1. Chemistry

    I'm having a difficult time with the Conversion Units in my equation. Attempting to answer this question: My cell phone has an antenna about 10.00cm long. If this is one quarter of the wavelength of the radiation, at what frequency in Megahertz does it

    asked by Frank on February 27, 2012
  2. physics

    Figure 6-43 shows a "conical pendulum", in which the bob (the small object at the lower end of the cord) moves in a horizontal circle at constant speed. (The cord sweeps out a cone as the bob rotates.) The bob has a mass of 0.060 kg, the string has length

    asked by :) on December 5, 2010
  3. Classical Mechanics Physics - Urgent help please

    A ruler stands vertically against a wall. It is given a tiny impulse at θ=0∘ such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that ω(θ=0∘)=0. The ruler has mass m=

    asked by Briggs on December 7, 2013
  4. physics

    an amusement park ride consists of a rotating circular platform 7.4 m in diameter from which 10 kg seats are suspended at the end of 1.81 m massless chains. when the system rotates, the chains make an angle of 26.6 degree with the vertical. the

    asked by vanessa on November 21, 2010
  5. VHS

    A ski starts from rest and slides down 22 degree incline 75 m long.If the coefficient of friction is .090 what is the ski's speed at the base of incline and if the snow is level at the foot of the incline and has the same coefficient of friction,how far

    asked by SP on October 21, 2012
  6. Physics

    How Many Capillaries? The aorta has an inside diameter of approximately 2.1 cm, compared to that of a capillary, which is about 1.0×10−5m (10 μm). In addition, the average speed of flow is approximately 1.0 m/s in the aorta and 1.0 cm/s in a capillary

    asked by Brady on April 17, 2014
  7. algebra

    The time,t, required to drive a certain distance varies inversely with speed,r. If it takes 12 hours to drive the distance at 60 miles per hour, how long will it take to drive the same disatcne at 85 miles per hour? about 7.08 hours? about 5.00? or 8.47

    asked by PLEASE HELP ASAP on May 20, 2015
  8. physics

    A police car, whose siren has a natural frequency of 620Hz, moves away from a wall and towards a stationary observer at a speed of 30km/h. What is the beat frequency perceived by the observer? If the observer stands between the car and the wall, what beat

    asked by David on October 9, 2013
  9. Modern Physics

    (7) Show that if a particle moves at an angle θ with respect to the x-axis with speed u in frame S, then it moves at an angle θ′ with the x′-axis in frame S′ with tanθ′ = sinθ /( γ(cos θ − v/u)) Assume that S′ moves in the +x direction

    asked by Phil on September 18, 2011
  10. physics

    A daredevil is shot out of a cannon at 49.7◦ to the horizontal with an initial speed of 29.9 m/s. A net is positioned at a horizontal dis- tance of 49.8 m from the cannon from which the daredevil is shot. The acceleration of gravity is 9.81 m/s2 . At

    asked by Kacie on December 4, 2016
  11. physics

    One particle has a mass of 2.86 x 10-3 kg and a charge of +7.32 μC. A second particle has a mass of 6.41 x 10-3 kg and the same charge. The two particles are initially held in place and then released. The particles fly apart, and when the separation

    asked by S on January 24, 2015
  12. Phyiscs

    A stone falls from a railroad overpass which is 36 ft high into the path of a train which is approaching the overpass with a uniform speed. If the stone falls when the train is 50 ft away from the overpass and the stone hits the ground just as the train

    asked by Stone on September 5, 2011
  13. Physics

    A train moving at a constant speed of 61.0 km/h moves east for 35.0 min, then in a direction 50.0° east of due north for 10.0 min, and then west for 49.0 min. What is the average velocity of the train during this run? What is the magnitude of that

    asked by Anonymous on January 27, 2014
  14. physics

    A sports car of mass 1300 kg (including the driver) crosses the rounded top of a hill (r = 86 m) at 23 m/s. Determine the normal force exerted by the car on the 74 kg driver. Determine the car speed at which the normal force on the driver equals zero.

    asked by Anonymous on February 22, 2010
  15. Algebra

    Dawn averages a speed of 18 miles per hour during her bike race. The race is 90 miles long. Define a variable for the number of hours Dawn has been racing and use this variable to write an expression for the number of miles left in the race.

    asked by suezette on May 17, 2013
  16. Physics

    A water balloon is thrown horizontally at a speed of 2.00 m/s from a roof of a building that is 6.00 m above ground. At the same instant the balloon is released a second balloon is thrown straight down at 2.00 m/s from the same height. Determine which

    asked by Lisa K. on September 25, 2012
  17. physics

    an archer at the edge of a cliff fires an arrow from a height of 14.6 m above the ground at the bottom of the cliff. the arrow just clears a rock on a pillar that is 21.7 m above the gound which is 45.2 m horizontally away from the archer.determine a,the

    asked by Anonymous on September 28, 2012
  18. physics

    an archer at the edge of a cliff fires an arrow from a height of 14.6 m above the ground at the bottom of the cliff. the arrow just clears a rock on a pillar that is 21.7 m above the gound which is 45.2 m horizontally away from the archer.determine a,the

    asked by Anonymous on September 28, 2012
  19. physics

    A ball is thrown upward with an initial velocity of 6.0m/s by someone on top of the building 34m tall who is leaning over the edge so that the ball will not strike the building on the return trip. (a) How far above the ground will the ball be at the end of

    asked by jackie on April 10, 2012
  20. physics

    Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a

    asked by PLS HELP on October 11, 2013
  21. algebra

    An airplane flies 750 miles due west in 1 1/2 hours and 750 miles due south in 2 hours. What is the average speed of the airplane?

    asked by Mindy on September 2, 2010
  22. math

    A pinion gear with 10 teeth is driving a spur gear with 40 teeth. the spur gear is rotating at 160 rpm. determine the speed of the pinion gear?

    asked by Anonymous on February 3, 2016
  23. Algebra 1

    An airplane flies 750 miles due west in 1 1/2 hours and 750 miles due south in 2 hours. What is the average speed of the airplane?

    asked by Summer on May 20, 2011
  24. physic

    a car travels east at 89 km/h for 1 hour.it then travels 26 east of north at 141 km/h for another 1 hour. a)what is the average speed for the trip? b)what is the average velocity for the trip?

    asked by siti on September 8, 2014
  25. physics

    A particle that hangs from a spring oscillates with an angular frequency ω. The spring-particle system is suspended from the ceiling of an elevator car and hangs motionless (relative to the elevator car) as the car descends at a constant speed v. The car

    asked by flame on October 7, 2010
  26. physics

    A particle that hangs from a spring oscillates with an angular frequency ω. The spring-particle system is suspended from the ceiling of an elevator car and hangs motionless (relative to the elevator car) as the car descends at a constant speed v. The car

    asked by flame on October 6, 2010
  27. PhysicsIn what direction relative to north must ca

    Two canoeists start paddling at the same time and head toward a small island in a lake, as shown in the figure . Canoeist 1 paddles with a speed of 1.60 at an angle of 45 north of east. Canoeist 2 starts on the opposite shore of the lake, a distance of 1.5

    asked by Alyssa on February 9, 2012
  28. Math

    A plane leaves an airport and flies South 58 Degrees East for 2 hours, then changes course to South 43 Degrees West and flies for 3 hours. How far away is the plane from the airport if it keeps a constant speed of 500km/h? Draw a diagram and solve to the

    asked by Seth on November 4, 2015
  29. Physics

    A jet plane lands with a speed of 110 m/s and can accelerate with a maximum magnitude of 7.00 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time interval needed before it can come to rest? (b) Can this

    asked by KM on September 10, 2011
  30. physics

    a golf club exerts and average force of 1000N on a 0.045-kg golf ball which is initially at rest. the club is in contact with the ball for 1.8ms. what is the speed of the golfbal ass it leaves the tee? a batter applies an average force if 8000N to a

    asked by tina on February 25, 2009
  31. physics

    You and your friend are leaning over the edge of the roof of a tall building. At the same instant you throw a baseball straight up with an initial speed vo and your friend throws a marble straight down with the same initial velocity vo. Assume that you can

    asked by qwertzuiop on January 28, 2012
  32. physics

    A particle that hangs from a spring oscillates with an angular frequency ω. The spring-particle system is suspended from the ceiling of an elevator car and hangs motionless (relative to the elevator car) as the car descends at a constant speed v. The car

    asked by flame on October 8, 2010
  33. Physics

    A football player kicks a football with an initial velocity of 30m/s at an angle of 55 degrees relative to the flat ground. a)what is the speed of the football at its highest point b)find the highes point reached c)find the total time in the air d)how far

    asked by Daniel on December 13, 2009
  34. physics

    You and your friend are leaning over the edge of the roof of a tall building. At the same instant you throw a baseball straight up with an initial speed vo and your friend throws a marble straight down with the same initial velocity vo. Assume that you can

    asked by qwertzuiop on January 28, 2012
  35. physics

    You and your friend are leaning over the edge of the roof of a tall building. At the same instant you throw a baseball straight up with an initial speed vo and your friend throws a marble straight down with the same initial velocity vo. Assume that you can

    asked by qwertzuiop on January 28, 2012
  36. Physics

    Two uniform solid spheres have the same mass of 3 kg, but one has a radius of 0.25 m while the other has a radius of 0.8 m. Each can rotate about an axis through its center. (a) What is the magnitude τ of the torque required to bring the smaller sphere

    asked by Josh on January 11, 2014
  37. Physics 11

    A 62kg cyclist changes the speed of a 12kg bicycle from 8.2m/s to 12.7m/s. Determine the work done. I've already answered & gotten this question correct, however it made me confused about the concept. I found Ek. & Ek to find change in Ek which was

    asked by Kayla on May 30, 2017
  38. Literature (Writeacher)

    These questions regard "The Dangerous Game" by Richard Connell, which is available to read upon the internet. 1. (a) Why happens at the end of the story? (b) In the last scene of the story, why does Rainsford say "I am still a beast at bay"? 2. How do you

    asked by Anonymous on January 18, 2014
  39. Biology

    1)Animal cells prefer to be in isotonic solution, while plant cells prefer to be in hypotonic solution. Explain what this means and why it is so. 2.) In terms of Gibbs free energy, what does “unstable” mean? Also, give at least two additional ways to

    asked by Alex on October 24, 2012
  40. Physics

    A woman is riding a Jet Ski at a speed of 28 m/s and notices a seawall straight ahead. The farthest she can lean the craft in order to make a turn is 20°. This situation is like that of a car on a curve that is banked at an angle of 20°. If she tries to

    asked by Rash on September 23, 2018
  41. Physics

    A woman is riding a Jet Ski at a speed of 20 m/s and notices a seawall straight ahead. The farthest she can lean the craft in order to make a turn is 20°. This situation is like that of a car on a curve that is banked at an angle of 20°. If she tries to

    asked by Rash on September 23, 2018
  42. Algebra

    John walked 10 miles on Saturday. He walked twice as fast on the second 5 miles of his walk than he walked on the first 5 miles of his walk. Which expression represents the time he spent walking? Let x = John's speed on the first half of his walk.

    asked by Sandra on April 16, 2014
  43. physics

    The emf of a battery is equal to its terminal potential difference: A) under all conditions B) only when the battery is being charged C) only when a large current is in the battery D) only when there is no curent in the battery E) under no conditions my

    asked by susane on March 27, 2007
  44. Physics

    i have been asking physics questions on this and some people give me the formula, i'm getting the correct answers..please can the same people help me on this that helped me before.. A child rides a bicycle in a circular path with a radius of 2.0 m. The

    asked by y912f on February 16, 2009
  45. physics

    Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 95.0 kg, down a θ = 50.0° slope at constant speed. The coefficient of friction between the sled and the snow is 0.100. (a) How much work is done by friction as the sled moves

    asked by Karina on July 9, 2015
  46. physics

    In a local bar, a customer slides an empty beer mug down the counter for a refill. The bartender is momentarily distracted and does not see the mug, which slides off the counter and strikes the floor at distance d from the base of the counter. The height

    asked by eric on February 18, 2011
  47. Trigonometry

    Find the angular speed in radians per sec. of the second hand on a clock. My answer is 1 rpm =1*2pi radians/1minute(1 rotation = 2pi radians) =2pi radians/60seconds =1/30 radians/seconds It goes 2PI radians in 60 seconds. What happened to the PI? I forgot

    asked by James on July 4, 2007
  48. algebra 2

    So the dead line for my class is coming up. And I really need help for these questions! 2. Elaine shoots an arrow upward at a speed of 32 feet per second from a bridge that is 28 feet high. The height of the arrow is given by the function h(t) = -16t2+32t

    asked by Anonymous on April 26, 2016
  49. Physics - URGENT

    A car is speeding at constant velocity of 30ms-1 in an 80kmh-1 zone as it passes a stationary police motorcycle hiding. The motorcycle starts to accelerate at 5ms-2 at the same instant the car passes it and continues for 8 seconds. It then stops

    asked by Mariya on March 10, 2013
  50. Physics

    A Blowhard Tests of lung capacity show that adults are able to exhale 1.5 liters of air through their mouths in as little as 1.0 second. A. If a person blows air at this rate through a drinking straw with a diameter of 0.49cm , what is the speed of air in

    asked by Brady on April 17, 2014
  51. Physics - URGENT

    A car is speeding at constant velocity of 30ms-1 in an 80kmh-1 zone as it passes a stationary police motorcycle hiding. The motorcycle starts to accelerate at 5ms-2 at the same instant the car passes it and continues for 8 seconds. It then stops

    asked by Mariya on March 10, 2013
  52. Physics

    A child twirling a 0.0120kg ball on a string in a horizontal circle parallel to the floor. The radius of this circle is 0.358m. The ball traveling once around the circle is 2.08 seconds. a)Determine the centripetal force acting on the ball. b) If the speed

    asked by Lauren on March 25, 2009
  53. Physics

    An apparatus of the figure below is designed to study insects at an acceleration of magnitude 940 m/s2 (= 96g). The apparatus consists of a 2.0-m rod with insect containers at either end. The rod rotates about an axis perpendicular to the rod and at its

    asked by Max on March 2, 2010
  54. physics

    A 2000 kg space probe is moving rightward in empty space along the x axis at 12 m/s. One of the probe’s rockets is fired providing a thrust of 1800j N along the y axis. The rocket fires for 1.5 s. How can I derive the equation for the trajectory of the

    asked by julia on November 23, 2009
  55. physics

    A 2000 kg space probe is moving rightward in empty space along the x axis at 12 m/s. One of the probe’s rockets is fired providing a thrust of 1800j N along the y axis. The rocket fires for 1.5 s. How can I derive the equation for the trajectory of the

    asked by jon on November 23, 2009
  56. Physics

    In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.31 × 106 m/s.Find the central force acting on the electron as it revolves in a circular orbit of radius 4.95 × 10−11 m. Answer in units of N. Find the centripetal

    asked by CR on February 20, 2011
  57. Physics

    An air puck of mass 0.19 kg is tied to a string and allowed to revolve in a circle of radius 0.85 m on a frictionless horizontal table. The other end of the string passes through a hole in the center of the table, and a mass of 0.437 kg is tied to it as

    asked by Anonymous on February 26, 2016
  58. Physics- Ballistic pendulum

    A simple pendulum is made from a 2 kg. block of wood suspended from a light cord of length 1 m. When the pendulum is hanging in such a way that it is stationary and vertical, a bullet is shot horizontally into the block of wood where it sticks. The bullet

    asked by Joyce on December 30, 2015
  59. Physics

    We release an oil drop of radius r in air. The density of the oil is 640 kg/m . c_1 and c_2 for 1 atmosphere air at 20 C are 2.20* 10 ^-4 (kg/m)/sec and 0.81 kg/m , respectively. How small should the oil drop be so that the drag force is dominated by the

    asked by sied on October 10, 2013
  60. physics

    A 2000 kg space probe is moving rightward in empty space along the x axis at 12 m/s. One of the probe’s rockets is fired providing a thrust of 1800j N along the y axis. The rocket fires for 1.5 s. How can I derive the equation for the trajectory of the

    asked by maggie on November 21, 2009
  61. physics

    Each croquet ball in a set has a mass of 0.45 kg. The green ball, traveling at 12.6 m/s, strikes the blue ball, which is at rest. Assuming that the balls slide on a friction- less surface and all collisions are head-on, find the final speed of the blue

    asked by Anonymous on January 5, 2010
  62. Physics

    A car that weighs 14900.0 N is initially moving at a speed of 57.0 km/hr when the brakes are applied and the car is brought to a stop in 4.8 s. Find the magnitude of the force that stops the car, assuming it is constant. I found a using Vf=vi+at...a =

    asked by Lindsay on November 26, 2007
  63. College Physics

    If the spring is compressed a distance of 0.150 m and the gun fired vertically as shown, the gun can launch a 27.6g projectile from rest to a maximum height of 16.1 m above the starting point of the projectile. Neglecting all resistive forces, determine

    asked by Emily on September 30, 2012
  64. Physics

    1) A circular disk 0.20m in diameter starts from rest and accelerates with constant angular acceleration to an angular acceleration to an angular velocity of 210 rad/s in 10.00s. Find the angular acceleration and the angle which the disk has turned in

    asked by Anonymous on April 9, 2013
  65. ehglish

    i need to know if i need to add any puctuation?Descriptive paragraph Deborah Paul A loyal Friend My loyal friend Mary Ellen is 48 years old with shoulder length black hair and dark brown eyes. Mary Ellen works full time as an RPN in a nursing home taking

    asked by deborah on February 4, 2010
  66. Physics

    An advertising firm has contacted your engineering firm to create a new advertisement for a local ice-cream stand. The owner of this stand wants to add rotating solid cones (painted to look like ice-cream cones, of course) to catch the eye of travelers.

    asked by John on November 13, 2012
  67. Physics

    A daredevil decides to jump across a 15 m wide canyon on his motorcycle. The opposite side of the canyon is 3 m lower than the side the daredevil starts on. The daredevil drives his motorcycle off the cliff at a speed of 27 m/s. How long does it take the

    asked by Olivia on October 17, 2013
  68. physics

    From the top of a cliff, a person uses a slingshot to fire a pebble straight downward, which is the negative direction. The initial speed of the pebble is 9.0 m/s. (a) What is the acceleration (magnitude and direction) of the pebble during the downward

    asked by lennox on September 6, 2012
  69. Algebra

    Radio signals travel at a rate of 3*10^8 meters per second. How many seconds would it take for a radio signal to travel from a satellite to the surface of Earth if the satellite is orbiting at a height of 4.2*10^7 meters? (Hint: Time is distance divided by

    asked by Kaai97 on March 3, 2016
  70. College Physics

    Dry Ice. At standard atmospheric pressure, the solid form of carbon dioxide called “dry ice” undergoes a phase change not to a liquid but straight to a gas. This process is called sublimation, and like other phase transitions heat energy is required.

    asked by Anon on November 30, 2011
  71. physics

    Light-rail passenger trains that provide transportation within and between cities are capable of modest accelerations. The magnitude of the maximum acceleration is typically 1.3 {\rm m}/{\rm s}^{2}, but the driver will usually maintain a constant

    asked by kaitlyn on September 14, 2012
  72. physics

    an airplane with a speed of 40.4 m/s is climbing upward at an angle of 54 degrees with respect to the horizontal. When the planes altitude is 520 m, the pilot releases a package. a. calculate the distance along the ground measured from a point directly

    asked by mo on September 23, 2012
  73. Physics

    A model airplane has a mass of 0.95 kg and moves at a constant speed on a circle that is parallel to the ground. Assume that there is no upward lift on the plane generated by its wings. Without such lift, the guideline slopes downward due to the weight of

    asked by James on October 16, 2015
  74. Science

    1. Kudzu, a nonnative species, was brought to Georgia for decorative purposes. It is a vine that grows quickly and covers anything in its path. It can also grow on trees and block the sunlight. How is kudzu an environmental issue for Georgia? Kudzu can

    asked by Madison on April 26, 2017
  75. physcis

    Boat A negotiates a curve whose radius is 375 m. Boat B negotiates a curve whose radius is 150 m. Each boat experiences the same centripetal acceleration. What is the ratio of the speed of boat A to that of boat B?

    asked by KayLyn on February 19, 2012
  76. physics

    Boat A negotiates a curve whose radius is 336 m. Boat B negotiates a curve whose radius is 160 m. Each boat experiences the same centripetal acceleration. What is the ratio of the speed of boat A to that of boat B?

    asked by Shelby on February 19, 2012
  77. Math - Word problem

    I posted this earlier and received a reply - but the reply doesn't make sense. I drew up a picture of what was posted, but the figure comes out to finding the hypotenuse of a triangle that is 16x14 - not 16x10. What am I not seeing? Original problem: There

    asked by Mary on November 9, 2014
  78. Chemistry

    Restart the PhET simulation and set it up in the following manner: select Oscillate, select No End, and use the parameters in parentheses by sliding the bars for Amplitude (1.00 cm), Frequency (1.20 Hz ), Damping (none), and tension (highest). Using the

    asked by Sara on October 18, 2018
  79. chemistry

    Enthalpy and Entropy in Reactions and Solutions Introduction In the course of most physical processes and chemical reactions there is a change in energy. In chemistry what is normally measured is H (enthalpy change), the change in heat at constant pressure

    asked by allison on November 30, 2010
  80. science

    A class is learning about acceleration due to gravity. Their plan is to climb a ladder and drop different kinds of balls from the same height at the same time. They will repeat this for ten trials, recording the data after each test. A video will be made

    asked by orpheus on January 22, 2014
  81. physics

    A 1560 rocket is to be launched with an initial upward speed of 53.0 . In order to assist its engines, the engineers will start it from rest on a ramp that rises 53 above the horizontal (the figure ). At the bottom, the ramp turns upward and launches the

    asked by Anonymous on December 14, 2011
  82. physics parallel plate

    A proton traveling at a speed 1.0*106 m/s of enters the gap between the plates of a 2.0-cm-wide parallel-plate capacitor. The surface charge densities on the plates are 1*10^-6 C/m2. How far has the proton been deflected when it reaches the far edge of the

    asked by Anonymous on August 17, 2009
  83. Physics

    An old building is being demolished by swinging a heavy metal ball from a crane. Suppose that such a 85kg ball swings from a 20-m-long wire at speed 10m/s as the wire passes the vertical orientation. What tension force must the wire be able to withstand in

    asked by Anonymous on February 12, 2015
  84. Physics

    A 240 kg roller coaster car Rolls over the crest of the roller coaster with a speed of 2.2m/s.if it falls through a vertical height of 12m down the tracks to the bottom of a trough, how fast will it be travelling? So here's what I did but I don't think

    asked by Laura on March 26, 2017
  85. Physics

    A 645-kg elevator starts from rest and reaches a cruising speed of 1.47 m/s after 3.13 seconds. It moved 2.75 m during that time. What average power (W) is delivered by the motor during the initial acceleration of the elevator during the first 3.13

    asked by Casey on June 6, 2011
  86. Physics

    A 245 g toy car is placed on a narrow 70-cm-diameter track with wheel grooves that keep the car going in a circle. The 1.0 kg track is free to turn on a frictionless, vertical axis. The spokes have negligible mass. After the car's switch is turned on, it

    asked by Kaitlyn on April 19, 2014
  87. physics

    A mass hangs on the end of a massless rope. The pendulum is held horizontal and released from rest. When the mass reaches the bottom of its path it is moving at a speed v = 2.3 m/s and the tension in the rope is T = 21.8 N. Return to the original mass.

    asked by yahaira Due Tonight, please Help on October 28, 2018
  88. PHYSICS

    A train engine pulls out of a station along a straight horizontal track with five identical freight cars behind it, each of which weighs 88.0 kN. The train reaches a speed of 13.0 m/s within 6.50 min of starting out. Assuming the engine pulls with a

    asked by Anonymous on February 8, 2012
  89. Physics Quick!

    A tire 0.650 m in radius rotates at a constant rate of 240 rev/min. Find the speed of a small stone lodged in the tread of the tire (on its outer edge). (Hint: In one revolution, the stone travels a distance equal to the circumference of its path, 2¥ðr.)

    asked by kk2 on August 19, 2012
  90. College Physics 2

    Find the resonant frequency of a circuit that has a 400 mH inductor and a 30 nF capacitor connected in series. A) Canadian FM radio station (CLAW) broadcasts lobster information at 95.9 MHz. find the wavelength of this station. B) What would be the

    asked by seanmarch58 on July 30, 2014
  91. Science

    An alien spaceship is revolving around a spherical asteroid in a very low circular orbit. The period of revolution of the spaceship is 15 minutes. A research party of the alien students lands on the steroid and drills a tunnel through it along a diameter.

    asked by Freddy on June 18, 2011
  92. physics

    Two point sources, 5.0 cm apart are operating in phase, with a common frequency of 6.0 Hz, in a ripple tank. A metre stick is placed above the water, parallel to the line joining the sources. The first nodal lines (the ones adjacent to the central axis)

    asked by ali on January 16, 2011
  93. Physics

    Tyler runs the length of a soccer field (100m). A. How much time is required for him to run the full length at speed v? B. If he runs at 6.0 m/s how long does it take tyler to run the length of the field?

    asked by AZ on September 11, 2011
  94. Physical Science

    A player uses a hockey stick to increase the speed of a 0.200kg hockey puck by 6 m.s in 2 seconds. A) How much did the hockey puck accelerate? B) How much force was exerted on the puck? C) How much force did the puck exert on the stick?

    asked by Sweet on February 7, 2011
  95. Math

    a woman drives to work and averages 70 kilometers per hour for the trip. On her trip from work to home she averages 100 kilometers per hour. What is her average speed for the round trip?

    asked by Justin on July 15, 2015
  96. Physics

    A 51.6 g box is left 17.8 cm from the centre of a merry-go-round. If the box has coefficients of friction of μs = 0.790 and μk = 0.480 with the merry-go-round, what is the maximum speed of the merry-go-round without having the box slide off of the

    asked by Tom on October 22, 2016
  97. algebra

    The stopping distance s of a car varies directly as the square of its speed v. If a car traveling at 30 mph requires 81 ft to stop, find the stopping distance for a car traveling at 55 mph.

    asked by lakpa on November 21, 2014
  98. college Algebra

    James drove the 24 miles to two and back in hour. On the return trip, he was able to average 20 miles per hour faster than he averaged on the trip to town. what was his average speed on the trip to town?

    asked by liliy on June 3, 2016
  99. physics

    two objects are thrown from the top edge of a cliff with a speed of 10 m/s. one object is thrown straight down and the other straight up. if the first object hits the ground in 4.0 second, the second hits the ground in ________ seconds after the first

    asked by bob on August 9, 2012
  100. PHYSICS

    A bat flies toward a wall at a speed of 3.5 m/s. As it flies, the bat emits an ultrasonic sound wave with frequency 30.5 kHz. What frequency does the bat hear in the reflected wave? kHz

    asked by BRANDY on November 18, 2010

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