A sound wave takes 0.2 seconds to travel 306 meters. What is the speed of sound in this material? Through
which of the materials in Figure 24.23 is the wave
traveling?

What will a positive and a negative charge do if they are separated from each other?

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?