The force required to draw back the string of an archer's bow by a distance 'x' from equilibrium position is given by f=kx2. If all the energy stored in the bow is Communicated to arrow .show that the maximum average of the arrow Is given by R= 2Kx2/3 mg

Explain why electric current cannot exist if a current doesn't have a voltage source.

Contrast the force of gravity between these pairs of objects: 1-kg mass and a 2-kg mass that are 1 m apart; a 1-kg mass and a 2-kg mass that are 2 m apart; and two 2=kg masses that are 1 m apart. i dont understand.

Ahypothetical metal has an orthorhombic unit cell for which the a, b, and c lattice parameters are 0.413 nm, 0.665 nm, and 0.876 nm, respectively. (a) if there are 8 atoms per unit cell and the atomic packing factor is 0.536, determine the atomic radius (in nm). (b) if the density is 3.99 g/cm3, calculate the metal's atomic weight (in g/mol).