physics quiz 2

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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


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