A 7.7-kg mass vibrates according to the equation x= 4.7cos(2.2t) where x is in meters and t is in seconds. What is the maximum velocity achieved by this oscillation? Round your answer to the nearest tenth.

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

10 newton object is placed 3 meters from the fulcrum. at what distance on the other side would you need to place a 15 newton object to balance the lever? show your work!

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?