Darby has a very high-energy dog named Lily. Lily's parents were both very energetic dogs. Darby trains Lily to chase a tennis ball when she throws it and to bring it back. Lily can play fetch for hours and is always ready for a game. How has Lily's behavior been influenced by her heredity?

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.

Alarge box of mass m is pulled across a horizontal frictionless surface by a horizontal rope with tension t. a small box of mass m sits on top of the large box. the coefficients of static and

Could we see a galaxy that is 20 billion light-years away?