Thermal energy from the Sun travels to Earth by a. conduction b. charged molecules.
c. electromagnetic waves
d. convection currents.

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

Which terms describe the purpose of antennas on devices that use radio waves? transmit and receivemodify and amplifyamplify and receivemodify and transmit