Chrxeyshthoufov

Popular questions and responses by Chrxeyshthoufov
  1. Physics

    A 5.1–kg block is pulled along a frictionless floor by a cord that exerts a force P = 12 N at an angle θ = 25° above the horizontal, as shown below. (a) What is the acceleration of the block? (b) The force P is slowly increased. What is the value of P

    asked on February 23, 2014
  2. Physics

    A 1.34‒kg ball is attached to a rigid vertical rod by means of two massless strings each 1.70 m long. The strings are attached to the rod at points 1.70 m apart. The system is rotating about the axis of the rod, both strings being taut and forming an

    asked on February 23, 2014
  3. Physics

    An airplane is flying in a horizontal circle at a speed of 482 km⁄h. The wings of the plane are tilted at 38.2° with respect to the horizontal as shown in the figure below. Find the radius of the circle in which the plane is flying. Assume that the

    asked on February 23, 2014
  4. Physics

    An exceptional standing jump would raise a person 0.80 m off the ground. To do this, the person must first lower himself about 0.20 m prior to jumping. What force must a 70‒kg person, ready to jump at this position, exert against the ground in order to

    asked on February 23, 2014
  5. Physics

    A 4.8‒kg block on a 39° inclined plane is acted on by a horizontal force of 46 N as shown below. The coefficient of kinetic friction between the block and the plane is 0.33. (a) What is the acceleration of the block if it is moving up the plane? (b)

    asked on February 23, 2014
  6. Physics

    A 5 kg block is placed on top of a 10 kg block as shown above. A horizontal force of 45 N is applied to the 10 kg block, while the 5 kg block is tied to the wall. The coefficient of kinetic friction between the moving surfaces is 0.20. Determine (a) the

    asked on February 23, 2014
  7. Physics

    A bullet of mass kg moving at 500 m⁄s embeds itself in a large, fixed piece of wood and travels 6 cm before coming to rest. Assuming that the deceleration of the bullet is constant, find the force exerted by the wood on the bullet.

    asked on February 23, 2014
  8. Physics

    A banked circular highway curve is designed for traffic moving at 90 km/h. The radius of the curve is 70 m. If the coefficient of static friction is 0.30 (wet pavement), at what range of minimum and maximum speeds can a car safely make the curve?

    asked on February 23, 2014
  9. Physics

    A governor (centrifugal pendulum) consists of two 200–g spheres attached by light, rigid 10.0–cm rods to a vertical rotating axle. The rods are hinged so that the spheres swing out from the axle as they rotate with it. However, when the angle θ is

    asked on February 23, 2014
  10. Physics

    The horizontal force F, shown in the figure above, accelerates the 4‒kg block at 1 m/s2 to the right. Assume that the coefficient of kinetic friction is 0.5 for both blocks. Given that the 5‒kg block moves up the slope, find (a) the magnitude of the

    asked on February 23, 2014