Question: 1. A baseball outfielder throws a 0.150 kg baseball at a speed of 40.0 m/s and an initial angle of 32.0°. What is the kinetic energy of the baseball at the highest point of its trajectory? ____ J
2. A simple pendulum, consists of an object suspended by a string. The object is assumed to be a particle. The string, with its top end fixed, has negligible mass and does not stretch. In the absence of air friction, the system oscillates by swinging back and forth in a vertical plane. If the string is 2.45 m long and makes an initial angle of 26.0° with the vertical, calculate the speed of the particle at the following positions.
(a) at the lowest point in its trajectory ______ m/s
(b) when the angle is 15.0° _______ m/s
3.A 190 g particle is released from rest at point A along the horizontal diameter on the inside of a frictionless, hemispherical bowl of radius R = 28.0 cm.
(a) Calculate the gravitational potential energy of the particle-Earth system when the particle is at point A relative to point B. _____ J
(b) Calculate the kinetic energy of the particle at point B. ___ J
(c) Calculate its speed at point B. ______ m/s
(d) Calculate its kinetic energy when the particle is at point C. ______ J
(e) Calculate the potential energy when the particle is at point C. ______J