Calculate the Momentum using the following formula:
Momentum = mass • velocity or p = m • v
1. Jerome plays middle linebacker for South's varsity football team. In a game
against cross-town rival North, he delivered a hit to North's 82-kg running
back, changing his eastward velocity of 5.6 m/s into a westward velocity of
2.5 m/s .
a Determine the initial momentum of the running back.
An object can store energy as the result of its position. Potential energy is the
stored energy of position possessed by an object.
Gravitational potential energy is the energy stored in an object as the result
of its vertical position or height. The energy is stored as the result of the
gravitational attraction of the Earth for the object. PEgrav = mass • g •
height or PEgrav = m *• g • h
2. Mr. DelliGatti decides to go bungee jumping. He goes to the Macau Tower in
China and leaps from a height of 233 meters. If his weight is 86 kilograms,
what would his potential energy be just prior to jumping?
Kinetic energy is the energy of motion. An object that has motion - whether
it is vertical or horizontal motion - has kinetic energy.
KE = 0.5 • m • v 2 where m = mass of object v = speed of object
3. A car has a mass of 2,000 kg and is traveling at 28 meters per second. What
is the car’s kinetic energy?
4. Define heat transfer by Convection and Conduction and explain each
5. Rates of Heat Transfer
Four variables that affect the rate of heat transfer between two locations. The
variables are the temperature difference between the two locations (T 1 & T2
), the material present between the two locations (k), the area through which
the heat will be transferred (A), and the distance it must be transferred (d).
The equation for rate of heat transfer: Rate = k•A•(T1 T2)/d
Question: What is the rate of heat transfer for the area where the window is
located is replaced by a wall with thick insulation. The thermal conductivity
of the same area will be decreased to 0.0039 W/m/°C and the thickness will
be increased to 16 cm. Determine the rate of heat transfer through this area
of 2.16 m 2. The temperature inside the home is 21°C and the temperature
outside the home is -4°C.
6. Predict the following variations on the rate at which heat is transferred by
filling in the blanks.
a. If the area through which heat is transferred is increased by a factor of 2,
then the rate of heat transfer is ________________ (increased, decreased) by a
factor of _________ (number).
b. If the thickness of the material through which heat is transferred is
increased by a factor of 2, then the rate of heat transfer is ________________ by a
factor of _________.
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