Which of the following is an observation and not an inference? a. a cup with steam coming from it will be hot to the touch. b.dark clouds in the sky will mean rain later in the afternoon. c.bubbles form when two chemicals are mixed together. d.a plastic bag moving along the ground is being pushed by the wind.

Abug is 12 cm from the center of a turntable that is rotating with a frequency of 45 rev/min . what minimum coefficient friction is required so that the bug stays on the turntable?

What do you think car designers do if the damage caused by a crash test is too severe?

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.