Name two things that are used to machines be more efficient

Which instrument is used to measure air temperature

When an object moves in uniform circular motion, the direction of its acceleration is a) in the same direction as its velocity vector. b) in the opposite direction of its velocity vector c) is directed toward the center of its circular path. d) is directed away from the center of its circular path. e) depends on the speed of the object.

Simple machines can a. increase force only b. decrease force only c. increase or decrease force