1. DrBob222

    How fast should a car move toward you for the car's horn to sound 2.88% higher in frequency than when the car is stationary? The speed of sound is 343 m/s. I don't know what equation to use. I think I'm suppose to use this: fs(v-vd/v-vs) I know I got it

    asked by Jon on April 5, 2008
  2. Physics

    A 3.5 kg object is suspended from a spring of spring constant 725 N/m. Starting from the equilibrium position, the object has an initial speed of 7.9 m/s. What is the maximum displacement of the object during its subsequent motion? (In cm)

    asked by c on February 26, 2008
  3. physics

    A 900 kg car rolling on a horizontal surface has speed v = 55 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.2 m. What is the spring stiffness constant of the spring?

    asked by Anonymous on November 3, 2010
  4. distance problem

    A car travels 20 km/h faster than a truck. The car covers 360 km in 3 hours less time than the truck.Find the speed of the truck. (kindly write the solution, thanks alot)

    asked by HELP HELP MNHS on December 17, 2012
  5. Physics

    A bullet is fired from a rifle that is held 1.70 m above the ground in a horizontal position. The initial speed of the bullet is 1078 m/s. Calculate the time it takes for the bullet to strike the ground.

    asked by Julia on October 19, 2015
  6. physics

    the initial velocity of a 4 kg box is 11 m/s, due west. after the box slides 4 m horizontally its speed is 1.5 m/s. determine the magnitude and the direction of the non conservative force acting on the box as it slides.

    asked by bryan on December 16, 2012
  7. Calc

    A plane flying horizontally at an altitude of 2 mi and a speed of 420 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 5 mi away from the station.

    asked by Callie on October 13, 2015
  8. Math

    A plane flys 230 km due north. The wind is blowing west at 85 km. what direction is the plane flying. Calculate the actual speed of the plane. What is the hearing from North?

    asked by Georgia on September 14, 2015
  9. Calculus

    A spotlight on the ground is shining on a wall 12m away. If a woman 2m tall walks from the spotlight toward the building at a speed of 0.6m/s, how fast is the length of her shadow on the building decreasing when she is 2m from the building?

    asked by Kate on October 30, 2013
  10. college physics

    A 1300 kg car rolling on a horizontal surface has speed v = 65 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.9 m. What is the spring stiffness constant of the spring?

    asked by Anonymous on February 28, 2010
  11. chemistry

    A proton beam is made by accelerating protons in a high voltage electric field. The protons have a velocity of 2.75 x 107 m/s. What is the wavelength of the protons traveling at this very high speed?

    asked by Shell on May 19, 2011
  12. Physics

    The athlete shown in the figure rotates a 1.00 kg discus along a circular path of radius 1.07 m. The maximum speed of the discus is 19.0 m/s. Determine the magnitude of the maximum radial acceleration of the discus.

    asked by Snooki on February 5, 2011
  13. Science

    An object travels 8 m in the 1st second of travel, 8 m again in the 2nd second of travel, and 8 m again during the 3rd second of travel. its acceleration in meters per second per second is? Would the answer to this question be 0? I'm not positive, but

    asked by Anonymous on March 8, 2007
  14. Math

    A plane flys 230 km due north. The wind is blowing west at 85 km. what direction is the plane flying. Calculate the actual speed of the plane. What is the hearing from North?

    asked by Georgia on September 13, 2015
  15. Physics

    An airplane flies due south at 185 km/h relative to the air. There is a wind blowing at 68 km/h to the east relative to the ground. What are the plane's speed and direction relative to the ground?

    asked by Noah on December 3, 2012
  16. Physics

    A building superintendent twirls a set of keys in a circle at the end of a cord. If the keys have a centripetal acceleration of 115 m/s2 and the cord has a length of 0.36 m, what is the tangential speed of the keys?

    asked by Carol on October 29, 2010
  17. Math

    A trip from Ohio to new york is 529 miles. what equations show the times t it takes by car if r is the average speed during the trip? t=529/r*** t=529r r=529t t=r/529

    asked by tyler on May 10, 2018
  18. Physics

    A 55-kg packing crate is pulled with constant speed across a rough floor with a rope that is at an angle of 41.0 ∘ above the horizontal. If the tension in the rope is 195 N , how much work is done on the crate by the rope to move it 3.0 mm ?

    asked by Amanda on November 9, 2015
  19. math

    The 7 inch diameter drive drum of a belt conveyor is turning at 130 rpm. What is the belt speed (ft/min) if there is no slip between the belt and drum? What are the steps to figures this out? Thank you for your help.

    asked by Sushmitha on March 29, 2012
  20. Calculus

    A plane flying horizontally at an altitude of 2 mi and a speed of 420 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 5 mi away from the station.

    asked by Callie on October 13, 2015
  21. physics

    A 15 kg crate is pulled at constant speed a distance d= 5.7m up a frictionless ramp, to a height h of 2.5 m above its starting point. a) What force F must the cable exert on the crate? b) How much work is done on the crate by the force F?

    asked by Meagan on November 2, 2017
  22. Calculus

    A street light is at the top of a 17 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 6 ft/sec. How fast is the tip of her shadow moving when she is 50 ft from the base of the pole.

    asked by Nathan on October 8, 2013
  23. physics

    The initial velocity of a 4.0-kg box is 11 m/s, due west. After the box slides 4.0 m horizontally, its speed is 1.5 m/s. Determine the magnitude and the direction of the non-conservative force acting on the box as it slides

    asked by Anonymous on February 16, 2010
  24. physics

    what is the minimum initial speed of the dart if it is to hit the monkey before the monkey hits the ground, which is 14.2 m below the initial position of the monkey, if x is 47 m and h = 13 m? (Ignore any effects due to air resistance.)

    asked by Anonymous on October 21, 2011
  25. physics

    A 1100 kg car rolling on a horizontal surface has speed v = 70 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.2 m. What is the spring stiffness constant of the spring?

    asked by asia on January 11, 2010
  26. physics

    A 1300-kg car rolling on a horizontal surface has speed v = 65 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.3 m. What is the spring stiffness constant of the spring?

    asked by Justin on March 3, 2010
  27. Physics/Math

    A 3.0 kg block, initially in motion, is pushed along a horizontal floor by a force F of magnitude 18 N at an angle = 45° with the horizontal. The coefficient of kinetic friction between the block and floor is 0.25. (Assume the positive direction is to the

    asked by COFFEE on February 10, 2007
  28. Chem

    The best solar panels currently available are about 13% efficient in converting sunlight to electricity. A typical home will use about 40. kWh of electricity a day. Assuming 8 hours of useful sunlight per day, calculate the minimum solar panel surface area

    asked by Joe on October 20, 2006
  29. Physics

    an object is dropped from rest the top of a building 19.6 m hi. calculate the a) time for the object to reach the ground and b) object's speed just before it strikes the ground

    asked by Rocio on April 5, 2016
  30. Physics

    A sprinter accelerates at 4 m/s2 for 3 seconds, and then runs the rest of the race at a constant speed. If the race is 100 m, how much time does the sprinter take to fi nish the race?

    asked by Bob on February 11, 2011
  31. Physics

    What is the average linear speed of Mercury about the Sun? (The distance from the Sun to Mercury is 5.80 1010 meters. The orbital period around the Sun is 88 days.)

    asked by Dante on October 9, 2007
  32. physics

    If you can throw a ball vertically upward to a height h = 19.7 m, what is the maximum horizontal range over which you can throw the same ball, assuming you throw it at the same initial speed?

    asked by Michael on September 19, 2013
  33. physics

    A car coasts (engine off) up a 30 degree grade. If the speed of the car is 25m/s at the bottom of the grade, what is the distance traveled by the car before it comes to rest?

    asked by Lorraine on September 16, 2012
  34. math

    One car went 10 miles farther when traveling at 50 mph than a second car that traveled 2 hours longer at a speed of 40 mph. How long did the first car travel?

    asked by Anonymous on April 9, 2016
  35. physics

    A car travels at a constant speed around a circular track whose radius is 2.66 km. The car goes once around the track in 200 s. What is the magnitude of the centripetal acceleration of the car?

    asked by Tyler on January 26, 2017
  36. math

    One car went 10 miles farther when traveling at 50 mph than a second car that traveled 2 hours longer at a speed of 40 mph. How long did the first car travel?

    asked by Anonymous on April 9, 2016
  37. physics!!!

    The viscous force on an oil drop is measured to be 6.0 10-13 N when the drop is falling through air with a speed of 9.0 10-4 m/s. If the radius of the drop is 2.5 10-6 m, what is the viscosity of air? Answer in N x s/m^2

    asked by k on November 11, 2012
  38. physics

    A car travels at a constant speed around a circular track whose radius is 2.87 km. The car goes once around the track in 332 s. What is the magnitude of the centripetal acceleration of the car?

    asked by BrookeNeed on October 31, 2016
  39. physics

    A shot-putter launches a 7.5 kg shot with a speed of 12 m/s at an angle of 37 degrees above horizontal. If, upon release, the shot was 2.0 m above the ground, determine the horizontal range.

    asked by Anonymous on January 26, 2012
  40. physics

    Lauren is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling up the hill at all. What would her speed at the bottom need to be? 50 m/s 71 m/s 7.1 m/s 240 m/s

    asked by natali on January 19, 2013
  41. Physics

    A car travels at a constant speed around a circular track whose radius is 2.9 km. The car goes once around the track in 380 s. What is the magnitude of the centripetal acceleration of the car?

    asked by Angela on October 23, 2010
  42. physics

    Lauren is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling up the hill at all. What would her speed at the bottom need to be? 50 m/s 71 m/s 7.1 m/s 240 m/s

    asked by natali on January 19, 2013
  43. physics

    A car travels at a constant speed around a circular track whose radius is 2.60 km. The car goes once around the track in 344 s. What is the magnitude of the centripetal acceleration of the car?

    asked by Joe on February 13, 2012
  44. Physics

    A car travels at a constant speed around a circular track whose radius is 2.5 km. The car goes once around the track in 430 s. What is the magnitude of the centripetal acceleration of the car?

    asked by Tasha on April 2, 2008
  45. physical science

    A car travels at a constant speed around a circular track whose radius is 3.5 km.The car goes once around the track in 400 s.What is the magnitude of the centripetal acceleration of the car?

    asked by nalim on December 16, 2015
  46. Physics

    What is the force at which a bowling ball when it sticks the pins given the final speed of the bowling ball. Now account for friction and angular rotation of the ball

    asked by Ron on July 3, 2012
  47. PHYSICS

    A car travels at a constant speed around a circular track whose radius is 3.1 km. The car goes once around the track in 280 s. What is the magnitude of the centripetal acceleration of the car?

    asked by Joshua on September 30, 2010
  48. Physics

    During an auto race, a car with a speed of 85m/s acceleration passed another car rate of 4.0m/s^2 for 3.5s. How far does the car travel during this time? Okay so I used D= Vi-t+(1/2)t^2 D= 85m-4.0m/s^2+(1/2)3.5^2 D= 87.125 ?

    asked by Math CAN Y0U CHECK MY WORK? on September 28, 2016
  49. physics

    object moving w/ speed 1.27m/s rolls off a cliff and hits water .75m from end of cliff. how high above water is the cliff?? not sure what to do here

    asked by ineedhelp on January 19, 2008
  50. Physics

    a glass beaker will break if it hits the ground with a speed of 2.0 m/s or more. A cat pushes the beaker causing it to fall 15.0 cm to the floor. will the beaker break?

    asked by cally on August 22, 2012
  51. Physics

    What is the average linear speed of Mercury about the Sun? (The distance from the Sun to Mercury is 5.80 1010 meters. The orbital period around the Sun is 88 days.)

    asked by Melanie on February 1, 2016
  52. physics

    Given the amplitude of a wave and the wabelength how to you find the period? The problem then goes on and asks me how to find the speed which I know how to do I just don't know how to find the period... Please show me how to do and the formulas to use

    asked by HELP ME! on May 17, 2009
  53. physics

    the tennis ball may leave the racquet on the serve with a speed of 65 m/s. If the ball's mass is 60 g, and it is in contact with the racquet for .030 s, what is the average force on the ball?

    asked by Sammy Palmisano on January 31, 2011
  54. physics

    A 30 kg person climbs up a 5 m rope at a constant speed. If the student’s power output is 2 kW, how long does it take for the student to climb the rope? How much work does the student do?

    asked by Anonymous on February 7, 2011
  55. Physics

    What is your speed at the bottom of the "frictionless" Tornado water slide at Great America if the height of the slide is 34.0 meters and the length of the slide is 44 meters?

    asked by Anonymous on April 12, 2012
  56. Physics

    A car travels at a constant speed around a circular track whose radius is 2.5 km. The car goes once around the track in 430 s. What is the magnitude of the centripetal acceleration of the car? m/s2

    asked by Will G on April 2, 2008
  57. physics

    A diver jumps from a height of 24.0m into a swimming pool. What's her speed when she enters the water? (21.7m/s) if the diver stops after sinking 3m into the water, what's the acceleration in the water? (78.4m/s^2)

    asked by Sammeh on November 14, 2009
  58. Physics

    A 60-kg soccer player kicks a stationary 0.4 kg ball giving it a speed of 14 m/s. The player's foot is in contact with the ball for 0.08 second. What is the average force on the ball?

    asked by Julie on August 31, 2015
  59. Physics

    An Earth satellite moves in a circular orbit at a speed of 5800 m/s. a)What is the radius of the satellite's orbit? b) What is the period of the satellites orbit in hours?

    asked by Natalie on October 23, 2012
  60. Physics

    A boy on a swing reaches a maximum height of 3.2 m and a minimum height of .55 m. What is the speed of the boy at the lowest point if the boy has a mass of 34 kg? v(final)=?

    asked by Tori on January 28, 2016
  61. physics

    An object is thrown upwards and after 2 seconds is 78 m above where it was initially thrown. Assume no air resistance, and determine the initial speed the object was thrown at.

    asked by Cassandra on February 21, 2012
  62. physics

    Mouse steals piece of cheese by rolling across the floor with a force of 5.0 N. With what acceleration does the cheese move? At what speed is the cheese rolling after 10 seconds?

    asked by Abby on November 9, 2010
  63. physics

    A water tank springs a leak. Find the speed of water emerging from the hole if the leak is 2.5 m below the surface of the water, which is open to the atmosphere.

    asked by aok on December 7, 2010
  64. Physcis

    You are traeling back and forth on a 10m straight lane. You go forth in 10 sec and back in 4 seconds,forwards again in 5 s and back again in 1 seconds. what is ur displacement. and what is your average speed

    asked by Yes on March 15, 2015
  65. Physics

    A car travels at a constant speed around a circular track whose radius is 2.59 km. The car goes once around the track in 380 s. What is the magnitude of the centripetal acceleration of the car?

    asked by Emily on March 29, 2016
  66. physics

    A car travels at a constant speed around a circular track whose radius is 2.1 km. The car goes once around the track in 320 s. What is the magnitude of the centripetal acceleration of the car? 1 m/s2

    asked by Anonymous on November 6, 2012
  67. physics

    A soccer ball was kicked off a cliff that was h = 8.4 m above the ground. The ball was kicked at a speed of 25 m s-1 and an angle of 20 to the horizon. What is magnitude of the horizontal displacement of the ball? Use g = 9.8 m s-2.

    asked by help on December 15, 2016
  68. physics

    A 3.00-kg blob of putty moving at 2.40 m/s slams into a 4.80- g blob of putty at rest. Calculate the speed of the two stuck-together blobs of putty immediately after colliding

    asked by jim on February 27, 2012
  69. Physics

    a siren has a frequency of 1099 Hz when it and an observer are both at rest. The observer then starts to move and finds that the frequency he hears is 1185 Hz. What is the speed of the observer?

    asked by Chad on March 6, 2015
  70. physical science

    a ship is 850 m from a vertical cllff the ship sireN IS SOUNDED AN ECHO IS HEARD AFTER 5 SECOND CALCULATE THE SPEED OF THE SOUND FROM THE SIREN OF THE SHIP

    asked by tshepo lucky on April 13, 2014
  71. Physics

    You throw a 5.5 g coin straight down at 4.0 m/s from a 25-m-high bridge. A) How much work does gravity do as the coin falls to the water below? B)What is the speed of the coin just as it hits the water?

    asked by Nathan on October 30, 2016
  72. Physics

    A string is under a tension of 700.0 N. A 1.5 m length of the string has a mass of 4.5 grams. What is the speed of a transverse wave of wavelength 0.50 m in this string? What is the frequency of the wave?

    asked by Jerome on November 4, 2010
  73. Science

    A 1.0 m length of string has fixed attachments at both ends. The wave speed on the string is 400 m/s and the frequency is 800 Hz. What is the fundamental frequency of the string?

    asked by Rico on March 31, 2011
  74. Physics

    If you can throw a ball vertically upward to a height h = 30.5 m, what is the maximum horizontal range over which you can throw the same ball, assuming you throw it at the same initial speed?

    asked by Katie on February 8, 2010
  75. physics

    A train passing at point A at a speed of 72 kph accelerates at .75 m/s2 for one minute along a straight path then decelerated at 1.0 m/s2. How far in km from point A will it be 2 minutes after passing point A?

    asked by nonoy on August 15, 2010
  76. p[hysics

    A soccer ball was kicked off a cliff that was h = 8.4 m above the ground. The ball was kicked at a speed of 25 m s-1 and an angle of 20 to the horizon. What is magnitude of the horizontal displacement of the ball? Use g = 9.8 m s-2.

    asked by physics on December 15, 2016
  77. Physics

    A baseball of mass 0.13 kg, moving horizontally with a momentum of 4 kg¡Pm/s, is struck head-on by a baseball bat with an impulse of 10 N¡Ps. What is the speed of the baseball after it is struck? _______m/s

    asked by anonymous on October 20, 2013
  78. math

    You fire your potato gun horizontally from shoulder height, which is 190 cm above the ground. The potato strikes the ground 30 m away from you. What was the initial speed of the potato?

    asked by sonya on September 15, 2014
  79. Physics

    A car travels at a constant speed around a circular track whose radius is 2.8 km. The car goes once around the track in 430 s. What is the magnitude of the centripetal acceleration of the car?

    asked by Melanie on January 21, 2016
  80. Physics

    If you can throw a ball vertically upward to a height h = 30.1 m, what is the maximum horizontal range over which you can throw the same ball, assuming you throw it at the same initial speed

    asked by Emily on September 12, 2010
  81. Math

    Zachary traveled from city A to city B. He left city A at 7:30 a.m. and reached city B at 12 noon. Find the average speed if city B is 180 miles away from city A.

    asked by Jerome on January 9, 2016
  82. Physics

    A 87 g arrow is fired from a bow whose string exerts an average force of 105 N on the arrow over a distance of 76 cm. 1. What is the speed of the arrow as it leaves the bow?

    asked by Nick on November 1, 2010
  83. PHYSICS

    A car travels at a constant speed around a circular track whose radius is 2.82 km. The car goes once around the track in 364 s. What is the magnitude of the centripetal acceleration of the car?

    asked by Anonymous on October 12, 2015
  84. science

    passive transport involves movement of substances...... A) from areas of lower concentration areas of higher concentrations. B)from areas of higher concentrations to areas of lower concentration C) from areas which the concentration has reached a balance

    asked by KK on January 26, 2015
  85. american history

    Which of the following describes the ideas of W.E.B. Du Bois on civil rights? A. Equal rights were not a privilege that needed to be earned and society as a whole should carry the burden of achieving equality. B. African Americans should focus their energy

    asked by fast help needed on April 21, 2016
  86. Chemistry grade 12

    Molar Heat of Fusion of Ice Experiment. Does the Temperature of a component of a system [cup of warm water from experiemtn] depend on the quanity of matter in the sample? two different ways to increase the temperature of a pan of cold water??? Does the

    asked by Vincent on January 8, 2009
  87. mechanics: spring problem

    You drop a block from rest from a height h=3 m. The block lands on the spring at height h1 = 1.5 meters (spring constant = 160Nm) and compresses it 0.5 m before the block and spring momentarilty come to rest. (The spring then pushes the block upward.) What

    asked by student1618 on September 3, 2015
  88. Science

    Which of the following determines the type of biome classification that will be made for a particular region? Climate Size Mineral deposits Number of human settlements Think about how the amount of energy changes as you move stepwise from producers to

    asked by Abby on January 14, 2016
  89. English

    You are assigned to write an essay which must maintain the indicative mood throughout. Which of the choices below would need to be removed or revised? A) Have you ever wished for anything so badly that it hurt not to have it? B) I often walk down the

    asked by MarK on February 24, 2016
  90. physics

    A "swing" ride at a carnival consists of chairs that are swung in a circle by 12.0 m cables attached to a vertical rotating pole, as the drawing shows. (θ = 61.0°) Suppose the total mass of a chair and its occupant is 196 kg. the tension is 3961.97N Find

    asked by Natasha on February 22, 2012
  91. Physics

    2 Dimensional Motion-Kinematics QS 1: An airplane wishes to travel 800 km northeast of a starting point. There is a wind blow towards the east at 100km/h. Assuming the maximum speed of the plane in still air is 500km/h, a: what course should the pilot

    asked by mack on September 12, 2017
  92. physics

    which of the following is traveling faster than its terminal speed? 1)rain 2)snow 3)a shooting star(metor) 4)a rock that has fallen after breaking off a shear cliff face 5)a penny,18s after it has dropped from rest from a tower. 6)a skydiver going ~120mph

    asked by taylur on January 26, 2012
  93. college: Chemistry

    I need help on this homework problem and I do not understand how to work on it. Please help me with this problem. The photoelectric work function of a metal is the minimum energy needed to eject an electron by irradiating the metal with light. For calcium,

    asked by Mai on February 15, 2009
  94. Economics

    4. False advertising and the misrepresentation of products were made illegal by the: A. Federal Trade Commission Act. B. Wheeler-Lea Act. C. Sherman Act. D. Clayton Act. 6. All of the following are regulatory commissions dealing with industrial regulation

    asked by G on June 5, 2008
  95. Health and Physical Education 8 - It's urgent!

    Please check my answers because I need to do good at this. 1. When consuming fats the healthiest choice is foods high in? A. saturated fats B. unsaturated fats * C. trans fat D. cholesterol 2. The body's main energy source should come from what essential

    asked by Dominique on November 6, 2014
  96. Physics

    Solar heating takes advantage of solar collectors such as the type shown in the figure . During daylight hours, the average intensity of solar radiation at the top of the atmosphere is about 1400 W/m^2. About 50% of this radiation reaches the Earth during

    asked by Alice on May 7, 2011
  97. physics

    A student conducted an experiment to determine the resistance of a lightbulb. while performing the experiment the student noticed that the lightbulb began to glow and became brighter as she increased the voltage. of the factors affecting resistance, which

    asked by koeit on May 20, 2007
  98. Physics

    A 4.17 g bullet moving at 506.1 m/s penetrates a tree trunk to a depth of 4.64 cm. a) Use work and energy considerations to find the magnitude of the force that stops the bullet. Answer in units of N. b) Assuming that the frictional force is constant,

    asked by Madi on November 18, 2015
  99. Science

    For my science class I have to make a machine that attempts to convert heat energy into work. I'm not really sure how to do this, but I do have some ideas, however I'm not all the way there. If you told me your opinion of my ideas or if you gave me one of

    asked by Lynn on October 15, 2008
  100. Science

    3. Which of the following conditions would likely cause the activation energy to be high? A.atoms are close together B.the temperature is hot C.atoms are not close together * D.a catalyst is present 4. Which of the following materials will burn the fastest

    asked by Cassie on March 3, 2013

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