4. The kinetic energy (KE) and gravitational potential energy (PE) for an object are shown Energy (J) as functions of time in the graph on the right. What is the change in total mechanical
energy of the object for the 5 seconds shown?
(A) 0 J
(B) 2.5 J
(C) 5 J
(D) 15 J

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

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.

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.