Relative to the floor, what potential energy does a 2.5 kg package have that sits on a shelf 2.2 m high

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?