alba

Most popular questions and responses by alba
  1. ap physics

    A force of magnitude Fx acting in the x-direction on a 2.55-kg particle varies in time as shown in the figure below. (Indicate the direction with the sign of your answer.) (a) Find the impulse of the force. (Give your answer to one decimal place.) kg ·

    asked on February 22, 2015
  2. language arts

    in the poem “cynthia in the snow” by gwendolyn brooks. what does the word “whirs” mean in line 7. a. short turning b. slow swish c. long creak d. fast alarm

    asked on March 6, 2018
  3. Chemistry

    pKa1 = 2.148, pKa2 = 7.198, pKa3 = 12.375 You wish to prepare 1.000L of a 0.0100M Phosphate buffer at pH7.55. To do this, you choose to use mix the two salt fomrs involved in the second ionization, NaH2PO4 and Na2HPO4, in a 1.000L volumetric flask and add

    asked on February 22, 2013
  4. physics

    A horizontal plank 4.12 m long and having mass 26.8 kg rests on two pivots, one at the left end and a second 1.03 m from the right end. Find the magnitude of the force exerted on the plank by the second pivot. N

    asked on March 6, 2015
  5. matematicas

    in a class of 25 students, 15 play hockeyand 16 play basketball. if there are 4 students who play neither sport, determine the number of students who play both hockey and basketball

    asked on December 6, 2015
  6. AP physics

    A 0.278-kg volleyball approaches a player horizontally with a speed of 16.2 m/s. The player strikes the ball with her fist and causes the ball to move in the opposite direction with a speed of 22.4 m/s. (a) What impulse is delivered to the ball by the

    asked on February 22, 2015
  7. physics

    A satellite is in a circular orbit around the Earth at an altitude of 3.30 106 m. (a) Find the period of the orbit. (Hint: Modify Kepler's third law so it is suitable for objects orbiting the Earth rather than the Sun. The radius of the Earth is 6.38 106

    asked on February 22, 2015
  8. physics

    Find the net torque on the wheel in the figure below about the axle through O perpendicular to the page, taking a = 5.00 cm and b = 23.0 cm. (Indicate the direction with the sign of your answer. Assume that the positive direction is counterclockwise.) f1=

    asked on March 4, 2015
  9. physics

    A man opens a 1.14-m wide door by pushing on it with a force of 49.5 N directed perpendicular to its surface. (a) What magnitude torque does he apply about an axis through the hinges if the force is applied at the center of the door? N · m (b) What

    asked on March 6, 2015
  10. physics

    A construction crane's cable lifts a 49.5-kg box upward with an acceleration of 1.30 m/s2. Find the tension in the rope. N

    asked on March 6, 2015
  11. physics

    In a popular amusement park ride, a rotating cylinder of radius R = 2.60 m is set in rotation at an angular speed of 4.00 rad/s, as in the figure shown below. The floor then drops away, leaving the riders suspended against the wall in a vertical position.

    asked on February 22, 2015
  12. physics

    A worker applies a torque to a nut with a wrench 0.485 m long. Because of the cramped space, she must exert a force upward at an angle of 57.0° with respect to a line from the nut through the end of the wrench. If the force she exerts has magnitude 81.5

    asked on March 6, 2015
  13. physics

    A disk of mass m is spinning freely at 6.22 rad/s when a second disk of identical mass, initially not spinning, is dropped on it so that their axes coincide. In a short time the two disks are corotating. (The two disks have the same radius.) (a) What is

    asked on March 6, 2015
  14. physics

    A student rides his bicycle at a constant speed of 2.20 m/s along a straight, level road. If the bike's tires each have a radius of 0.338 m, determine the following. (a) What is the tires' angular speed? rad/s (b) What is the net torque on each tire? N ·

    asked on March 6, 2015
  15. physics

    A 310-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 25° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest? rad/s

    asked on March 8, 2015
  16. physics

    Solve the equations 1 2 mv2 + 1 2 Iω2 = mgh and v = rω for the speed v using substitution, given that I = mr2 and h = 4.20 m. (Note that mass m and radius r will both cancel, so their numerical values aren't required.)

    asked on March 6, 2015
  17. physics

    A basketball player entertains the crowd by spinning a basketball on his nose. The basketball has a mass of 0.622 kg and a radius of 0.116 m. If the basketball is spinning at a rate of 7.00 revolutions per second, determine the following. Treat the ball as

    asked on March 6, 2015
  18. physics

    A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 280 N applied to its edge causes the wheel to have an angular acceleration of 0.960 rad/s2. (a)

    asked on March 8, 2015
  19. physics

    What is the magnitude of the angular acceleration of a 25.5-kg disk of radius 0.775 m when a torque of magnitude 41.5 N · m is applied to it? rad/s2

    asked on March 6, 2015
  20. physics

    After the Sun exhausts its nuclear fuel, its ultimate fate may be to collapse to a white dwarf state. In this state, it would have approximately the same mass as it has now, but its radius would be equal to the radius of the Earth. (a) Calculate the

    asked on February 22, 2015
  21. physics

    A spinning wheel steadily slows from an initial angular velocity of 1.65 rev/s to 0.485 rev/s in 12.2 s. (a) Calculate the wheel's angular acceleration in radians per second squared. rad/s2 (b) What angle does it go through during that time? rad

    asked on March 6, 2015
  22. physics

    A bowling ball of mass 7.45 kg is rolling at 2.56 m/s along a level surface. (a) Calculate the ball's translational kinetic energy. J (b) Calculate the ball's rotational kinetic energy. J (c) Calculate the ball's total kinetic energy. J (d) How much work

    asked on March 6, 2015
  23. physics

    A 74-kg fisherman in a 129-kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of vi = 4.7 m/s as in the figure below. Neglecting water resistance, and assuming the boat is at rest before the package is thrown, find the

    asked on February 22, 2015
  24. physics

    Each of the following objects has a radius of 0.169 m and a mass of 2.02 kg, and each rotates about an axis through its center (as in this table) with an angular speed of 38.6 rad/s. Find the magnitude of the angular momentum of each object. (a) a hoop kg

    asked on March 8, 2015
  25. physics

    A bicycle tire has a mass of 2.54 kg and a radius of 0.346 m. (a) Treating the tire as a hoop, what is its moment of inertia about an axis passing through the hub at its center? kg · m2 (b) What torque is required to produce an angular acceleration of

    asked on March 6, 2015
  26. physics

    The two conditions for equilibrium often result in a system of equations such as F1 + F2 = 44.0 N and 3.00F1 − 8.00F2 = 0. find F1 and find F2

    asked on March 6, 2015
  27. physics

    A bowling ball of mass 7.45 kg is rolling at 2.56 m/s along a level surface. (a) Calculate the ball's translational kinetic energy. J (b) Calculate the ball's rotational kinetic energy. J (c) Calculate the ball's total kinetic energy. J (d) How much work

    asked on March 19, 2015
  28. physics

    A 3.42-kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle. If the ball is in contact with the wall for 0.170 s, what is the average force exerted by

    asked on February 22, 2015
  29. physics

    A bicycle tire has a mass of 2.54 kg and a radius of 0.346 m. (a) Treating the tire as a hoop, what is its moment of inertia about an axis passing through the hub at its center? kg · m2 (b) What torque is required to produce an angular acceleration of

    asked on March 19, 2015
  30. physics

    A mass of 1.50 kg is at (−2.55 m, 0) and a 2.04-kg mass at (4.00 m, 4.00 m). Find the center of mass of the system. ( m, m)

    asked on March 6, 2015
  31. 3rd grade

    when was the red rever cleard for boat travel?

    asked on September 24, 2009
  32. history

    What factors/influences help shape a country's identity? How does the leadership/government of a country generate consensus for this identity? Thank you for using the Jiskha Homework Help Forum. Here are some things to consider: language, technologies,

    asked on February 5, 2007
  33. spelling

    i cant understand v/cv and vc/v patter mean .can you giv me exemple

    asked on November 27, 2012
  34. statistics

    Water sample from 6 public swimming pools are combined for one test regarding bacteria level.Further testing is done if the combined test fails. Past results have shown that there is a 2% chance of unacceptably high bacteria level. Determine the

    asked on June 27, 2010
  35. history

    What do you associate a country's identity? Provive an example to help me understand please! Maybe what sort of things do you associate with a country. Maybe you think of their produce, the wars they fight, or the leader who runs the country. For example,

    asked on February 5, 2007
  36. social studies

    did the railrosds reach shreveport before or after the discovery of oil at caddo lake?

    asked on September 24, 2009
  1. language arts

    is it a?

    posted on March 6, 2018
  2. Math

    is 8.2because the dog round many time

    posted on March 5, 2013
  3. 4th grade math

    32

    posted on May 22, 2012
  4. Geology

    Omg, are u taking Natural Hazzards at UCD? Im having trouble finding all these answers too! Such a horrible class.

    posted on October 3, 2011