Which of the following values of ph will change red litmus paper blue? a. 3.1 b. 6.2 c. 7.0 d. 13.5

An object moves from the position +34m to the position -15m in 15 seconds. what is it's total displacement? what is it's average velocity?

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A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.