a man is using an axe to chop down a tree. After a short time after the axe hits with tree the man hears a clear echo he estimates that the echo is 3 seconds after the axe hits the tree. suggest what type of obstacle might have caused such a clear echo​

When you turn on a battery-operated device, an electrical circuit is

As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less. this is because more and more of the pendulum bob's energy is being transformed into a. heat energy b. kinetic energy c. potential energy d. kinetic energy and potential energy

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.