Which of the following items does not use a wheel and axle?

A. a doorknob

B. a light bulb

C. a faucet handle

D. a clock with hands

Read the list of substances Air, Copper, Glass, Gold, Wood which substances have highly electrical conductivity? A) Air and Copper B) Air and Glass C) Copper and Glass D) Copper and Gold

Sound waves in air travel at approximately 330m/s. Calculate the frequency of a 2.5m-long sound wave.

What part of an atom is responsible for producing magnetic fields

What is the primary reason that astronomers put telescopes and other instruments above Earth's atmosphere? The instruments can better view the universe without the distraction of electromagnetic rays emitted by the earth.

Which of these instruments is listed with the wrong type of lens that it uses? •telescope, convex •camera, convex •flashlight, concave •microscope, concave

What are the steps that produce electricity from this fuel

Adrian read about a new antimicrobial in a popular magazine. The advertisement claimed that the product Bactokil prevents bacterial growth. So, Adrian conducted a controlled experiment to test the product claims.

A world-class sprinter can burst out of the blocks to essentially top speed (of about 11.5 m/s) in the first 15.0 m of the race. what is the average acceleration of this sprinter, and how long does it take her to reach that speed?

How are primary and secondary succession similar and how are they different?

What relates the net force exerted on an object to its mass and acceleration?