What type of information is available to scientists through a Global Positioning System (GPS) device?

True or false: the revolution of the earth creates day and night as it rotates around the sun

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j