In which situation is the object experiencing unbalanced forces A. a box resting on a horizontal line
B. a car slowing as its reaching a traffic light
C. A car with its cruise control set to 30 km/h
D. A penny at terminal velocity after falling off a building

The magnetic field inside a superconducting solenoid is 4.50 t. the solenoid has an inner diameter of 6.20 cm and a length of 26.0 cm. determine (a) the magnetic energy density in the field and (b) the energy stored in the magnetic field within the solenoid.

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

What causes the formation of ocean currents?