When a piece of wood is distorted by a karate chop, the top of the board is compressed while the bottom is stretched as shown. Therefore, you must first

consider the change in length of the bottom of the board where the break

begins. Chantal is a black belt in karate and she breaks a 30.0-cm piece of

wood with a force of 70.0 N, changing it in length by 4.0 104 cm. What is

the cross-sectional area of the piece of wood? (Ywood 1.0 109 N/m2)

What is the kinetic energy of a 10-kg bicycle moving at 10 m/s

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

Apair of 10μf capacitors in a high-power laser are charged to 1.7 kv.a. what charge is stored in each capacitor? b. how much energy is stored in each capacitor?