Students in a physics lab design an experiment to determine the coefficient of static friction between a 1.8-kg jack-o'-lantern and the tabletop on which it rests. Their setup is shown in
the figure below. The basic procedure is to pour sand slowly into the pail until the pumpkin
begins to slide. The pail with the sand in it is then placed on a scale and found to weigh 11 N.
What is the coefficient of static friction between the jack-o'-lantern and the table?

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

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