physics please HELP !

74,672 results, page 100

  1. physics

    A object is throw up with a speed of 25m/s. suppose that the gravity is 10m/s^2. Define the position and the velocity of the particle for the following times: 1second, 4second and 10second
  2. physics

    A hippo has a mass of 6000kg. When standing on 4 feet, how much pressure is exerted on the ground? Assume each foot has an area of 0.10 square meter. Show your work.
  3. Physics

    White dwarf stars have been observed with a surface temperature as hot as 200,000 o C. What is the wavelength of the maximum intensity produced by this star? help please don't know what to do
  4. physics

    An airplane is flying at constant speed of 500 km/h on a straight line at 33000 feet above sea level. What is the net force acting on the plane?
  5. Physics

    Two packing crates of masses m1 = 10.0 kg and m2 = 6.60 kg are connected by a light string that passes over a frictionless pulley as in the figure. The 6.60-kg crate lies on a smooth incline of angle 37.0°.
  6. PHYSICS!

    0.115 kg of water at 81.0o C is poured into an insulated cup containing 0.220 kg of ice initally at 0o. Calculate the mass of liquid when the system reaches thermal equilibrium.
  7. Physics

    I need to calculate the closest two parallel plates can get before they spark I have the voltage, and will use E=V/dist (rearranged) to get the distance. I THINK the field strength value I should use is 3x10^-6 Vm^-1. No other info is given in the question, so am i close? Thanks
  8. Physics

    During a soccer game two players come from the opposite directions and collide when trying to head the ball. They come to rest in midair and fall to the ground. Describe their initial moments?
  9. Physics: Sound Waves

    Two organ pipes, open at one end but closed at the other, are each. 1.14 m long. One is now lengthened by 2.00 cm. Find the frequency of the beat they produce when playing together in their fundamental.
  10. Physics

    Radio waves travel at the speed of light, which is 3.00 ✕ 108 m/s. What is the wavelength for a FM station broadcasting at 97.9 MHz (the prefix M is "mega" and means 106)?
  11. physics

    A 7000 kg helicopter accelerates upward at 0.70 m/s/s while lifting a 1000 kg car to a mountaintop for a TV commercial photo shoot. -What tension must the cable be able to withstand without breaking?
  12. Physics

    With an average acceleration of negative 1.2m/s squared, how long will it take a cyclist to bring a bicylcle with an initial speed of 6.5 m/s to a complete stop? answers are: either 2.0, 5.4. 0.18 or -1.8s Please help-I am totally confused
  13. Physics

    Compute the entropy change of a system consisting of 1kg of ice at 0•C which melts (reversibly) to water at the same temperature. The latent heat of melting is 79.6 Cal/g
  14. Physics

    Bob (80 kg) lands with a resultant GRF of 1200 N at an angle of 80 degrees from the horizontal. Round answers to nearest whole number. What was his vertical acceleration during landing?
  15. physics

    A ball of mass 1kg is thrown upwards and reaches a maximum height of 4m.Calculate the work done by the force of gravity during vertical displacement.Take g=10m/s
  16. physics

    Given a slab with refractive index n=1.33 and incident light striking the top horizontal face at angle i.The maximum value of i for which total internal reflection occurs is:
  17. Physics

    Calculate the following, expressing the answer in scientific notation with the correct number of significant figures: (8.86 + 1.0 * 10^-3) / 3.610 * 10^-3 please help me write out the equation and fill in the appropriate data thanks for your help Jiskha
  18. physics

    an anti aircraft shell is fired vertically upward with a muzzle velocity of 200 m/sec. Compute theinstantaneous velocities at the ends of 30 & 50 seconds.
  19. Physics

    A 45-kg skater rounds a 5.0-m radius turn at 6.3 m/s. (A.) What are the vertical and horizontal components of the force the ice exerts on her skate blades? (B.) At what angle can she lean without falling over?
  20. Physics

    A 80kg football player stands at the end of a uniform 8m, 50kg diving board supported as shown. Determine the forces exerted by the two supports.
  21. Physics 12 college preparation

    Find the work done by a traveller carrying a suitcase of mass 8.2 kg by pulling up on it when walking forward for a distance of 120 m . Explain your reasoning
  22. physics

    A hippo has a mass of 6000kg. When standing on 4 feet, how much pressure is exerted on the ground? Assume each foot has an area of 0.10 square meter. Show your work.
  23. Physics

    I'm having a bit of trouble with this problem. A ball is thrown upwards and stays in the air for 3.65 seconds. What is the initial velocity? (I use an acceleration of -10 m/s/s) I got an answer of 18.25 m/s/s but I'm not sure that it's correct. I would love some help!
  24. Physics

    The total U.S. consumption of electricity in a particular year was 5.0 x 10^12 kilowatt-hours. What is the mass equivalence of this amount of energy? Show all calculations leading to an answer. How would I solve it?
  25. Physics 2

    A 6 cm high object is placed 43ncm from a converging lens of focal length 24 cm. Find the image’s position and draw a ray diagram approximately to scale.
  26. Physics

    Three objects with masses m1= 36.5 kg m2= 19.2 kg m3= 12.5 kg Are hanging from massless ropes that run over a frictionless pulleys. If the system is released from rest, what is the magnitude of the acceleration in m/s^2 of mass m1? ___________________ O O O I I I I I I I I I I...
  27. PHYSICS

    Two railroad cars, each of mass 7600KG and traveling 85KM/H in opposite directions, collide head-on and come to rest. How much thermal energy is produced in this collision?
  28. Physics

    Calculate the angular momentum and kinetic energy of a solid uniform sphere with a radius of 0.120 m and a mass of 14.0 kg if it is rotating at 6.00 rad/s about an axis through its center..
  29. Physics

    Jill and her friends have built a small rocket that soon after lift-off reaches a speed of 900 m/s How high above the Earth can it rise? Ignore air friction. h=? m
  30. physics

    A object is throw up with a speed of 25m/s. suppose that the gravity is 10m/s^2. Define the position and the velocity of the particle for the following times: 1second, 4second and 10second
  31. Physics

    An alpha particle (charge +2e and mass 6.64 x10-27 kg) is traveling to the right at 1.50 km/s. What uniform electric field (magnitude and direction) is needed to cause it to travel to the left at the same speed after 2.65 s.?
  32. Physics ib

    What is the way to set up an electric circuit with a filament lamp, switch, battery, ohmmeter, voltmeter and variable resistor as to have the most optimal measurement for the current and voltage?
  33. Physics

    Posted by Dan on Thursday, February 21, 2013 at 11:17pm. Plane flying southwest at 155mi/hr. their is a wind from the west at 45.0mi/hr. what's the planes new velocity
  34. physics

    A ping pong ball is rolling across a table top at 22 m/s. If it is 71 m away from the edge, how much acceleration does a person blowing on it need to apply to stop it from falling if they blow for 8.7 seconds?
  35. physics

    A ping pong ball is rolling across a table top at 22 m/s. If it is 71 m away from the edge, how much acceleration does a person blowing on it need to apply to stop it from falling if they blow for 8.7 seconds?
  36. Science Physics

    A 250 kg part falls from a plane and hits the ground at 150 km/h. Find its kinetic energy. Would I need to convert 150km/h to m/s? then multiply with the mass?
  37. Physics

    During a baseball game, a batter hits a pop-up to a fielder 78 m away. The acceleration of gravity is 9.8 m/s^2. If the ball remains in the air for 5.7 s, how high does it rise? Answer in units of m.
  38. Physics

    During a baseball game, a batter hits a pop-up to a fielder 82 m away. The acceleration of gravity is 9.8 m/s2 . If the ball remains in the air for 6.9 s, how high does it rise? Answer in units of m.
  39. Physics

    an airplaine is flying at constant speed of 500 km/h on a straight line at 33000 feet above sea level. what is the net force acting on the airplane?
  40. physics

    a small mass of 2kg tide the string of length 3cm complete 4revolutions in one second in horizontal circle. What is the tangential displacement of the body in 5seconds?
  41. Physics

    Suppose you have a simple circuit that includes a resistance device of 50 ohms, and the current flowing through it is 2.0 amps. Solve for the potential difference of the batteries. 1.0 E2 V 25 V 0.040 V 2.0 E2 V
  42. physics dps

    a light spiral spring is fixed at the top and a mass of 200gms is suspended from its lower end so that it has of 20cm find period of oscillations
  43. physics

    an aeroplane fly upward at 100m/s at an angle 50.when it reached altitude of 900m,a package is throw down. calculate the distance along the groundfrom the point of released
  44. physics

    When brakes applied to a moving car travelling at 60km/hr it decelerates at a uniform rate of 5ms-2. Calculate the time taken to reach a velocity of 36km/hr
  45. Physics-10

    A vehicle that weighs 400N on the surface of the earth is traveling in outer space at a speed of 400m/s. it can be stopped by applying a constant force of 20N for?
  46. physics

    From the roof of a 64 metres high building a ball was thrown which is of 5kg mass.how long it takes to reach the ground? Please show the process with answer
  47. PhYSiCs

    A two end open pipe organ's sixth harmonic is produced by a tuning fork with a frequency of 440 Hz. If it is 17 degrees Celsius, what is the length of the tube?
  48. Physics

    A catcher “gives” with the ball when he catches a 0.179 kg baseball moving at 16.5 m/s. If he moves his glove a distance of 2.25 cm, what is the average force acting on his hand? Answer in units of kN.
  49. physics

    im not sure how to do this question 80 N and 60 N force act concurrently on a point. find magnitude of the vector sum if the forces pull -in the same direction -in opposite direct. -at right angles to each other thanks
  50. 12th grade Physics

    "If a skier coasts down a slope at an angle of 24 degrees below the horizontal, what is her acceleration if the force of friction is negligible?" I must have done this question 15 times, and still can't get the right anwser. Can anyone help me?
  51. physics

    A football is thrown upward at a(n) 23◦ angleto the horizontal. The acceleration of gravity is 9.8 m/s To throw a(n) 52 m pass, what must be the initial speed of the ball? Answer in units of m/s
  52. Physics

    How much force would need to be exerted on a merry-go-round with a mass of 178 kg and a radius of 2.4 m to make the speed of a child sitting on the edge 1.5 m/s within 5 seconds having started from rest?
  53. Physics

    The total U.S. consumption of electricity in a particular year was 5.0 x 1012 kilowatt-hours. What is the mass equivalence of this amount of energy? Show all calculations leading to an answer.
  54. Physics

    A simple pendulum, 2.0 m in length, is released from rest when the support string is at an angle of 25 from the vertical. What is the speed of the suspended mass at the bottom of the swing?
  55. physics

    liquids in general expand on heating but when water in an ordinary glass flask with a narrow neck is heated the level is found to first fall and then rise. why?
  56. physics

    What is the acceleration of two falling sky divers (mass 107.0 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight?
  57. physics

    The acceleration of gravity is 9.8 m/s 2 . What is the magnitude of the total force on a(n) 87 kg driver by the dragster he operates as it accelerates horizontally along a straight line from rest to 41 m/s in 5.3 s? Answer in units of kN
  58. Physics(astronomy)

    Radio waves and x-rays are similar in what: a) comparable wavelengths b) cannot compare c)have same photon energies On the test, it said those and I picked a. Is that correct? I am nervous T_T
  59. Physics

    A container of mass 0.3 kg slides along the ice with a speed of 4 m/s when it reaches a rough section where the coefficient of kinetic friction is 0.8. How long will it take the puck to stop sliding?
  60. physics

    A remote control toy car starts from rest and moves with constant unkown acceleration. After half a second it has travel 0.65m. How far has it traveled after 3 seconds?
  61. physics

    Please show work to how you find this answer. A baseball is thrown with an initial velocity of 30 m/s at an angle of 45 degrees. Neglecting air resistance, how far away will the ball land?
  62. physics

    A cannonball is fired with an angle of 40 degree above the horizontal.If the velocity when it hits the ground is 80 m/s FIND a.Viy b.time of travel c.max height d.range
  63. Physics

    Why is it highly unlikely to find an ion with a charge less than -4 or greater than +4? I need examples of different types of ions and evidence to support the logic using the concepts of ionization energy and electronegativity.
  64. physics

    Rank the beat frequency from highest to lowest for the following pairs of sounds:a. 876 Hz, 871 Hz b. 786 Hz, 784 Hz c. 721 Hz, 728 Hz d. 542 Hz, 541 Hz
  65. Physics

    An object thrown into the air stops at the highest pooint in its path is it in equilbrium at this point explain? I siad yes because it's moving for that one breif moment I wasn't sure or not so I'm asking to see if this is right
  66. physics

    A rock is thrown straight upward with an initial velocity of 9.6 m/s in a location where the acceleration due to gravity has a magnitude of 9.81 m/s^2. To what height does it rise? i got 4.7 can you please show me how to solve for this last one
  67. physics

    A truck sounds its 810 hz horn as it drives outside a house at 30mph. But the occupant's ear detects a frequency of 780hz. What is the temperature of the air at this location?
  68. Physics bobpursley

    Give some examples of applications that resulted from work done by physicists on superconductivity? Don't understand this. I only got wires as an answer which totally doesn't seem correct.
  69. PHYSICS CLASS 9

    A car moves at a speed of 40km/h, It is stopped by applying brakes which produces a uniformacceleration of -0.6m/s2. How much distance will the vehicle move before coming to stop?
  70. Physics

    At a given instant three electrons, in vacuum, happen to lie on a straight line. The first and second are separated by 3.00x 10-6 m, while the second and third are 8.00 10-6 m apart. What is the magnitude of the net electrostatic force on the middle electron, the second one?
  71. Physics/Math help please

    Two particles with positive charges q1 and q2 are separated by a distance s. I got up to here: (kq1)/x^2 = (kq2)/(s-x)^2 I now have to solve for x by cross multiplying and using the quadratic equation but I can't seem to isolate x without it being canceled out. =S
  72. Physics

    A small car has a mass of 300 kg and it is brought to rest in 4 seconds from a speed of 20 metres per second.If there is no resistance to motion,find the force exerted by the brakes
  73. physics

    In the past, ships often carried small cannons that wer used when approaching shore in a dense fog to estimate the distance to the hidden land. How would this work?
  74. physics

    a point charge q is located btween two earthed intersecting conducting planes that are inclined at 60 degree to each other .determine the number of image charges and their location .
  75. PHYSICS!!!

    A skier traveling 12.0 m/s reaches the foot of a steady upward 18 degree incline and glides 12.2 m up along this slope before coming to rest. What was the average coefficient of friction?
  76. Physics

    A cannon is fired at 30 degrees above the horizontal with a velocity of 200 m/s from the edge of a 125 m high cliff. Calculate where the cannonball lands on the level plain below.
  77. physics

    50kg iceskater turns a bend at 7m/sec. if the radius of the curve is 5 meters, what is the centripetal force provided by the friction between the blade of the skate and the ice?
  78. physics

    A large truck (m=3300kg) accelerates from 15 m/s. Neglecting any friction or air resistance, find the average mechanical power that the trucks engine must supply.
  79. Physics

    The acceleration of gravity is 9.8 m/s^2 . What is the magnitude of the total force on a(n) 72 kg driver by the dragster he operates as it accelerates horizontally along a straight line from rest to 61 m/s in 7.8 s? Answer in units of kN
  80. physics

    A 5.0 {\rm nC} point charge sits at x = 0. At the same time, a 3100 {\rm N/C} uniform electric field (created by distant source charges) points in the positive x-direction.
  81. physics

    Imagine that two people having equal weights climb the same flight of stairs. One runs and the other walks. Do they do the same number of Calories of work? Do they have the same power output? Explain.
  82. Physics

    A solenoid 1metre long and radious 4cm has 1000 turns and is carrying 1Ampere current.find the magnetic flux density at the centre.
  83. PHYSICS HELP

    A disk has a moment of inertia of 3.0x10^-4 and rotates with an angular speed of 3.5 rad/sec. WHat net torque must be applied to bring it to rest in 3.0s? can some one help me out with this im lost!!!
  84. Physics

    A linear spring of stiffness k is designed to stop the 20-Mg railroad car traveling at 8 km/h within 400mm after impact. Find the smallest value of k that will produce the desired result.
  85. physics

    liquids in general expand on heating but when water in an ordinary glass flask with a narrow neck is heated the level is found to first fall and then rise why ?
  86. physics

    hey, if someone could please help me solve this: object kicked at 45 degree and travels 82 m b4 hitting the ground. what was its vo? how long was it in the air? how high did it go? tell me if this is right, i got 740m for the height... doesnt sound right..
  87. astronomy/physics

    Mercury has a semi-major axis of 0.367AU and an eccentricity of e=0.206. Calculate its distance to the Sun at perihelion. Remember to use units of AU in your answer.
  88. physics

    A object is throw up with a speed of 25m/s. suppose that the gravity is 10m/s^2. Define the position and the velocity of the particle for the following times: 1second, 4second and 10second
  89. physics

    How deep can a snorkel diver dive if the maximum gauge pressure on the thorax cannot exceed 10.9 kPa? Hint: density of seawater = 1.015g/cm3
  90. physics

    If we apply 300 kJ of heat to 2500 moles of air at constant pressure, what is the change in internal energy? Answer a. 214 kJ. b. 100 kJ. c. 180 kJ. d. 75 kJ.
  91. physics

    many automobile passengers suffer neck injuries when struck by cars from behind. how does newtons law of inertia apply here?why would a headrest help guard against whip-lash
  92. Physics

    An alpha particle (charge +2e and mass 6.64 x10-27 kg) is traveling to the right at 1.50 km/s. What uniform electric field (magnitude and direction) is needed to cause it to travel to the left at the same speed after 2.65 s.?
  93. physics

    A ball of mass 8 kg is thrown vertically upward from the ground , with an initially velocity of 25 m/s. Determine the maximum height to which it will travel if atmospheric resistance is neglected.
  94. Physics Please Help ASAP

    A tungsten target is struck by electrons that have been accelerated from rest through a 38.9-kV potential difference. Find the shortest wavelength of the radiation emitted. (answer has to be in nm)
  95. physics

    A rocket moves upward, starting from rest with an acceleration of 28.5 m/s 2 for 3.09 s. It runs out of fuel at the end of the 3.09 s, but does not stop. How high does it rise above the ground? Answer in units of m
  96. physics

    i do not get this question at all and if u could help it'd be a real HUGE help. solve these equations (sorry i do not have the symbols so i will just write the words out. sorry again for any inconveniance. ): time= 2pi x squareroot of length/gravity ....i know it my seem very ...
  97. physics

    Jane, looking for Tarzan, is running at top speed (4.3 m/s) and grabs a vine hanging vertically from a tall tree in the jungle. How high can she swing upward?
  98. Physics

    At what positions is the speed of a simple harmonic oscillator half its maximum? That is, what values of x / X give v = ±vmax/2 , where X is the amplitude of the motion? Hello, I am so confused about this question. I am not really sure where to start. Thank you so much!
  99. physics

    in a racing competition a car is driving at 69km/h and the driver can complete 8 full circles in 6 mins. calculate the radius of the circular path in meters?
  100. Physics

    Hydro Quebec charges clients by the kilowatt hour. Is this a unit of power, energy or force? If you consume 500kWh per month how would this be expressed in SI units?
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