KID behave good dont do this you will not find your self in lala land

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?