Ethyl glycol at 90ºC flows at 10 m/s through 2 mm diameter heat exchanger tubes. The tube surface temperature is 30ºC at the entrance and the tube is 60 cm long. Estimate the outlet temperature of the ethyl glycol and the outlet tube surface temperature.
What will be an ideal response?
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Magnetic Field of a Long Wire: A long, straight, horizontal wire carries current toward the east. An electron moves toward the east alongside and just south of the wire. What is the direction of the magnetic force on the electron?
A. toward the north B. toward the south C. upward D. downward E. toward the west
A 6.1-g bullet has a velocity of 475 m/s when it penetrates a wooden door to a depth of 3.5 cm. Assuming the frictional force that stops the bullet is constant, how long does it take from the time the bullet hits the door till it comes to a stop?
a. 1.5E–4 s b. 7.4E–5 s c. 4.5E–2 s d. 3.7E–3 s
A diatomic quantum mechanical oscillator has a moment of inertia of 7.73 × 10-45 kg ? m2
What is the rotational energy when it is in the quantum state characterized by L = 2? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s) A) 8.71 × 10-5 eV B) 2.27 × 10-5 eV C) 2.70 × 10-5 eV D) 7.22 × 10-5 eV
Precipitation is produced by
A) a rising air mass. B) a descending air mass. C) condensation of water vapor in the air to make clouds and cloud droplets that fall as liquid water or ice. D) all of the above