1. English

    Tell what person, what type, and how you know. Mr. Morton knew the students were running out of time, but he felt that he needed to give an example of the activity, so he did. One of his students raised his hand. "Yes?" Mr. Morton asked. "I know I'm going

    asked by Anonymous on April 7, 2014
  2. History

    "The renewable energies roadmap unveiled earlier this month by the Commission sets a target of 20% for the share of total energy supply to come from renewable sources. “It is not the first time that targets for renewable energy have been fixed. In 1997,

    asked by Bill on September 13, 2015
  3. Physics

    you are moving a 50 kg crate by sliding it. you push on the crate with a force of 315 n at 21 degrees below the horizontal. the coefficient of kinetic friction is 0.21. how far does the crate move in 15 seconds?

    asked by Lyra on October 29, 2017
  4. Physics

    A tennis ball of mass m = 0.065 kg and speed v = 25 m/s strikes a wall at a 45° angle and rebounds with the same speed at 45° (Fig. 7-29). What is the impulse given the wall? I started out with finding the momentum and doubling it to get the impulse on

    asked by Anonymous on November 11, 2009
  5. physics

    A vehicle with a mass of 2 tons travels on a horizontal road at a speed of 126km/h.The driver notices a donkey at the side of the road and decides to reduce speed. The brakes are applied and the vehicle slows down to 72km/h after 5 seconds. Calculate the

    asked by leslie on March 6, 2013
  6. Physics

    The tortoise and the hare are in a race of 1000m distance. The tortoise travels the entire race at a speed of 2.0 m/s while the rabbit runs the first 200 m @ 2.0 m/s. Then he stops to take nap for 1.3 hrs and awakens to finish the last 800m with an average

    asked by Karen on September 22, 2015
  7. science

    Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 4.8-kg projectile from rest to a speed of 3.9 103 m/s. The net force accelerating the projectile is 4.8

    asked by butcha on November 1, 2013
  8. physics

    A 100-g toy car is propelled by a compressed spring that starts it moving. The car follows the curved track Show that the final speed of the toy car is 0.687 m/s if its initial speed is 2.00 m/s and it coasts up the frictionless slope, gaining 0.180 m in

    asked by effraim on March 25, 2014
  9. Physics

    A soccer play kicks the ball toward a goal that is 29m in front of him. The ball leaves his foot at a speed of 19m/s and at an angle of 32degrees above the ground. Find the speed of the ball when the goalie catches it in front of the net. my work: vxi=16.1

    asked by Morgan on October 30, 2016
  10. physics

    Ian is firmly attached to a snowboard which is on a flat surface of ice, which you can assume to be frictionless. He and the snowboard are initially at rest. He then throws a 138 g ball which travels at a speed of 19.2 m/s, and finds himself moving

    asked by Lydia on November 8, 2011
  11. math

    Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 7.9-kg projectile from rest to a speed of 2.8 × 103 m/s. The net force accelerating the projectile

    asked by Thomas on January 5, 2017
  12. Physics

    A student throws a baseball at a large gong 73 m away and hears the sound of the gong 1.7744 s later. The speed of sound in air is 330 m/s. What was the average speed of the base- ball on its way to the gong? (For simplicity, assume its trajectory to be a

    asked by Leslie on May 8, 2011
  13. physics

    Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 7.0 kg projectile from rest to a speed of 4.0 x 103 m/s. The net force accelerating the projectile is 4.9

    asked by paul on September 20, 2013
  14. physics

    Kevin has a mass of 77.5 kg and is skating with in-line skates. He sees his 21.00 kg younger brother up ahead standing on the sidewalk, with his back turned. Coming up from behind, he grabs his brother and rolls off at a speed of 2.18 m/s. Ignoring

    asked by Anonymous on January 12, 2015
  15. physics

    Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 9.7-kg projectile from rest to a speed of 6.5 × 103 m/s. The net force accelerating the projectile is 8.0

    asked by BRAD on June 24, 2013
  16. Physics

    A student throws a baseball at a large gong 45 m away and hears the sound of the gong 1.35258 s later. The speed of sound in air is 330 m/s.What was the average speed of the base- ball on its way to the gong? (For simplicity, assume its trajectory to be a

    asked by Tristan on September 29, 2013
  17. physicsh

    Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 4.8-kg projectile from rest to a speed of 3.9 103 m/s. The net force accelerating the projectile is 4.8

    asked by butcha on October 31, 2013
  18. physics

    A soccer player kicks the ball toward a goal that is 27.8 m in front of him. The ball leaves his foot at a speed of 18.5 m/s and an angle of 30.4° above the ground. Find the speed of the ball when the goalie catches it in front of the net. (Note: The

    asked by Kelly on January 26, 2012
  19. Physics

    Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 1.9-kg projectile from rest to a speed of 5.1 × 103 m/s. The net force accelerating the projectile is 8.6

    asked by Sam on September 25, 2014
  20. Physics

    An open train car, with a mass of 2150 kg, coasts along a horizontal track at the speed 2.29 m/s. The car passes under a loading chute and, as it does so, gravel falls vertically into it for 2.67 s at the rate of 441 kg/s. What is the car's speed after the

    asked by Kyle on November 19, 2012
  21. Physics

    To get to a concert on time, Dakota has to drive 122 miles in 2.00 hrs. (a) if he drove at an average speed of 55.0 mi/hr in a due west direction for the first 1.20 hr what must be his average speed if he is heading 30 degrees south of west for the

    asked by Dakota S on September 12, 2010
  22. PHYSICS

    Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 8.9-kg projectile from rest to a speed of 4.2 × 103 m/s. The net force accelerating the projectile is 1.4

    asked by Tom on March 16, 2014
  23. English

    1. The lizard is walking on a branch. 2. The lizard is running on a branch. 3. The lizard is creeping on a branch. 4. The parrot is singing. 5. The parrot is chirping. 6. The parrot is twittering. (Can we use all the expressions?)

    asked by rfvv on May 28, 2012
  24. Chemistry

    Cells use the hydrolysis of adenosine triphosphate (aTP) as a source of energy. This reaction can be written as, ATP(aq) + H2O(l) --> ADP(aq) + H2PO4-(aq), wehre ADP represents adenosine diphosphate. For this reaction, Delta Grxn = -30.5KJ/mol. If all the

    asked by Anonymous on April 7, 2016
  25. physics

    If you accelerate due to gravity (free fall), your acceleration is -9.8 m/s2. In some fields, particularly aviation, this is referred to as 1 g of acceleration. If you were accelerating at 2.5 g, what would be your average acceleration? If you started from

    asked by iyzi on October 12, 2013
  26. Math

    Jared can paddle his canoe 1 mile upstream in 1 hour, but it takes only a half hour to paddle back the same distance. Find the speed of water. (Hint: d=rt and the rate or canoe speed, depending on which way he is going.)

    asked by Melissa on November 2, 2012
  27. Physics

    The speed limit on a particular freeway is 28.0 m/s (about 101 km/hour). A car that is merging onto the freeway is capable of accelerating at 5.50 m/s2. If the car is currently traveling forward at 13.0 m/s, what is the shortest amount of time it could

    asked by Jane on September 19, 2011
  28. Mathematics

    An arrow is fired horizontally at a speed of 50m/s from the top of a vertical cliff overlooking the sea. The height of the cliff is 12m. Determine The speed and angle to the horizontal of the arrow when it enters the sea?

    asked by John on December 10, 2015
  29. physics

    A girl throws a water-filled balloon at an angle of 50.0∘^\circ above the horizontal with a speed of 12.0m/s{\rm m}/{\rm s} . The horizontal component of the balloon's velocity is directed toward a car that is approaching the girl at a constant speed of

    asked by joe on May 17, 2014
  30. physics

    A bird is flying with a speed of 12.0 m/s over water when it accidentally drops a 2.30 kg fish. The acceleration of gravity is 9.81 m/s2 . If the altitude of the bird is 8.20 m and air resistance is disregarded, what is the speed of the fish when it hits

    asked by Michael on January 10, 2011
  31. Physics

    Ports A and B are 400 miles apart. One boat starts from port A for port B at 6:05 and travels with a constant speed of 12 mph. If it leaves port A at 8:20, what speed musta a second boat have to arrive at port B at the same time? Explain your reasoning.

    asked by JD Smith on September 19, 2010
  32. physics

    a daredevil on a motorcycle leaves the ramp with a speed of 35.0 miles per hour. if his speed is 33.0 miles per hour when he reaches the peak of his path, what is the maximum height that he reaches. ignore friction and air resistance

    asked by nelo on November 21, 2011
  33. Physics

    An arrow is fired horizontally at a speed of 50m/s from the top of a vertical cliff overlooking the sea. The height of the cliff is 12m. Determine The speed and angle to the horizontal of the arrow when it enters the sea?

    asked by John on December 10, 2015
  34. Physics

    The speed limit on a particular freeway is 28.0 m/s (about 101 km/hour). A car that is merging onto the freeway is capable of accelerating at 6.50 m/s2. If the car is currently traveling forward at 13.0 m/s, what is the shortest amount of time it could

    asked by Thomas on November 29, 2010
  35. physics

    Red light with a wavelength of 7.0x10^-7 m travels at a speed of c. When it enters glass it's speed is reduced to 2.0x10^8 m/s. Calculate the wavelength of this redlight in glass. Assume that the frequency does not change. I'm really confused and I'm not

    asked by emily on May 17, 2017
  36. Physics

    Ports A and B are 400 miles apart. One boat starts from port A for port B at 6:05 and travels with a constant speed of 12 mph. If it leaves port A at 8:20, what speed musta a second boat have to arrive at port B at the same time? Explain your reasoning.

    asked by JD Smith on September 19, 2010
  37. Math

    Roy kayaked up the river and then back in a total of 5 hours. The trip was 4 miles each way and the current was difficult. If Roy kayaked at a speed of 4 mph, what was the speed of the current? Round your answer to 2 decimal places.

    asked by Keonn'a: Please help me ? on November 8, 2017
  38. physics

    A motorcycle, which has an initial linear speed of 6.6 m/s, decelerates to a speed of 2.1 m/s in 5.0 s. Each wheel has a radius of 0.65 m and is rotating in a counterclockwise (positive) direction. What are a) the constant angular acceleration (in rad/s^2)

    asked by Jennifer on March 9, 2015
  39. Math

    A pilot flew to Montreal and back . The average speed going was 320 mph , and the average speed returning was 480 mph. Find the distance to Montreal if the total flying time was 5 hours.

    asked by norde on August 27, 2015
  40. Physics

    A train is moving parallel and adjacent to a highway with a constant speed of 27 m/s. Ini- tially a car is 60 m behind the train, traveling in the same direction as the train at 41 m/s and accelerating at 5 m/s2. What is the speed of the car just as it

    asked by Julia on October 16, 2013
  41. Physics 1

    Consider an airplane wing of area 15 m2. The airflow speed over the top of the wing is 205 m/s, while the speed across the bottom is 160 m/s. Estimate the thickness of the wing. What is the lift force on the wing at sea level at 0°C? (Use your estimate.)

    asked by Dave on December 5, 2012
  42. math

    A hare is in a 100m race. it starts the race at a particular speed s. halfway through the race, it notices its losing, and increases its speed by an additional 15m/s. Write a formula for how long the hare took on the first half of the race, in terms of s.

    asked by Mary on September 12, 2016
  43. physics

    a car of height H could negotiate a bend on a banked road of certain degree and of radius r with a maximum speed. is it possible for a truck of height 3H to negotiate that same bend with same speed at that same angle.show proof to back the condition

    asked by sandra on June 19, 2010
  44. math, physics

    A motorboat goes upstream on a river and covers the distance between two towns on the riverbank in 6 hours. It covers this distance downstream in 5 hours. If the speed of the stream is 1.5 km/h, find the speed of the boat in still water. [This problem is

    asked by sophie on November 10, 2015
  45. physics

    A girl throws a water-filled balloon at an angle of 50.0∘^\circ above the horizontal with a speed of 12.0m/s{\rm m}/{\rm s} . The horizontal component of the balloon's velocity is directed toward a car that is approaching the girl at a constant speed of

    asked by joe on May 17, 2014
  46. physics

    For cars having the same shape but different size engines the maximum power developed by the car’s engine is proportional to the third power of the car’s maximum speed. Predict the dependence on speed of the wind resistance force.

    asked by Anonymous on October 20, 2017
  47. physics

    Solution of:An air plane ABC R=250m (x=30) the speed of the meachine is 450Km/h in A determine the accelartion supported by the pilot in A and the tangential accelartion is 10m.s determine the speed in B if the tangential accelaration is constant

    asked by Dani on January 22, 2013
  48. Physics

    A train is moving parallel and adjacent to a highway with a constant speed of 27 m/s. Ini- tially a car is 29 m behind the train, traveling in the same direction as the train at 38 m/s and accelerating at 2 m/s2. What is the speed of the car just as it

    asked by Karen on February 20, 2014
  49. Physics

    A train is moving parallel and adjacent to a highway with a constant speed of 22 m/s. Ini- tially a car is 35 m behind the train, traveling in the same direction as the train at 36 m/s and accelerating at 4 m/s2. What is the speed of the car just as it

    asked by Sean on October 2, 2014
  50. physics

    A bird is flying with a speed of 19.0 m/s over water when it accidentally drops a 2.50 kg fish. The acceleration of gravity is 9.81 m/s^2 If the altitude of the bird is 9.00 m and air resistance is disregarded, what is the speed of the fish when it hits

    asked by kyle on November 28, 2012
  51. Physics

    The speed limit on a particular freeway is 28.0 m/s (about 101 km/hour). A car that is merging onto the freeway is capable of accelerating at 6.50 m/s2. If the car is currently traveling forward at 13.0 m/s, what is the shortest amount of time it could

    asked by Mike on November 29, 2010
  52. ice skater world problem

    A skater spins with an angular speed of 12.4 rad/s with her arms outstretched. She lowers her arms, decreasing her moment of inertia by a factor of 8.00. Ignoring friction on the skates, what will be the skater's final angular speed?

    asked by Tessa on April 26, 2010
  53. algebra

    A fish can swim 45 miles downriver in the same amount of time that it can swim 27 miles upriver. Solve for the speed of the current if the speed of the fish is 12 mph in still water. Show all of your work and explain your solution.

    asked by Anonymous on April 30, 2017
  54. physics

    Entrance and exit ramps for freeways are often circular stretches of road. As you go around one at a constant speed, you will experience a constant acceleration. Suppose you drive through an entrance ramp at a modest speed and your acceleration is 3.0 {\rm

    asked by morrow on February 1, 2012
  55. Physics

    Yuvi is trying out for the track & field team and wants to give long jump a try. He currently can reach a distance of 5.90 m when leaving the ground at an angle of 30.0°. (a) What is his takeoff speed? (b) If Yuvi could increase his takeoff speed 5.0%,

    asked by Rob on March 2, 2016
  56. PHYSICS

    Yuvi is trying out for the track & field team and wants to give long jump a try. He currently can reach a distance of 5.90 m when leaving the ground at an angle of 30.0°. (a) What is his takeoff speed? (b) If Yuvi could increase his takeoff speed 5.0%,

    asked by Rob on March 2, 2016
  57. Physics

    A cart of mass M1 = 4.00 kg and initial speed = 4.00 m/s collides head on with a second cart of mass M2 = 2.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision. i keep getting the wrong answer please help me.I

    asked by josh g on March 6, 2008
  58. physics

    a car moving with constant acceleration covers a distance between two points 180m apart in 6 sec.its speed as it passes the second point in 45m/s. what is its acceleration and its speed at the first point? options: 1. -5 m/s^2;15m/s 2. 5 m/s^2;15m/s

    asked by srikala on May 26, 2012
  59. physics

    A bus with a vertical windshiled moves along in a rainstorm at speed V relative to the ground. The raindrops fall vertically with a terminal speed of V' relative to the ground. At what angle do the raindrops strike the windshield?

    asked by ringo on October 8, 2012
  60. Physics

    A truck driver travels 55 km in 1 hour. He then drives a speed of 35km/hr for 2 hrs. Next, he drives 175 km in 3 hrs. What was his average speed? Should i add up the total distance and total time taken then solve?

    asked by Ariel on March 25, 2013
  61. Physics

    A 0.500 kg particle moves in a circle of R=0.0150 m at constant speed. The time for 20 complete revolutions is 31.7 s. What is the period T of the motion? What is the speed of the particle? What is the centripetal acceleration of the particle? What is the

    asked by Nancy on March 5, 2013
  62. physics

    Two persons start at the same place and walk around a circular lake in opposite directions. One has an angular speed of (1.40 x 10^-3) rad/sec. The other has an angular speed of (3.70 x 10^-3) rad/sec. How long (how much time) will it be before they meet?

    asked by Bill on October 12, 2009
  63. calculus

    A ball is thrown straight downward from the top of a tall building, with an initial speed of 30 ft/s. Suppose the ball strikes the ground with a speed of 190 ft/s. How tall is the building? Acceleration is -32 ft/s squared

    asked by Sam on July 24, 2013
  64. physics

    A cyclist is coasting at a steady speed of 17 but enters a muddy stretch where the effective coefficient of friction is 0.60. a)Will the cyclist emerge from the muddy stretch without having to pedal if the mud lasts for 23? b)What will be the speed upon

    asked by Anonymous on October 7, 2012
  65. Physics

    A spring of length 10.0 cm and spring constant 160 kN/m is compressed to a length of 4.00 cm. If, when released, it pushes a block of mass 100 kg, a) what is the speed of the block after it slides up a 15.0 cm hill? b) What is its speed after it falls into

    asked by Alex on April 9, 2015
  66. science

    A graph shows distance on the vertical axis and time on the horizontal axis. If the speed is steadily increasing, and becomes a curved line on the graph, could any part of the speed lone ever become perfectly vertical? Why or why not?

    asked by Judy on April 27, 2010
  67. physics

    Suppose that a sprinter can reach maximum speed by accelerating uniformly for 1.7 seconds. What maximum speed must this sprinter maintain in order to equal the world's record of 19.5 seconds for 200 meters?

    asked by jinky on November 20, 2014
  68. physics

    Am 85kg jogger is heading due east at a speed of 2.0m/s. A 55kg jogger is heading 32 degrees north of east at a speed of 3.0m/s. Find the magnitude and direction of the sum of the momenta of the two joggers.

    asked by Natasha on March 12, 2012
  69. physics

    An astronaut, mass 128.2 kg including spacesuit, pushes off from the International Space Station (mass 110 tons) with a speed of 1.2 m/s. What is the speed of the Space station in the opposite direction? Use 2 s f. for your answer

    asked by allen on June 9, 2014
  70. Physics

    A non-rotating cylindrical disk of moment of inertia I is dropped onto an identical disk rotating at angular speed w. Assuming no external torques, what is the final common angular speed of the two disks?

    asked by Aja on April 21, 2010
  71. Physics

    A coin is projected with speed 6m s-1 (metres per second) along the horizontal surface of a bench. The coefficient of friction between the coin and the surface is 0.7. Modelling the coin as a particle and assuming no air resistance, find the speed of the

    asked by Josep on February 19, 2013
  72. Math

    you are driving at a constant speed of 50 mi/h along a straight road at a constant speed between A and B along the way you pass through city C. the cities B and C are 100 and 25 miles resorctively from city A Use absolute value function to express this

    asked by Tae on June 5, 2012
  73. Physics

    A train is moving parallel and adjacent to a highway with a constant speed of 27 m/s. Initially a car is 41 m behind the train, traveling in the same direction as the train at 39 m/s and accelerating at 4 m/s 2 . What is the speed of the car just as it

    asked by Savannah on November 4, 2012
  74. Physics

    A ball is fired from the ground with an initial speed of 2.38 * 10^3 m/s (approximately seven times the speed of sound) at an initial angle of 56.0° to the horizontal. Neglect air resistance. (a) Find the ball's horizontal range.(m)

    asked by Michelle on October 21, 2012
  75. college math 120

    If a high schol base ball player average pitching speed is 50 ft. in .63 sec. and the average pitch drops 9 mph over 10 ft. What is the player's pitching speed in 50 ft. equivalence(rounded to the tenth).

    asked by cheryl on April 12, 2011
  76. physics-3

    A golf ball at a mini golf course travels 4.2 m along a carpeted green. When the ball reaches the hole 3.0 s later, its speed is 1.3 m/s. Assuming the ball undergoes constant uniform acceleration, what is the ball's initial speed?

    asked by NoNo100 on September 16, 2009
  77. Physics

    A 10kg ball ‘A’ moving at a speed of 8m/s collides with a 20 kg ball B initially at rest. After The collision, the balls A and B move along the direction of 30 & 45 respectively with the initial direction of motion of A. Find the final speed of balls A

    asked by Shrawan on July 15, 2011
  78. college algebra

    A boat can maintain a constant speed of 34 mph relative to the water. The boat makes a trip upstream to a certain point in 21 minutes; the return trip takes 13 minutes. What is the speed of the current?

    asked by Rosanna on June 9, 2010
  79. physics

    An airplane travels 3900 km at 810 km/h, and then encounters a tailwind that boosts its speed to 950 km/h for the next 3000 km. What was the average speed of the plane for this trip? 3900+3000 6900 6900/8 862.5

    asked by jesse on November 8, 2015
  80. Physics

    A person on a rotating stool with arms stretched out rotates at an angular speed of 5.00 rad/s. On bringing in his arms, the angular speed increases to 7.50 rad/s. By what factor does the moment of inertia change?

    asked by Mikhail on November 4, 2013
  81. physics

    Transverse waves with a speed of 50.0 m/s are to be produced on a stretched string. A 5.00m length of string with a total of 60 grams is used. a) what is the required tension in the string? b) calculate the wave speed in the string if the tension is 8.00n.

    asked by yolanda on May 11, 2010
  82. Math

    Have you ever been on an airplane and heard the pilot say that the plane would be a little late because it would be flying into a strong headwind or that even though the plane was taking off a bit late, you would be making up time because you would be

    asked by Megan on March 22, 2017
  83. physics

    A wheel of radius 0.5 m rotates with a constant angular speed about an axis perpendicular to its center. A point on the wheel that is 0.2 m from the center has a tangential speed of 2 m/s. (a) Determine the tangential speed of a point 0.4 m from the center

    asked by Sandhya on October 30, 2008
  84. Economics

    There are 1,000 hot dog stands in Chicago at any given moment. Due to health concerns, a significant number of families move out of the city. Would there be a shift in the demand curve, the supply curve, or both? I'm thinking that if this significant

    asked by Kyle on August 13, 2013
  85. Physics (simple electronics)

    The electronic flash attachment for a camera contains a capacitor for storing the energy used to produce the flash. In one such unit, the potential difference between the plates of a 775 µF capacitor is 330 V. (a) Determine the energy that is used to

    asked by Mike on February 24, 2011
  86. Chemistry

    The reaction for the decomposition of dinitrogen monoxide gas to form an oxygen radical is: N2O(g)==>N2(g)+O(g) . If the activation energy is 250 kJ/mol and the frequency factor is 8.0 x 1011 s-1, what is the rate constant for the first-order reaction at

    asked by gaby on March 1, 2010
  87. Physics

    A ceiling fan has two different angular speed settings: 1 = 475 rev/min and 2 = 170 rev/min. What is the ratio a1/a2 of the centripetal accelerations of a given point on a fan blade? Centripetal acceleration at a distance R and angular speed w is a = R

    asked by CJ on March 15, 2007
  88. Physics

    1. A train whistle has a frequency of 1000 Hz. If the train is speeding at a velocity of 60 km/h past a stationary railroad crossing attendant, what is the apparent frequency a) as the train approaches him, b) as it moves away from him? Assume speed of

    asked by James on November 26, 2009
  89. Math I Have no idea PlEASE help me

    Wind can affect the speed of an airplane. Suppose a plane is flying round-trip from New York City to San Francisco.The plane has a cruising speed of 300 miles per hour.The wind is blowing from west to east at 30 miles per hour. When the plane flies into

    asked by carina on December 23, 2014
  90. Science

    A spring balance attched to the ceiling of an elevator supports a 10N object. In each of the following casses, tell whether there is a net force or none on the object. If there is in what direction does it act? Tell whether the reading in the spring

    asked by Klari on February 25, 2019
  91. physics

    1. A typical household circuit is capable of carrying 15.0 Amps of current at 120 V before the circuit breaker will trip. How many 1500-W hair dryers can run off one such circuit? In the rush to get ready for lecture, a physics professor leaves the hair

    asked by Jay on April 8, 2016
  92. physics

    (1) Dervive an expression for the maximum speed of v of electron in terms of V,me, and e. (2) The electron is replaced with a proton that starts from rest at the positive plate and travels toward the negative plate. Compare the maximum speed of the protons

    asked by monica on February 20, 2012
  93. physics help

    The earth orbits the sun once a year (3.16 10^7 s) in a nearly circular orbit radius 1.50 10^11 m. With respect to the sun, determine the following. (a) the angular speed of the earth 1 rad/s (b) the tangential speed of the earth 2 m/s (c) the magnitude

    asked by john on November 19, 2010
  94. Algebra

    A private plane traveled from Seattle to a rugged​ wilderness, at an average speed of 220 mph. On the return​ trip, the average speed was 264mph. If the total traveling time was 5 hours, how far is Seattle from the​ wilderness?

    asked by Ruby on November 27, 2016
  95. intro to physics

    an athlete executing a long jump leaves the ground at a 28 degree angle and lands 7.6 m away. part a )what was the takeoff speed ? part b) if this speed were increased by just 8.0% , how much longer would the jump be ? for part a) i got roughly 9.48 but i

    asked by emilia on April 21, 2012
  96. physics

    A jetliner, traveling northward, is landing with a speed of 65 m/s. Once the jet touches down, it has 785 m of runway in which to reduce its speed to 5.0 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the

    asked by andrew on September 7, 2010
  97. physics

    A jetliner, traveling northward, is landing with a speed of 72 m/s. Once the jet touches down, it has 730 m of runway in which to reduce its speed to 5.9 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the

    asked by yoyoma on August 17, 2010
  98. physics

    a soccer player kicks a rock horizontally off a 40.0-m-high cliff into a pool of water. if the player hears the sound of the splash 3.00 s later, what was the initial speed given to the rock? assume the speed of sound in air to be 343m/s.

    asked by suzanne on February 28, 2013
  99. physics

    A centrifuge takes 1 minute to turn through 20 complete revolutions before reaching it's final speed. What is the angular acceleration (assumed constant) and what was it's final angular speed in rpm? How do I solve this without knowing the radius of the

    asked by Mark on March 25, 2011
  100. physics

    A jetliner, traveling northward, is landing with a speed of 62 m/s. Once the jet touches down, it has 700 m of runway in which to reduce its speed to 5.6 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the

    asked by annmarie on September 23, 2011

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