Abat at rest sends out ultrasonic sound waves at 50.0 khz and receives them returned from an object moving directly away from it at 27.5 m/s. what is the received sound frequency?

Janelle made a hypothesis bout the uneven temperatures inside her house during winter. she believes that 50% of the ducts are blocked and she plans to investigate. if she wants to prove her hypothesis using scientific processes what should she do next?

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

An electric current is flowing through the cord below.what will happen to this current if a magnet is brought near the cord? a. the electric current will stop flowing. b. it will exert a force on the voltage. c. the resistance of the wire will decrease. d. it will exert a force on the electric current.