Sally and Susie are astronauts. They went outside the space station to fix something. Although they can see each other, but they couldn’t hear each other. Explain why?

Athin, square metal plate measures 14 cm on each side and has emissivity of 0.60. the plate is heated to a temperature of 745°c. what is the rate at which the plate radiates energy ? the stefan-boltzmann constant is 5.67 × 10-8 w/(m2 ? k4). remember that the plate will radiate energy from both its top and bottom surfaces.

Aforce of 9.00 newtons acts at an angle of 19.0 to the horizontal. what is its component in the horizontal direction?

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.