8. A cylindrical tank is 50.0 ft deep, in diameter, and filled to the top with w
ID: 1398169 • Letter: 8
Question
8.
A cylindrical tank is 50.0 ft deep, in diameter, and filled to the top with water. A flashlight shines into the tank from above. What minimum angle can its beam make with the water surface and still illuminate part of the bottom?
53.5°
41.1°
44.5°
49.6°
9.
A 920-g empty iron kettle is put on a hot stove. How much heat must the kettle absorb to raise its temperature from to The specific heat capacity of iron is
33,700 J
40,500 J
40,100 J
8110 J
10.
An ideal gas changes from a state defined by pressure p1 and volume V1 to a state defined by pressure p2 and volume V2. Which set of properties is independent of the path between the two states?
work and heat transfer involving the gas
heat transfered to or from the gas
work performed by or on the gas
change in internal energy of the gas
11.
During each cycle of its operation, an air conditioner transfers 930 kJ of heat from a room and outputs 1730 kJ of heat to the outdoors. What mechanical work is involved per cycle?
2660 kJ of work performed by the air conditioner
800 kJ of work performed on the air conditioner
2660 kJ of work performed on the air conditioner
800 kJ of work performed by the air conditioner
8.
A cylindrical tank is 50.0 ft deep, in diameter, and filled to the top with water. A flashlight shines into the tank from above. What minimum angle can its beam make with the water surface and still illuminate part of the bottom?
53.5°
41.1°
44.5°
49.6°
Explanation / Answer
8) given h=50feet
d=50feet
r=25feet
thetah2=arctan(r/h)
=arctan(25/50)
=arctan(0.5)
thetah2=26.52 degree
using snell's law
n1sinthetha1=n2thetha2
n1=1 for air
n2=1.33 for water
1*sinthetha1=1.33*sin26.52
sinthetha1=36.44 degrees
Now as this is the angle FROM THE NORMAL and the angle must be less than this then the angle from the surface must be GREATER than so(90-36.44)
=53.4 degrees answer
so answer is A
Please raise different questions for other questions
sinthetha1=1.307
thetha1=sin-1(1.307)
=
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