Water flows through a horizontal pipe of cross-sectional area 10. cm2 at a pressure of 0.25 atm. The flow rate is 1.0 L/s. At a valve, the effective cross-sectional area of the pipe is reduced to 5.0 cm2. What is the pressure at the valve?
A) 7.7 × 103 Pa
B) 0.200 atm
C) 0.112 atm
D) 0.235 atm
E) 0.157 atm
D
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Latent Heats: A beaker of negligible heat capacity contains 456 g of ice at -25.0°C. A lab technician begins to supply heat to the container at the rate of 1000 J/min. How long after starting will it take before the temperature starts to rise above 0°C? The specific heat of ice is 2090 J/kg ? K and the latent heat of fusion of water is 33.5 × 104 J/kg.
Fill in the blank(s) with the appropriate word(s).
The Big Bang refers to
A. the origin of the heavy elements in a supernova. B. the creation of the Solar System. C. the origin of the Universe. D. the creation of the Moon. E. None of these choices is correct.
Which of following statements about the image formed by a single converging lens are true? (There could be more than one correct choice.)
A) The image is always real. B) The image is always virtual. C) The image is always inverted. D) The image is always upright. E) None of the above choices are correct.
A model car is propelled by a cylinder of carbon dioxide gas. The cylinder emits gas at a rate of 5.00 g/s with an exit speed of 80.0 m/s. The car has a mass of 455 g, including the CO2 cylinder. Starting from rest, what is the car's initial acceleration?
a. 0.879 m/s2 b. 40.0 m/s2 c. 36.4 m/s2 d. 7.28 m/s2 e. 1.38 m/s2