In a parallel electric circuit, the voltage
a) is different across each branch of the circuit.
b) is the same across all circuit components.
c) must vary with time and is called ac.
d) must never become negative.
b
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A single-shell-single-tube parallel flow heat exchanger is used to cool oil in a large marine diesel engine. River water at 2 kg/s and 15ºC enters the heat exchanger shell whereas engine oil at 1 kg/s and 140ºC enters the tubes. The engine oil has a specific heat of 2.4 kJ/kg?K. The heat exchanger surface area is 7 m^2 and its overall heat transfer conductance is 400 W/m^2?K when new. Determine (a) outlet oil temperature and (b) outlet oil temperature after some time when the river water has produced a fouling factor of 0.0004 m^2?K/W.
What will be an ideal response?
Which of the following best explains the success of the central African rainfall-prediction technique of observing the waxing crescent Moon?
A) When the Moon is aligned in a U-shape, it can hold more water, so there is more rain. When it is tilted, it can hold less, so the weather is drier. B) When the Moon is in Capricorn, there is always more tempestuous weather, while when in Pisces, it is just plain rainy. C) Clouds cover part of the Moon's surface, so the smaller the crescent, the more likely it is to rain. D) The Moon's orientation varies seasonally, and so does the weather. E) The Moon causes the tides and affects the weather.
An object is released from rest when it is a height h above the surface of a planet of mass M and radius R. What is the speed of the object just before striking the surface of the planet? Neglect any air resistance. Let h = 4.0 × 10^6 m, R = 5.0 × 10^6 m, and M = 4.0 × 10^24 kg
a. 7.8 km/s b. 3.5 km/s c. 5.4 km/s d. 6.9 km/s e. 4.8 km/s
The rings of Saturn consist primarily of ________.
A. methane and ammonia B. water ice C. hydrogen and helium D. silicate rocks