Two springs are hung from a ceiling and carry identical masses. The first spring has a spring constant twice as large as the second spring. The masses on each spring are pulled down from their equilibrium positions the same distance and are then released. The amplitude of the oscillation is
A. larger for the second spring.
B. It is not possible to know which is larger without knowing the mass
C. larger for the first spring.
D. the same for both springs.
Answer: 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 projectile leaves the ground at 150 m/s and reaches a maximum height of 0.57 km. If there was no air, at what angle above the horizontal did it leave the ground?
What will be an ideal response?
Which fact about comets is FALSE?
A. Comets are a complex mix of ice and dust. B. Comets' tails disappear when they are closest to the Sun. C. Short period comets have orbital periods less than 200 years and have predictable orbits. D. In ancient history, the appearance of a comet was regarded as a sign that unpleasant events would occur. E. The dust tail of a comet is white, diffuse, and curved.
The lowest energy level of a certain quantum harmonic oscillator is 5.00 eV. What is the energy of the next higher level?
A) 15.0 eV B) 7.50 eV C) 10.0 eV D) 50.0 eV E) 20.0 eV