Which of the following are good ways to test whether a solution is an acid or a base?

Tasting it

Litmus paper

Phenolphthalein

Touching it

The slotted arm OA rotates about a fixed axis through O. At the instant under consideration, θ = 36°, θ˙ = 36 deg/s, and θ¨ = 26 deg/s2.

Which statement explains the first law of thermodynamics? Heat is created, but not destroyed or transformed. Heat is transformed, but not created or destroyed. Heat is destroyed, but not created or transformed.

Why do you rotate when you hold a spinning wheel?

Suppose you push a toy train with a force of 3 N east. The train has a mass of 0.5 kg. What is its acceleration? A. 0.17 m/s2 east B. 1.5 m/s2 east C. 6 m/s2 east D. 30 m/s2 east

What does polarization demonstrate about the wave form of light? a. the transverse wave nature of light b. the phenomena of atmospheric wave refraction c. bending of light waves as they passes from one medium to another

Which of the following choices best represents a potential stressor?

How do you distinguish between speed, velocity, and acceleration?

The force of friction on a sliding object is 10n. the applied force needed to maintain a constant velocity is:

What is the best hypothesis to use for this investigation

Quantum physics would most likely be needed to understand the motion of which of the following? A. an atom B. a cell C. a ball D. a galaxy