A large cylindrical water tank is mounted on a platform with its central axis vertical. The water level is 3.75 m above the base of the tank, and base is 6.50 m above the ground. A small hole, 2.22 mm in diameter, has formed in the base of the tank
Both the hole and the top of the tank are open to the air. We can ignore air resistance and treat water as an ideal fluid with a density of 1000 kg/m3. (a) How many cubic meters of water per second is this tank losing? (b) How fast is the water from the hole moving just as it reaches the ground?
(a) 3.26 × 10-5 m3/s (b) 14.2 m/s
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Which of the following will allow you to learn something about a transiting planet's atmospheric composition?
A) Compare spectra obtained before and during an eclipse. B) Look for slight variations in the time between transits. C) Use the Doppler method to study the planet throughout a cycle from one transit to the next. D) Calculate the planet's size, and then use size to infer what its atmospheric composition must be.
When a skateboarder pushes on a wall,
A) an interaction occurs between the skateboarder and the wall. B) the wall pushes on the skateboarder. C) such a push couldn't happen unless the wall pushed on the skateboarder. D) all the above E) none of the above
Light strikes a diamond (n = 2.42) at an angle of 60° relative to the normal to the surface. What is the angle of refraction?
A. 21° B. 30° C. 38° D. 69° E. 71°
The pressure inside a commercial airliner is maintained at 1 ATM (1.01 × 10^5 N/m2). What is the outward force exerted on a 1.0 m × 2.0 m cabin door if the outside pressure (at 10 km height) is 0.3 ATM?
a. 1.4 × 10^2 N b. 1.4 × 10^3 N c. 1.4 × 10^4 N d. 1.4 × 10^5 N e. 7.0 × 10^3 N