Most popular questions, page 3
  1. physic

    If a curve with a radius of 80m is properly banked for a car traveling 63km/h , what must be the coefficient of static friction for a car not to skid when traveling at 97km/h ?

    asked by fermona on July 6, 2013
  2. Physic

    A block (mass 2.4 kg) is hanging from a massless cord that is wrapped around a pulley -3 2 (moment of inertia of the pulley = 1.3 x 10 kg·m ), as the drawing shows. Initially the pulley is prevented from rotating and the block is stationary. Then, the

    asked by Jess on February 4, 2013
  3. Physic

    A 55-kg female bungee jumper fastens one end of the cord (made of elastic material) to her ankle and the other end to a bridge. Then she jumps off the bridge. As the cord is stretching, it exerts an elastic force directed up on her. Calculate her

    asked by Michelle on October 19, 2011
  4. physiC

    A uniform door (0.81 m wide and 2.1 m high) weighs 150 N and is hung on two hinges that fasten the long left side of the door to a vertical wall. The hinges are 1.9 m apart. Assume that the lower hinge bears all the weight of the door. Determine the

    asked by lina on March 1, 2011
  5. physic

    An air-track glider attached to a spring oscillates between the 3.00 cm mark and the 50.0 cm mark on the track. The glider completes 10.0 oscillations in 36.0 s. What is the period of the oscillations? What is the frequency of the oscillations? What is the

    asked by peggy on December 5, 2009
  6. physic

    A ball is shot from the top of a building with an initial velocity of 16m/s at an angle θ = 43∘ above the horizontal. Part A What are the horizontal and vertical components of the initial velocity? If a nearby building is the same height and 55m away,

    asked by koram on October 11, 2013
  7. physic

    A hockey player strikes a puck that is initially at rest. The force exerted by the stick on the puck is 950 N, and the stick is in contact with the puck for 4.4 ms (0.0044 s). (a) Find the impulse imparted by the stick to the puck. (b) What is the speed of

    asked by glenmore on December 4, 2011
  8. Physic

    A 89.0 kg person stands on one leg and 90% of the weight is supported by the upper leg connecting the knee and hip joint-the femur. Assuming the femur is 0.640 m long and has a radius of 1.90 cm, by how much is the bone compressed?

    asked by Bret on May 7, 2011
  9. Physic

    If 0.045 kg of ice at 0 C is added to 0.390 kg of water at 34 C in a 0.150 kg aluminum calorimeter cup, what is the final temperature of the water? Please help!

    asked by Anonymous on May 6, 2011
  10. Physic

    1.What is responsible for the __ g, we experience on the surface of the Earth? 2.Why do astronauts feel weightless in space shuttles? 3. Where in the body do we sense rotation?

    asked by Soul on November 30, 2018
  11. Physic

    Two cars A and B are moving along astaight road in the same direction with velocity of 25km/h and 40km/h, respectively. Find the velocity of car B relative to car A?

    asked by Nardos on November 13, 2015
  12. physic

    Suzie (of mass 58 kg) is roller-blading down the sidewalk going 36 miles per hour. She notices a group of workers down the walkway who have unexpectedly blocked her path, and she makes a quick stop in 2 . 4 seconds. What is Suzie’s average acceleration?

    asked by jay on November 17, 2013
  13. 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 11, 2013
  14. physic

    a uniform meter stick of mass 100g is pivoted about the 30 cm mark. a mass of 200 g is placed at the 10 cm mark. where should a mass of 50 g be placed so that the meter stick balance horizontally?

    asked by visoth on April 25, 2012
  15. Physic

    A 290-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 31° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest?

    asked by Nikki on November 10, 2011
  16. physic

    What hanging mass will stretch a 2.2-m-long, 0.40 - diameter steel wire by 1.1 ?

    asked by roadking on October 22, 2011
  17. physic

    Two equal masses are attached to separate identical springs next to one another. One mass is pulled so its spring stretches 20 cm and the other is pulled so its spring stretches only 10 cm. The masses are released simultaneously.Which mass reaches the

    asked by leya on December 13, 2010
  18. physic

    to move a large crate across a rough floor, you push down on it at an angle of 21 degree. find the force necessary to start the crate moving, given mass of the crate is 32 kg and the coefficient of static friction between the crate and the floor is 0.57

    asked by sid on November 7, 2010
  19. physic

    Six roller-coaster carts pass over the same semicircular "bump." The mass M of each cart (including passenger) and the normal force n of the track on the cart at the top of each bump are given in the figures. Iam given the force in N of the cart at the

    asked by mike on October 27, 2010
  20. physic

    HI!can anyone help me please, just on part b.Thank you so much. 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

    asked by Chan on November 30, 2009
  21. physic

    Hooke's law describes a certain light spring of unstretched length 30.0 cm. When one end is attached to the top of a door frame, and a 8.40-kg object is hung from the other end, the length of the spring is 40.00 cm. (a) Find its spring constant. ____ kN/m

    asked by Chan on October 21, 2009
  22. Physic

    Why do protons in a very large nucleus have a greater chance of flying apart by electrical repulsion?

    asked by Will on November 13, 2007
  23. Physic

    Calculate the mass of a bus if it produces o force of 14,000N while accelerating at a rate of 5 m/s^2

    asked by Sagar Chhetri on March 12, 2019
  24. physic

    A hand-driven tire pump has a piston with a 2.50 cm diameter and a maximum stroke of 30 cm. how much work do you do in one stroke if the average gauge pressure is 2.40×105 N.m – 2? Select one: a. 141 J b. 4.5×107 J c. 35.3 J d. 1.41 ×108 J

    asked by lana on May 26, 2016
  25. physic

    A figure skater glides along a circular path of radius 5.20 m. (a) If she coasts around one half of the circle, find the magnitude of the displacement vector. m (b) If she coasts around one half of the circle, find what distance she skated. m (c) What is

    asked by mary on February 3, 2016
  26. physic

    A stationary 2.0 kg object is located on a table near the surface of the earth. The coefficient static friction between the surface is .80 and the coefficient of the kinetic friction is 0.65. A horizontal force of 5N is applied to the object. Determine the

    asked by pam on March 27, 2014
  27. physic

    A charge of -2.73 μC is fixed in place. From a horizontal distance of 0.0465 m, a particle of mass 9.50 x 10-3 kg and charge -9.56 μC is fired with an initial speed of 97.2 m/s directly toward the fixed charge. What is the distance of closest approach?

    asked by derek on October 11, 2012
  28. physic

    A 1500 kg car moving at 10 m/s is stopped by the action of its brakes. The work done by the car's brakes is ____ Joules.

    asked by Anonymous on July 17, 2012
  29. Physic

    An electric motor rotating a workshop grinding wheel at a rate of 114 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.10 rad/s2. (a) How long does it take for the grinding wheel to stop?

    asked by Anthony on November 14, 2011
  30. physic

    A 1.0-kg steel ball and a 2.0-m cord of negligible mass makeup a simple pendulum that can pivot without friction about thepoint O, as in the picture below. This pendulum isreleased from rest in a horizontal position, and when the ball isat its lowest point

    asked by Anonymous on February 27, 2011
  31. physic

    A water skier has a mass of 73 kg. Find the magnitude of the net force acting on the skier when she lets go of the tow rope and glides to a halt in 20 s.

    asked by hy on December 4, 2010
  32. physic

    The resistivity of gold is at a temperature of 20°C. A gold wire, 1.8 mm in diameter and 14 cm long, carries a current of 480 ma. The power dissipated in the wire is closest to:

    asked by paul on August 4, 2010
  33. Physic

    Three uniform spheres of masses m1 = 3.50 kg, m2 = 4.00 kg, and m3 = 5.50 kg are placed at the corners of a right triangle (see figure below). Calculate the resultant gravitational force on the object of mass m2, assuming the spheres are isolated from the

    asked by Anonymous on May 25, 2017
  34. physic

    A rod is 2.40 m long and has a diameter of 2.50 mm. A force of 2000 N is applied to the end to stretch the rod by 1.40 mm. What is the tensile modulus for this rod?

    asked by ngeyoo on April 16, 2016
  35. Physic

    A positive charge of 4.90 μC is fixed in place. From a distance of 3.20 cm a from the fixed positive charge, a particle of mass 5.00 g and charge +3.20 μC is released from rest. What is the speed of the +3.20 μC when it is 7.50 cm away from the fixed

    asked by Julie on July 28, 2015
  36. physic

    The drawing shows a device that you can make with a piece of cardboard, which can be used to measure a person's reaction time. Hold the card at the top and suddenly drop it. Ask a friend to try to catch the card between his or her thumb and index finger.

    asked by Anonymous on January 28, 2014
  37. physic

    A satellite circles a spherical planet of unknown mass in a circular orbit of radius 1.9×107m . The magnitude of the gravitational force exerted on the satellite by the planet is 140N . What would be the magnitude of the gravitational force exerted on the

    asked by kerat on July 13, 2013
  38. physic

    If you run a complete loop around an outdoor track(400m), in 100 second,what is your average velocity?

    asked by syida on July 12, 2011
  39. Physic

    A race car makes two and a half laps around a circular track in 4.5 min. What is the car's average angular speed?

    asked by Anonymous on May 8, 2011
  40. Physic

    A flywheel rotates with an angular speed of 26 rev/s. As it is brought to rest with a constant acceleration, it turns 55 rev. What is the magnitude of the angular acceleration? How much time does it take to stop?

    asked by Maria on May 8, 2011
  41. physic

    Water flows through a 4.0-cm-diameler horizontal pipe ata speed uf 1.3 m/s. The pipe then narrows down to a diameter of 2.0 cm. Ignoring viscosity, what is the pressure difference between the wide and narrow sections of the pipe

    asked by john on November 19, 2009
  42. physic

    Hi! Question:A ball is tossed from an upper-story window of a building.The ball is given an initial velocity of 7.80m/s at an angle of 21.0 degrees below the horizontal.It strikes the ground 3.00s later. A.How far horizontally from the base of the building

    asked by Chan on September 30, 2009
  43. physic

    1. A surface charge can be produced on insulators by a. grounding b. induction c. polarization d. contact 2. Unlike insulators, conductors can be charged by a. grouding b. induction c. polarization d. contact The easy way to charge an insulator is by

    asked by Jannie on March 29, 2007
  44. Physic

    A man holds a child on his shoulders while watching a football match.How much work has he done if the game last for two hours

    asked by Anonymous on February 26, 2019
  45. Physic

    Two resistors when connected in series to a 120-V line use one-fourth the power that is used when they are connected in parallel. If one resistor is 4.8 kohms. what is the resistance of the other?

    asked by Allen on April 9, 2015
  46. physic

    A man pushes a wooden box across the floor at a constant speed of 0.5 m/s by applying a horizontal force of 200N. Wht is the value of the force of friction on the box? Explain your answer.

    asked by sheriff on March 25, 2015
  47. Physic

    A ball is thrown toward a cliff of height h with a speed of 28m/s and an angle of 60∘ above horizontal. It lands on the edge of the cliff 3.3s later. a) How high is the cliff? i got 26.7 m b) What was the maximum height of the ball? my answer here was 30

    asked by Please help me with the last question on October 22, 2014
  48. physic

    A man is running at speed c (much less than the speed of light) to catch a bus already at a stop. At t=0, when he is a distance b from the door to the bus, the bus starts moving with the positive acceleration a. Use a coordinate system with x=0 at the door

    asked by metu on October 4, 2012
  49. physic

    An 85.0-N backpack is hung from the middle of an aluminum wire, The degree of hung of the wire is 3 degree. The temperature of the wire then drops by 20.0 C¡ã. Find the tension in the wire at the lower temperature. Assume that the distance between the

    asked by firous on March 31, 2010
  50. physic

    please help me.A 5.00 g object moving to the right at +20.0 cm/s makes an elastic head-on collision with a 10.0 g object that is initially at rest. (a) Find the velocity of each object after the collision. 5.00 g object 10.0 g objectt (b) Find the

    asked by Chan on October 28, 2009
  51. Physic

    A space station that does not rotate cannot simulate gravity for its occupants. A)True B)False From within a rotating reference frame, the centrifugal force simulates gravity. A)True B)False On a rotating station, a person at the center of the station, in

    asked by Q on November 30, 2018
  52. Physic

    A blue ball is thrown upward with an initial speed of 21.0 m/s, from a height of 0.8 meters above the ground. 2.6 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.3 m/s from a height of 24.6 meters above the

    asked by First name on February 11, 2018
  53. physic

    A particle with mass m = 3.80 kg accelerates according to a = (−2.60i + 1.70j) m/s2. (a) What is the net force acting on the particle? (Express your answer in vector form.) F = N (b) What is the magnitude of this force? N

    asked by joy on February 5, 2018
  54. Physic

    you have to push with a force of 200N to slide a refrigerator across a floor at constant velocity.What is the force of friction acting on the fridge?

    asked by nicholas on December 7, 2016
  55. physic

    A motorcycle racer traveling at 145 km/h loses control in a corner of the track and slides across the concrete surface. The combined mass of the rider and bike is 243 kg. The steel of the motorcycle rubs against the concrete road surface. (a) What is the

    asked by hassan yousif on July 16, 2016
  56. Physic

    You see a bolt of lightning and hear thunder two seconds later. The speed of sound is about 343 m/s. Estimate?

    asked by Mary on October 25, 2015
  57. Physic

    A 60-g bullet fired at two blocks resting on a surface with coefficient of kinetic friction =0.5. The bullet pass through a 8-kg block and make this block slides 0.8 m. And then the bullet lodges in another block which is 6 kg. The bullet make it slides

    asked by Takako on March 3, 2015
  58. Physic

    A grenade that is falling vertically explodes into two equal fragments when it is at a height of 2000 m and has a downward velocity of 60 m/s. Immediately after the explosion one of the fragments is moving downward at 80 m/s. Find the position of the

    asked by kevin on December 11, 2014
  59. physic

    A pig slides down a 29° incline in twice the time it would take to slide down a frictionless 29° incline. What is the coefficient of kinetic friction between the pig and the incline?

    asked by Dina on October 26, 2014
  60. physic

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

    asked by Renee on April 6, 2014
  61. physic

    11. What is the acceleration of a 4000 kg airplane that has a force on it of 24,000 N

    asked by alisa on October 30, 2012
  62. physic

    a bullet is fired from the ground at the angle of 30 degree above the horizontal,What initial speed must the bullet have in order to hit a point 250 ft high on a tower located 400 ft away (ignoring air resistance),what the solution?

    asked by aisya on April 11, 2012
  63. physic

    A student on a piano stool rotates freely with an angular speed of 3.07 rev/s. The student holds a 1.38 kg mass in each outstretched arm, 0.759 m from the axis of rotation. The combined moment of inertia of the student and the stool, ignoring the two

    asked by Mary on March 25, 2010
  64. physic

    Hi!Two forces are applied to a car in an effort to move it, as shown in the following figure, where F1 = 439 N(10degree) and F2 = 365 N(30degree). (Assume up and to the right as positive directions.) (a) What is the resultant of these two forces?

    asked by Chan on October 12, 2009
  65. physic

    The Moon orbits Earth in a nearly circular orbit that lasts 27.32 days. Determine the distance from the surface of the Moon to the surface of Earth.

    asked by joy on February 24, 2018
  66. physic

    A jetliner travels with a constant speed of 597.4 km/h relative to the air to a city 780.1 km due south. (a) What is the time interval required to complete the trip if the jetliner is experiencing a headwind of 41.1 km/h toward the north? h (b) What is the

    asked by joy on January 31, 2018
  67. physic

    A wheel on a moving car slows uniformly from 420 rpm to 120 rpm in 4 sec. A. What is the angular acceleration of the wheel? B. What is the angular displacement? How many revolutions? C. How far does the car travel if the radius of the wheel is 0.20cm?

    asked by piggy on February 5, 2015
  68. Physic

    A father pushes horizontally on his daughter's sled to move it up a snowy incline, as illustrated in the figure, with h = 3.7 m and θ = 18°. The total mass of the sled and the girl is 35 kg and the coefficient of kinetic friction between the sled runners

    asked by Thanh on November 18, 2012
  69. physic

    3 charges sit on vertical equilateral triangle the side of each is 30.0 cm. if the triangle are A= +4.0 uC B=+5.0 uC and C=+6.0 uC (clockwise from top) what is the force on each charge?

    asked by sara on August 17, 2012
  70. Physic

    A ball is projected vertically up word from the top of tower 60m ,hight with velocity 30m ,what is the mex heigh above the ground leve? How long it take to reach the ground

    asked by Anonymous on March 8, 2012
  71. physic

    A person stands on a bathroom scale in a motionless elevator begins to move,the scale briefly reads only 0.75 of th person regular weight(means Fn=0.75mg).Calculate the acceleration of the elevator,and find the direction of acceleration.

    asked by noah on July 10, 2011
  72. physic

    How much current will be flowing through a 57.0m length of copper wire with radius 5.7mm if it is connected to a source supplying 620V. (The resistivity of copper is 1.68x10^-8ohm's.m

    asked by kris on August 4, 2010
  73. Physic

    an someone please help me out on this... An ideal transformer has 50 turns in its primary and 250 turns in its secondary. 12 V ac is connected to the primary. Find: 1. The volts ac available at the secondary 2. Current in the 10  device connected to t

    asked by Ollie on November 2, 2007
  74. Physic

    A ball B1 is dropped from the top of a building, one second later another ball, B2 is thrown down with an initial speed of 20.0m/s. The two balls hit the ground at the same time. 1)What is the time it took B1 to teach the ground? 2) What is the height of

    asked by Heeelllp on March 24, 2017
  75. Physic

    John carries a 200 N suitcase up three flights of stairs (a height of 10 m) and then pushes it with a horizontal force of 50 N at a constant speed of 0.5 m/s for a horizontal distance of 35 meters. How much work does Ben do on his suitcase during this

    asked by Help me on April 6, 2016
  76. physic

    A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.50 m/s at an angle of 15.0° below the horizontal. It strikes the ground 3.00 s later. (a) How far horizontally from the base of the building does the

    asked by mark on February 3, 2016
  77. Physic

    A person pulls a toboggan for a distance of 43.1 m along the snow with a rope directed 33.3 ° above the snow. The tension in the rope is 109 N. (a) How much work is done on the toboggan by the tension force? (b) How much work is done if the same tension

    asked by Lena on March 5, 2015
  78. Physic

    An electron is released from rest in a uniform electric field and accelerates to the north at a rate of 115 m/s^2.Determine the magnitude and direction of electric field.

    asked by Syam on December 16, 2014
  79. Physic

    The figure below shows a block of mass m resting on a 20¡ã slope. The block has coefficients of friction ¦Ìs = 0.73 and ¦Ìk = 0.53 with the surface. It is connected via a massless string over a massless, frictionless pulley to a hanging block of mass

    asked by Jason on March 3, 2014
  80. 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 12, 2013
  81. physic

    a negative charge of -0.55 uc an unknown charge 0.300 m diectly below it. what are the magnitude an direction of the force that unknown charge exerts on the -0.550 uc charge ?

    asked by yanis on February 12, 2013
  82. PHYSIC

    What current is required in the winding of a long solenoid that has 1000 turns uniformly distributed over a length of 0.4 m, to produce at the center of the solenoid a magnetic field of magnitude 1.0 x 10 -4 T?

    asked by KAIT on September 3, 2011
  83. physic

    The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force SM that the sun exerts on the moon is perpendicular to the force EM that the earth exerts on the moon. The masses are: mass of sun = 1.99 1030 kg, mass of

    asked by hy on November 21, 2010
  84. physic

    A 4 kg object is attached to a vertical rod by two strings, as in the figure. The object rotates in a horizontal circle at constant speed 6 m/s. Find the tension in (a) the upper string and (b) the lower string.

    asked by yusra on April 18, 2010
  85. physic

    Hi! could you help this problem please try so many time but, the answer is not correct. Question:The tires on a new compact car have a diameter of 2.0 ft and are warranted for 62,000 miles. (a) Determine the angle (in radians) through which one of these

    asked by Chan on November 15, 2009
  86. Physic

    1. A bicyclist and a parked car have a head-on collision. Compare the relative motions on each. 2. Why isn't the Earth pulled into orbit around a communication satellite?

    asked by Anonymous on October 29, 2018
  87. physic

    A 2000 N sled is pulled along a horizontal surface with a constant force by means of a rope that makes an angle of 30.0o with the horizontal. If the tension in the rope is 500 N and there is 100 N of frictional force between the sled and the surface, find

    asked by sk on May 8, 2016
  88. Physic

    A winch drags a 200 kg crate along a 15 degrees incline at 0.2 m/s. The coefficient of kinetic friction is 0.22. What is the power required as the crate moves up the slope?

    asked by Naniso on November 5, 2015
  89. Physic

    A crate of mass 20kg was moved up a rough plane inclined at 30degree to the ground. If the crate was moved a distance of 5m after 10mins. Determine the total rate at work done.

    asked by Hafsat Abdulmalik on May 17, 2015
  90. physic

    A 1250 kg wrecking ball is lifted to a height of 12.7 m above its resting point. When the wrecking ball is released, it swings toward an abandoned building and makes an indentation of 43.7 cm in the wall. a. What is the potential energy of the wrecking

    asked by wellington on December 18, 2014
  91. physic

    a car travels east at 89 km/h for 1 then travels 26 east of north at 141 km/h for another 1 hour. a)what is the average speed for the trip? b)what is the average velocity for the trip?

    asked by siti on September 8, 2014
  92. physic

    A dielectric-filled parallel-plate capacitor has plate area A = 10.0cm2 , plate separation d = 7.00mm and dielectric constant k = 3.00. The capacitor is connected to a battery that creates a constant voltage V = 7.50V . Throughout the problem, use ϵ0 =

    asked by asasa on April 27, 2014
  93. Physic

    A boy of mass 50kg runs up a set of stress of total height 3.0m. Find the work done against gravity

    asked by Commerade on February 3, 2014
  94. physic

    a 2500 car enters curve with a radius of 45 m .if the car is moving at speed of 35 m/s.what is the centripetal force that maintains the car s circular motion the curve ?

    asked by said on March 4, 2013
  95. physic

    A grinding wheel of radius 0.280 m rotating on a frictionless axle is brought to rest by applying a constant friction force tangential to its rim. The constant torque produced by this force is 75.3 N · m. Find the magnitude of the friction force.

    asked by Anonymous on July 29, 2012
  96. physic

    Before practicing his routine on the rings, a 67 kg gymnast hangs motionless, with one hand grasping each ring and his feet touching the grounnd. Both arms make an angle of 24 degrees with the vertical.(a) If the force exerted by the rings on each arm has

    asked by taylor on November 6, 2011
  97. physic

    The amount of heat released when 100 grams of steam at 100 degrees Celsius is converted into liquid water at 100 degrees Celsius is ____ J.

    asked by bode on March 26, 2011
  98. physic

    An object attached to the end of a string swings in a vertical circle (R = 1.2 m), as shown. At an instant when ƒá = 30„a, the speed of the object is 5.1 m/s and the tension in the string has a magnitude of 20 N. What is the mass of the object?

    asked by yusra on April 18, 2010
  99. physic

    A police officer arrives at the scene of the collision of the two snowmobiles (Figure 1) to find both drivers unconscious. When the two vehicles collided, their skis became entangled and the two snowmobiles remained locked together as they skidded to a

    asked by sam on April 2, 2007
  100. Physic

    What is the power of an engine that pulls a automobile at asteady speed of 10m/s along a level road

    asked by Mahesh kumar on January 23, 2019


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