1. physics

    Mary weighs 450 N and she walks down a flight of stairs to a level 4.50 m below her starting point. What is the change in Mary's potential energy? 1 J whats the PE formula? and setup?

    asked by Amelia on May 10, 2012
  2. Living Environment

    Could someone please explain what biomass means? Does it just mean how much energy an organism has? http://en.wikipedia.org/wiki/Biomass thanks, Lance!='} what is increased amounts of nitrogen and phosphorus in a lake

    asked by brie on April 29, 2007
  3. physics

    from the first law of thympdynsmics, show that in the isothermal expansion of comprrssion of an ideal gas, the heat energy entering the system is equal to the work done by the gas and that these are RTln(V2- V1)

    asked by uche on June 17, 2013
  4. chemistry

    in a freezer, 150g of water at 0degrees celcius is placed in an ice cube tray. how much energy, in kilocalories, must be removed to form ice cubes at 0 degrees celsius

    asked by bee on January 23, 2014
  5. chemistry

    the frequency factor and activation energy for a chemical reaction ate A=4.8 x 10^-12cm^3 and Ea=11.1kJ/mol at 327 K respectively. Determine the rate constant for this reaction at 327K

    asked by kimberly on November 11, 2014
  6. INTSCIENCE

    The earth can be considered a heat engine because it receives heat from the sun and converts it into mechanical energy to produce winds and evaporate water. True False

    asked by Casey on November 24, 2014
  7. Physics

    I really need you answered this to my email. It's very important, for this may decide my result in the school exams, and I really need a good mark. Unfortunately, Portuguese system of education is full of problems... The question is... The altitude of a

    asked by Frederico Barreto on April 30, 2007
  8. error analyze

    Can you check grammar error in this text? What can you do to reduce global warming in Thailand? Nowadays, The problem global warming is main problem for everybody in the world. It is effect on change of weather that the world have temperature highest. In

    asked by Sophia on April 18, 2015
  9. ecosystems

    How are the flow of matter and the flow of energy through ecosystems different?

    asked by bex on September 10, 2008
  10. Science

    What is energy. Give short definition and give an example

    asked by Bizz on October 16, 2014
  11. physics

    the potential energy of a spring..when stretched by 4 cm is u..when stretched by 20 cm it will ?

    asked by mohit on March 23, 2017
  12. Science

    What does a source of electrical energy do in an electrical circuit?

    asked by Icy Rose on December 14, 2006
  13. Science

    No further energy can be removed from a substance when it is at ____ ____ Please help!

    asked by Anonymous on December 11, 2013
  14. Chemistry

    Among the following electrons, which has highest energy? a. n = 3, l = 2, m = 0, s = + 1/2 b. n = 4, l = 0. m= 0 , s = - 1/s answer is A. but i want to know that how to get this answer help please?

    asked by Shahab Mirza on October 3, 2014
  15. Chemistry

    What is the difference between heat capacity and heat energy?

    asked by Rebecca on April 21, 2012
  16. science

    example of a change in state in state that releases energy

    asked by eduarda on December 12, 2014
  17. CHEMISTRY (ionization energy)

    find the ionization energy of I-, I, and I+ I know you have to use E= hc/lambda, and c=lambda x v, but how do i get v?

    asked by Ferdinand on November 6, 2011
  18. chemistry

    a photon has 3.3 *10-19 joules of energy. what is the wavelength of this photon?

    asked by nina on November 9, 2012
  19. physics

    Sonia walks due east with a speed of two m/s. Bryan walks north with a speed of two m/s. Which statement best describes the relationship between their velocities? A. Their velocities are different because their speeds are not the same. B. Their velocities

    asked by Anonymous on June 13, 2016
  20. Physics

    A worker pushes a 1500 N crate with a horizontal force of 345 N a distance of 24 m. Assume the coefficient of kinetic friction between the crate and the floor is .220. How much work is done by the floor on the crate? -M*g*(mu,k)*X Mg = 1500 N mu,k = 0.220

    asked by Mischa on February 27, 2007
  21. Physics

    In January 2004, NASA landed exploration vehicles on Mars. Part of the descent consisted of the following stages: Stage A: Friction with the atmosphere reduced the speed from 19300km/h to 1600km/h in 4.0min Stage B: A parachute then opened to slow it down

    asked by Anonymous on May 28, 2010
  22. statistics

    A researcher wishes to estimate with 95% confidence the proportion of adults who have high speed internet access. Her estimate must be accurate within 4% of the true proportion. 1. Find the minimum sample size needed using a prior study that found that 48%

    asked by Diana on October 14, 2012
  23. Physics

    suppose you are standing on the edge of a cliff 400 m high and you throw 2 balls in the air: one (ball a) directly upward with a speed of 17.6 m/s and one (Ball b) directly downward with a speed 17.6 m/s. 1.) how high will ball A rise? 2.) How long will it

    asked by Juanita on February 9, 2014
  24. Physics

    suppose you are standing on the edge of a cliff 400 m high and you throw 2 balls in the air: one (ball a) directly upward with a speed of 17.6 m/s and one (Ball b) directly downward with a speed 17.6 m/s. 1.) how high will ball A rise? 2.) How long will it

    asked by Juanita on February 9, 2014
  25. Physic

    A 25 kg box is set on a flat surface with us=0.62 and uk=0.49. A force of 100N is applied to the box through a rope which makes and angle of 30 degrees with the horizon. (a)what's the component of Fa that is attempting to move the box sideways? (b) what's

    asked by Elaine on March 3, 2017
  26. Physics

    A ninety kilogram sofa is being pushed by four meters to the other side of a hall. After an initial push the sofa is pushed with a 600 N force. In this case, 0.6 is the coefficient of kinetic friction. What would be the magnitude and direction of the

    asked by Anonymous on October 12, 2016
  27. physics

    If the mass of the skier is 50 kg, what is the magnitude of the force of kinetic friction on the skier? Be sure to show your work, and use g = 10 m/s^2 for the magnitude of acceleration due to gravity. Sin 30degrees = 1/2 Cos 30degrees = square root 3/4

    asked by rob on October 27, 2014
  28. PHYSICS

    The object of the long jump is to launch oneself as a projectile and attain the maximum horizontal range (Fig. 3–26). Here we shall treat the long jumper as a particle even though the human body is fairly large compared to the size of the trajectory.

    asked by Anonymous on May 19, 2013
  29. PHYSICS

    The object of the long jump is to launch oneself as a projectile and attain the maximum horizontal range (Fig. 3–26). Here we shall treat the long jumper as a particle even though the human body is fairly large compared to the size of the trajectory.

    asked by Anonymous on May 19, 2013
  30. PHYSICS

    The object of the long jump is to launch oneself as a projectile and attain the maximum horizontal range (Fig. 3–26). Here we shall treat the long jumper as a particle even though the human body is fairly large compared to the size of the trajectory.

    asked by Anonymous on May 19, 2013
  31. physics

    A horizontal spring with spring constant 73.2 N/m is compressed 16.7 cm and used to launch a 2.42 kg box across a frictionless, horizontal surface. After the box travels some distance, the surface becomes rough. The coefficient of kinetic friction of the

    asked by amy on October 31, 2009
  32. Physics

    A ball with a mass of 0.50 kilograms is moving at a speed of 1.8 meters/second along the positive x-axis. It collides with another ball of the same mass travelling at a speed of 2.0 meters/second toward the positive y-axis. Both balls then start moving

    asked by fredrick on March 13, 2013
  33. math

    John leaves on a 20-mile bike trip. He rides at a speed of 8 mile per hour. Ashley leaves 1 hour later. Both bikers take the same route. Ashley rides at a speed of 6 miles per hour. How many later than John will Ashley complete the trip?

    asked by Anonymous on May 12, 2016
  34. Math

    Ms. Peters drove from her home to the park at an average speed of 30 miles per hour and returned home along the same route at an average speed of 40 miles per hour. If her driving time from home to the park was 20 minutes, how many minutes did it take Ms.

    asked by Malachi on February 12, 2015
  35. Math

    The distance between Town A and Town B was 210 km. At 9:20 P.M., a bus set off from Town A to Town B and a car left from Town B to Town A. The average speed of the bus was 60 km/h, and the average speed of the car was 80km/h. a) Calculate the time at which

    asked by Brody on April 29, 2016
  36. Calculus

    An open hemispherical bowl of radius R is slowly draining through a small hole of radius r in the bottom of the bowl. Let g be the acceleration due to gravity and y be the depth of the water (which means the distance from the water surface to the hole).

    asked by chamy on April 8, 2012
  37. physics

    A snowball rolls of a roof by accident. The roof is sloped 40.0 o relative to the horizontal. The edge of the roof is 14.0 m above the ground, and the speed of the snowball is 7.00 m/s as it rolls off the roof. Ignore air resistance. Coincidentally, there

    asked by tamara on February 21, 2016
  38. physics

    A snowball rolls of a roof by accident. The roof is sloped 40.0 o relative to the horizontal. The edge of the roof is 14.0 m above the ground, and the speed of the snowball is 7.00 m/s as it rolls off the roof. Ignore air resistance. Coincidentally, there

    asked by tom on February 23, 2016
  39. PHYSICS!!!

    A liquid (ñ = 1.65 g/cm3) flows through a horizontal pipe of varying cross section as in the figure below. In the first section, the cross-sectional area is 10.0 cm2, the flow speed is 288 cm/s, and the pressure is 1.20 105 Pa. In the second section, the

    asked by k on November 11, 2012
  40. physics

    Shoes made for the sports of bouldering and rock climbing are designed to provide a great deal of friction between the foot and the surface of the ground. Such shoes on smooth rock might have a coefficient of static friction of 1.2 and a coefficient of

    asked by xxx on September 27, 2015
  41. Physics- Elena please help!

    A digital audio compact disc carries data along a continuous spiral track from the inner circumference of the disc to the outside edge. Each bit occupies 0.60 mm of the track. A CD player turns the disc to carry the track counter-clockwise above a lens at

    asked by Anonymous on October 29, 2012
  42. physics question

    Same rental cars have a GPS unit installed, which allows the rental car company to check where you are at all times and thus also know your speed at any time. One of these rental cars is driven by an employee in the company's lot and during the time

    asked by himel on August 17, 2016
  43. physics .Henry,Damon,Steve,Saed,bobpursley, And This is my question every one

    Same rental cars have a GPS unit installed, which allows the rental car company to check where you are at all times and thus also know your speed at any time. One of these rental cars is driven by an employee in the company's lot and during the time

    asked by himel on August 21, 2016
  44. English

    Read each sentence then write each transitive verb. if a sentence has no transitive verb(direct object) write none. Example: Jamie watered the plants in the sunroom. Answer: watered transitive 1. Molly hammered the final nail hammered Transitive 2.The snow

    asked by Jerald on October 8, 2012
  45. Physics

    a) A cannonball is fired horizontally from the top of a cliff. The cannon is at height H = 100 m above ground level, and the ball is fired with initial horizontal speed v_0. Assume acceleration due to gravity to be g = 9.80 m/s^2. Assume that the cannon is

    asked by Sam on September 26, 2008
  46. physics grade 11 one word term

    one word/term. 1.3.The minimum amount of energy required to start a reaction. 1.4.The distance between the centre of a lens and its focal point. 1.5. The type of image formed on a screen when light rays converge.

    asked by marcia on September 27, 2011
  47. chemistry

    Which of the following is a situation where an object’s potential energy varies as a result of changes due to its chemical composition? The melting of ice. The burning of wood. A ball rolling down a hill. A parachute slowing a skydiver's fall.

    asked by k on January 29, 2012
  48. Social Studies

    1:Which type of economies do all African countries have? A: Traditional B: Mixed C: Market*** D: Command 2:Nigeria’s economy is almost entirely dependent upon ___? A: Energy Production B: Agriculture*** C: Service Industries D: Manufacturing Cheak my

    asked by PadraigDiggory on February 14, 2019
  49. Biology

    Which of the following mutations would you expect to have the greatest effect on a living cell? A. A mutation that changes a single base in a region of noncoding DNA B. Energy release from plutonium C. Consumptions of preexisting organic compounds Im

    asked by Matt on February 25, 2013
  50. physics 113

    Calculate the change in internal energy of 2kg of water at 90 degree celcius when it is changed to 3:30m3 of steam at 100oC. The whole process occurs at atmospheric pressure. The latent heat of vaporization of wat

    asked by Anonymous on February 27, 2015
  51. Physics

    An engineer claims to have measured the characteristics of a heat engine that takes in 130J of thermal energy and produces 40J of useful work. What is the smallest possible ratio of the temperatures (in kelvin) of the hot and cold reservoirs?

    asked by Mike on December 10, 2010
  52. Physics

    A 400 kg baby grand piano is raised to the roof of a 100 m building. If the cable breaks as it reaches this height, what will its velocity be the instant prior to impact? Use energy considerations and verify using kinematics.

    asked by BA on December 8, 2012
  53. Physics

    3. Calculate the amount of gravitational potential energy at the top of each hill and at the bottom of each valley. Be sure to convert your distance measurements to meters.Use an approximated value of 58.0 g for the mass of the tennis ball, and 9.81 m/s2

    asked by bb on February 25, 2018
  54. Biology

    Which of the following mutations would you expect to have the greatest effect on a living cell? A. A mutation that changes a single base in a region of noncoding DNA B. Energy release from plutonium C. Consumptions of preexisting organic compounds Im

    asked by Matt on February 24, 2013
  55. Need help badly, Science

    Suppose the incident sunlight at ground level has a power density of 0.87 kW m−2 at noon. What is the maximum rate of loss of water from a lake of area 1.0 ha? (1 ha = 104 m2.) Assume that all the radiant energy is absorbed. any ideas on how do i get

    asked by Xavier on September 28, 2014
  56. Environmental Science

    If global energy policies lead to stabilisation of CO2 concentrations at 660 p.p.m., what would the resulting increase in GMST be (to one decimal place)? In subsequent parts of the question this is referred to as the UN’s ‘de facto temperature

    asked by Paul on July 11, 2011
  57. science

    1.Explain how scientists work together to forecast hurricanes? 2.What damage can occur from a storm surge? 3. where does a tropical strom get its energy? 4. Which statment BEST describes a hurricane? A.Its wind are at least 119km per hour OR B. It forms

    asked by angel on December 3, 2007
  58. Social Studies

    1:Which type of economies do all African countries have? A: Traditional B: Mixed C: Market D: Command A or C 2:Nigeria’s economy is almost entirely dependent upon ___? A: Energy Production B: Agriculture C: Service Industries D: Manufacturing B or D

    asked by PadraigDiggory on February 14, 2019
  59. sci

    Replacing pillage and destruction, “going-green” seems to be today’s top advocacies among business establishments in taking part for promoting energy conservation and environmental friendly themes. Do you think we’d ever have a time when this

    asked by meshelle on May 27, 2011
  60. physics

    A capacitor,consisting two metal plates each of area 50cm2 and spaced 0.2mm apart in air ,is connected across a 120V supply.Calculate (1)the energy stored (2)the ekectric flux density and the potential gradient..

    asked by Anonymous on February 13, 2016
  61. physics

    A capacitor,consisting of two metal plates each of area 50cm2 and space 0.2mm apart in air ,is connected across a 120V supply.Calculate (1)the energy stored..(2)the electric flux density and the potential gradient..

    asked by jonathan on February 13, 2016
  62. Physics

    A particle of mass m = 27 g slides inside a bowl whose cross section has circular arcs at each side and a flat horizontal central portion between points a and b of length 30 cm (Fig. 7-23). The curved sides of the bowl are frictionless, and for the flat

    asked by Lilian on October 19, 2013
  63. Math (Help)!

    I'm lost on where to begin with the problem... Someone help explain how the problem should be done. An indoor physical fitness room consists of a rectangular region with a semicircle on each end. The perimeter of the room is to be a 200-meter single-lane

    asked by Amy on September 29, 2015
  64. Chemistry

    I have this question in front of me concerning Methanol (CH3OH) & how geseous methanol is formed via the following thermochemical equation: CO(g)+2H2(g)¡êCH3OH(g)∆H=-90kJ . Now, it asks me (explanations should show a clear understanding of how Le

    asked by Travis on February 7, 2007
  65. Physics

    On a 20 degree Celsius day, a hot air balloon is estimated to lift 600 kg to carry you, two friends, the operator and his dog, along with the weights of the balloon and some food and drinks. That means that the hot air in the balloon has to be somehow 600

    asked by Celine on January 18, 2019
  66. CONFUSING!

    1.A woman rides a carnival Ferris wheel at radius 15 m, completing five turns about its horizontal axis every minute. What are (a) the period of the motion, the (b) magnitude and (c) direction of her centripetal acceleration at the highest point, and the

    asked by Amber on October 1, 2006
  67. Physics

    PLEASE HELPPP! An ice skater hits a patch of rough ice. The rough patch has a kinetic coefficient of friction with her skates of 0.13. The skater's mass is 51 kg. She passes over the rough patch in 0.55 s. What impulse does the rough patch of ice give her?

    asked by Asia on December 7, 2011
  68. Physics

    Ok the problem I'm doing has two parts I know how to do part a and got the right answer I think... I do not know how to do part b Here's the problem A student driver wants to make his car jump over 8 cars parked side by side below a horizontal ramp (a)With

    asked by Physics on July 5, 2009
  69. SCI/275

    Hello, I would like for someone to read my Final for my class SCI/275. The assignment is: Final Project: Mitigation Strategies and Solutions (Due Sunday in the Assignment Section of eEcampus) • Resource: Appendix A • Use the topic you chose as an

    asked by Cindy on September 2, 2010
  70. physics

    You are on an airplane traveling 30° south of due west at 130.0 m/s with respect to the air. The air is moving with a speed 31.0 m/s with respect to the ground due north. 1) What is the speed of the plane with respect to the ground? 2) What is the heading

    asked by ali on September 10, 2012
  71. Displacement and Velocity

    A turtle moves 3.5m [E] in 136 s and then moves 1.7m [W] in 88 s. a) What is the average speed of the turtle? b) What is the average velocity of the turtle? average speed: D/T = 3.5m + 1.7m = 5.2m/ 224s = 0.024m/s average velocity:??????????/

    asked by Anonymous on November 13, 2010
  72. science

    The total power output of the Sun is about 3.8 × 1026 W, and the power-producing core has a radius of about 1.4 × 105 km (about 20% of the full radius of the Sun). Using these figures and your knowledge of the energy release in the proton– proton chain

    asked by mj on August 24, 2011
  73. Algebra

    This question deals with Exponential Growth and Decay Test. Question:Consider the following:Start by tossing 30 dice. Then remove the dice that show 5s and 6s and toss the remaining dice. Repeat this process until you only have 2 dice remaining. The data

    asked by Mary on January 17, 2010
  74. Biochemistry

    The kinetic parameters of the reaction of lactate to pyruvate can be measured by following the formation of NADH from NAD+. It can also be measured in the reverse direction, however, at high concentrations of NADH the reaction cannot be monitored at 340

    asked by Student on November 20, 2016
  75. Physics

    A 10-g fridge magnet is supposed to hold a 2.0-g paper on the stainless steel fridge door. The normal force of 0.19 N is insufficient to keep them in place, and the paper and magnet accelerate down the fridge at 0.150 m/s2 when the fridge door is slammed.

    asked by Trex on March 22, 2015
  76. Physics

    Calculate the force required to pull a copper ball of radius 2.00 cm upward through a fluid at the constant speed 9.00 cm/s. Take the drag force to be proportional to the speed, with proportionality constant 0.950 kg/s. Ignore the buoyant force.

    asked by Jean on March 1, 2007
  77. Physics

    A person must move two heavy packages over a surface level so they place a 20kg package over a 30kg package and decide to move them together. The coefficient of kinetic friction between the lower package and the ground is 0.3. The person exerts a force of

    asked by Alex on April 2, 2008
  78. Physics

    A person must move two heavy packages over a surface level so they place a 20kg package over a 30kg package and decide to move them together. The coefficient of kinetic friction between the lower package and the ground is 0.3. The person exerts a force of

    asked by Alex on April 2, 2008
  79. Algebra--please help!

    Here's my question. Please walk me through it so I can fully understand it. Jon begins jogging at a steady 3 meters/sec down the middle of Lane #1 of a public track. Laaura starts even with him in the center of Lane #2 but moves at 4 meters/sec. At the

    asked by Caroleen on January 7, 2009
  80. Urgent algebra help!

    Here's my question. Please walk me through it so I can fully understand it. Jon begins jogging at a steady 3 meters/sec down the middle of Lane #1 of a public track. Laaura starts even with him in the center of Lane #2 but moves at 4 meters/sec. At the

    asked by Caroleen on January 7, 2009
  81. English

    Which of the following sentences shows an example of parallel verbs? A. Once the game was over, Jim had to be running home and eat dinner. B. Once the game was over, Jim had to run home and dinner was ready. C. Once the game was over, Jim had to run home

    asked by Diana on April 9, 2015
  82. English

    Which of the following sentences shows an example of parallel verbs? A. Once the game was over, Jim had to run home and then eat his dinner. B. Once the game was over, Jim had to run home and dinner was ready. C. Once the game was over, Jim had to be

    asked by debbie on May 31, 2015
  83. writeacher

    In the short story, “The Most Dangerous Game” by Richard Connell, the author uses setting details to create suspense in the story. The story takes places in a tropical island in the Caribbean Sea known as “Ship-Trap Island.” An island where Sailors

    asked by Reina B. V on December 31, 2013
  84. physics!!!

    A copper rod is given a sharp compressional blow at one end. The sound of the blow, traveling through air at -2.79 degrees Celsius, reaches the opposite end of the rod 9.39ms later than the sound transmitted through the rod. What is the length of the rod?

    asked by Ashleigh on November 8, 2010
  85. science

    heat and sound products electric and heat products kinetic and heat products ex.electric and sound ipod mp3 wii laptop tv please help!

    asked by energy on March 10, 2011
  86. Physics

    What is the maximum mass of a rubber block that can be pulled by a rope whose maximum tension is 3500N? The block is sitting on dry asphalt. (By the way, 1.2 would be used as the coefficient of static friction and 0.8 is the coefficient of kinetic friction

    asked by Kid on April 27, 2016
  87. math

    you are trying to cool your house. The temp in the house is 85. Your ac is set for 78. The outside temp is 71. Which will cool the house the fastest leaving the windows open or leaving the windows closed? With the AC running, it will be better to open the

    asked by manoj on March 17, 2007
  88. physics.

    Heat engine X takes four times more energy by heat from the hot reservoir than heat engine Y. Engine X delivers two times more work, and it reject seven times more energy by heat to the cold reservoir than heat engine Y. Find the efficiency of heat engine

    asked by jean on April 26, 2007
  89. Physics

    The coefficients of static and kinetic friction between a 476 N crate and the ware house floor are 0.615 abd 0.420, repectively. A worker gradually increases his horizontal push against this crate utnil it just begins to move and from them on maintains

    asked by Sarah on June 15, 2009
  90. Animal Art

    1. Which of the following statements regarding the use of pastels with other mediums is true? A. Pastels should never be used for accents in a watercolor painting. B. An artist can effectively add charcoal over a pastel rendering. C. Pastel tends to deaden

    asked by Erin on March 27, 2007
  91. Physics 203

    A spring has its right end fixed and is installed on a horizontal table so that the free end, at equilibrium, is at x=3.00m. A 1.65kg block coming from the left slides along the table. When it passes the origin, it is moving at 5.58m/s. It strikes the

    asked by Dorian on April 3, 2016
  92. Math--Check my answers

    Choose the word phrase that can be represented by 2 – p. the difference of a number p and 2 the quotient of 2 and a number p 2 more than a number p 2 decreased by a number p **** Which word phrase could represent the variable expression 1/2 a + 4? 4 more

    asked by Anonymous on September 24, 2014
  93. math

    David Salter has a personal automobile policy ( PAP) with coverage of $ 25,000/$ 50,000 for bodily injury liability, $ 25,000 for property damage liability, $ 5,000 for medical payments, and a $ 500 deductible for collision insurance. How much will his

    asked by tota on June 8, 2014
  94. physics

    hi every one i appreciate help as ineed answer as soon a jetplane discharges a jet at rate of 28kg/s with a velocity of 950 m/s relative to the plane if the forward speed of the plane is 875km/h what is the thrust developped on the plane and the power

    asked by georgie on December 15, 2012
  95. physics

    A 358-kg boat is sailing 15.9° north of east at a speed of 1.80 m/s. Thirty seconds later, it is sailing 36.6° north of east at a speed of 3.68 m/s. During this time, three forces act on the boat: a 29.7-N force directed 15.9° north of east (due to an

    asked by Jasmin on September 23, 2011
  96. Physics

    A 325-kg boat is sailing 15.0° north of east at a speed of 2.00 m/s. Thirty seconds later, it is sailing 35.0° north of east at a speed of 4.00 m/s. During this time, three forces act on the boat: a 31.0-N force directed 15.0° north of east (due to an

    asked by Litany on November 13, 2009
  97. Physics

    A 343-kg boat is sailing 16.2° north of east at a speed of 1.98 m/s. Thirty seconds later, it is sailing 37.5° north of east at a speed of 3.76 m/s. During this time, three forces act on the boat: a 30.3-N force directed 16.2° north of east (due to an

    asked by Natasha on February 12, 2012
  98. Physics

    A 325-kg boat is sailing 15.0° north of east at a speed of 2.00 m/s. Thirty seconds later, it is sailing 35.0° north of east at a speed of 4.00 m/s. During this time, three forces act on the boat: a 31.0-N force directed 15.0° north of east (due to an

    asked by Litany on November 13, 2009
  99. Physics

    A blue ball is thrown upward with an initial speed of 19.6 m/s, from a height of 0.5 meters above the ground. 2.4 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 7.9 m/s from a height of 22.1 meters above the

    asked by Cam on February 2, 2014
  100. Physics

    A 358-kg boat is sailing 15.9° north of east at a speed of 1.80 m/s. Thirty seconds later, it is sailing 36.6° north of east at a speed of 3.68 m/s. During this time, three forces act on the boat: a 29.7-N force directed 15.9° north of east (due to an

    asked by Jasmin on September 22, 2011

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