Most popular questions, page 2
  1. physic

    use draw a force diagram of a crash - test dummy in a car at the moment of collision.for this proplem, assume that the forces acting on the car are 19 600n downward, 17 800 n forward, and 25 000 n backward. the forces acting on the dummy are 585 n

    asked by nie on October 9, 2011
  2. physic

    A circus performer throws an apple toward a hoop held by a performer on a platform (see figure below). The thrower aims for the hoop and throws with a speed of 30 m/s. At the exact moment the thrower releases the apple, the other performer drops the hoop.

    asked by Dr. Neutron on February 1, 2018
  3. Physic

    A ceiling fan is rotating at 0.50 rev/s. When turned off, it slows uniformly to a stop in 11 s. (a) How many revolutions does it make in this time? (b) Using the result from part (a), find the number of revolutions the fan must make for its speed to

    asked by Anonymous on November 1, 2014
  4. physic

    A spring (80 {\rm N/m}) has an equilibrium length of 1.00 {\rm m}. The spring is compressed to a length of 0.50 {\rm m} and a mass of 2.1 {\rm kg} is placed at its free end on a frictionless slope which makes an angle of 41 ^\circ with respect to the

    asked by fatiey on August 28, 2010
  5. physic

    a wooden block of density 860 kg per metre cube at zero degree celsius is floating on benzene liquid of density 900 kg per metre cube at zero degree celsius the temperature at which the block just submerge in Benzene is

    asked by ruchiket on August 30, 2017
  6. physic

    please help me im stuck. A 400 g air-track glider attached to a spring with spring constant 9.00 N/m is sitting at rest on a frictionless air track. A 600 g glider is pushed toward it from the far end of the track at a speed of 94.0 cm/s. It collides with

    asked by jordan on December 5, 2009
  7. physic

    Vector A,with a magnitude of 23 units, points in the positive x direction. Adding vector B to vector A yields a resultant vector that points in the negative x direction with a magnitude of 8 units. What are the magnitude and direction of vector B?

    asked by joy on January 25, 2018
  8. physic

    150g of ice at 0 degreecelcius is mixed with 300g of water at 50 degreecelcius.calculate the temperature of the mixture.

    asked by damilola on January 24, 2017
  9. physic

    Hi! help me please, Thank you. A spherical steel ball bearing has a diameter of 2.540 cm at 23°C. (a) What is the diameter when its temperature is raised to 94°C? cm (b) What temperature change is required to increase its volume by 0.9%? I only need help

    asked by Chan on December 1, 2009
  10. Physic

    A 2.2 m-long string is fixed at both ends and tightened until the wave speed is 50 m/s. What is the frequency of the standing wave shown in the figure? Answer in Hz. I've been working on it for a while but cant figure out...

    asked by Danny on November 7, 2009
  11. physic

    A circus performer throws an apple toward a hoop held by a performer on a platform (see figure below). The thrower aims for the hoop and throws with a speed of 28 m/s. At the exact moment the thrower releases the apple, the other performer drops the hoop.

    asked by joy on January 30, 2018
  12. physic

    Three vectors are shown in the figure below, but they are not drawn to scale. The sum of the three vectors is R = F1 + F2 + F3. If Ry = 0 and F2 = 0.2F3,find Rx in terms of F1. the angle for F1 is 30 degree

    asked by joy on January 28, 2018
  13. physic

    Bungee Jumping. A bungee jumper jumps from a tall bridge attached to a light elastic cord (bungee cord) of unstretched length L. The cord first straightens and then extends as the jumper falls. This prevents her from hitting the water! Suppose that the

    asked by Anonymous on October 20, 2013
  14. physic

    a resistor has a voltage of 6.65 V and a current of 4.45 A. it is placed in a calorimeter containing 200g of water at 24 degree Celsius. the calorimeter is aluminum (specific heat= 0.220 cal/g-Celsius), and its mass is 60g. the heat capacity of the

    asked by julie on February 26, 2013
  15. physic

    A circus performer stands on a platform and throws an apple from a height of 50 m above the ground with an initial velocity v0 as shown in the figure below. A second, blindfolded performer must catch the apple. If v0 = 21 m/s, how far from the end of the

    asked by joy on January 30, 2018
  16. physic

    Suppose a block of lead of mass 0.4kg at temperature of 95°C is dropped in 2kg of water originally at 20°C in a container. Calculate the final temprereture if no heat is lost to the container and enviroment ;(specific heat of lead is 128j/kg°C and water

    asked by stanis frank on March 27, 2017
  17. Physic

    Two point charges of magnitude +40x10^-6C and -60x10^-6C are placed 50 cm apart. What is the distance from +40x10^-6C charge along the line joining the two point charges if the resultant potential is zero

    asked by Syam on December 16, 2014
  18. physic

    A skier traveling at 38.8 m/s encounters a 27.2 degree slope. If you could ignore friction, to the nearest meter, how far up the hill does he go?

    asked by billy on March 7, 2011
  19. physic

    A 660 N cat burglar is supported by cables in the figure below. Assume the angle è of the inclined cable is 36.0°. Find vertical cable? Thank you so much for your help.

    asked by Chan on October 12, 2009
  20. physic

    an empty rubber balloon has 0.0120 kg it filled of helium. the density of helium is 0.179 kg/m^3 of and the radius of the balloon is 0.500 what is the buoyant force over the balloon

    asked by Sue on December 5, 2015
  21. Physic

    A baseball of mass m and initial speed v strikes a catcher's mitt. If the mitt moves a distance Δx as it brings the ball to rest, what is the average force it exerts on the ball? Express your answer in terms of the given quantities. Could someone help me

    asked by Phu-Cuong on October 5, 2014
  22. physic

    In a serious accident, a nuclear power plant's reactor vessel cracks, and all of the cooling water drains out. Although nuclear fission stops, radioactive decay continues to heat

    asked by joseph on May 6, 2014
  23. Physic

    A ball is thrown horizontally from a cliff at a speed of 15 m/s and strikes the ground 45 meters from the base of the cliff. How high was the cliff (rounded to the nearest meter)

    asked by Unknown on February 27, 2013
  24. physic

    unit of distance used in astronomy is the parsec (pc): 1 pc = 3.26 ly. The distance to the Earth's next-nearest star, α-Centauri, is 1.3 pc. Find the distance d to α-Centauri in light-years and in meters.

    asked by joy on January 19, 2018
  25. physic

    A 7.28-kilogram bowling ball traveling 8.50 meters per second east collides head-on with a 5.45 kilogram bowling ball traveling 10.0 meters per second west. Determine the magnitude of the total momentum of the two-ball system after the collision

    asked by natsu on December 10, 2014
  26. physic

    9. A 2.00-kg object is attached to a spring and placed on a frictionless, horizontal surface. A horizontal force of 20.0 N is required to hold the object at rest when it is pulled 0.200 m from its equilibrium position (the origin of the x axis). The object

    asked by Ika Diana on June 29, 2013
  27. physic

    Hi! need help please thank you so much. Question:(a) Calculate the absolute pressure at the bottom of a freshwater lake at a depth of 28.7 m. Assume the density of the water is 1.00 103 kg/m3 and the air above is at a pressure of 101.3 kPa. ___Pa (b) What

    asked by Chan on November 26, 2009
  28. Physic

    A inclined plane resis to aheight of 2m over adistanse of 6m calculate

    asked by Abubakir on March 26, 2019
  29. physic

    Depending on how you fall, you can break a bone easily. The severity of the break depends on how much energy the bone absorbs in the accident, and to evaluate this let us treat the bone as an ideal spring. The maximum applied force of compression that one

    asked by nada on January 20, 2014
  30. Physic

    A wheel-and-axle system shown consists of two coaxial wheels of radius r = 2 meters and R = 6 meters. The forces applied to the system as shown in the diagram are: F1 = 80 N F2 = 80 N F3 = 40 N F4 = 30 N If counterclockwise is positive, what is the net

    asked by Anonymous on November 25, 2012
  31. physic

    A 0.20 kg ice cube at 0.0° C has sufficient heat added to it to cause total melting, and the resulting water is heated to70deg.Cel. > How much heat is added? (For water Lf=334kj/kg > andLv=2257kj/kg >

    asked by kristin on July 24, 2010
  32. Physic

    The free-body diagram in the drawing shows the forces that act on a thin rod. The three forces are drawn to scale and lie in the plane of the screen. Are these forces sufficient to keep the rod in equilibrium, or are additional forces necessary f3 ' ' ' f1

    asked by Panda on May 7, 2007
  33. physic

    The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 50 m in a straight line, reaching a final speed of 79 km/h. Determine the cheetah's average acceleration during the short

    asked by Jack on September 8, 2017
  34. Physic

    A 75-W, 120-V bulb is connected in parallel with 25-W, 120-V bulb. What is the net resistance?

    asked by Allen on April 12, 2015
  35. Physic

    A box with a weight of 22N falls through the air with a wind resistance of 14N, what is the mass of the box and the acceleration of the box?

    asked by Mac on December 4, 2012
  36. physic

    On an otherwise straight stretch of road near Moffat, Colorado, the road suddenly turns. This bend in the road is a segment of a circle with radius 118 m. Drivers are cautioned to slow down to 45mph as they navigate the curve. you heed the sign and slow to

    asked by Amy on September 22, 2012
  37. physic

    An aluminum rod is 10.0 cm long and a steel rod is 80.0 cm long when both rods are at a temperature of15 degrees cel. Both rods have the same diameter. The rods are joined end-to-end to form a rod 90.0 cm long. The coefficients of linear expansion of

    asked by Paul on July 24, 2010
  38. physic

    An electronic line judge camera captures the impact of a 57.0-g tennis ball traveling at 32.8 m/s with the side line of a tennis court. The ball rebounds with a speed of 21.2 m/s and is seen to be in contact with the ground for 4.08 ms. What is the

    asked by joy on January 23, 2018
  39. Physic

    A 2.0 kg box moves back and forth on a horizontal frictionless surface between two different springs with one 32 N/cm and the other at 16 N/cm.The box is initially pressed against the stronger spring, compressing it 3.5 cm , and then is released from rest.

    asked by Corey on November 24, 2017
  40. physic

    As you look out of your dorm window, a flower pot suddenly falls past. The pot is visible for a time t, and the vertical length of your window is Lw. Take down to be the positive direction, so that downward velocities are positive and the acceleration due

    asked by koler on September 29, 2013
  41. Physic

    How much energy is required to change a 40 g ice cube from ice at -25°C to steam at 105°C? Answer in J.

    asked by Renee on April 6, 2014
  42. physic

    A spring (80 {\rm N/m}) has an equilibrium length of 1.00 {\rm m}. The spring is compressed to a length of 0.50 {\rm m} and a mass of 2.1 {\rm kg} is placed at its free end on a frictionless slope which makes an angle of 41 ^\circ with respect to the

    asked by fatiey on August 28, 2010
  43. PHYSIC

    A body accelerate uniformly from rest at 2ms-2 .calculate it,s velocity after travelling 9m

    asked by DAVID on October 17, 2018
  44. Physic

    A meter rule is balanced horizontally on a mass of 30kg hung 20cm from one end. If the position of the knife edge is 18cm from the centre of gravity of the rule. The weight of the rule will be.

    asked by Maryann on October 14, 2018
  45. physic

    A pair of students are lifting a heavy trunk on move-in day. (Figure 1) Using two ropes tied to a small ring at the center of the top of the trunk, they pull the trunk straight up at a constant velocity v⃗ . Each rope makes an angle θ with respect to

    asked by physic ----please help on October 23, 2014
  46. physic

    A projectile is fired from the origin (at y = 0s m) a shown in the figure. The initial velocity components are v 0x = 940 m/s and v 0y = 96 m/s. The projectile reaches maximum height at point P, then it falls and strikes the ground at point Q. In Fig. 3.1,

    asked by mark on February 22, 2012
  47. physic

    A student takes the elevator up to the fourth floor to see her favorite physics instructor. She stands on the floor of the elevator, which is horizontal. Both the student and the elevator are solid objects, and they both accelerate upward at 5.15 m/s2.

    asked by joy on February 7, 2018
  48. physic

    A police car is travelling in a straight line with constant speed vp.A truck travelling in the same direction with speed 3/2 vp passes the police car.The truck driver realizes that she is speeding and immediately begins to slow down at a constant rate

    asked by shaiz on February 11, 2011
  49. physic

    by how many newtons do you increase the weight of your car when you fill up your 11.5 gal gas tank with gasoline a gallon is equal to 3.788 L and the density of gasoline is 737kg/m3

    asked by paul on July 20, 2010
  50. physic

    A 2.26 kg object is subjected to three forces that give it an acceleration a= −(8m/s^2)i + (6m/s^2)j. If two of the three forces are F1 = (36.2 N)i + (18N)j and F2 = −(12N)i + (8N)j,find the third force.

    asked by joy on February 27, 2018
  51. PHYSIC


    asked by Anonymous on November 9, 2016
  52. Physic

    What determines whether an object is a net emitter or a net absorber of radiant energy? Wood is a better insulator than glass. Yet fiberglass is commonly used as an insulator in wooden buildings. Explain.

    asked by Paige on January 30, 2008
  53. Physic

    You are moving into an apartment and take the elevator to the 6th floor. Suppose your weight is 640 N and that of your belongings is 940 N. (a) Determine the work done by the elevator in lifting you and your belongings up to the 6th floor (15.2 m) at a

    asked by Lena on March 5, 2015
  54. Physic

    a charge of 1.0x10^-6 uC is located inside a sphere. What is the flux through the sphere?

    asked by Belina on February 2, 2014
  55. physic

    A man walk 3km East and then 4km North what is his resultant displacement? Suppose he walk 3km and 4km 60(degree) North of East. What is the displacement?

    asked by Yusuf on March 30, 2017
  56. physic

    A ball is thrown straight upward and returns to the thrower's hand after 2.00 s in the air. A second ball thrown at an angle of 40.0° with the horizontal reaches the same maximum height as the first ball. (a) At what speed was the first ball thrown? m/s

    asked by mark on February 3, 2016
  57. Physic

    A sodium-vapour lamp illuminates, with monochromatic yellow light, two narrow slits that are 1.00 mm apart. if the viewing screen is 1.00m from the slits and the distance from the central bright line to the next bright line is 0.589 mm, what is the

    asked by Sanaz on August 22, 2012
  58. physic

    you need to extend a 2.50 inch diameter pipe, but you only have 1.00 inch diameter pipe on make a fitting to connect these pipes end to end. if the water is flowing at 6.00cm/s in the wide pipe, how fast will it be flowing through the narrow one?

    asked by steve on July 20, 2010
  59. physic

    can somebody show me how to find the time s step by step. A golfer hits his approach shot at an angle of θ = 46.3°, giving the ball an initial speed of v0 = 39.6 m/s (see figure below). The ball lands on the elevated green, yf = 4.1 m above the initial

    asked by joy on February 6, 2018
  60. physic

    Tadeh launches a model rocket straight up from his backyard that takes 6.96 s to reach its maximum altitude. (After launch, the rocket's motion is only influenced by gravity. Enter magnitudes only.) (a) What is the rocket's initial velocity? m/s (b) What

    asked by joy on January 24, 2018
  61. Physic

    Find the resultant of the following two displacements; 2.0 m 40 degrees 4.0 meters at 127 degrees. the angles are taken relative to the x-axis

    asked by Anonymous on May 12, 2017
  62. physic

    adaobi walks 2km due west and 2km due south calculate the displacement of the girl

    asked by tobey on December 12, 2011
  63. physic

    A kid with a mass of 30 kg slides down a slide 2.5 meters high from rest a. What was his speed at the bottom? b. If his speed was only 1 m/s at the bottom, how much energy was lost due to friction?

    asked by Laurdiel on November 17, 2015
  64. physic

    An unmarked police car traveling a constant 95km/h is passed by a speeder. Precisely 2.00s after the speeder passes, the police officer steps on the acceleratorIf the police car accelerates uniformly at 3.00m/s2 and overtakes the speeder after accelerating

    asked by mucray on July 6, 2013
  65. physic

    An airplane flies due north at 200 km/h relative to the air. There is a wind blowing at 70 km/h to the northeast relative to the ground. What are the plane's speed and direction relative to the ground?

    asked by BILLY on December 5, 2012
  66. physic

    A sounding rocket, launched vertically upward with an initial speed of 79.0 m/s, accelerates away from the launch pad at 5.70 m/s2. The rocket exhausts its fuel, and its engine shuts down at an altitude of 1.15 km, after which it moves freely under the

    asked by joy on January 23, 2018
  67. physic

    y(x,t) = (6.50 mm)sin2pi((t/0.0360 s)-(x/0.280m)) Determine the wave's (a) amplitude (b) wavelength (c) frequency (d) speed of propagation and (e) direction of propagation

    asked by jun on January 26, 2017
  68. physic

    The windpipe of one typical whooping crane is 5.3 feet long. What is the fundamental resonant frequency of the bird's trachea, modeled as a narrow pipe closed at one end? (Assume a temperature of 35°C.) Hz Need Help? Read It

    asked by Maka on November 29, 2014
  69. physic

    A roller-coaster car has a mass of 500 kg when fully loaded with passengers. The car passes over a hill of radius 15 m, as shown. At the top of the hill, the car has a speed of 8 m/s. What is the force of the track on the car at the top of the hill?

    asked by yusra on April 18, 2010
  70. Physic

    7.7 mol of helium are in a 16 {\rm L} cylinder. The pressure gauge on the cylinder reads 65psi. What are (a) the temperature of the gas in Celsius and (b) the average kinetic energy of a helium atom?

    asked by ana on November 21, 2009
  71. physic

    Crall and Whipple attached a fan to a cart placed on a level track and then released the cart. They made a position-versus-time graph (see figure below) and fit a curve to these data such that x = 0.036 m + (0.0080 m/s)t + (0.10 m/s2)t2. (a) Find the

    asked by joy on January 23, 2018
  72. physic

    A concave makeup mirror is designed so that a person 29 cm in front of it sees an upright image magnified by a factor of two. What is the radius of curvature of the mirror?

    asked by megan on March 14, 2016
  73. physic

    a 2.00kg object A is connected with a massless string across a massless, frictionless pulley to a 3.00kg object B. the smaller object rests on an inclined plane which is tilted at an angle of theta=40degrees. what are the acceleration of the system and the

    asked by EMMA on July 7, 2014
  74. Physic

    A point charge q1=-8 is located at the orgin of a rectangular coordinate system. A second charge q2=6nC is located at a distance of 0.2m from the orgin on the positive x-axis, and a third charge q3=12nC is located at a distance of 0.2m on the positive

    asked by Nikki on March 14, 2012
  75. physic

    Calculate the true mass (in vacuum) of a piece of aluminum whose apparent mass is 4.5000 kg when weighed in air.

    asked by Ash on August 8, 2010
  76. physic

    a skater with moment of inertia 15 kgm2 begins a spin with an angular speed of 6.0 rad/s by changing the position of her arms, the skater decreases her moment of inertia by 50% what is the skaters final angular speed

    asked by amro on November 7, 2016
  77. physic

    A spring lies on a horizontal table, and the left end of the spring is attached to a wall. The other end is connected to a box. The box is pulled to the right, stretching the spring. Static friction exists between the box and the table, so when the spring

    asked by nada on January 20, 2014
  78. physic

    A Ferris wheel 26.0m in diameter rotates once every 15.0s . What is the ratio of a person's apparent weight to her real weight at the top?

    asked by cuzer on July 13, 2013
  79. physic

    The figure below shows a standing wave oscillating at 95 Hz on a string. The distance d between the two walls equals 70 cm. What is the wave speed? pic have 3 waves

    asked by Anonymous on September 21, 2011
  80. physic

    Eight books, each 8.5 cm thick with mass 1.3 kg, lie flat on a table.How much work is required to stack them one on top of another?

    asked by Anonymous on October 14, 2010
  81. physic

    How long (in ns) does it take light to travel 1.00 m in vacuum? What distance does light travel in water during the time that it travels 1.00 m in vacuum?

    asked by mary on January 28, 2010
  82. physic

    500 J of work are done in 4 seconds to lift a 40 kg box to the top of a high shelf. How much power was required to complete the lift

    asked by cody on June 26, 2018
  83. physic

    A particle's position is given by z(t) = −(8.10 m/s^2)t^2k for t ≥ 0. (Express your answer in vector form.) (a) Find the particle's velocity at t = 3.00 s and t = 6.00 s.

    asked by joy on January 21, 2018
  84. Physic

    A soldier is tasked with measuring the muzzle velocity of a new rifle. Knowing the principles of projectile motion, he decides to perform a simple experiment at the indoor firing range. The soldier hangs a target a distance of d = 113 m from the end of the

    asked by TJ on September 10, 2014
  85. Physic

    How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the Earth) of one of the protons?

    asked by Asiay on January 27, 2014
  86. physic

    A mechanic pushes a 2,500 kg car from rest to a speed v, with 5000J of work. During this process the car moves 25m. Neglecting friction, calculate: a) the final velocity of car b) The horizontal force exerted on the car

    asked by Luz on November 7, 2010
  87. Physic

    Two reasons why displacement method is not suitable when determining the volume of a charcoal?

    asked by Michael on April 23, 2019
  88. Physic

    A Uniform beam 6.0 metre long and weighing 4kg rest on supports at p and q placed left and right 1.0 metre from each end of the beam. Weights of mass 10kg and 8kg are placed near p and q respectively one each end of the beam. Calculate the reactions at p

    asked by Stephen on February 18, 2019
  89. physic

    A rock is thrown upward from the level ground in such a way that the maximum height of its flight is equal to its horizontal range R. (a) At what angle is the rock thrown? (b) Would your answer to part (a) be different if the rock is thrown with the same

    asked by giz on October 1, 2015
  90. physic

    A swing ride at a carnival consists of chairs that are swung in a circle by 11.0-m cables attached to a vertical rotating pole, as the drawing shows. Suppose the total mass of a chair and its occupant is 164 kg, the angle θ = 58°. Find the speed of the

    asked by john bear on September 28, 2015
  91. PHYSIC

    125 g of dry ice (solid CO2) is dropped into a beaker containing 500 g of 66°C water. The dry ice converts directly to gas, leaving the solution. When the dry ice is gone, the final temperature of the water is 29°C. What is the heat of vaporization of

    asked by SERA on August 14, 2015
  92. Physic

    A massless rope is wrapped around a hollow cylinder of radius 23 cm whose central axis is fixed in a horizontal position. A mass of 3.8 kg hangs from the rope and, starting from rest, moves 137 cm in 2.2 s. What is the mass of the cylinder? (Answer: 62kg)

    asked by Anonymous on May 6, 2014
  93. Physic

    A sodium-vapour lamp illuminates, with monochromatic yellow light, two narrow slits that are 1.00 mm apart. if the viewing screen is 1.00m from the slits and the distance from the central bright line to the next bright line is 0.589 mm, what is the

    asked by sara on August 23, 2012
  94. physic

    if you apply a force of 1.0N to a cart of mass 1.0kg with negligible friction, what do you expect the acceleration to be?

    asked by wiki on October 18, 2009
  95. physic

    Find the acceleration of the block of mass M = 5.06 kg in the figure below. (Take m = 4.24 kg.)

    asked by joy on February 28, 2018
  96. physic

    A particle moving with uniform retardation covers distance 18 M, 14 M and 10 m in successive seconds it comes to rest after travelling a further distance of

    asked by ruchiket on August 3, 2017
  97. physic

    1. A 57 g tennis ball is moving to the left at 36.2 m/s. It collides with a wall and rebounds to the right. The tennis ball is in contact with the wall for 0.107 s and it loses 14% of its kinetic energy during the impact. What is the average force

    asked by dan on April 20, 2017
  98. physic

    In compressed state, a spring 3.00 meters long hanging from the ceiling has a potential energy of 2.0 joules. If the entire potential energy is used to release a ball of mass 1.2 kilograms vertically downward, then what is the kinetic energy of the ball

    asked by andrea on October 16, 2015
  99. Physic

    A bullet of mass 0.05kg has a speed of 400cm|s. What is its kinectic energy? It hits a wall of which the average resistive force is 1000N, Cal.the distance penestrated by the bullet

    asked by David on August 10, 2015
  100. physic

    As you look out of your dorm window, a flower pot suddenly falls past. The pot is visible for a time t, and the vertical length of your window is Lw. Take down to be the positive direction, so that downward velocities are positive and the acceleration due

    asked by koram on October 3, 2013


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