Physics!

74,730 results, page 100
  1. physics

    A cannon is fired from a cliff 200 m high downward at an angle of 30o with respect to the horizontal. If the muzzle velocity is 34 m/s, what is its speed (in m/s) when it hits the ground?
  2. 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
  3. Physics

    A police car approaches a large wall at 51m/s. Its siren emits a 980 Hz signal. What is the frequency of the reflected sound observed by the officer?
  4. physics

    An object is placed (a) 6cm (b) 20cm from a thin convex lens of focal length 10cm. Determine the nature, position and magnification of the image in each case.
  5. 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?
  6. Physics

    A spectrometer uses a grating with 11600 lines/cm. Find the angle at which red light, 632.3 nm, has the first-order bright band. Answer in units of degrees.
  7. 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)
  8. Physics

    How do we calculate the "radius of gyration" of a 500g steel rod spinning at 300 RPM and having a lenght of 30cm? We need this to find the moment of Inertia... don't we?
  9. 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?
  10. physics

    A cannon is fired from a cliff 200 m high downward at an angle of 30o with respect to the horizontal. If the muzzle velocity is 34 m/s, what is its speed (in m/s) when it hits the ground?
  11. physics

    A cannon is fired from a cliff 200 m high downward at an angle of 30o with respect to the horizontal. If the muzzle velocity is 34 m/s, what is its speed (in m/s) when it hits the ground?
  12. Physics

    Two packing crates of masses 7.57 kg and 4.51 kg are connected by a light string that passes over a frictionless pulley as in the figure below. The 4.51 kg crate lies on a smooth incline of angle 40.0°.
  13. 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
  14. physics

    a 5cm object is placed 50cm grom a converging mirror whose focal length is 20 cm. find the position and size of the image. Draw a ray diagram.
  15. physics

    1. A bullet of mass 10 g is fired vertically upward and it reaches to the highest point in 10 seconds. Which of the following figures is nearer to its maximum height above the firing position? A) 10 m B) 22 m C) 30 m D) 42 m E) None of the above
  16. 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.
  17. 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
  18. physics

    The football is kicked over the goalpost with an initial velocity of vA=32 m/s as shown. Determine the point B (x,y) where it strikes the bleachers. type this question to google to find the figure. please and thank you.
  19. Physics

    Two packing crates of masses m1 = 10.0 kg and m2 = 3.20 kg are connected by a light string that passes over a frictionless pulley as in the figure. The 3.20-kg crate lies on a smooth incline of angle 44.0°.
  20. physics

    The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the total force on a(n) 75 kg driver by the dragster he operates as it accelerates horizontally along a straight line from rest to 66 m/s in 4.5 s? Answer in units of kN
  21. 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?
  22. 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?
  23. Physics urgent pleasw

    Stone is thrown vertically downward with an inital speed of 2.0m/s from height of 10m, determine time it takes to reach the bottom. Thanks!
  24. Physics

    An engine of car of power 40KW moves on a rough road wit a velocity of 50ms-1.cal.the force require to bring it to rest.
  25. 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
  26. 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.
  27. Physics

    How far will a motorcycle driven by Emily travel, if it is initially moving at 14.8 ft/s and accelerates uniformly at 11.3 ft/s2 for 6.6 seconds? My teacher never gave us equations to use when solving this king of problem.
  28. 12th grade.physics

    three equal and similar charges each of 'q' units are placed at the corners of the square of side 'a' .find the electric field strength at the fourth corner?
  29. physics

    If the angular quantities θ,ω,α were specified in terms of degrees rather than radians, how would the kinematics equations for uniformly accelerated rotational motion have to be altered?
  30. physics

    A beautiful man with a large nose named Melvin lifts a 28.1 kg bucket from a well anddoes 4.24 kJ of work. The acceleration of gravity is 9.8 m/s2 . How deep is the well? Answer in units of m
  31. 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
  32. 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?
  33. 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?
  34. physics

    A cannon is fired from a cliff 200 m high downward at an angle of 30o with respect to the horizontal. If the muzzle velocity is 34 m/s, what is its speed (in m/s) when it hits the ground?
  35. 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.
  36. 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
  37. 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 ?
  38. Physics

    A rocket moves upward, starting from rest with an acceleration of 28.3 m/s2 for 5.50 s. It runs out of fuel at the end of the 5.50 s, but does not stop. How high does it rise above the ground? Answer in units of m
  39. 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?
  40. physics

    A drag racer starts her car from rest and accelerates at 9.0 m/s2for the entire distance of 105.0 m. What is its speed at the end of the run? Answer in units of m/s.
  41. 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.
  42. 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.
  43. Physics

    v(y)=v with letter y below normal line. "Explain why you can use the formula v(y)=g(t/2) to calculate the initial vertical velocity." My teacher claimed he explained the answer to this, but I didn't catch it. I would appreciate any help I get. THANKS!!!
  44. physics

    The feature that our eyes are most sensitive to seeing is which of the following? A) edges or boundaries.B) images that fall on the blind spot.C) gray areas.D) anything at the periphery.E) all light of moderate intensity.
  45. Physics

    A spiral spring 20cm long is stretched to 25cm by a load of 50N.What will be its length when streched by 100N assumimg that the elastic limit is not reached?
  46. 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
  47. 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.
  48. physics

    The forces in the figure below are acting on a 2.1 kg object. Find the values of ax and ay, the x and y components of the acceleration. i.imgur. com/nNz9m. png this is one of the last problems on my homework that i just do not understand.. can someone
  49. physics

    an object of mass 10kg moves in a circle of radius 13m of uniform speed of 43m\s a) calculate the angular velocity b) the centripetal force
  50. 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°.
  51. 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.
  52. Physics

    Sherlock Holmes examines a clue by holding his magnifying glass (with a focal length of 26.5 cm) 15.1 cm away from an object. Find the image distance. Answer in units of cm
  53. Uni Physics

    A skier travelling at 13 m s-1 reaches the foot of a steady upward 14° incline and glides 18 m along this slope before coming to rest. What was the average coefficient of friction?
  54. 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.
  55. physics

    i need help in solving this problem, please help. Four identical charges (+3.0 ìC each) are brought from infinity and fixed to a straight line. Each charge is 0.47 m from the next. Determine the electric potential energy of this group.
  56. Physics (I have a test tomorrow)

    What power is required to accelerates a 1980kg car from 30km/h to 70km/h against a constant force of resistance of 750N over a distance of 85m. Thank you for your help!
  57. physics

    a uniform rectangular marble slab is 3.4m long and 2.0 m wide with a mass of 180kg. it is lyning on flat ground how much work is needed to stand it on end
  58. 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
  59. 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
  60. 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
  61. physics

    Light falls on a photoelectric surface that has a work function of 2.90 eV. If the voltage required to stop the ejected electrons is 0.210 V, what is the wavelength of the incident radiation?
  62. Physics

    What is the resistance of a 4.00 m length of copper wire having a diameter of 2.00 mm at a temperature of 20 degrees? R= ? L= 4.00 m resistivity= 1.72 * 10^-8 ohm-meters A= ? A= pi*r^2 change 2 mm to .002m, square it and multiply by 3.14 I got .00001256 Is
  63. 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?
  64. physics

    An object is projected upward from the surface of the earth with an initial speed of 2 km/s. The acceleration of gravity is 9.81 m/s^2. Find the maximum height it reaches. Answer in units of km.
  65. AP physics

    Galileo carried out his seminal free-fall experiment using and incline plane. Why is such and approach feasible,and sometimes preferable to the simple drop meathod, for determining g?
  66. Physics

    Suppose a circular platform is rotating at a constant rate of 24 rev/min. How far away from the centre would one need to stand in order to have an radial acceleration of 9.9 m/s2? Express your answer in cm.
  67. 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
  68. Physics

    How much torque is required to accelerate a uniform sphere of mass 10,000.0 kg and radius 2.5 meters from rest to an angular velocity of 60 rpm in a time of 90 seconds?
  69. Physics

    find the electrostatic potential, and then the electric field a distance z above the centre of a circular loop of radius r, which carries a uniform line charge (lamda)
  70. 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
  71. 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.
  72. 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.
  73. physics

    How much friction force will be required if a car weighing 2100kg traveling at 28m/s rounds a curve of radius 59m banked at a 15 degree angle
  74. physics

    Find the horizontal and vertical components of the d = 140 m displacement of a superhero who flies from the top of a tall building following the path shown in Fig. P3.18 where θ = 28.0°.
  75. Physics

    German silver wire has a cross-sectional area of 2.047 x 10^-3 cm^2. How many meters are needed to make a resistance of 100 (omega)? I don't know where to begin.
  76. physics

    A ball is thrown upward.What is its maximum height? Its initial vertical speed is 11.5 m/s and the acceleration of gravity is 9.8 m/s2 . Neglect air resistance. Answer in units of m
  77. physics

    A hockey puck sliding on a frozen lake comes to rest after traveling 265 m. If its initial velocity is 4.2 m/s, what is its acceleration (assumed constant)? Answer in units of m/s2.
  78. physics

    The energy released by a heater which draws a current of 5A at 220V for 1min. E ~ V × I× t( hrs)÷1000 220×5×0.0167÷60000 Is equal to 0.00030 Kwh
  79. 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.
  80. 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..
  81. Physics

    Calculate the magnitude of the linear momen- tum for each of the following cases a) a proton with mass 1.67 × 10−27 kg mov- ing with a velocity of 6 × 106 m/s. Answer in units of kg · m/s.
  82. physics

    A stone of mass 0.7kg is projected vertically upward with a speed of 5m/s.calculate the maximum height reached. [Take g=10m/s^2 and neglect air resistance]. "
  83. physics

    A 22.1 kg child descends a slide 3.4 m high and reaches the bottom with a speed of 2.4 m/s. How much thermal energy due to friction was generated in this process? I'm sure where to even start this problem
  84. physics

    Taking R = 1.00 k Ω and ∑ 250 V in Figure P28.25, determine the direction and magnitude of the current in the horizontal wire between a and e. google this to find picture
  85. Physics

    an earth satellite has an elliptical orbit with an eccentricity value, e=0.40 and on orbital period of 10 hours and 54.0 minutes. Find the height above the surface at its closest approach point.
  86. Physics

    a ball is released from rest and rolls down in an inclined plane, requiring 4 sec. to cover a certain distance of 100m. a) what is the acceleration? b) how many cm would it have fallen vertically in the same time?
  87. Physics

    An object is placed on a frictionless inclined plane, and will accelerate at a constant rate. Determine the amount of acceleration due to gravity both parallel and perpendicular to the incline.
  88. 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?
  89. Physics

    I have a test tomorrow and I don't really understand this question, I was hoping somebody could help explain it? If 2.75x10¹⁹ electrons pass a point in a circuit in 30s, what is the current?
  90. Physics

    From top of a tower 160 m high a body is projected upwards with a velocity of 40 m/s making an angle of 30° with the horizontal. Find the time it will take to reach the ground
  91. College Physics

    A student throws a 140 g snowball at 7.5 m/s at the side of the schoolhouse, where it hits and sticks. What is the magnitude of the average force on the wall if the duration of the collision is 0.19 s ?
  92. physics

    Suppose David Ortiz hits a home run which travels 361. feet (110. m). Assuming it left the bat at 50.°, how fast was it hit?
  93. physics asap

    A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is? On this question I asked my teacher I am suppose to get 2000 N and I don't get how to get it.
  94. physics

    A car travels around an unbanked highway curve (radius 0.15 km) at a constant speed of 25 m/s. What is the magnitude of the resultant force acting on the driver, who weighs 0.8kN?
  95. AP Physics B

    If the system shown in Figure P8.29 is set in rotation about each of the axes mentioned in problem 29, find the torque that will produce an angular acceleration on 1.5 rad/s2 in each case.
  96. 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?
  97. 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.
  98. Physics

    An all-terrain vehicle of 4000 kg mass moves up a 13o slope at a constant velocity of 6.00 m/s. The rate of change of gravitational potential energy with time is
  99. 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.
  100. 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