CALC A closed and elevated vertical cylindrical tank with diameter 2.00 m contains water to a depth of 0.800 m. A worker accidently pokes a circular hole with diameter 0.0200 m in the bottom of the tank. As the water drains from the tank, compressed air above the water in the tank maintains a gauge pressure of 5.00 × 10 3 Pa at the surface of the water. Ignore any effects of viscosity, (a) Just after the hole is made, what is the speed of the water as it emerges from the hole? What is the ratio of this speed to the efflux speed if the top of the tank is open to the air? (b) How much time does it take for all the water to drain from the tank? What is the ratio of this time to the time it takes for the tank to drain if the top of the tank is open to the air?
CALC A closed and elevated vertical cylindrical tank with diameter 2.00 m contains water to a depth of 0.800 m. A worker accidently pokes a circular hole with diameter 0.0200 m in the bottom of the tank. As the water drains from the tank, compressed air above the water in the tank maintains a gauge pressure of 5.00 × 10 3 Pa at the surface of the water. Ignore any effects of viscosity, (a) Just after the hole is made, what is the speed of the water as it emerges from the hole? What is the ratio of this speed to the efflux speed if the top of the tank is open to the air? (b) How much time does it take for all the water to drain from the tank? What is the ratio of this time to the time it takes for the tank to drain if the top of the tank is open to the air?
CALC A closed and elevated vertical cylindrical tank with diameter 2.00 m contains water to a depth of 0.800 m. A worker accidently pokes a circular hole with diameter 0.0200 m in the bottom of the tank. As the water drains from the tank, compressed air above the water in the tank maintains a gauge pressure of 5.00 × 103 Pa at the surface of the water. Ignore any effects of viscosity, (a) Just after the hole is made, what is the speed of the water as it emerges from the hole? What is the ratio of this speed to the efflux speed if the top of the tank is open to the air? (b) How much time does it take for all the water to drain from the tank? What is the ratio of this time to the time it takes for the tank to drain if the top of the tank is open to the air?
Blue light has a wavelength of 485 nm. What is the frequency of a photon of blue light?
Question 13
Question 13
What is the wavelength of radiofrequency broadcast of 104 MHz?
Question 14
Question 14
1 Point
3. The output intensity from an x-ray exposure is 4 mGy at 90 cm. What will the intensity of the exposure be at 180 cm?
Question 15
Question 15
1 Point
What is the frequency of an 80 keV x-ray?
Under what condition is IA - BI = A + B?
Vectors
À
and
B
are in the same direction.
Vectors
À
and B
are in opposite directions.
The magnitude of vector
Vectors
À
and
官
B
is zero.
are in perpendicular directions.
For the vectors shown in the figure, express vector
3 in terms of vectors M and N.
M
S
=-M+ Ň
==
S=м- Ñ
S = M +Ñ
+N
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