An 80.0-kg object is falling and experiences a drag force due to air resistance. The magnitude of this drag force depends on its speed, v, and obeys the equation What is the terminal speed of this object?
A) 6.45 m/s
B) 72.2 m/s
C) 34.2 m/s
D) 12.6 m/s
E) 47.3 m/s
D
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Derive the energy balance equation for a corner control volume in a three-dimensional steady conduction problem with heat generation in a rectangular coordinate system. Assume an adiabatic boundary condition and equal node spacing in all three dimensions.
GIVEN
- Three-dimensional steady conduction in a rectangular coordinate system, corner boundary control
volume with specified temperature boundary condition
FIND
(a) Energy balance equation for the control volume
SKETCH
A solar eclipse that occurs when the moon's umbra reaches Earth's surface is called
a. a total solar eclipse. b. a partial solar eclipse. c. an annular solar eclipse. d. a penumbral solar eclipse. e. an umbral solar eclipse.
The graph shows the force on an object as it moves a distance x. What is the work done by the force when the object moves from 0.0 m to 6.0 m?
A. 14 J
B. 12 J
C. 10 J
D. 8.0 J
E. 6.0 J
As temperatures become large, the denominator in equation T4.41 becomes
A. very large. B. very small. C. approximately 1. D. approximately ?1