physics please HELP !

74,851 results, page 63
  1. Physics

    A 5 N force directed to the west acts on an object for 2.0 seconds. What is the change in momentum of the oject? Would it be 5 X 2?
  2. Physics

    What net external force is required to give a 30 kg suitcase an acceleration of 2.5 m/s2 to the right? Answer in units of N
  3. physics

    Rubidium forms the postive Rb+ Is this ion larger or smaller then the neutral atom? Explain PLEASE
  4. physics

    An elevator weighing 2400 N ascends at a constant speed of 5.0 m/s. How much power must the motor supply to do this?
  5. physics

    A 1100 kg sports car accelerates from 0m/s to 33m/s in 13s What is the average power of the engine?
  6. physics

    How long will it take a 1920 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
  7. Physics

    If a bullet was fired straight up at a speed of 30 m/s what would be the total time for it to return to its starting point?
  8. Physics

    If a bullet was fired straight up at a speed of 30 m/s, what would be the total time for it to return to its starting point?
  9. physics

    How do the acceleration vectors differ on opposite sides of the path for un iform circular motion? How are they the same?
  10. Physics

    If a bullet was fired straight up at a speed of 30 m/s, what would be the total time for it to return to its starting point?
  11. physics

    A force of 10N is used to lift 600-kg ball from the ground to the a height of 1.8m when it is let go. What is the speed of the bal when it is let go?
  12. physics

    A 4430-kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?
  13. Physics

    If a car is going .197 meters per second, how long will it take to go 5 kilometers (assuming the ground is perfectly flat).
  14. physics

    A 1.00 x 10^3 kg sports car accelerates from rest to 25.0 m/s in 7.50 s. What is the average power output of the automobile engine?
  15. PHYSICS

    A girl rows 10 km downstream in 2 h. Her return trip takes 4 h. How fast can she row in still water. in km/h?
  16. physics

    A rock is dropped from a height of 130.0 meters. With what velocity does it land? How long does it take to fall?
  17. Physics

    Two identical gliders slide toward each other on an air track. One moves at 2 m/s and the other at 1 m/s. If they stick together, the combination slides at? Why?
  18. Physics

    What potential energy does a 60.0-kg gymnast acquire in climbing 5.00 m up a vertical pole? GIVEN: mg = 60 h/d = 5.00 m PE = mgh PE = (60)(5.00) PE = 300 J
  19. Physics

    A 2.0-kg rock falls from a height of 25 m to a point 20 m above the ground. How much potential energy does it lose? GIVEN: mg = 2.0 kg h/d = 5 m PE = mgh PE = (2)(5) PE = 10 J
  20. Physics

    In an AC circuit with a frequency 25 Hz producing an rms voltage of 30 V and a 20 farad capacitor, what is the end current?
  21. Physics

    A 155 N force is applied to the end of a 40 cm wrench at a angle of 45 degrees to the handle. What is the torque?
  22. physics

    A yo-yo of radius 10 cm and mass 1 kg is dropped from rest. What is the instantaneous torque on the yo-yo if I hold the string with my fingers?
  23. physics

    How tall would a water-filled manometer have to be in order to measure blood pressures up to 300mm Hg?
  24. PHYSICS HELP

    what is the minimum amount of energy required to accelerate horizontally a 3.0g bullet from rest to a speed of 40.0 m/s?
  25. physics

    A 5.0 m diameter merry-go-round is initially turning with a 4.6 s period. What is the speed of a child on the rim?
  26. Physics

    A 1250 kg car travelling at 60.0 km/h comes to a sudden stop in 35 m. What is the coefficient of friction acting on the brakes?
  27. PHYSICS HELP

    1 1200kg car is accelerating at 1.6m/s/s. If the coefficient of friction is .15, what is the force supplied by the engine? please help! urgent!
  28. Physics

    A skydiver has a terminal velocity of 9.0 m/s. If they have a mass of 98, what is their k value for their air resistance? Use g = 10 m/s/s and do not report units on your answer, they should be N s/m.
  29. AP Physics B

    What is the force of Friction as a 12 kg object slides down for 30 meters down a 30 degrees incline at a constant velocity?
  30. Physics

    A person is travelling 6 km (E) then 4 km (N) and finally 2 km (W). Calculate the average speed And velocity. Show your work
  31. Physics

    Two protons, an infinite distance apart are brought together to a separation of 1 nm. What is the initial potential energy of the system?
  32. physics question

    find the force exerted by proton and the electron in a hydrogen atom they are 5.0 X 10^-19 coulomb
  33. physics

    a block of wood of 200g is thrown vetically with a veloncity of 20mls what is the pontential energy?
  34. physics

    A driver drives 2.5 hours at an average speed of 48MPH. What distance does she travel in this time?
  35. physics

    A driver drives 2.5 hours at an average speed of 48MPH. What distance does she travel in this time?
  36. physics

    14,0 of KOH is neutralised in 1dm^3 of water by sulphuric acid with a concentration at 0,1 mol dm^-3 how do i calculate it
  37. Physics

    a child twirls a yo-yo about in a horizontal circle. The yo-yo has a mass of 0.20 kg and is attached to a string 0.8 m long. what is the velocity of the yo-yo? thanks!
  38. physics

    A 1.56kg seagull dives through the air and gains 4495 of energy.What is the birds speed?
  39. physics

    a ball of mass m is thrown vertically upwards with Vo= 10j m/s. Study nature of motion
  40. Physics

    A boy sledding down a hill accelerates at 1.70 m/s2. If he started from rest, in what distance would he reach a speed of 7.40 m/s?
  41. Physics

    What hanging mass will stretch a 1.9-m-long, 0.54mm - diameter steel wire by 1.2mm ?
  42. Physics

    A boy sledding down a hill accelerates at 1.70 m/s2. If he started from rest, in what distance would he reach a speed of 7.40 m/s?
  43. Physics

    A 2473 kg elephant is walking at 3 m/s on a flat surface. How much kinetic energy does he have? Answer in Joules or J
  44. Physics

    A 2473 kg elephant is walking at 3 m/s on a flat surface. How much kinetic energy does he have? Answer in Joules
  45. Physics

    A spherical piece of metal has a radius of .250m and a mass of 503 kg. what is its specific gravity?
  46. Physics

    If the fundamental frequency of an 70 cm long guitar string is 470 Hz, what is the speed of the traveling waves?
  47. physics

    During a hard sneeze, your eyes might shut for 0.43 s. If you are driving a car at 125 km/h, how far does it move during that time?
  48. Physics

    Does the composition of an object affect the final temperature of in objects. This is in terms of thermal equilibrium.
  49. grade 11 physics

    what is the index of refraction of a medium in which the speed of this radiation is 2.54X10^8 m/s? I don't even know where to start...
  50. Physics

    Calculate the radial acceleration of an object on the ground at the earth's equator in m/s2, turning with the planet.
  51. physics

    According to Newton's version of Kepler's third law, how would the ratio T^2/r^3 change if the mass of the Sun were doubled?
  52. physics

    A hunk of cast concrete with a weight of 10 N will float if it displaces 10 N of water. True or False
  53. Physics

    A 16 kg box slides across the floor with an initial velocity of +7.8 m/s. It comes to a stop after sliding +14.6 m. How much friction was present?
  54. physics

    if the brakes of an automobile are applied from 70km/h to 35km/h, how many meters does the car travel during this deceleration?
  55. physics

    A stone of mass m kg is held h metres above the floor 50s.The workdone in joules over this period is
  56. Health Physics

    As one exhales, what change in energy takes place between the diaphragm and the air in the lungs?
  57. PHYSICS

    The force applied by the e-brake is F(eb) = m*a(eb) = -8.13*1452 = -12,100 N I didn't get the same answer - I got 11,804.76....please check
  58. physics

    Correct the following statement: The racing car rounds the turn at a constant velocity of 145 km/hr.
  59. Physics

    1. A cannon ball M = 10.0kg with V = 2.4×102m/s is broken into 2 parts, if m1 = 6.4kg with angle 37° and m2 with 53°, what is the magnitude of v1 and v2?
  60. physics

    show that the acceleration is 7.5 m/s² for a ball that starts from rest and rolls down a ramp and gains a speed of 30 m/s in 4s
  61. Physics

    What is the frequency of an EM wave emitted most strongly by a glowing element on a stove with temperature 1500 K?
  62. physics

    Show that the acceleration is 7.5 m/s2 for a ball that starts from rest and rolls down a ramp and gains a speed of 30 m/s in 4 s
  63. College Physics

    If the uncertanty in the slope is 1.214×10-14, is the measured value of ε0 within experimental uncertainty of the accepted value? (Yes or No)
  64. Physics

    An airplane is flying at an altitude of 2,000 m with a speed of 216 m/s. What is the pressure of air outside the plane?
  65. Physics

    An airplane is flying at an altitude of 2,000 m with a speed of 216 m/s. What is the pressure of air outside the plane?
  66. Physics

    What equations should I use to calculate the effective value of g, the acceleration of gravity (in meters/second^2), at 5800 km above the earth's surface?
  67. Physics

    a 475 kg pre-stressed concrete beam is to be raised 10.0 m in 24.0 s. how many kw of power is needed to for the job
  68. Physics

    How long does it take for the current in an circuit with = 150Ω and = 65mH to reach half its final value?
  69. physics

    find the bouyant force on a copper obect that displaces 2.8 meters cubed of water
  70. physics

    What is the number of the highest harmonic that could be heard by a person who is capable of hearing frequencies up to 1.00×104 ?
  71. physics

    at time t=0 the driver starts to brae determine how long the bus takes to stop
  72. PHYSICS

    Calculate the radial acceleration of an object on the ground at the earth's equator in m/s2, turning with the planet.
  73. Physics

    torque to move a block of m=200kg for 10m at an angle of 25 degree with a speed of 20m/s.
  74. physics

    Rank, from smallest to largest, the pressures in the tank of motionless fluid shown in the figure.
  75. physics

    If a man weighs 853.0 N on Earth, what would he weigh on Jupiter where the acceleration due to gravity is 25.4 m/s2?
  76. physics

    a cyclist moves around equilateral triangle6kn/h10km/h,12km/hfind average speed?
  77. PHYSICS

    Tin melts at 232 under standard atmospheric pressure. Express this temperature in kelvin
  78. PHYSICS DUE SOON

    A 95.1-g ice cube is initially at 0.0°C. (b) What is the change in entropy of the environment in this process? ___________J/kg
  79. physics

    If a cart is initially travelling at 3.5 m/s, and has a mass of 200g, what is it's kinetic energy (LEAVE OUT units of J)?
  80. physics

    If a man weighs 853.0 N on Earth, what would he weigh on Jupiter where the acceleration due to gravity is 25.4 m/s2?
  81. physics

    Is the mass of an object has an effect velocity with it land on the ground when freely falling from rest?
  82. physics

    a cyclist travels at a distance of 10.0 km. in 30 min. after w/c he speeds up to 40 km/hr for 6.0 more mins. Find his average speed.
  83. Health Physics

    As one exhales, what change in energy takes place between the diaphragm and the air in the lungs?
  84. physics

    a cyclist travels at a distance of 10.0 km. in 30 min. after w/c he speeds up to 40 km/hr for 6.0 more mins. Find his average speed.
  85. physics

    Earth is approximately a sphere of radius 6.37 × 106 m. What are (a) its circumference, (b) its surface area, and (c) its volume? please help
  86. physics

    How long does it take a plane, traveling at a speed of 170 m/s, to fly once around a circle whose radius is 2900 m?
  87. Physics

    What is the frictional force between the tires of a 2000 kg car and an asphalt road if the coefficient of friction is 1.2?
  88. physics

    what force is acting on a circular platform rotating opposite of a person standing on the edge?
  89. physics

    Determine the net force needed to cause a 1310kg sports car to accelerate from 0 - 28.6m/s[fwd] in 5.6 s
  90. physics

    What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 10.5 m/s when going down a slope for 3.18 s?
  91. physics

    Write the equation for fill factor in terms of V_max, V_oc, J_max, and J_sc. FF =
  92. Physics

    What is the resonant frequency in an RLC circuit if R=5 , C=6, and L=12 mH, and V-115 V? (a) 593 (b) 41,400 (c) 1560 (d) 1793
  93. physics

    light from the sun travels 1.5x10km to reach the earth .how long does it journey take in minutes?
  94. physics

    find the force of a toy jeep if the mass is 50kg and is traveling at 4 m/s and the radius is 50 centimeter
  95. physics

    A 50kg person standing on both feet cover a surface about 13 cm x 12 cm. How much pressure is on the sole of their shoes?
  96. Physics

    Is this true or false? All objects moving in a circle are accelerated. I really don't uderstand this question.
  97. physics

    damon,reiny,steve,ms sue.plz get a solution 2 my question please itz urgent!!!
  98. Physics

    If a man weighs 900 N on the earth, what would he weigh on jupiter, where acceleration due to gravity is 25.9 m/s^2?
  99. science(physics)

    a force f= 3i+cj+2k acting on a particle causes displacement , d=-4i+2j+3k. If the work done is 6 joule then the value of c. Plz. Solve
  100. physics

    In the Melde's string apparatus, why there is no standing wave in the segment between the pulley and mass hanger?