The kinetic energy of a moving car is less than the amount of chemical potential energy that is released when fuel is burned in the engine. Which
statement best explains why this is so?
A. More of the car's energy is transformed into potential energy the
faster it goes.
B. Friction causes some of the energy released by the fuel to be
transformed into thermal energy,
C. Some chemical energy is transformed into potential energy as the
particles in the fuel are rearranged.
D. The force of gravity transforms some kinetic energy into
gravitational potential energy.

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

From the perspective of an employee that effective channeling of work related information and concerns

Does current flow through or across a resistor?