What is the purpose of oil used in a car's engine? A) to make it shiny
B) to reduce friction
C) as fuel for the engine
D) to prevent the gasoline from burning

HELPP PLEASE

An object starts from rest at point f and speeds up continuously as it moves around an oval. a. choose a point about 1/8 th of the way around the oval from point f, and label it point g. draw a vector to represent the velocity of the object at point g. b. determine the change in velocity vector   between points f and g.

Which statement correctly describes the relationship between frequency and wavelength?

During which interval are the persons represented by the graph not moving? a) 0 to 0.5 hrs b) 1.5 to 2 hrs c) 2 to 2.5 hrs d) 4.5 to 5 hrs