1. physics

    A softball (350g) is thrown with an initial speed of 23 m/s straight upward. What is the maximum potential energy the softball can have?

    asked by Sandy on December 9, 2009
  2. physics

    A physics professor lifts her 9.0-kg briefcase at constant speed with an upward force. Find the magnitude of her force.

    asked by Nolan on February 25, 2011
  3. Physics

    A moving object has a kinetic energy of 146 J and a momentum of 23.4 kg·m/s. a) Find the speed of the object. Answer in units of m/s.

    asked by Michael N. on January 26, 2011
  4. math

    Ms. Kolawaski rides her exercise bike at an average speed of 12 miles per hour. How many minutes does it take her to ride 16 miles?

    asked by zion on October 17, 2013
  5. physics

    A physics professor lifts her 9.0-kg briefcase at constant speed with an upward force. Find the magnitude of her force.

    asked by Nolan on February 25, 2011
  6. physics

    A physics professor lifts her 9.0-kg briefcase at constant speed with an upward force. Find the magnitude of her force.

    asked by Nolan on February 25, 2011
  7. physics

    A car moving at 10m/s when it begins to be accelerated at 2.5m/s^2. (a)How long does the car take to reach a speed of 25m/s? (b) How far does it go during this period

    asked by Ashley on January 27, 2011
  8. Physics

    A frisbee is thrown horizontally with a speed of 12 m/s. If the frisbee moves a horizontal distance of 15 m, how long will it stay in the air?

    asked by Please help on March 7, 2015
  9. physics

    If a woman lifts a 16.2 kg bucket from a well and does 6.33 kJ of work, how deep is the well? Assume that the speed of the bucket remains constant as it is lifted.

    asked by Chris on October 1, 2013
  10. physics

    A 1,000.0 Kg car with a speed of 90.0km/h brakes to stop. How many cal of heat are generated by the brakes as a result?

    asked by ANTOINE on October 10, 2011
  11. science-reasoning

    light travells in a straight line at a constant speed of 300,000 km/sec. what is the light's acceleration?

    asked by Drew on October 20, 2007
  12. physics

    3.54 x 10^2 J of work is done to speed up a 1.22 x 10^2 kg log rolling along the ground. If the log was originlly moving at 2.3 m/s, determine how fast it ends up going.

    asked by Abby on December 7, 2012
  13. physics

    A rocket is launched with a speed of 282 m/s at an angle of 41.2 degrees above the horizontal. How far does the rocket travel before it hits the ground?

    asked by Anonymous on September 30, 2012
  14. Physics

    If a ball has an initial speed of 26.6 m/s and is launched at an angle of 63.2 degrees above the horizontal, what is the tallest obstacle that the ball can clear?

    asked by Anonymous on November 5, 2009
  15. physics

    The boy on the tower of height h = 20 m in the figure below throws a ball a distance of x = 52 m, as shown. At what speed, in m/s, is the ball thrown?

    asked by Anonymous on February 9, 2011
  16. physics

    If a ball has an initial speed of 26.9 m/s and is launched at an angle of 63.2 degrees above the horizontal, what is the tallest obstacle that the ball can clear?

    asked by Cassie on October 6, 2013
  17. Physics

    What are the direction and magnitude of your total displacement if you have traveled due west with a speed of 25.0 m/s for 125 s, then due south at 19.0 m/s for 66.0 s?

    asked by Anonymous on September 10, 2012
  18. physics

    The length of the B string on a certain guitar is 60.0 cm. It vibrates at a fundamental frequency of 246.0 Hz. What is the speed of the transverse waves on the string?

    asked by Jac on April 8, 2016
  19. physics

    A certain car is capable of accelerating at a uniform rate of 0.83 m/s2 . What is the magnitude of the car’s displacement as it accelerates uniformly from a speed of 80 km/h to one of 92 km/h?

    asked by Anonymous on September 25, 2015
  20. physics

    A certain car is capable of accelerating at a uniform rate of 0.83 m/s2 . What is the magnitude of the car’s displacement as it accelerates uniformly from a speed of 80 km/h to one of 92 km/h?

    asked by Anonymous on September 25, 2015
  21. Physics

    A rocket blasts off from rest and attains a speed of 30.4 m/s in 10.3 s. An astronaut has a mass of 60.1 kg. What is the astronaut's apparent weight during takeoff?

    asked by Randy on February 13, 2013
  22. physics

    If the mass of a cart full of groceries decreases to half and, at the same time, its speed doubles, the momentum of the cart?

    asked by Anonymous on November 5, 2010
  23. Physics please help!!

    If a woman lifts a 19.3 kg bucket from a well and does 6.10 kJ of work, how deep is the well? Assume that the speed of the bucket remains constant as it is lifted

    asked by Megan on February 7, 2011
  24. physics

    blood is pumped from the heart at a rate of 5.0l/min into the aorta (radius 1.0cm)determinethethe speed of the blood

    asked by moni on February 5, 2017
  25. Physics

    A rock is dropped from a high bridge. At the end of 3sec of free fall. The speed of rock is, in centimeters per second

    asked by Anonymous on June 16, 2019
  26. physics

    a balloon is moving upwards with speed of 5m per second .when it is at height 98 m.a packet dropped from it .what velocity of packet when it strikes the ground

    asked by ash on September 23, 2012
  27. physics

    A rocket blasts off from rest and attains a speed of 59.4 m/s in 14.1 s. An astronaut has a mass of 66.7 kg. What is the astronaut's apparent weight during takeoff?

    asked by S on September 30, 2014
  28. Chemistry #27

    If He(g) has an average kinetic energy of 4410 J/mol under certain conditions, what is the root mean square speed of O2(g) molecules under the same conditions?

    asked by Chelsea on October 13, 2013
  29. physics

    An aircraft in a straight line with a constant speed of 450km.h ,What is the magnitude of the resultant force acting on the aircraft?

    asked by rose on February 22, 2013
  30. Physics

    A student rides his skateboard for 10 minutes and travels 1.2 miles. What is the average speed of the skateboarder in miles/minute?

    asked by Tesha on September 14, 2015
  31. Physics

    A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.25 and the push imparts an initial speed of 6.0m/s?

    asked by Whitney on September 25, 2014
  32. Physics

    A truck travels up a hill. With a 6.5 incline the truck has a constant speed of 17 m/s what is the horizontal component of the trucks velocity

    asked by Nathan on October 4, 2018
  33. math

    moe ran 3/4 a mile in 15 minutes.if he runs at the same constant rate of speed how long will it take him to run one mile

    asked by agatha on October 5, 2018
  34. Physics

    A car with 60 cm diameter tires is traveling at a constant speed of 100 km/hr. What is the angular velocity of the tires in rad/s?

    asked by Bryan on November 14, 2012
  35. physics

    A soccer ball rolling across a field with an acceleration of -0.5m/s/s rolls 12.5 m and then comes to a stop after 8 seconds. What was the ball's initial speed?

    asked by Ahmad on September 24, 2014
  36. Physics

    A rocket blasts off from rest and attains a speed of 42.2 m/s in 10.9 s. An astronaut has a mass of 63.8 kg. What is the astronaut's apparent weight during takeoff?

    asked by shine on December 12, 2012
  37. scottsdale CC

    A car travels around a curve at a constant speed of 80.0 km/h. What is the car’s instantaneous velocity at an instant when it is headed west

    asked by juan on February 20, 2012
  38. chemistry

    If He(g) has an average kinetic energy of 7590 J/mol under certain conditions, what is the root mean square speed of F2(g) molecules under the same conditions?

    asked by A on September 28, 2014
  39. Physics

    Work is done on an object of mass 2kg to increase its kenetic energy to 18J. Calculate the speed of the object.

    asked by Anonymous on February 17, 2013
  40. Physics

    A Frisbee is thrown horizontally with a speed of 12 m/s. If the Frisbee moves a horizontal distance of 15 m, how long will it stay in the air?

    asked by Jhoy on March 6, 2015
  41. Math (unit rates)

    A school bus traveled at an average speed of 35 miles per hour for 45 minutes. What distance did the bus travel?

    asked by princessleaya on November 24, 2017
  42. Physics

    The speedometer of your car shows that you are traveling at a constant speed of 35 m/s. Is it possible that your car is accelerating? yes no If so, explain how this could happen. see the above post.

    asked by Mary on March 20, 2007
  43. physics

    19. In Figure 10-1, if the force exerted on a 3.0-kg backpack that is initally at rest is 20.0 N and the distance it acts over is 0.25 m, what is the final speed of the backpack?

    asked by w on November 15, 2011
  44. physics

    A rocket blasts off from rest and attains a speed of 59.4 m/s in 14.1 s. An astronaut has a mass of 66.7 kg. What is the astronaut's apparent weight during takeoff?

    asked by S on September 28, 2014
  45. chemistry

    If He(g) has an average kinetic energy of 7590 J/mol under certain conditions, what is the root mean square speed of F2(g) molecules under the same conditions?

    asked by B on September 28, 2014
  46. Physics

    A car with 60 cm diameter tires is traveling at a constant speed of 100 km/hr. What is the angular velocity of the tires in rad/s?

    asked by Bryan on November 14, 2012
  47. Nautical

    With a steady wind blowing at 15Kn blowing over the sea is it possible to determine the speed the waves are travelling? Thanks Mike

    asked by Mike on November 23, 2007
  48. Physics

    The escape speed from a planet of mass 2.5×10^24 is 7.0 km/s.What is the planet's radius? Iam using the formula v=sqr(2GM/r) v=7 G=6.67*10^-11 M=2.5*10^24 r=? I get 6.8*10^12 Where did I go wrong?

    asked by James on March 30, 2009
  49. physics

    A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.17 and the push imparts an initial speed of 4.3 m/s?

    asked by Kyle on December 3, 2009
  50. physics

    A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.17 and the push imparts an initial speed of 4.3 m/s?

    asked by Kyle on December 3, 2009
  51. Physics

    The escape speed from a planet of mass 2.5×10^24 is 7.0 km/s.What is the planet's radius? Iam using the formula v=sqr(2GM/r) v=7 G=6.67*10^-11 M=2.5*10^24 r=? I get 6.8*10^12 Where did I go wrong?

    asked by James on March 29, 2009
  52. physics

    A ball is thrown straight upwards at a speed of 32.3 m/s and from a height of 1.5 m above the ground. How fast is it traveling when it hits the ground? (m/s)

    asked by selvi on September 29, 2012
  53. physics

    You throw a ball downward from a window at a speed of 2.0m/s. The ball accelerates at 9.8m/s^2. How fast is it moving when it hits the sidewalk 2.5m below?

    asked by Skylar on November 18, 2012
  54. Physics

    What is the impact speed when a car moving at 95km/h bumps into the rear of another car traveling in the same direction at 93km/h?

    asked by Sarah on October 12, 2011
  55. Science

    A rollercoaster will be going at a speed of 36 m/s through a loop. To make sure the riders don't experience acceleration greater than 20 m/s2, what should be the radius of the loop?

    asked by Jocelyn on November 15, 2010
  56. PHYSICS (PLEASE READ)

    I tried all the formulas i know but i cannot answer it I really need your help in this question.. A projectile was launched 64° above the horizontal, attaining a height of 10 m. What is the projectile's initial speed?

    asked by kike paul on November 24, 2011
  57. Physics

    An object is thrown upwards from a height of 50.0m at an initial speed of 19.6m/s. Determine how long will it take for the object to reach the ground.

    asked by cams on December 14, 2014
  58. Mathse

    Balloon rising 4m/s, wind blow horizontal at speed of 4.5m/s find the velocity of balloon relative to the ground?

    asked by Meseret on May 23, 2017
  59. 11 grade physics

    A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.24 and the push imparts an initial speed of 4.2 m/s?

    asked by Cameron on November 14, 2010
  60. physics

    The boy on the tower of height h = 18 m in the figure below throws a ball a distance of x = 62 m, as shown. At what speed, in m/s, is the ball thrown?

    asked by Sanda on February 3, 2012
  61. Math

    A plane will normally cover 52 km in 12 min in still air. On one trip she flew with the wind for 2.5 hr. returning, she still had 100 km to go after 3.5 hr. what was the wind speed?

    asked by Kay on November 19, 2012
  62. Physics acceleration

    A car accelerates uniformly from rest to a speed of 91.4 mi/h in 7.68 s. Find the constant acceleration of the car. Answer in units of m/s

    asked by Jackie on October 1, 2015
  63. physical science

    a yo-yo is swung in a vertical circle in such a way that its total energy KE+ Pe is constant. At what point in the circle is the speed a maximum? minimum? why?

    asked by Brian on November 6, 2011
  64. Science

    a pendulum bob has by passing through its lowest position. what is its speed when make angle of 60 with the vertical the length of the pendulum is 0.5 .

    asked by Ankit on February 7, 2017
  65. physics

    a boy throws a ball from the top of a tower with velocity 20 m/s in horizontal direction. The speed of the ball after 2 seconds is?

    asked by Anonymous on February 8, 2013
  66. physics

    A 1.92 kg cart and a 3.7 kg cart both slide toward each other at 1.34 m/s on an air track. They collide and stick. The combined mass moves at what speed in m/s

    asked by Anonymous on February 6, 2012
  67. Physics

    at what speed (in unit of "c") will an object's kinetic energy be 40% of its rest energy?

    asked by ann on May 10, 2009
  68. chemistry

    The speed of light is 3.00 times 10^8~m/s. How fast is this in miles per hour (miles/h)?

    asked by Mely on September 4, 2010
  69. Science

    The speed of light in a plastic material is 1.4 x 10^8. What is the index of refraction of the material?

    asked by Jerome on January 18, 2016
  70. physical science

    speed decreases as distance decreases for the same time true or false

    asked by donna on June 5, 2012
  71. Physics

    If the two protons and the are all at rest after the collision, find the initial speed of the protons.

    asked by Caleb on April 15, 2012
  72. Math

    A bullet reaches a speed of 900 ft per sec in .2 sec. What is its acceleration.

    asked by Kory on May 14, 2013
  73. Physics

    During the first 50 s a truck traveled at constant speed of 25 m/s. Find the distance that it traveled.

    asked by Student on September 8, 2016
  74. NSCI 110

    a car that was initially moving at 25 m/s is accerlerated at 4.0 m/s^2 for 5.0 s. the final speed of the car is?

    asked by ebony on October 7, 2012
  75. Please help with my grandsons math

    a snail travels about 0.13 cm in one minutes.how far would it travel in 7 minutes if it keeps up the same speed?About how long would it take to go 3 m?

    asked by Martha on June 6, 2016
  76. Physics - grade 11

    The speed of light of a plastic is 1.4x10^8. What is the index of refraction in the plastic?

    asked by crystal on February 24, 2012
  77. physics

    a 40 kg high jumper leaves the ground with a speed of 6m/s. how high can he jump ?

    asked by Bobby on January 20, 2013
  78. physics

    The index of refraction of a certain type of glass is 1.58 what is the speed of light in the glass ?

    asked by amy on December 5, 2012
  79. Physics

    If a ball has an initial downward speed of 24 m/s, how far does the ball drop during the 4 s to 5 s interval?

    asked by Brooke on September 23, 2012
  80. Physics

    A 1200.0-kg car speeds up from 16.0 m/s to 20.0 m/s. How much work was done on the car to increase its speed?

    asked by Sara on March 5, 2013
  81. math

    if someone walks 5km in 21 minutes and then 4 km in 39 minutes then whats his average speed

    asked by j on March 12, 2014
  82. physics

    a ball rolls off the edge of a horizontal at 10m/s, what is the speed of the ball 2s later?

    asked by ann on January 17, 2016
  83. Physics

    Give an example of an object that moves with constant acceleration and constant speed.

    asked by Anonymous on June 11, 2012
  84. Math

    What is the speed of a walking person in m/s if the person travels 1000m in 20 minutes.

    asked by Kelley on April 16, 2013
  85. Physics

    an object moves from the position (1,3,-5) to the position (-1,4,8) during time 8 s. what is the average speed?

    asked by Jasalle on March 1, 2011
  86. speed

    a train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How can the train's acceleration be described?

    asked by Anonymous on January 30, 2014
  87. physics 2

    find the speed of proton 0.08m,mass of proton is 1.67x10^-27 kg

    asked by arcy on July 16, 2014
  88. Math

    A train travels 75 feet in 1/13 second. At the same speed, how many feet will it travel in 5 1/2 seconds?

    asked by Yoana on July 17, 2012
  89. Physics

    A 22 cm diameter bowling ball has a terminal speed of 85 m/s. What is the ball's mass?

    asked by Kara on June 11, 2010
  90. science

    calculate the distance an object travels if its speed is 60km/h and it travels for 6h

    asked by fg on January 9, 2011
  91. physics

    A snail moved 0.14 m between two cabbages in 3.0 minutes. The average speed of the snail is

    asked by l on July 31, 2014
  92. Science Check Answer

    5. Acceleration is a change in position and speed. True or false I think False

    asked by Anonymous on March 31, 2013
  93. Math

    A train travels 70 feet in 1/10 second. At this same speed, how many feet will it travel in 3 1/2 seconds?

    asked by Suzanne on May 3, 2015
  94. science

    what is the speed needed to launch a space crop in outer space?

    asked by Anonymous on November 4, 2009
  95. Chemistry

    An electron has a speed of 500m/s with uncertainty of 0.02% what is the uncertainty indicating it's position?

    asked by Anmol gill on September 22, 2017
  96. science

    how many kinds of different kinds of measurements would you need to make in order to calculate the speed of something????

    asked by nathaniel on January 6, 2011
  97. Physics (HELP)

    If light travels through a medium at a speed of 2.2 x 10^8 m/s, what is the index of refraction of the medium? 1.33 1.36 1.46 1.51

    asked by Anonymous on April 5, 2018
  98. Physics

    If a ball has an initial downward speed of 24 m/s, how far does the ball drop during the 4 s to 5 s interval

    asked by Savannah on September 23, 2012
  99. Physics

    an object falls from a 3m height what is the speed of the object just before it touches the ground?

    asked by Kat on April 6, 2015
  100. Science

    A rock with a mass of 0.3 kg has a kinetic energy of 43.2 j when thrown. What was the speed at which it was thrown?

    asked by Nick on October 14, 2013

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