Which scenario best describe an object with a displacement of zero
A bain moves uphill as it travels ma straight path
A person walks 2 miles north and 2 miles west
Aball rolls from the top to the bottom of a bit
Arace car starts and ends at the same point on a track

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.

Afisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. it takes a time of 2.70 s for the boat to travel from its highest point to its lowest, a total distance of 0.700 m. the fisherman sees that the wave crests are spaced a horizontal distance of 6.50 m apart. a. how fast are the waves traveling? b. what is the amplitude a of each wave?