physics please HELP !

74,755 results, page 7
  1. Physics 11 steve or any physics teacher helpURGENT

    A 30kg student pushes a 20kg box on a frictionless surface. If student accelerates at 0.80 m/s^2, what is acceleration of the box. My question is why does the box accelerate in opposite direction of the boy, and how does the frictionless surface affect
  2. Physics

    In a demonstration in physics class, a 1.2 kg dynamics cart starts from rest at the top of a ramp. the ramp is 2.4 m above the ground. the cart then rolls down to the bottom of the ramp, where it collides with a stationary 1.4 kg dynamics cart. Assume that
  3. Physics

    I have to compare and contrast three types of tires, and relate them to physics. I've chosen: <li> Racing tires <li> Winter tires <li> All season tires I've chosen to compare them on: <li> Tire tread pattern <li> Rubber
  4. Physics

    You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. You shoot the gun straight up, and it takes 36.761s for the dart to land back at the barrel. What is the maximum
  5. 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
  6. 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
  7. 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
  8. Physics Project

    I am currently doing a physics project where I am launching a wooden pellet by using a sling into a container full of water. By changing the length the rubber band is stretched, I am measuring the pellet's submergence distance into water. I know that the
  9. Physics I for College

    a rope that makes an angle of 30 degrees with the horizontal drags a crate along the floor. what must be the tension in the rope if a horizontal force of 40N is needed to drag the crate? please help me. i really didn't understand what my professor told me.
  10. Physics- drwls please check

    Good morning. This is a repost. The system is telling me my calculations is incorrect. I thought a fresh pair of eyes would help. Suppose a monatomic ideal gas is contained within a vertical cylinder that is fitted with a movable piston. The piston is
  11. physics

    A 2.5 kg block of ice at a temperature of 0.0 degrees Celcius and an initial speed of 5.7 m/s slides across a level floor. If 3.3 x 10^5 J are required to melt 1.0 kg of ice, how much ice melts, assuming that the initial kinetic energy of the ice block is
  12. 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
  13. 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
  14. physics

    The human brain consumes about 23.7 W of power under normal conditions, though more power may be required during exams. How long can one candy bar (332 Calories per bar) power the normally functioning brain? (Note: The nutritional Calorie is equivalent to
  15. Physics

    Physics Report! What should i write..please help me need ideas !best answer!? Well First my report should be focused on Circular Motion OR Energy and momentum All the report says is to spend a day or two analysing the world around you in terms of Linear
  16. Physics

    Hello, I'm totally lost on how to solve this physics problem. Where/how do I insert the variables?? "Light travels from one material with a refractive index (n1=1.5) to another material with refractive index (n2=1.7). If it strikes the surface at a 45°
  17. Physics

    i saw this question from physics book, can someone please help me solve this.. thank you.. A man pulls a 500 Newton block up a plane inclined 300 with the horizontal with a force of 300 Newton parallel to the plane. What net force tends to pull the block
  18. Physics -please help

    This is for my earth science class I have not had physics- If a person pulls on a cart to the right with a force of 10 N and a second person pulls to the left with a force of 3 N, what is the net force(+direction)on the cart? I came up with 130 N downward
  19. Physics

    For a question in physics... I was told to draw a graph of vertical displacement, y, versus time, t, in 2sec increments from 0 to 1.8. What was given to me was: v_yo_= +10m/s v_xo_= +5m/s a_y_ = -10m/s^2 So I used the formula: y=vo+1/2at^2 I drew the
  20. Physics / Astronomy

    Here is my question: Consider the bending of light by the gravitation of the Sun as described by Newtonian physics. Light of frequency f passes at a distance d from the center of the Sun, which has a mass M. Show that the bending angle of the light is
  21. Physics

    A thickness planer is a machine that uses a rotating blade to shave a thin layer of wood off the top of the surface. While operating, a piece of wood is inserted such that it causes the machine to struggle and slow down due to resistance of the lumber.
  22. Physics

    In a physics experiment, 250g of water is placed in a 50g calorimeter cup made of aluminum when both are at 15C. Steam at 100C is completely absorbed by passing it through the water, raising the temperature of water and cup to 45C. Find the mass of steam
  23. Physics

    In a physics experiment, 250g of water is placed in a 50g calorimeter cup made of aluminum when both are at 15C. Steam at 100C is completely absorbed by passing it through the water, raising the temperature of water and cup to 45C. Find the mass of steam
  24. Physics repost

    A wave traveling in the +x direction has an amplitude of 0.45 m, a speed of 6.1 m/s, and a frequency of 16 Hz. Write the equation of the wave in the form given by either Equation 16.3 or 16.4. (Answer in terms of t and x. Assume standard units.) For
  25. Physics

    if it takes 726 watts of power to move a mass 36 meters in 14 seeconds, what is the mass? i really need like, step by step help please? asap. thanks, michelle . physics - bobpursley, Saturday, November 20, 2010 at 4:06pm power= work/time=
  26. Probability

    48% of the students in the school are female and the probability of taking of physics is independent of the gender of the student, what is the probability that a student chosen at random is both a female and taking physics?
  27. Physics

    The human brain consumes about 21.3 W of power under normal conditions. (More power may be required during exams...) How long can a candy bar (299 Calories) power the normally functioning brain? Note: The nutritional Calorie is equivalent to 1000 calories,
  28. Physics

    Mark's physics book is on the desk. Mark pushes horizontally (from the side) on the book, but the book does not move. Which force diagram represents the force on the physics book? You may neglect air resistance. a) A box with two arrows, one pointing up
  29. physics

    In the physics equation F=qE, where E is the electric field, q is the charge, and F is the force that the electric field exerts on this charge, does the charge, q, by itself have a direction associated with it? Why or why not?
  30. Physics Please COULD SOMEONE HELP ME ASAP PLZ

    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
  31. Physics

    Physics lab need help with sources of error. In our lab, we had to use carbon tape and a spark timer to find out the maximum velocity and maximum acceleration of a high school student. I'm having a hard time to find sources of errors. Any ideas or insights
  32. physics

    my physics teacher said that in simple harmonic motion of simple pendulum the direction of torque acting is opposite to angular displacement now i am wondering how ?as angular displacement is either anticlockwise or clockwise and torque direction is
  33. physics

    A) A ball is thrown vertically upward with a speed of 27.6 m/s from a height of 1.9 m. How long does it take to reach its highest point? The acceleration of gravity is 9.81 m/s2. Answer in units of s B) How long does the ball take to hit the ground after
  34. Physics repost please check

    Good morning. This is a repost. The system is telling me my calculations is incorrect. I thought a fresh pair of eyes would help. Please tell me what I am doing wrong. Suppose a monatomic ideal gas is contained within a vertical cylinder that is fitted
  35. physics

    1. You are planning to build a mini hydro power plant. A river near your home is w = 4.0 m wide and h = 1.0 m deep. You measure the water flow to be v = 1.50 m/s over the brink of a waterfall H = 10.0 m high. The company that makes the turbine advertises e
  36. Physics/Math

    A single force acts on a 5.0 kg particle-like object in such a way that the position of the object as a function of time is given by x = 3.0t - 4.0t 2 + 1.0t 3, with x in meters and t in seconds. Find the work done on the object by the force from t = 0 to
  37. 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
  38. 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
  39. 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
  40. physics

    a sea saw consist of a uniform bar 4m long and of mass 2kg. a boy of weight 42N sits at end of the sea saw while another boy of weight 38N sits at the end of the season. at what point must the season be pivoted if it is to balance. according to physics
  41. physics

    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
  42. physics

    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
  43. 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
  44. physics

    A 750-N physics student carries a 4.0 meter board, uniform in shape, and 190 newtons in weight to our swimming pool. The student then places the board on the deck and next to the pool in such a way so 1.5 meters of the board extends out over the edge of
  45. Physics

    A block attached to a spring with unknown spring constant oscillates with a period of 7.0 s. Parts a to d are independent questions, each referring to the initial situation. What is the period if... The mass is doubled? The mass is halved? The amplitude is
  46. physics

    Posted by michelle quendarsv on Saturday, November 20, 2010 at 3:55pm. if it takes 726 watts of power to move a mass 36 meters in 14 seeconds, what is the mass? i really need like, step by step help please? asap. thanks, michelle . physics - bobpursley,
  47. physics

    another question: the 20 kg block is at the top of a 10 m long inclined plane. The block starts from rest and slides without friction down the length of the incline. The block is 5 m high. 1) Determine the gravitational potential energy of the block at the
  48. physics

    In Physics, it is important to use mathemat- ical approximations. For instance, in a small angle approximation, tan α ∼ sin α . Find the largest angle α for which the dif- ference of sin α − tan α is less than 3.52% of
  49. physics

    4. The physics class is having a tug of war – the men against the women. For a long time the two teams are pulling with equal force and the knot in the centre of the rope isn’t going anywhere. But then one boy sneezes and stops pulling as hard for just
  50. 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
  51. Physics

    Posted by Adam on Thursday, August 13, 2009 at 11:08am. In the figure take q1 = 22uC and q2 = 20u. The force on q_1 points in the - x direction, What is the magnitude of the force on q_1? I don't know where to start, can someone help me? Responses Physics
  52. physics

    Apparent Weight. A physics student weighing 600 N stands on a bathroom scale in an elevator. As the elevator starts moving, the scale reads 420 N . A )Find the magnitude of the acceleration of the elevator. B ) Find the direction of the acceleration of the
  53. Physics

    i have been asking physics questions on this and some people give me the formula, i'm getting the correct answers..please can the same people help me on this that helped me before.. A child rides a bicycle in a circular path with a radius of 2.0 m. The
  54. PHYSICS

    can someone help me with physics lab homework please: load 300 g at 60 degree mass at 180 deg 150 g mass at 270 deg 260 g for step two resolution of 300-g at 60 degree f load= fx'= fy'= percent error for each component for setup II? WOULD THE HYPOTHETICAL
  55. Physics

    For this problem, ignore air resistance. You are to fire a rifle that shoots a particular bullet at 460 m/s at a target that is 45.7 m away and level with the rifle. Assuming that the acceleration due to gravity is 9.80 m/s², how high above the target
  56. Physics

    For this problem, ignore air resistance. You are to fire a rifle that shoots a particular bullet at 460 m/s at a target that is 45.7 m away and level with the rifle. Assuming that the acceleration due to gravity is 9.80 m/s², how high above the target
  57. Physics

    Which of the following best describes kinematics? a) Kinematics is a part of mechanics that involves the description of motion. b) Kinematics is the branch of physics that deals with the motion of objects and the action of forces on the objects.
  58. 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
  59. physics

    In preparation for a demonstration on conservation of energy, a professor attaches a 7.2-kg bowling ball to a 3.4-m-long rope. He pulls the ball 23° away from the vertical and holds the ball while he discusses the physics principles involved. Assume that
  60. 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
  61. physics

    This question was partially answered, if you could just help clarify that would be really great!!! Hi~ Thank you for your help~ Imagine you are on an island and you have two coconuts. The coconuts are launched with the same initial velocity. The trajectory
  62. Physics

    A 855 N crate rests on the floor. a) How much work is required to move it at constant speed 7.7 m along the floor against a friction force of 180 N? b) How much work is required to move it at constant speed 7.7 m vertically? I really NEED help I am very
  63. physics

    what is the physics behind the process of administering the following 1. measurement of blood pressure using sphygmomanometer 2.giving injections 3.administering intravenous infusion 4.giving oxygen in the ward and operating theater 5. administering blood
  64. 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
  65. physics

    Juan was on vacation in Italy, and one of this adventures, he went up the Pisa tower. He wants to know the tower height using Physics, so he drops a small stone that he has in his pocket and takes the time it lasts to reach the ground. What is the Pisa
  66. Physics

    A not so brilliant physics students wants to jump from their 3rd floor apartment window to the swimming pool below. The problem is the base of the apartment is 8.00 meters from the pool’s edge. If the window is 20.0 meters high, how fast does the student
  67. Physics

    You and your friends are doing physics experiments on a frozenpond that serves as a frictionless, horizontal surface. Sam,with mass 80.0 kg, is given a push and slides eastward. Abigail, with mass 50.0 kg, is sent sliding northward. Theycollide and after
  68. 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
  69. PHYSICS HELP!

    A compact car has a mass of 1400kg. Assume that the car has one spring on each wheel, that the springs are identical, and that the mass is equally distributed over the four springs. What is the spring constant of each spring if the empty car bounces up and
  70. 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
  71. physics

    You are watching an archery tournament when you start wondering how fast an arrow is shot from the bow. Remembering your physics, you ask one of the archers to shoot an arrow parallel to the ground. Unfortunately the archer stands on an elevated platform
  72. Physics to bobpursley or any1 else who knows this

    A planet has two satellite moons. Moon X has an orbital period of 2.13 days. Moon Y has an orbital period of about 3.53 days. Both moons have nearly circular orbits. Use Kepler's third law to find the distance of each satellite from the planet's center.
  73. 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
  74. physics

    Hello I'm having trouble with this physics question: You are examining the loss in intensity as light passes through a fibre optic cable. The input intensity is measured as 55.1 W/m2 and the output intensity as 28.7 W/m2. Calculate the attenuation of the
  75. 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
  76. 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
  77. Physics

    This is for physics class. Sally applies 32 N of force at an angle of 22 degrees above the horizontal to a 12 kg crate. Ignoring friction, calculate the horizontal acceleration of the crate? Conceptual: will the acceleration of the crate increase or
  78. pHYSICS

    A BALL IS THROWN STRIAGHT UPWARD AND RETURMS TO THE THROWER'S HAND AFTER 3 SECONDS IN THE AIR. A SECOND BALL IS THROWN AT AN ANGLE OF 30 DEGREES WITH THE HORIZONTAL. AT WHAT SPEED MUST THE 2ND BALL BE THROWN SO THAT IT REACHES THE SAME HIEGHT AS THE ONE
  79. 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
  80. Physics

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  81. 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
  82. 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
  83. math

    A textbook store sold a combined total of 315 physics and chemistry textbooks in a week. The number of physics textbooks sold was two times the number of chemistry textbooks sold. How many textbooks of each type were sold?
  84. Physics

    What is the total force on the bottom of a swimming pool 27.5m by 9.0m whose uniform depth is 1.9m? physics What is the absolute pressure on the bottom of a swimming pool? What will be the pressure against the side of the pool near the bottom?
  85. 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
  86. physics repost bobpursley

    The energy given off by 300 grams of an alloy as it cools through 50°C raises the temperature of 300 grams of water from 30°C to 40°C. The specific heat of the alloy (in cal/g C ) is: i know Q=CpM(delta T) but what is what? Responses * physics -
  87. 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
  88. 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
  89. Scince: Physics

    A ball is dropped from a building and falls with an acceleration of magnitude 10m/s^2. The distance between floors in the building is constant. The ball takes 0.5s to fall from the 14th to the 13th floor and 0.3s to fall from the 13th floor to the 12th.
  90. 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
  91. 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-
  92. 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-
  93. 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
  94. PHYSICS

    Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #7: A 30 kg ball is launched at an angle of 15 degrees
  95. math

    if m set of 22 mathematics teachers and p is the set of 25 physics teachers and if 2 teachers both mathematics and physics, how many elements has MUP.
  96. 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???
  97. physics

    For a class demonstration, your physics instructor pours 1.16 kg of steam at 100.0°C over 4.69 kg of ice at 0.0°C and allows the system to reach equilibrium. He is then going to measure the temperature of the system. While the system reaches equilibrium,
  98. physics

    Whats the physics behind this? 3 balls are placed at the top of an inclined beam. The beam, attached to a spinning platform, is spun manually. As the platform and beam slows down, the first ball rolls down the beam. The beam instantly speeds up, but slows
  99. Physics

    two students working on physics assignment to find out how far window is from the roof of a building drop a ball over the edge of the roof the ball takes .1 seconds to travel from the top of the window to its bottom of a distance of 1 m assume the
  100. Physics - same ? as marina but im smarter, lol

    Marina is my bf and we both attend a educational program called proyecto science. In it, when we were to attend the physics course, we had this ?: T = 2ð² L/G in this equation, T represents time, L represents Length and G represents Gravity. We are