physics quiz 2
a calorie is defined to be the amount of heat required to raise the temperature of
1 gram of water by 1 degree C
what impulse is need to stop a 1200 kg car traveling at 20 m/s?
24000 N s
what kelvin temp corresponds to room temp of 20 degrees C
293 k
how fast would an 80-kg person need to run to have the same momentum as an 18-wheeler rolling along at 1 mph?
300 mph
what is the probability of throwing two fair six sided dice and obtaining a sum of seven
6/36
rank the three from gratest to smallest according to specific heat
A = B = original bar
Newton's second law can be rearranged to show that the _____ is equal to the ____
change in momentum... impulse
as a result of the tap, the kinetic energy of the ball
does not change
the first law of thermodynamics
is a restatement of the law of conservation of energy
a system consisting of two particles has zero kinetic energy. the momentum of this system
is definitely zero
the first law of thermodynamics
is the basis for the definition of internal energy
why does the coldest part of winter occur during late jan and feb when the shortest day of the year is near dec 21
it takes the release of a lot of thermal energy for the ground to cool off
a system consisting of two particles has zero momentum. the kinetic energy of this system
may or may not be zero
in physics work is defined as the product of the
net force parallel to the motion and the distance traveled.
many people have tried to build perpetual motion machines. our study of physics tells us perpetual motion machines are
not possible to build
the efficiency of a device such as a heat engine is the ratio of its
output to the waste product
count rumfords experiments with boring cannons
showed that heat was not a fluid
gold and silver have densities of 19.3 and 10.5 grams per cubic centimeter, respectively. if you have equal grams of each
the gold has a greater mass
which of the following should be considered the input of a heat engine
the heat taken in from the hot region
which of the following physical quantities is not necessarily an invariant even if the system is closed?
volume
under what conditions is the kinetic energy conserved in a collision?
when the collision is totally elastic
which type of bench would feel the warmest on a cold winters day
wood
a red sports car is driving on the freeway at a constant 70 mph
equal to that of the red sports car
which of the following is not a potential energy
friction
the 12 once boxing gloves used in amateur fights hurt less than the 6 once gloves used in professional fights because the ____ stopping times mean ____ forces.
increased.... smaller