Which statement is true? the speed of sound in air is inversely proportional to the temperature of the air. the speed of sound in air is directly proportional to the temperature of the air. the speed of sound in air is twice the temperature of the air. the speed of sound in air is not affected by the temperature of the air.

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.

Which is not true about oxygen-17 and oxygen-18?

Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.