Worksheet 6 Gravity
Fill in the blank spaces

Gravity is a "a). .force"
which acts on objects without
b). ..them. Gravitational
force c). .(attracts/repels)
every object in the Universe.
Gravity is what makes everything near the
Earth d. . Gravity holds
the Earth in orbit around the e).
and holds all the stars together in a
f)
Gravity pulls on everything which has
g) . This is the amount matter
in an object, measured in units of h).
Your weight is the i).
..due to
j). ..pulling on your mass.
The k)...
...of any object stays the
same, but its 1). .changes
depending on where it is.

Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. provide a plausible explanation for this situation (with supporting calculations) by considering a room whose air temperature is maintained at 20â°c throughout the year, while the walls of the room are nominally at 27â°c and 14â°c in the summer and winter, respectively. the exposed surface of a person in the room may be assumed to be at a temperature of 32â°c throughout the year and to have an emissivity of 0.90. the coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 w/m2 â‹…â‹… k. what is the ratio of the thermal resistance due to convection to the thermal resistance due to radiation in the summer? what is the ratio of thermal resistances in the winter