PLEASE HELP Captain Jack Sparrow hangs from the rigging of the Black Pearl. If Captain Jack Sparrow has a mass of 78 kg and is currently 8.7 m above the deck of the Black Pearl, what is his potential energy?

Equation for PE is mxgxh

A1kg cart slams into a stationary 1kg cart at 2 m/s. the carts stick together and move forward at a speed of 1 m/sl. determine whether kinetic energy was conserved in the collision. use the law of conservation of energy to explain the collision

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz