grade

    Bert viewed the hot dog provincial, beliving that to eat such a disgusting food was beneath him

    asked by Anonymous on June 17, 2010
  20. Teaching dogs Tricks

    Please check my answer thanks Mimicking should be used only for behaviors that A. can't be elicited any other way. B. the dog can't perform well. C. are very involved. D. are difficult to lure I say A

    asked by Sam on August 25, 2008
  21. Science

    A change of the DNA in an organism that results in a new trait is known as? Mutation A group of dog offspring is known as Litter

    asked by Colton Constancio on February 8, 2012
  22. English

    1. I returned it for you. 2. I blessed it for you. 3. I dog-eared it for you. 4. I cancelled it for you. 5. I lost it for you. (Are they all grammatical? Would you correct wrong sentences? thank you.)

    asked by rfvv on December 2, 2013
  23. thank u writeacher

    correct sentence: arent these all questions: A)whom needs a ride to the concert? b}for who this letter is? C)whom are we following? D)to who does that dog belong? i choose a.

    asked by henry on July 17, 2009
  24. Physics

    A dog throws a bone into the air at 17.2 m/s...How high will it rise and How long will it take to reach the peak of its trajectory?

    asked by Jeff on October 2, 2012
  25. sentence skills

    how coud you combine the folloing two sentences into one compound sentence? the rabbit jumped into the bushes.the dog followed it.

    asked by nickey on December 19, 2015
  26. math

    Hotel on alyssas dog is 514 inches long this wind is between which two inch marks on a ruler

    asked by zaniya on February 15, 2016
  27. maths

    Ms. Bolt fenced off a corner in her backyard to make a triangular dog pen as shown in the diagram, what is the value of x?

    asked by mazaqman on January 10, 2019
  28. math

    faye has 20 feet of fencing to make a rectangular pen for her dog.What is the largest area she can fence in?

    asked by alex on October 5, 2009
  29. physics

    What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth gR2(R+h)2 gR(R+h) g(R−h)R g(R−h)2R2 2 The instrument used for experimental determination of the value of the universal gravitational

    asked by A on March 14, 2014
  30. Physics ( Calculus & Mecahnics )

    A proton with mass m moves in one dimension.The potential-energy function is where and are positive constants. The proton is released from rest a x0 = a/b. (a) Show that can be written as U(x) = a --- [ ( x0/x )^2 - x0/x ] x0^2 Graph U(x). Calculate U(x0)

    asked by Clark on January 23, 2011
  31. Organic Chemistry

    Hello there! I having trouble understanding the relationship between dipole moment and the heat of formation. How do these two relate; for instance, in the reduction of camphor to isoborneol and borneol? In addition, How does the dipole moment changing for

    asked by John on April 30, 2010
  32. Physics

    A 5.00-kg box is suspended from the ceiling by a cord that is 50.0 cm long. A 10.0-g bullet was fired horizontally with speed at 350 m/s into the box. By how much will the vertical height of the pendulum change? Clue: To get the speed of bullet and box

    asked by Candu on October 5, 2017
  33. Physics

    Consider an isolated system consisting of two masses, each of which has a velocity vector in two dimensions. When these two masses collide the total momentum of the system is conserved. (a) Show that if the total momentum of the system is conserved then

    asked by Tim on March 30, 2014
  34. Physics (please help!!)

    A suitcase of weight mg = 450 is being pulled by a small strap across a level floor. The coefficient of kinetic friction between the suitcase and the floor =0.640 a) Find the optimal angle of the strap above the horizontal. (The optimal angle minimizes the

    asked by Catherine on February 18, 2011
  35. physic

    Hi!could anyone help me with this problem please because I been trying so many time and did not get it. Greatly appreciate it. Thank. A 11.2 g bullet is fired horizontally into a 94 g wooden block initially at rest on a horizontal surface. After impact,

    asked by Chan on November 2, 2009
  36. physics

    A 4.30 kg block is pushed along a floor by a constant applied force that is horizontal and has a magnitude of 43.0 N. The figure gives the block's speed v versus time t as the block moves along an x axis on the floor. The scale of the figure's vertical

    asked by rochelle on September 9, 2015
  37. COLLEGE PHYSICS

    A 62.0 kg skier is moving at 6.50 m/s on a frictionless, horizontal snow covered plateau when she encounters a rough patch 3.50 m long. The coefficient of kinetic friction between this patch and returning to friction-free snow, she skis down an icy,

    asked by Anonymous on June 9, 2010
  38. physics mechanics

    A block weighing 17 N oscillates at one end of a vertical spring for which k = 120 N/m; the other end of the spring is attached to a ceiling. At a certain instant the spring is stretched 0.24 m beyond its relaxed length (the length when no object is

    asked by abu on September 16, 2012
  39. English 9 grammar

    1. Which of the following is grammatically correct? (mixed constructions) A) Even though the boy left early does not mean he was sick. >>B) Even though the boy left early, it does not mean he was sick. 2. Which of the following is grammatically correct?

    asked by Anonymous on July 27, 2015
  40. physics

    a block of mass m=0.9 kg is connected to a spring of force constant k= 775 N/m on a smooth horizontal surface. plot the potential energy of the spring from x= -5 cm to x= 5 cm. determine the turning points of the block if its speed at x= 0 is 1.2 m/s.

    asked by Mima on October 7, 2012
  41. Physics

    A 125-g arrow is shot vertically upward with an initial speed of 28 m/s. Assuming 30% loss in total mechanical energy while ascending, what maximum height above the position from which it was shot does the arrow reach?

    asked by Matt on November 12, 2016
  42. Physics

    "A rocket with mass 1200kg reaches a speed of 300m/s when an explosion breaks it up into two parts with equal mass, and their speeds have a 25m/s difference. What are the speeds and how much energy is released?" Show all work. Thanks!

    asked by Michael on February 3, 2008
  43. physics

    A 29.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 17.00 m. When she is partway down the slide, at a height h2 of 8.00 m, she is moving at a speed of 6.90 m/s. Calculate the mechanical energy lost due to

    asked by Emily on September 30, 2012
  44. Physic II

    A 992.0-g iron meteor impacts the earth at a speed of 1447.0 m/s. If its energy is entirely converted to heat of the meteorite, what will the resultant temperature rise be? (The specific heat for iron is 113 cal/kg.C)

    asked by Guliner on April 7, 2014
  45. Physics (College)

    Driving on asphalt roads entails very little rolling resistance, so most of the energy of the engine goes to overcoming air resistance. But driving slowly in dry sand is another story. If a 1200 kg car is driven in sand at 5.2 m/s, the coefficient of

    asked by Set11 on November 26, 2011
  46. PHYSICS

    Two balls of identical sizes but different masses moving exactly along the same straight line. The left ball (m = 0.5 kg) is moving with a velocity of 2 m/s to the right, and the right ball (m = 0.1 kg) is moving at 0.25 m/s to the right also. The balls

    asked by LESTER on October 17, 2016
  47. Science

    Which of the following best describes the dependent variable in an experiment? A- the variable that is measured B- the variable that is manipulated C- the variable that you can see D- the variable that is most common (My guess is A) Photosynthesis is the

    asked by Skye on September 20, 2014
  48. Physics

    A 940 kg car moves along a horizontal road at speed v0 = 16.8 m/s. The road is wet, so the static friction coefficient between the tires and the road is only μs = 0.196 and the kinetic friction coefficient is even lower, μk = 0.1372. The acceleration of

    asked by Sid on October 26, 2014
  49. Physics

    You are driving a 2570.0-kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin skidding, and the car slides

    asked by Caleb on November 17, 2012
  50. Physics

    A 1400 kg car moves along a horizontal road at speed v0 = 21.4 m/s. The road is wet, so the static friction coefficient between the tires and the road is only μs = 0.127 and the kinetic friction coefficient is even lower, μk = 0.0889. The acceleration of

    asked by AIsh on October 28, 2015
  51. Physics

    You are driving a 2520.0-kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin skidding, and the car slides

    asked by Preston on October 5, 2010
  52. Physics

    A 1200 kg car moves along a horizontal road at speed v0 = 20.1 m/s. The road is wet, so the static friction coefficient between the tires and the road is only μs = 0.189 and the kinetic friction coefficient is even lower, μk = 0.1323. The acceleration of

    asked by Mikayla on November 2, 2016
  53. Physics

    A 1500 kg car moves along a horizontal road at speed v0 = 21.9 m/s. The road is wet, so the static friction coefficient between the tires and the road is only µs = 0.302 and the kinetic friction coefficient is even lower, µk = 0.2114. The acceleration of

    asked by Cody on September 29, 2012
  54. Physics

    You are driving a 2570.0-kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin skidding, and the car slides

    asked by Caleb on November 17, 2012
  55. Physics

    You are driving a 2570.0-kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin skidding, and the car slides

    asked by Caleb on November 17, 2012
  56. Physics

    You are driving a 2530.0-kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin skidding, and the car slides

    asked by sarah on September 13, 2014
  57. physics

    you are driving a 2520.0-kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin skidding, and the car slides

    asked by James on October 13, 2011
  58. physics

    A girl coasts down a hill on a sled, reaching level ground at the bottom with a speed of 6.6 m/s. The coefficient of kinetic friction between the sled's runners and the hard, icy snow is 0.047, and the girl and sled together weigh 755 N. The acceleration

    asked by luma on November 1, 2015
  59. Physics

    When a football in a field goal attemp reaches its max height how does its speed compare to its inital speed? a)it's zero b) it is less than its inital speed c)it is equal to its inital speed d)it is greater than its inital speed since at the max height

    asked by Tammy on September 25, 2007
  60. Physics

    When a football in a field goal attemp reaches its max height how does its speed compare to its inital speed? a)it's zero b) it is less than its inital speed c)it is equal to its inital speed d)it is greater than its inital speed since at the max height

    asked by Tammy on September 26, 2007
  61. statistics

    a person drove on a highway first 5km at a speed of 60km/h ,the second 5km at a speed of 85km/h , third 5km at a speed of 92km/h and last 5km of his journey,the speed was 8okm/h.Use suitable average to find average speed of the journey of 20km.

    asked by Ana on November 10, 2016
  62. physics...PLZ HELP! =)

    A constant force acts on a moving object. The object makes a fixed magnitude of displacement in some direction. In general, in what direction is the displacement that will result in the object traveling with the least kinetic energy after the displacement

    asked by Elizabeth on October 16, 2012
  63. Math

    in a village there are 100 houses. there is a dog in 90 houses, a cat in 80 houses, a rabbit in 75 houses and a turtle in 65 houses. Among those 100 houses, how many, at least, have a dog, a cat, a rabbit, and a turtle?

    asked by Thander on October 18, 2012
  64. Physics

    7.7 mol of helium are in a 16 L cylinder. The pressure gauge on the cylinder reads 65psi. What are (a) the temperature of the gas in Celsius and (b) the average kinetic energy of a helium atom? p=65psi=4.481592E5 p=65psi=4.42atm n=7.7mol v=16=.016m^3 T =

    asked by ana on November 22, 2009
  65. Physics

    When would instantaneous speed be the same as average speed? would it be when the speed is constant? when the position changes linearly with time or would it be in the limit when the time interval goes to zero? I thought it would be when the speed is

    asked by Katie on September 5, 2011
  66. Physics - position time graph

    The graph shows position as a function of time for 2 trains running on parallel tracks. The graph shows line A at a 45 degree angle,beginning at origin. Curve B also begins at origin, continues up and to the right (all in quadrant 1, like a sq root

    asked by Nilan on January 29, 2012
  67. Science HELP!!! FAST!!!

    24. Many people who care about conserving natural resources would choose to use wind energy to power their homes. However, wind power is not an option for people in many parts of the country. Explain what the benefits of wind power are and why it is not

    asked by Agala on February 22, 2017
  68. Physics

    Figure 8-33 shows a 1.50 kg block at rest on a ramp of height h. When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 10.0 cm that has a

    asked by Holy Grail on March 31, 2010
  69. Physics

    Figure 8-33 shows a 1.50 kg block at rest on a ramp of height h. When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 10.0 cm that has a

    asked by Kelly on March 30, 2010
  70. Science(Stuff to do like with magnets!)

    1. A positively charged test object is moving toward the positive source charge in an electric field. What happens next??? A. its potential energy decreases. B. Its potential energy increases. C. Its potential energy stays the same. D. Its potential energy

    asked by Guest user on September 15, 2014
  71. physics

    7. A 2000.0 kg boulder sits on the top of a 50.0 m cliff. As the boulder rolls off, it loses 3.0% of its mechanical energy as heat. How much heat energy goes the boulder lose? How much mechanical energy does the boulder have right before hits the ground?

    asked by henry on December 6, 2009
  72. Physics help please

    The lowest possible energy for a certain positively charged particle trapped in a box is 2.00 eV. (a) What are the next two higher energies a particle can have? b) Is 30 eV an allowed energy? (c) Is 32 eV an allowed energy? (d) Given the box length is

    asked by Sarah on October 21, 2014
  73. health

    I am having difficulty with calculating the energy-yielding nutrients to gram and calories in order to figure out percent of energy contributed by that nutrient.

    asked by Anonymous on June 20, 2014
  74. help

    Estimate the power you deliver when starting to walk from a standstill, in W: & Your body radiates about 88 W in heat energy. How much energy, in J, is radiated in one hour?

    asked by tom on August 24, 2008
  75. chem

    How much energy, in joules, must be absorbed to convert to Na all the atoms present in 1.00mg of gaseous Na? The first ionization energy of Na is 495.8kj/mol .

    asked by tomi on October 26, 2008
  76. science

    Wrap up the meeting with a brief summary of your main points and providing some energy for conserving energy with a memorable slogan, statement, or song, for example.

    asked by candy on January 23, 2008
  77. Chemistry

    Calculate the energy difference (E) for the transition from n = 1 to n = 6 energy levels of hydrogen per 1 mol of H atoms. (Report your answer to at least 3 significant figures.)

    asked by Megan on November 1, 2010
  78. physics

    A LiBr molecule oscillates with a frequency of 1.7×1013 Hz. (a) What is the difference in energy in eV between allowed oscillator states? (b) What is the approximate value of n for a state having an energy of 1.0 eV?

    asked by Austin on November 28, 2013
  79. Chemistry

    Which compound has the highest lattice energy? a) CaO b) LiF c) MgO d) NaF I am guessing B because Lithium has the lowest energy level?

    asked by Anonymous on May 7, 2017
  80. Chemit

    Astronaut receive the energy required in his body by the combustion of 34 g of sucrose per hour how much energy he has to carry along with him to spend one month of 30 days

    asked by Krithika on April 21, 2016
  81. science

    many animal foods like meat and fat are high in energy content. Where did this energy originate. explain by referring to food chains.

    asked by science on June 6, 2018
  82. physics

    use bohr's quantization rule to calculate the energy levels of a hermonic oscillator, for which the energy is (p^2/2m) + (mw^2r^2/2) i.e. force is mw^2y. Restrict yourself to circular orbits.

    asked by kalyan on September 7, 2013
  83. SCI 275

    distinguishes between renewable and nonrenewable energy. · provides at least three methods for conserving energy and helping the environment. · discusses how the government can help with conservation efforts. I need help PLease

    asked by dawn on December 17, 2007
  84. Chemistry

    How much energy in joules is required to change the energy state of the H-atom electron from n=2 to n=3? from n=2 to n=4? from n=2 to infinity? Kind of confused on this concept. Could you please explain for me? Thanks

    asked by Anonymous on August 31, 2015
  85. Science

    Which of the following is a renewable source of energy? A. gasoline B. wind C. natural gas D. coal I am not fully understanding these sources and energy thing...

    asked by Giana on May 1, 2015
  86. Physics

    A proton is moving toward a charge of + 2.8 nC. On its way in to the charge it passes Point B at 4.5 cm from the charge and then passes Point A at 1.2 cm as it gets closer to the charge. a. What is the potential difference between points B and A? b. What

    asked by So Confused on February 10, 2011
  87. physics

    A small block of mass m = 1.1 kg slides, without friction, along the loop-the-loop track shown. The block starts from the point P a distance h = 56.0 m above the bottom of the loop of radius R = 17.0 m. What is the kinetic energy of the mass at the point A

    asked by Katie on March 11, 2012
  88. physics

    A small block of mass m = 1.1 kg slides, without friction, along the loop-the-loop track shown. The block starts from the point P a distance h = 56.0 m above the bottom of the loop of radius R = 17.0 m. What is the kinetic energy of the mass at the point A

    asked by Katie on March 11, 2012
  89. Physics

    A small block of mass m = 1.3 kg slides, without friction, along the loop-the-loop track shown. The block starts from the point P a distance h = 54.0 m above the bottom of the loop of radius R = 19.0 m. What is the kinetic energy of the mass at the point A

    asked by Daniel on December 24, 2013
  90. Physics

    A person slides down a slope. At the end of their slide they are brought gently to rest by a large spring. Friction on the slope cannot be ignored. Draw an energy bar chart for this situation. Define your system any way you want, but clearly state how you

    asked by Daniel on December 9, 2015
  91. Chemistry

    Use an enthalpy diagram to calculate the lattice energy of CaCl2 from the following information. Energy needed to vaporize one mole of Ca(s) is 192 kJ. For calcium, the first IE = 589.5 kJ mol-1, the second IE = 1146 kJ mol-1. The electron affinity of Cl

    asked by Luke on June 29, 2014
  92. Physics

    the energy that can extracted from a storage battery is always less than the energy that goes into it while it is being charged. why?

    asked by jane on February 18, 2013
  93. SCI 275

    To function, ecosystems require an input of energy. Where does this energy come from?

    asked by dawn on November 15, 2007
  94. physics

    how to use the values of total energy and potential energy in a graph?

    asked by g on December 19, 2012
  95. physics

    in a cell voltage energy is converted to current energy and --------.

    asked by barr on March 13, 2008
  96. 3rd grade

    What feature of light energy makes it different from other kinds of energy?

    asked by Casey on April 21, 2009
  97. SCI 275

    To function, ecosystems require an input of energy. Where does this energy come from?

    asked by dawn on November 14, 2007
  98. Physical Science

    Can someone give me two examples of mechanical energy and one example nuclear energy - thanks.

    asked by Carol on December 7, 2009
  99. Science

    What shows how energy is passed each time energy is transferred?

    asked by Shaquille on March 7, 2011
  100. physics

    What are two general types of energy that can be used to classify many forms of energy? Can someone help

    asked by kevin on April 11, 2012

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