In the circuit shown below, 0.25 A of current flows through a 20-Ω resistor. How much voltage is needed to produce this current? A. 80 V
B. 0.013 V
C. 19.75 V
D. 5 V

Write a question about how changing temperature affects the gas inside the sports ball

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

Chameleons catch insects with their tongues, which they can rapidly extend to great lengths. in a typical strike, the chameleon's tongue accelerates at a remarkable 220 m/s2 for 20 ms, then travels at constant speed for another 30 ms.