You stand on a spherical, airless asteroid that you know has a radius of 65 km. When you drop a feather, it falls 45 cm in the first second of fall. What is the mass of the asteroid?.

Velocity is a description of both speed and direction, therefore it - a vector - a force arrow - the same as acceleration - a magnitude

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?