Physics Heat & Thermodynamics Level: High School
If s well known fact that water has a higher specific heat capacity than iron . Now , consider equal masses of water and iron that are initially in thermal equilibrium . The same amount of heat , 30 calories , is added to each . Which statement is true.a) They remain in thermal equilibrium
b) They are no longer in thermal equilibrium ; the water is warmer .
c) They are longer in thermal equilibrium ; the iron is warmer .
d) It is impossible to say without knowing the exact mass involved and the exact specific heat capacities .
Physics Heat & Thermodynamics Level: High School
The reason that ocean temperature do not vary drastically is that :a) water has a relative high rate of heat conduction .
b) water is good radiator
c) water is relatively high specific heat .
d) water is poor heat conductor.
e) water is a poor convection media
Physics Properties Of Matter Level: High School
An idea gas with internal energy U at 200- degrees C is heated to 400- degrees C . Its internal energy then will be :a) still U
b) 2 U
c) 1.4 U
d) 1.2 U
e) 4.1 U
Physics Heat & Thermodynamics Level: High School
A cup of water is scooped up from a swimming pool of water . Compare the temperature T and the internal energy U of the water in both the cup and the swimming pool .a) T (pool) is greater than T (cup) , and the U is the same .
b) T(pool) is less than T(cup) , and U is the same .
c) T(pool) is equal to T(cup) , and U(pool) is greater than U (cup)
d) T(pool) is equal to T(cup) , and U(pool) is less than U(cup)
e) Both (a) and (b) are correct .
Physics Properties Of Matter Level: High School
Gases
Oxygen molecules are 16 times more massive than hydrogen molecules . At a given temperature , how do their average molecular speeds compare ? The oxygen molecules are moving .a) 4 times faster
b) at ¼ the speed
c) 16 times faster
d) at 1/16 the speed
e) none of the above
Physics Properties Of Matter Level: High School
Gases
A sample of an ideal gas is heated and its Kelvin temperature doubles . What happens to the average speed of the molecules in the sample ?a) It does not change
b) If doubles.
c) It halves.
d) It increases exponentially .
e) None of the above.
Physics Properties Of Matter Level: High School
The number of molecules in one mole of a substance :a) depends on the molecular weight of the substance .
b) depends on the atomic weight of the substance .
c) depends on the density of the substance .
d) depends on the temperature of the substance.
e) is the same for all the substance
Physics Properties Of Matter Level: High School
Gases
According to the ideal gas Law , PV = constant for a given temperature . As a result , an increase in volume corresponds to a decrease in pressure . This happens because the molecules :a) collide with each other more frequently .
b) move slower on the average .
c) strike the container wall less often .
d) transfer less energy to the walls of the container each time they strike it .
e) equal Avogadro’s number .
Physics Properties Of Matter Level: High School
Gases
A container of an ideal gas at 1 atm is compressed to one-third it volume with the temperature held constant .What is its final pressure ?a) 3 atm
b) 1 atm
c) 1/3 atm
d) 9 atm
e) 273 atm
Physics Properties Of Matter Level: High School
Thermal Expansion
Consider a flat steel plate with a hole through it center . When the plate’s temperature is increased , the hole will :a) expand only if it takes up more than half the plate’s surface area .
b) contract if it takes up less than half the plate’s surface area .
c) always contract
d) always expand
e) none of the above
Physics Properties Of Matter Level: High School
A bimetallic strip , consisting of metal G on the top and metal H on the bottom , is rigidly attached to a wall , The coefficient of liner thermal expansion for metal G is greater than that of metal H . If the strip is uniformly heated, it will .a) Curve upward
b) Curve downward
c) Remain horizontal , but get longer
d) Bend in the middle.
e) None of the above.
Physics Properties Of Matter Level: High School
Archimedes’s Principle
A 2.9 kg rectangular air mattress is 2.46 m long , 0.511 m wide , and 0.172 m thick . What mass can it support in water before sinking ? Answer in units of kg .
Physics Properties Of Matter Level: High School
A water bed is 3.47 m on each vertical side and 31.9 cm high . The acceleration of gravity is 9.8 m/s^2 . The density of water is 1000 kg/m^3 . Find its weight . Answer in units of N .b) Find the pressure exerted on the floor when the bed rests in its normal position . Assume that the entire lower surface of the bed makes contact with the floor . Answer in units of Pa .
Physics Properties Of Matter Level: High School
The Mariana Trench, in the Pacific Ocean , is about 11.0 km deep . The acceleration of gravity is 9.81 m/s^2 . If atmosphere pressure at sea level is 1.01 x 10^5 Pa and the density of sea water is 1.025 x 10^3 kg/m^3 . how much pressure would a submarine need to be able to withstand to reach this depth ? Answer in units of Pa .
Physics Properties Of Matter Level: High School
A 79 kg woman balances on one heel of a pair of high-heeled shoes . The acceleration of gravity is 9.8 m/s^2 , If the heel is circular with radius 0.438 cm , What pressure does she exert on the floor ? Answer in units of N/m^2 .