Category Archives:
Essay Writing Help

A golf ball is launched at an angle of 20° A golf ball is launched at an angle of 20째 to the horizontal, with a speed of 60 m/s and a rotation rate of 90 rad/s. Neglecting air drag, determine the number of revolutions the ball makes by the time it reaches maximum height. Is […]

A 2.20.kg hoop 1.20 m in diameter is rolling A 2.20.kg hoop 1.20 m in diameter is rolling to the right without slipping on a horizontal floor at a steady 3.00 rad/s. (a) How fast is its center moving? (b) What is the total kinetic energy of the hoop? (c) Find the velocity vector of […]

A 2.00-kg textbook rests on a frictionless A 2.00-kg textbook rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.150 m, to a hanging hook with mass 3.00 kg. The system is released from rest, and the books are observed to move 1.20 m in […]

  (a) The angular speed of the spinning flywheels doubled; (b) The total weight is doubled; (c) The moment of inertia about the axis of the spinning flywheel is doubled; (d) The distance from the pivot to the center of gravity is doubled. (e) What happens if all four of the variables in parts (a) […]

A grindstone in the shape of a solid disk A grindstone in the shape of a solid disk with diameter 0.520 m, and a mass of 50.0 kg is rotating at 850 rev/min, you press an ax against the rim with a normal force of 160 N (Fig. 10.43), and the grindstone comes to rest […]

A gyroscope flywheel of radius 2.83 cm is accelerated from A gyroscope flywheel of radius 2.83 cm is accelerated from rest at l4.2 rad/s2 until its angular speed is 2760 rev/min. (a) What is the tangential acceleration of a point on the rim of the flywheel during this spin-up process? (b) What is the radial […]

A flywheel with a diameter of 1.20 m is rotating A flywheel with a diameter of 1.80 m is rotating at an angular speed of220 rev/min. (a) What is the angular speed of the flywheelin rad/s?  rad/s (b) What is the linear speed of a point on the rim of theflywheel?  m/s (c) What constant […]

A good baseball pitcher can throw a baseball toward home A good baseball pitcher can throw a baseball toward home plate at 85 mi/h with a spin of 1800 rev/min. How many revolutions does the baseball make on its way to home plate? For simplicity, assume that the 60 ft path is a straight line. […]

A Figure skater can increase her spin rotation rate from A Figure skater can increase her spin rotation rate from an initial rate of 1.0 rev every 2.0s to a final rate of 3.0 rev/s. If her initial moment of inertia was 4.6 kg m2, what is her final moment of inertia? How does she […]

A drum rotates around its central axis at an angular A drum rotates around its central axis at an angular velocity of 12.60 rad/s. If the drum then slows at a constant rate of 4.20 rad/s2, (a) How much time does it take and (b) Through what angle does it rotate in coming to rest? […]