Physics!

74,561 results, page 8

  1. physics

    A physics student playing with an air hockey table (a frictionless surface) finds that if she gives the puck a velocity of 5.30 m/s along the length (2.80 m) of the table at one end, by the time it has reached the other end the puck has drifted 5.19 cm to the right but still ...
  2. Physics

    I'm trying to solve a Physics problem. I already got the answer correct but I'm unable to do the uncertainties. Can someone please explain how to do in this case? These are the variables used. g = 9.802 m/s2 +/- 0.0005 m/s2 m2 = 951.0 g +/- 2.3 g θ = 31.90º +/- 0.07º ...
  3. Physics

    I'm working on a final physics exam, and I've got everything but these two that I'm stuck on. Any help would be appreciated, and explanations too (: --A------B---(----F---- A and B are both pointing up. 1. ^ In that diagram, the image of object A would be A) real, reduced, and...
  4. Physics

    The figure below represents part of the performance data of a car owned by a proud physics student. (The horizontal axis is marked in increments of 1 s and the vertical axis is marked in increments of 10 m/s.) f (a) Calculate the total distance traveled by computing the area ...
  5. Physics

    The spring shown in the figure is compressed 59cm and used to launch a 100 kg physics student. The track is frictionless until it starts up the incline. The student's coefficient of kinetic friction on the 30∘ incline is 0.14 . k= 80,000 N/m m=100 kg uk= .14 DeltaX= 59 ...
  6. physics - another question

    Sam is sitting in her fishing boat watching a trout swim below the surface. She guesses the apparent depth of the trout at 2.0m. She estimates that her eyes are about 1.0 m above the water's surface, and that the angle at which she's observing the trout is 45 degrees. b) ...
  7. Accident Investigation: Law+Physics

    What exactly do these following driving violations mean? I'm not a driver, so I'm not entirely sure of their meanings... -Following too closely [does that count if a car crashes into another?] -Reckless driving [does that count if a car crashes into another?] -Inadequate ...
  8. Accident Investigation: Law+Physics

    What exactly do these following driving violations mean? I'm not a driver, so I'm not entirely sure of their meanings... -Following too closely [does that count if a car crashes into another?] -Reckless driving [does that count if a car crashes into another?] -Inadequate ...
  9. physics to Elena please reply

    A scuba diver has an air tank with a volume of 0.010 m^3. The air in the tank is initially at a pressure of 1.0x10^7 Pa. Assume that the diver breathes 0.400 L/s of air. Find how long the tank will last at a depth of each of the following. (a) 1.0 m min (b) 10.0 m min Please ...
  10. Physics please clarify

    A charge of +2q is fixed to one corner of a square, while a charge of -3q is fixed to the diagonally opposite corner. Expressed in terms of q, what charge should be fixed to the center of the square, so the potential is zero at each of the two empty corners? For Further ...
  11. Physics

    Hello, I had a question for physics, and I tried it out, however, I got the wrong answer. The Question:If a rock takes 0.750s to hit the ground after being thrown down from a height of 4.80m, determine the rock's initial velocity. My Work : The formula- d=vi*t+1/2*a*t^2 The ...
  12. Physics

    Hello, I had a question for physics, and I tried it out, however, I got the wrong answer. The Question:If a rock takes 0.750s to hit the ground after being thrown down from a height of 4.80m, determine the rock's initial velocity. My Work : The formula- d=vi*t+1/2*a*t^2 The ...
  13. PHYSICS 1

    The vector signs are above each letter (I just don't know how to show it that way) A= 145 units @ 190 deg. B= 75 units @ 288 deg. C= 210 units @ 85 deg. D= 105 units @ 355 deg. How do I use the component Method with these given magnitude and degree??? Physics Component Method...
  14. Science

    Using the second lay of thermodynamics, way energy cannot be recycled? Some energy is lost to entropy increase, and entropy is unusable energy. http://hypertextbook.com/physics/thermal/thermo-second/
  15. College Physics**

    A student goes to planet x and wants to determine the gravity there. The student knows from physics lab that they can use Atwood's machine to determine gravity. The student places a 100g mass and a 110g mass at the end of a string and hangs it over a pulley. The student places...
  16. physics

    Astronomers determine masses of distant objects by observing their smaller companions. For example, they can measure the period of a planet orbiting around a distant star, measure the radius of its circular orbit, and then employ Newtonian physics to determine the mass of the ...
  17. physics

    Astronomers determine masses of distant objects by observing their smaller companions. For example, they can measure the period of a planet orbiting around a distant star, measure the radius of its circular orbit, and then employ Newtonian physics to determine the mass of the ...
  18. Physics

    Hello can someone please help me with this physics question and show the work so I can understand? A box at the top of a rough incline possesses 981 joules more gravitational potential energy than it does at the bottom. As the box slides to the bottom of the incline, 245 ...
  19. Physics

    A frustrated hockey player, at rest on a frictionless ice rink, throws his stick into the crowd. Since you don’t normally go to hockey games, you decide to turn this into a physics problem and calculate the mass of this player. You observe that the stick is thrown with a ...
  20. physics

    Two radio antennas simultaneously transmit identical signals with a wavelength of 3.35 m. A radio several miles away in a car traveling parallel to the straight line between the antennas receives the signlas. If the second maximum is located at an angle of 1.28 degrees north ...
  21. physics

    hi i have a physics question i don't understand here is the question A sample of blood is placed in a centrifuge of radius 15 cm. the mass of the corpuscle is 3.0*10^-16 kg, and the magnitude of the force required to make it settle out of the plasma is 4.0X10^-11 N. At how ...
  22. Chemistry

    What is ment by a "derived unit." http://www.physics.nist.gov/cuu/Units/units.html
  23. Physics-totally bewildered!!

    I have a physics question. This is for extra credit which I really need to earn- If I made a solar cell how would I know which material is best to use if given choices like aluminum with a work function of 4.1eV at a cost of 2.40Kg or platinum with a work function of 6.4 eV at...
  24. Physics

    The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. (a) Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed of a person situated at the equator. (b) What ...
  25. Self assembly

    Can self assembly of macromolecules occur in vivo? I think it does occur. DNA, RNA, polypeptides, etc. http://www.worldscibooks.com/physics/5347.html
  26. physics

    Hi! I need a bit of help with 10 Physics problems. I have about 70, but these are the ones I either didn't get or needed help with. Thank you so much!! What is the decimal equivalent of 3.14 × 10 7? What is the decimal equivalent of 2.8 e-4? (In the JavaScript web language, ...
  27. Physics

    someone please answer these Physics Q answers no explanation 1 What is the opposite force to gravity 2 an example of a contact force 3 an example of a non-contact force 4 What effect does ‘mass’ have on inertia 5 two examples of forces that could slow an object down 6 two ...
  28. Check my physics

    Would you mind checking one of my problems from my physics study guide? I know the answer and just want to make sure I am using the right formula. :) A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground. a. Determine the kinetic energy possessed by ...
  29. physics

    Identify the area of physics that is most relevant to each of the following situations. Explain your reasoning. a. a high school football game b. food preperation for the prom c. playing in the school band d. lightning in a thunderstorm e. wearing a pair of sunglasses outside ...
  30. Science: Physics

    A physics teacher shoots a .30 caliber rifle at a 0.47 kg block of wood. The rifle and wood are mounted on separate carts that sit atop an air track (like a linear air hockey table--ie. frictionless). The 5.7 kg rifle fires a 27 gram bullet at 227 m/s in the positive direction...
  31. physics

    The flywheel of a steam engine runs with a constant angular speed of 164 rev/min. When steam is shut off, the friction of the bearings and the air brings the wheel to rest in 1.6 h. I figured out the constant angular acceleration=1.71 rev/min2 but im not sure how to find:What ...
  32. physics

    hi thank you for your help: i have a question that deals with finding the direction and magnitude of the net magnetic force on a loop that is next to a wire (the loop is in the wire's magnetic field) how do i set up a question like this? do i have to integrate since the far ...
  33. Science-Physics: Space Station

    Hello, I am having trouble with this physics problem. Any suggestions with this? Sketch and calculate a spacestation that would meet the requirement of having a 2m tall person experience a 10 % difference in centripetal acceleration between bottom of feet and top of head when ...
  34. Physics

    an 80 kg physics student is riding the cajun cliffhanger. this ride had a diameter of 8.0m (u:0.06)the ride produces enough centripetal force to suspend a student. 1.what is the force of friction to keep the student suspended? 2.what normal force is required to generate the ...
  35. Physics

    A 0.20-kg ball on a string is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the string tension is 16 N. Find the tensions in the string when the ball is at twelve o'clock and at the six o'clock positions. * Physics - ...
  36. physics

    Here's a physics problem. I don't care about the answer, i just want to know how to do it. don't have to be too detailed.. but i don't really kno how to start this 1.) A model rocket blasts off from the ground rising straight upward with a constant acceleration that has a ...
  37. Physics

    Your 2.85kg physics book rests on a horizontal tabletop. A. Find the normal force on the book. B. Suppose you pull up on the book with a 15.0N force, now what's the normal force? C. Suppose you push down on the book 15.0N Force now what's the normal force?
  38. physics

    A car travelling at 60 km/h hits a bridge abutment. A passenger in the car moves forward a distance of 67 cm (with respect to the road) while being brought to rest by an inflated air bag. What force (assumed constant) acts on the passenger¡¦s upper torso, which has a mass of...
  39. Physics

    This is how the problem starts out: A meter stick is placed with the fulcrum at the 50-cm mark. If a 120-g mass is placed at the 25-cm mark and a 25-g mass at the 10-cm mark, where should a 500-g mass be placed to balance the system? I thought that since the two masses (the ...
  40. physics

    A skier is gliding along at 1.13 m/s on horizontal, frictionless snow. He suddenly starts down a 13.1° incline. His speed at the bottom is 18.8 m/s. What is the length of the incline? ------------------------------------ Use his change in kinetic energy to get his loss of ...
  41. Physics-Totally lost

    I'm totally lost on this one- the earth is surrounded by an electric field with a strenth of 100 N/C at the surface. Its electric properties are the same as a point charge located at its center. How would the gravatational force and electrical force compare foor an electron at...
  42. AP Physics

    Hi, I have the follwoing physics question to ask, Plesae help with hints. "Two people are standing on a 2.5-m-long platform, one at each end. The platform floats parallel to the ground on a cushion of air, like a hovercraft. One person throws a 5.9-kg ball to the other, who ...
  43. PHYSICS PLEASE HELP

    A very large firecracker explodes in the hallway into 3 fragments. Physics students rush to the scene to enrich their knowledge of the law of conservation of momentum. They report that Fragment 1: mass=1.23kg, v=8.70m/s, north Fragment 2: mass =2.60kg,v=6.10m/s,east fragment 3...
  44. Ven diagram

    70 students are stydying physics mathematics and chemistry. 40 students study mathematics, 35 study physics and 30 students students chemistry.15 students are studying all the subjects. How many students are studying exactly two of the subjects?
  45. Physics please clarify

    Posted by Mary on Monday, September 3, 2007 at 12:40pm. download mp3 free instrumental remix A charge of +2q is fixed to one corner of a square, while a charge of -3q is fixed to the diagonally opposite corner. Expressed in terms of q, what charge should be fixed to the center...
  46. Physics need work checked

    Physics lenses. Please help, my math is wrong and I need second opinion.? Consider three lenses with focal lengths of 25.9 cm, -15.8 cm, and 10.0 cm positioned on the x axis at x1 = 0 m, x2 = 0.412 m, and x3 = 0.514 m, respectively. An object is at d = -121 cm. Find the ...
  47. Physics Help

    Hey, ok so I am supposed to be helping my cousin this with this physics problem, and this is the only one that has ever stumped me! Neutral metal spheres A and B each of mass 0.2 kg hang from insulating wires that are 4.0 m long and are initially touching. An identical metal ...
  48. Physics

    You are at standing at a window in the University tower that is 42.0 meter above the ground. Your physics professor (who is 2.12 m tall) is walking on the ground below, approaching to tower at a speed of 1.12 m/s. You are holding an egg, which you would like to drop on your ...
  49. physics

    Physics Gravitation help...? hello People i need some help with my physics revision sheet. i cant seem to get my head round it. if anyone could help by telling me how to work it out to get the right answer i would be grateful... answers would also be appreciated. ok here is ...
  50. physics

    The physics of energy and Earth's moon as a satellite. The moon is an Earth satellite of mass 7.35 x 10^22 kg, whose average distance from the centre of Earth is 3.85 x 10^8 m. a) What is the gravitational potential energy of the moon with respect to Earth? b) What is the ...
  51. Math/Physics(Please check work)

    For an experiment on specific heat capacities of metal in physics, I am trying to calculate my percent error but am having some trouble. After collecting my experimental data for c (cal/g) for the object that was used which was aluminum my results are: trial 1 = .19 trial 2...
  52. Physics please someone help me

    A scuba diver has an air tank with a volume of 0.010 m^3. The air in the tank is initially at a pressure of 1.0x10^7 Pa. Assume that the diver breathes 0.400 L/s of air. Find how long the tank will last at a depth of each of the following. (a) 1.0 m min (b) 10.0 m min Please ...
  53. physics

    Often in physics we won't be able to predict motion of a bunch of objects exactly and so we resort to statistical methods. An example of a statistical approach is the resulting profile of a bunch of disks dropped through a series of pegs. As each disk falls it encounters pegs ...
  54. Physics-Please check calc

    I did this problem last night with Damon's help and I think it's correct at the end of the is-could you please check it? Calculate amount of energy needed to completely vaporize a 50g piece of 20 degree C silver melting point 1064 C L(f) = 64KJ/Kg Boiling point 2856C L(v) = ...
  55. physics... PLEASE HELP

    A typical laser used in introductory physics laboratories produces a continuous beam of light about 1.0 mm in diameter. The average power of such a laser is 0.75 mW. (i) What is the average intensity? (ii) What is the peak intensity? (iii) What is the average energy density of...
  56. physics/math

    Joe is a former basketball player who is now a work-out junkie, and especially loves to do push-ups. He was a good athlete, but not so good at science in school, especally not good in Physics. He wants you, yes you, to calculate how much work he does, in strict terms of ...
  57. Physics

    A student gets his car stuck in a snow drift. Not at a loss, having studied physics, he attaches one end of a stout rope to the vehicle and the other end to the trunk of a nearby tree, allowing for a small amount of slack. The student then exerts a force vector F on the center...
  58. Physics

    A hockey puck of mass m = 70 g is attached to a string that passes through a hole in the center of a table, as shown in the figure below. The hockey puck moves in a circle of radius r = 1.20 m. Tied to the other end of the string, and hanging vertically beneath the table, is a...
  59. Physics

    For a physics lab involving watchnig a gldier move down an air track with uniform acceleration, and recording the results in a table then graphing the results,do I include that "Observations were held and results were recorded in a table. Two graphs, one position-time and one ...
  60. Physics Repost

    Hey, ok so I am supposed to be helping my cousin this with this physics problem, and this is the only one that has ever stumped me! Neutral metal spheres A and B each of mass 0.2 kg hang from insulating wires that are 4.0 m long and are initially touching. An identical metal ...
  61. Physics-please check-this can't be right

    I asked about a golf ball hit at a 35 degree angle and the hole was 175 m away. What was speed of ball. I got a response, and it follows with my response. I'm not doing something right, can you help, please.Physics - drwls, Saturday, October 9, 2010 at 10:20am You can come up ...
  62. PHYSICS!!!

    A hypodermic syringe contains a medicine with the density of water (figure below). The barrel of the syringe has a cross-sectional area of 2.89 10-5 m2. In the absence of a force on the plunger, the pressure everywhere is 1.00 atm. A force of magnitude 2.13 N is exerted on the...
  63. physics - last question

    Sam is sitting in her fishing boat watching a trout swim below the surface. She guesses the apparent depth of the trout at 2.0m. She estimates that her eyes are about 1.0 m above the water's surface, and that the angle at which she's observing the trout is 45 degrees. b) ...
  64. physics

    . An inquisitive physics student and mountain climber climbs a 50.0-m cliff that overhangs a calm pool of water. He throws two stones vertically downward, 1.00 s apart, and observes that they cause a single splash. The first stone has an initial speed of 2.00 m/s. (a) How long...
  65. Physics

    A block of mass 20g sits at rest on a plate that is at the top of the fluid on one side of a u-tube as shown in figure P10.38. The u tube contains two different fluids with densities p1= 1000 kg/m^3 and p2= 600 kg/m^3 and has a cross sectional area of A= 5.0 x10^-4 m^2. If the...
  66. Physics

    A 930 kg sports car collides into the rear end of a 2500 kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.6 m before stopping. The police officer, knowing that the coefficient of kinetic friction between tires and road is ...
  67. Physics

    Two geekie physics students with a combined mass of 131 kg jump into their old car to run out for some late night pizza. The distance between the front and back axles of the car is 2.9 m. When they get in the car, the springs compress a total of 9.3 cm. On their way to the ...
  68. physics

    The ammeter your physics instructor uses for in class demonstrations has a resistance R(g)= 60 ohms and requires a current of 1.0 mA for a full scale deflection. The same ammeter can be used to measure currents of much greater values by wiring a shunt resistor of relatively ...
  69. statistics

    Leslie took two midterm exams and earned the following scores: 82 on the chemistry exam (class distribution: μ = 75, σ = 6.25) and 63 on the physics exam (class distribution: μ = 59, σ = 3.57). Rounding to two decimal points, on which exam should Leslie get...
  70. Physics

    I calculated tan and sin (theta) for a physics lab experiment -- two-slit interference I had to use this equation y = L tan (theta), with y = 0.25 and L = 2 and tan (theta) came out to be 7.12 in degrees and 0.1243 in radians. I found sin (theta) by using the triangle for X^2...
  71. PHYSICS PLEASE HELP ASAP

    When an object is placed 55.0cm from a certain converging lens, it forms a real image. When the object is moved to 45.0cm from the lens, the image moves 6.00 cm farther from the lens. Find the focal length of this lens? Please someone help me out I tried so many times i keep ...
  72. Physics, still don't get it!

    I'm sorry bobpursley I don't understand your response, please clarify. When an object of mass m1 is hung on a vertical spring and set into vertical simple harmonic motion, its frequency is 12 Hz. When another object of mass m2 is hung on the spring along with m1, the frequency...
  73. physics

    One student is pushing on a chair with a force of 260.6 N directed at an angle of 30 degrees above horizontal while a second student pushes on the same side of the chair with a force of 21.0 N at an angle of 15 degrees below horizontal. What is the magnitude, in N, of the sum ...
  74. physics

    A 25-kg bullet traveling shoots into a physics textbook that is 3.5 cm wide, and exits the textbook traveling 40 m/s. Poor defenseless textbook! (A) What was the magnitude of the average deceleration of the bullet while it was penetrating through the textbook? (B) What was the...
  75. Physics

    A spring has a spring constant that is 120 N/m, and has a 0.1 kg block attached to it. The spring and mass sit on a horizontal surface that has no friction. The block is pulled 0.2 m and then released. Please find the frequency of the oscillations, the period of the ...
  76. Physics - forces acting at an angle

    The physics of tobogganing and forces at an angle: A child is tobogganing down a hillside. The child and the toboggan together have a mass of 50.0kg. The slope is at an angle of 30.0 degrees to the horizontal. Assume that the positive y-direction is pointing in the direction ...
  77. physics

    In a classroom demonstration, a 790-N physics professor lies on a “bed of nails.” The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. While the professor is lying down, ...
  78. Physics

    A dedicated physics student pulls his brand new shiny red wagon along a level road such that the handle makes an angle of 50 degrees with the horizontal road. if he pulls on the handle with a force of 85N, what is the horizontal component of the force he exerts along the ...
  79. Physics

    These are “plug-in-the-number” tasks to familiarize you with the main formulas that link the physics concepts of this chapter. They are one-step substitutions, much less challenging than the Think and Solve problems that follow. Average speed ! total distance covered ...
  80. physics

    I am a bit of an overachiever, and I've developed a habit of reviewing subjects during the summer before I take them in the new year. I was just looking through the posts on this site for review, when a certain physics question caught my attention. It was posted by "bobby on ...
  81. physics

    Spaceship I, which contains students taking a physics exam, approaches Earth with a speed of 0.640 c, while spaceship II, which contains instructors proctoring the exam, moves away from Earth at 0.280 c, as in Figure P26.27. If the instructors in spaceship II stop the exam ...
  82. physics

    Spaceship I, which contains students taking a physics exam, approaches Earth with a speed of 0.640 c, while spaceship II, which contains instructors proctoring the exam, moves away from Earth at 0.280 c, as in Figure P26.27. If the instructors in spaceship II stop the exam ...
  83. emmanuel

    in a class of 60 student,26 offer mathmatic and 28 offer physics if 8 student do not offer any of the two subject (1)how many student offer both subject. (2)how many student offer mathematic only. (3)how many student offer physics only. (4)how many student offer only one ...
  84. Physics

    Block B weighs 716 N. The coefficient of static friction between block and table is 0.31. Assume that the cord between B and the knot is horizontal. Find the maximum weight of block A for which the system will be stationary. The figure has block B on a table and to the right ...
  85. Physics

    B)In physics (and in all science) standard units are used to ensure measurement uniformity. Which of the following fictitious units of measurement could not be considered a standard unit? 1) The grimph: a distance unit equal to exactly 4 meters. 2) The nicket: a time unit ...
  86. Brain Teaser

    When Professor Sum was asked by Mr. Little how many students were in his classes, he answered, “All of them study either languages, physics, or not at all. One-half of them study languages only, one-fourth of them study French, one-seventh of them study physics only, and 20 ...
  87. physics.

    26.
  88. physics

    what is physics?
  89. Physics

    1)
  90. Physics

    CAN ANYONE HELP ME WITH PHYSICS!!!!!!!!!!
  91. AP Physics

    K=1/2(6.6 x 10^2 kg)(2.11 x 10^4 m/s)^2
  92. Physics

    M/5=30 M=?
  93. physics

    What is physics?
  94. physics

    1/2(v0+v)(v-v0) ----- (a)
  95. physics

    1/2(v0 + v) (v- v0)/ (a)
  96. physics

    1/2(v0 + v) (v- v0)/ (a) =
  97. physics

    what is an e.m.f
  98. Physics

    The
  99. Physics

    (5x^-3)^2
  100. physics

    jk
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