The flux through a coil changes from 4.0 × 10-5 Wb to 5.0 × 10-5 Wb in 0.10 s. What emf is induced in this coil?
A)
5.0 × 10-4 V
B)
4.0 × 10-4 V
C)
1.0 × 10-4 V
D)
0 V
E)
none of the given answers
C
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Entropy: What is the entropy change of 450 g of water when it changes from (a) liquid to steam at its usual boiling point and (b) ice to liquid at its usual melting point? For water, LF = 0.334 MJ/kg, LV = 2.26 MJ/kg.
What will be an ideal response?
A section of a composite wall with the dimensions shown below has uniform temperatures of 200°C and 50°C over the left and right surfaces, respectively. If the thermal conductivities of the wall materials are: kA = 70 W/(m K), kB = 60 W/(m K), kc = 40 W/(m K) and kD = 20 W/(m K), determine the rate of heat transfer through this section of the wall and the temperatures at the interfaces.
GIVEN
• A section of a composite wall
• Thermal conductivities
? kA = 70 W/(m K)
? kB = 60 W/(m K)
? kC = 40 W/(m K)
? kD = 20 W/(m K)
• Surface temperatures
? Left side (TAs) = 200°C
? Right side (TDs) = 50°C
FIND
(a) Rate of heat transfer through the wall (q) (b) Temperature at the interfaces
ASSUMPTIONS
• One dimensional conduction
• The system is in steady state
• The contact resistances between the materials is negligible
SKETCH
A spaceship, traveling at 0.560c towards a stationary enemy station, shoots a projectile towards the station with a speed of 0.100c relative to the spaceship. What is the speed of the projectile relative to the station?
A) 0.460c B) 0.575c C) 0.600c D) 0.625c E) 0.660c
Although the United States has less than 5% of the world's population, it accounts for approximately ______________ of the world's annual consumption of fossil fuels
a. 15% b. 25% c. 35% d. 45%