physics please HELP !

130,869 results, page 63

  1. Physics

    A police car is traveling at a velocity of 20.0 m/s due north, when a car zooms by at a constant velocity of 44.0 m/s due north. After a reaction time 0.700 s the policeman begins to pursue the speeder with an acceleration of 6.00 m/s^2. Including the reaction time, how long ...
  2. Physics or Math (Please Help!)

    The top of the pool table is 2.80 ft from the floor. The placement of the tape is such that 0 feet aligns to the edge of the table (as shown). The winner of the competition wants to know if he has broken the world record for the break shot of 32 mph. His ball landed a distance...
  3. Physics... Please Help

    An arrow is fired with a speed of 20.0 m/s at a block of Styrofoam resting on a smooth surface. The arrow penetrates a certain distance into the block before coming to rest relative to it. During this process the arrow's deceleration has a magnitude of 1300 m/s2 and the block'...
  4. Physics

    Hunting a black hole. Observations of the light from a certain star indicate that it is part of a binary (two-star) system. This visible star has orbital speed v = 270 km/s, orbital period T = 1.6 days, and approximate mass m1 = 6.0Ms, where Ms is the Sun's mass, 1.99 x 1030 ...
  5. Physics

    I need help with this question please. A solid cylinder of mass m and radius R has a string wound around it. A person holding the string pulls it vertically upward such that the cylinder is suspended in midair for a brief time interval (change in)t and its center of mass does ...
  6. science

    Helium has the lowest boiling point of the elements. The slightest change in temp can cause it to vaporize and expand. To prevent pressure explosions, a line from the tank has a "burst disk" in case a of sudden pressure increse. then the diaphragm would rupture and release the...
  7. Linear Equations

    Can you please help solve this equation using the substitution method? I have tried and keep getting that X and Y = 7/2, but the answer in the book states no solution, inconsistent system. What am I doing wrong? Please help! Solve the systems of equations by the substitution ...
  8. Chemistry

    Compare two reactions, one requiring the simultaneous collision of three molecules and the other requiring a collision between two molecules. From the standpoint of statistics, which reaction should be faster? Can someone please help&explain this please?
  9. calculus repost, please assist pleassssssse

    Hi Trying to work with confusing Taylor series....any assistance would be much appreciated!! How can I use T(x)=5-9((x-2)^2)-3((x-2)^3) to approximate the f(0) ???? I realize that Taylor series f(x)=f(a)+f'(a)(x-a)+f''(a)((x-a)^2)etc... but the above T(x) is centered at x=2, ...
  10. Ap calc.. Dying!! Please help!

    Given the curve x^2-xy+y^2=9 A) write a general expression for the slope of the curve. B) find the coordinates of the points on the curve where the tangents are vertical C) at the point (0,3) find the rate of change in the slope of the curve with respect to x I don't even know...
  11. Math - Precision and Significant Digits

    Please help me with the following: Find each product or quotient. Use significant digits. 0.0505m x 665m A. 33.6 m^2 B. 33.58 m^2 C. 33.50 m^2 D. 3.582 m^2 I think the answer is A. Is this correct? Please help me by checking my answer. Any help will be appreciated!! :) P.S.: ...
  12. Math

    Use the graph below to answer the following question. I'll post the link to the graph below. Find the slope. A. 2 B. -1/2 C. -2 D. 1/2 Honestly I'm horrible at Math so I can't really pick a answer can someone please help me? Please explain to me how to work this problem.
  13. @ABC

    Stop posting more questions until you have gone back and followed the directions on the Post a New Question page: Please show your work. Tutors will not do your homework for you. Please show your work for any question that you are posting.
  14. Math

    1. Write a ratio and a percent for the shaded area. A. 6/25, 30% B. 3/50, 6% C. 6/25, 24% D. 3/10, 30% 2. Model 24% on a 5 x 5 grid. Cant do the answers, but if you did it please tell me! 3. Write a ratio as a percent In the seventh grade class, 19/25 students voted in favor ...
  15. help please?!(:

    Rico's collection of quaters and dimes contains $32.85. There are 171 coins in all How many quarters and how many dimes are in Rico's collection? i solve these with 2 equation. would they be: q + d = 171 25q + 10d = 32.85 help me please.
  16. chemistry /help please

    can someone please help me balance this equation?: potassium permanganate reacts with iron(II)sulfate and sulfuric acid to produce iron(II)sulfate and manganese(II)sulfate and potassium sulfate and water
  17. Chemistry

    Equation: 3CaCl2 (aq) + 2 Na3PO4 (aq) → Ca3(PO4)2 (s) + 6 NaCl (aq) How many grams of Ca3(PO4)2 are formed when 450.0 g NaCl are formed in the reaction? please show steps, please
  18. AP Calculus

    Are infinite discontinuities removable? Also, please help me with this question: f(x)=x^2+4x+3 / x^2-9 has one removable discontinuity and one vertical asymptote. Find and identify the x-value for each. I found the asymptote at x=3, but please help for the discontinuity. Thanks!
  19. Chemistry

    Please tell me how many bonds are in cucl2.4h2o and in CuSO4.5h20 and how cu+2 forms bonds in orbitals 4s,3d with cl2,so4. also please tell me 4h2o and 5h2o attachment in orbitals.
  20. Science please answer?

    what is the wavelength and frequency if the wavelengthis4.5x10-7 Show wok please (-7) You have already stated the frequency. Are you talking about light? What are the units of wavelength? meters? cm? feet/ frequency = (wave speed)/(wavelength) You can do the numbers. Make sure...
  21. English

    Which is the pronoun case and why 19a. Please send an invitation to Bob and she. 19b. Please send an invitation to Bob and her.
  22. PLEASE HELP ASAP ALGEBRA

    indentify the sequence as arithmetic, geometric, or neither. 3,4.5,6,7.5,... a. arithmetic b. geometric c. neither please help i don't know the answer
  23. Physics Urgent!!!!!

    OK, I know, I'm postin this way too many times but I'm halfway there now.... Newton’s Law of Gravity specifies the magnitude of the interaction force between two point masses, m1 and m2, separated by the distance r as F(r) = Gm1m2/r^2. The gravitational constant G can be ...
  24. Physics Urgent!!!!!

    OK, I know, I'm postin this way too many times but I'm halfway there now.... Newton’s Law of Gravity specifies the magnitude of the interaction force between two point masses, m1 and m2, separated by the distance r as F(r) = Gm1m2/r^2. The gravitational constant G can be ...
  25. MATH HELP PLEASE & THNX!

    Hercules Films is deciding on the price of the video release of its film Bride of the Son of Frankenstein. Marketing estimates that at a price of p dollars, it can sell q = 300,000 − 15,000p copies, but each copy costs $4 to make. What price will give the greatest profit...
  26. Physics

    A barbell is mounted on a nearly frictionless axle through its center. The low-mass rod has a length d = 0.27 m, and each ball has a mass m = 0.2 kg. At this instant, there are two forces of equal magnitude F applied to the system as shown in the figure, with the directions ...
  27. physics please help!!

    Two acrobats, each of 78.0 kg, launch themselves together from a swing, holding hands. Their velocity at launch was 6.80 m/s and the angle of their initial velocity relative to the horizontal was 28.0 degrees upwards. At the top of their trajectory, their act calls for them to...
  28. Physics

    In moving a 35.0 kg desk from one side of a classroom to the other, a professor finds that a horizontal force of 300 N is necessary to set the desk in motion, and a force of 185 N is necessary to keep it in motion at a constant speed. (a) What is the coefficient of static ...
  29. physics

    A 0.57 kg block oscillates back and forth along a straight line on a frictionless horizontal surface. Its displacement from the origin is given by x = (13 cm)cos[(20 rad/s)t + π/2 rad] (a) What is the oscillation frequency (in Hz)? (b) What is the maximum speed acquired ...
  30. Physics help please!

    Light waves with two different wavelengths, 632 nm and 474 nm, pass simultaneously through a single slit whose width is 7.63 x 10-5 m and strike a screen 1.30 m from the slit. Two diffraction patterns are formed on the screen. What is the distance (in cm) between the common ...
  31. Live Help

    This may not be homework...but how do I go about using the live help for this site? At this point, live help is not available. Computer glitches, you know. So keep posting your questions on the message boards. Especially in the afternoons and evenings, there are usually ...
  32. PROJECTILE MOTION

    A ball is thrown horizontally from the top of a cliff 50m high with a velocity of 7m/s. How far from the base of the building does the ball land. This is what I think is how you do the question(Please correct me if I am wrong). y=vt+.5a(t)² 50=0+.5(9.8)t² 10.204=t² t=3.194 ...
  33. Calculus Please Help

    I think I have the right answer, but I am not 100% sure how to do the values at (1,-1) and the one below at (0,-1, 1). Please explain how I need to approach how to do these. Thank You! Calculate the partial derivative @f/@x, @f/@y and @f/@x | (1,-1), and @f/@y | (1,-1) f(x,y...
  34. algebra

    For the quadratic function f(x) = - x^2 +2x + 6, find the vertex and the axis of symmetry, and graph the function. Again, I need help with this as these are practice examples for an upcoming quiz and I stink at this part of algebra and I need to get it otherwise I won't ...
  35. SCIENCE-BONES-NEED HELP

    Do all bones contain bone marrow? (Im specifically talking about the hand bone) Please give me any information on bones, joints, muscles, ligaments, tendons, cartilage, and changes of the hand. I have some, but I want more info. Please help me! Thanks!
  36. Physics

    Two trains face each other on adjacent tracks. They are initially at rest, and their front ends are 30 m apart. The train on the left accelerates rightward at 1.17 m/s^2. The train on the right accelerates leftward at 1.1 m/s^2. (a) How far does the train on the left travel ...
  37. Math: Calculus - Geometric Vectors

    Find the magnitude and the direction of the resultant of each of the following systems of forces using geometric vectors. a) Forces of 3 N and 8 N acting at an angle of 60 degrees to each other. Please help me with this question. I don't understand the wording, so I don't know...
  38. Math

    I need some help please. I don't understand the math that we are doing. Please explains to me in detail how to do radical expressions and like how to simplify them and stuff. I don't get it and it would be much appreciated. here is one of the problems. Also my computer does ...
  39. chemsitry

    hi I need help with this question please. 1. consider the decomposition of N2O5 in carbon tetrachloride(ccl4) at 45c 2N2O5(soln)-> 4NO2(g)+ O2(g) The reacion is first order in N2O5, with the specific rate constant 6.08*10^-4 per second.calculate the reaction rate under ...
  40. Chem--PLEASE HELP 911

    A compound of carbon, hydrogen, and oxygen was burned in oxygen, and 2.00 g of the compound produced 2.868 g CO2 and 1.567 g H2O. In another experiment 0.1107g of the compound was dissolved in 25.0 g of water. This solution had a freezing point of -0.0894 degrees C. What is ...
  41. calculus

    Iamhaving a really hard time trying to understand this question. Can someone please show me how to work this question. Give the following polynomial, find a. the zeros and the multiplicity of each b. where the graph crosses or touches the x-axis c. number of turning points d. ...
  42. Math--Please Help

    A pizza bx with a square base is to be made from a rectangular sheet of cardboard by cutting six 1-inch square from the corners and the middle sections and folding up the sides. If the area of the base is to be 144 in^2, what size piece of cardboard should be used? Please ...
  43. English grammar

    Please help me to arrange correct grammar below: Nov. 18,2015 Please be informed that starting on Nov.23, 2015 Due to high consumptiom for the electric bills The internet usage charge will be P15.00 per hour and there will be no more promo for P25.00 2 hours. Thank you for ...
  44. Please help quick!!!!! History

    Name and describe three facets of modern business that have their origins in trade practices during the Middle Ages? I have looked at my book over and over again and i can not find anything. can some one just please name them that is all i need!
  45. @ Online Students

    I just banned another "student" for cheating and rudeness. Please heed this student's lament. "quick backstory; i've been cheating on all of my work except portfolios this whole year cause i'm in online school. but i'm wanting to learn since there's gonna be ACT test in REAL ...
  46. Elasticity (Physics)

    A tunnel of length L=150m, height H=7.2m, and width w=5.8m (with a flat roof) is to be constructed at a distance d=60m beneath the ground. The tunnel roof is be entirely supported by square steel columns, each with a cross sectional area of 960 cm^2. The mass of 1.0 cm^3 of ...
  47. Physics 1

    Three charges are fixed to an xy coordinate system. A charge of +16C is on the y axis at y = +3.1 m. A charge of -16C is at the origin. Lastly, a charge of +55C is on the x axis at x = +3.1 m. Determine (a) the magnitude and (b) direction of the net electrostatic force on the ...
  48. physics homework

    can you please check my answers? 10. when rewinding a an audio tape or vdieotape, one reel winds fastest at the end. which reel is this? why does it speed up? -The reel is the left and it speeds up because of its greater rotational intertia is near the rim. 15.the wheels of ...
  49. physics

    The width of the doorway is 83 cm, and the speed of sound is 343 m/s. Find the diffraction angle when the frequency is each of the following. (a) 4.8 kHz If theta is the diffraction angle. Sine(theta)= lambda/slit width where lambda = wave length so you need to find the ...
  50. Statistics (elementary probability theory)

    In an examination 60 candidates offer maths, 80 offer english,and 50 offer physics, if 20 offer maths & english, 15 offer english & physics, 25 offer math & physics and 10 offer all the 3. How many students entered to the examination ?
  51. Physics

    A pilot must fly his plane to a town which is 200km from his starting point in a direction 30degrees N of E. He must make the trip in 1/2 h. An 80km/h wind blows in a direction 30degrees E of S. Find the speed of the plane relative to air. I found the speed of the plane ...
  52. Physics or Math (Please Help!)

    The top of the pool table is 3.05 ft from the floor. The placement of the tape is such that 0 feet aligns to the edge of the table (as shown). The winner of the competition wants to know if he has broken the world record for the break shot of 32 mph. His ball landed a distance...
  53. Physics please answer the a) for me :(

    Ill do the rest. A ball was thrown up at 25.0 m/s. It was released when it was 2.0 m above the ground. a) For how long did the ball rise? b) at the top of its trajectory, how far above the ground was it? c) what was the ball's speed, direction and height 2.0 s after release? d...
  54. Physics Urgent!!!!! I really need help with this

    Sorry to repost this, again, but I still don't understand. Newton’s Law of Gravity specifies the magnitude of the interaction force between two point masses, m1 and m2, separated by the distance r as F(r) = Gm1m2/r^2. The gravitational constant G can be determined by ...
  55. please check

    the meaning of HUMDRUM is a) morose c) exciting b) ordinary d) disruptive my answer: b) ordinary INTERMINABLE most nearly means a) brief c) internal b) fruitful d) endless my answer: d) endless TRIVIAL is best defined as a) minor c) weighty b) important d)extended my answer: a...
  56. physics

    A box is resting on a table frictionless). Determine the weight of the box and the normal force acting on it. (a) If the box was pushed down, with a force of 40N, determine again the normal force acting on the box. (b) If the box was pulled up with a force of 40N, what now is ...
  57. Physics

    I am having a problem answering a physics question: A plane is heading due south and climbing at the rate of 60 km/hr. If its airspeed is 540 km/hr and there is a wind blowing 110 km/hr to the northwest, what is the ground speed of the plane?
  58. college physics

    A student of mass 64.7 kg climbs up the stairs in the Physics Department, with a vertical height change 3.1 metres. What is the change in gravitational potential energy? Give your answer in Joules, to 2 significant figures.
  59. physics

    Daneil is bouncing on a trampoline. After a certain bounce he leaves the ground traveling at a speed of 2.54 m/s. How far into the air does he go? I need helllpppp I'm so bad a physics, I need to know what formula to use..
  60. Math

    Dear Readers, I am a 6th grader that recently took a math test. I got a question wrong, and I think it was because I don't know the definition to the question. Can you please tell me what an interval in mathematical terms is. Please give me something a 6th grader can ...
  61. reading

    Please dont remove this question, this is actually a question i have to do for an essay so please help me. What is your opinion about youtube and its community? How does this affect us a society? I just need help with your opinion or ideas to answer and write my essay. Also ...
  62. Physics...help please!

    Unlike a ship, an airplane does not use its rudder to turn. It turns by banking its wings: The lift force , perpendicular to the wings, has horizontal component, which provides the centripetal acceleration for the turn, and a vertical component, which supports the plane’s ...
  63. Physics Hw Help Please

    The Burj Khalifa in Dubai is the world\'s tallest building. The structure is 828 m (2,716.5 feet) and has more than 160 stories. A tourist is obviously using the elevator to reach their hotel room and after a long ride finally arrives at the correct floor where the tourist has...
  64. Physics

    Please help me, I am in dire need of it, A football quarterback shows off his skill by throwing a pass {5.70 m downfield and into a bucket. The quarterback consis- tently launches the ball at 38.00' above horizontal, and the bucket is placed at the same level from which the ...
  65. Math

    Find the five-number summary of the following set of numbers. 337, 248, 157, 388, 248, 451, 271, 225, 310 First sort... 157,225,248,271,310,337,388,451. the minimum = 157 the minimum = =271 the median = (271+310)/2= 290.5 the upper quartile= can you please tell me if this ...
  66. Calculus please help!

    Suppose you have a set of data points for x and t. Using the below formula you need to graph a STRAIGHT LINE. x = 1/2 a t^2 Now, I know I would graph x versus t, but do I graph: -x versus t -x versus the root of t -x versus t^2 -or possibly x^2 versus t??? Soo confusing! ...
  67. Physics please help?????

    A 540 g block is released from rest at height h0 above a vertical spring with spring constant k = 320 N/m and negligible mass. The block sticks to the spring and momentarily stops after compressing the spring 19.8 cm. How much work is done (a) by the block on the spring and (b...
  68. Physics

    an iron of diameter 4 cm at 25 degree and a cylinder of diameter 4.002 cm is made of the same material at the same temperature. to what temperature the ring should be heated so that the cylinder passes through the ring easily.? a) 41.6 degree Celsius b) 66.6 degree Celsius c) ...
  69. Open Invitation

    Please post some questions on foreign language/ESL as that area is my speciality. It's discouraging for me to see so few questions for my area! I would especially love to see questions re: Spanish, French, Japanese and literature. I am in French two. I am going to france this ...
  70. English

    1. May I take your order? 2. Would you like to order now? 3. Will you order? 4. Order, please. 5. Please order your food. 6. Are you ready to order? 7. Do you want to order? 8. Why don't you order? 9. How about ordering? 10. What do you think of ordering? (In a restaurant, can...
  71. maths

    $100 for 100 animals One camel costs $5 and 10 sheep costs $1 and one horse costs $2 i know it hard Steve and if I didn't get the answer something big is gonna happen to me please do Me a favour Can any one help soon please
  72. Physics - Relative velocity

    A barge is heading directly across a river at35km/h while you are walking on the barge at 4km/h in the same direction as the barge is heading. The current is flowing downstream at 1.4km/h. a) What is your velocity relative to the shore? (7.6km/h) b) What would you velocity be ...
  73. Physics

    A spacecraft approaching the earth launches an exploration vehicle. After the launch, an observer on earth sees the spacecraft approaching at a speed of 0.74c and the exploration vehicle approaching at a speed of 0.98c. What is the speed of the exploration vehicle relative to ...
  74. Physical Science

    In which of these processes is an element of matter changes into a completely different element.....nuclear fusion, nuclear fission, neither, or both? Please note that we don't do students' homework for them. Once YOU have attempted to come up with a response to each of YOUR ...
  75. AED 200

    Identify the roles district, state, and federal government agencies have in your local schools. Which agency do you feel has the most significant influence in making policy and curriculum decisions at the local level? Why? Please help. I can not find any websites that have ...
  76. Algebra (Graphing Functions)

    Consider the following function. f(x) = −3x if x < −2 x2 if −2 ≤ x < 2 −3 if x ≥ 2 Please help me find the intervals on which f is increasing, is decreasing, or is constant(in interval notation). As well as the x and y intercepts for ...
  77. Science

    Please complete the formula and process in arriving the answer. Please. Thank you. Nathaniel is driving his sports car down a four lane highway at 40m/s. He comes up behind a slow moving dumptruck and decides to pass it in the left hand lane. If Nathaniel can accelerate at 5m/...
  78. HTT / 230 please help

    i need help i can not understand this Question i don't know where to find the answer i have been looking for hours please some one help me ! Question is my is in hospitality finances class Explain why depreciation expense should be added back when compiling the statement of ...
  79. science

    Please help me with these questions I have looked all threw my book but i cant find them. 7. Why are we not sure about the interior of the earth? Do we know for sure why? 12. Some volcanoes are more explosive than others? What makes this diffrence in explosivity occur? 14.What...
  80. Calculus

    Please help me with the following 2 questions. 1. Find the area of the curved surface of a right-circular cone of radius 6 and height 4 by rotating the straight line segment from (0,0) to (6,4) about the y-axis. 2. Use the Maclaurin polynomial of degree 4 to approximate sin(0....
  81. CALCULUS PLEASE HELP!!!

    SHOW WORK PLEASE!!! The displacement (in centimeters) of a particle moving back and forth along a straight line is given by the equation of motion s = 2 sin πt + 3 cos πt, where t is measured in seconds. (Round your answers to two decimal places.) (a) Find the ...
  82. Science please help thx

    Convection cells are created by very hot material deep in the mantle rising, then cooling, sinking again and repeating the cycle. This process occurs because of the uneven distribution of ? Within the earth? Please fill in the question mark with a answer. a. Crystal plates B. ...
  83. history

    was the anti-immigrant hysteria following world war one simply a continuation of this feeling or was it more a reaction to the wave of immigrants that entered the us in the late nineteenth century---im writing a paper on this, please help A continuation of what feeling? Please...
  84. ap history

    please help with this DBQ to what extent it is justified to characterize the industrial leaders of the 1865-1900 era as either robber barons or industrial states-man? ive looked at the internet but not much about industrial statesman. what do you think? PLEASE HELP!!! THANK ...
  85. physics

    The pole vault landing pad at an Olympic competition contains what is essentially a bag of air that compresses from its "resting" height of 1.1 m down to 0.1 m as the vaulter is slowed to a stop. (a) What is the time interval during which a vaulter who has just cleared a ...
  86. physics

    A uniform rod of mass M = 0.245kg and length L = 0.49m stands vertically on a horizontal table. It is released from rest to fall. (a) Calculate the angular speed of the rod, the vertical acceleration of the moving end of the rod, and the normal force exerted by the table on ...
  87. classroom management

    I need to find the meaning of the ff: terms...please help... Aspects of Classroom Teaching: 1. Approaches a. assertive b. behavior modification c. group guidance d. business academic e. group management 2. Classroom Management and Discipline please help me...thanks in a ...
  88. Chemistry

    Please help the question that I got is: Calculate how much 95% ethyl alcohol will be required to dissolve 075g sulfanilamide at 78 degree Celsius. Knowing that solubility of sulfanilamide is 210 mg/ml at 78 degree Celsius, 14mg/ml at 0 Degree Celsius. please explain.
  89. Science - Start of Physics

    Please help me with the following problem. Given below is the position-time graph representing motions of two runners, Nick and Ian. Use this graph to determine which runner has greater average velocity. I can't put the graph here, so the following should give you guys a ...
  90. physics

    A man holds a 185-N ball in his hand, with the forearm horizontal (see the figure). He can support the ball in this position because of the flexor muscle force , which is applied perpendicular to the forearm. The forearm weighs 24.3 N and has a center of gravity as indicated. ...
  91. Physics

    A hockey player is standing on his skates on a frozen pond when an opposing player, moving with a uniform speed of 2.0 m/s, skates by with the puck. After 1.00 s, the first player makes up his mind to chase his opponent. If he accelerates uniformly at 0.20 m/s2, determine each...
  92. science

    scientists often use models to study the movement of earth and it's moon. Why do they use models to study the movements? please help pretty pretty please with cherry on top!
  93. PLEASE HELP (MATH)

    Six quarts of a 20% solution of alcohol in water are mixed with 4 quarts of a 60% solution of alcohol in water. The alcoholic strength of the mixture is. A. 80% B. 50% C. 36% D. None I HAVE NO IDEA HOW TO DO IT PLEASE HELP
  94. Math

    Eric has a riddle: "I am thinking of a fraction that is equivalent to 2 5 25 and the numerator is 18 less than the denominator." What is Eric's fraction?Explain how you know Please tell me the answer or my grade is a 50 please tell me the answer
  95. physics

    Two boats start together and race across a 42 km wide lake and back. Boat A goes across at 42 km/h and returns at 42 km/h. Boat B goes across at 21 km/h, and its crew, realizing how far behind it is getting, returns at 63 km/h. Turnaround times are negligible, and the boat ...
  96. physics

    I am not sure how to setup this problem. I posted it earlier and "BOB PURSELY" responded we are happy to critique your thinking. I have know idea how to solve this problem or even where to start. Please help!!! A tetherball leans against the smooth, frictionless post to which ...
  97. Physics

    I am not sure how to setup this problem. I posted it earlier and "BOB PURSELY" responded we are happy to critique your thinking. I have know idea how to solve this problem or even where to start. Please help!!! A tetherball leans against the smooth, frictionless post to which ...
  98. physics

    If you rub a piece of PVC pipe with some wool and touch the PVC to Aluminum foil. Will the PVC be charged after rubbing it with wool?? Will the aluminum be charged? Finally can the PVC cause the aluminum to move. Please explain (hint: can the PVC give charge to the aluminum?) ...
  99. Physics Important please

    An insulating sphere of mass m and positive charge q is attached to a spring with length h and spring constant k_s and is at equilibrium. An infinitely long wire with positive linear charge density lamda is placed a distance l away from the charged mass at equilibrium as shown...
  100. Physics

    A 1.0 e 3 kg elevator carries a maximum load of 800.0 kg. A constant frictional force of 4.0 e 3 N retards the elevator's motion upward. Waht minum power in kilowatts, must the motor deliver to lift the fully loaded elevator at a constant force of 3.00 m/s? I have no idea how ...
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  70. 69
  71. 70
  72. 71
  73. 72
  74. 73
  75. 74
  76. 75
  77. 76
  78. 77
  79. 78
  80. 79
  81. 80
  82. 81
  83. 82
  84. 83
  85. 84
  86. 85
  87. 86
  88. 87
  89. 88
  90. 89
  91. 90
  92. 91
  93. 92
  94. 93
  95. 94
  96. 95
  97. 96
  98. 97
  99. 98
  100. 99
  101. 100