A 1.53-kg piece of iron is hung by a vertical ideal spring. When perturbed slightly, the system is moves up and down in simple harmonic oscillations with a frequency of 1.95 Hz and an amplitude of 7.50 cm.
If we choose the total potential energy (elastic and gravitational) to be zero at the equilibrium position of the hanging iron, what is the total mechanical energy of the system?
A) 0.633 J B) 0.955 J C) 0.646 J D) 0.000 J E) 0.844 J
Question 2
Velma passes Mort at a high speed. Each holds a meter stick, oriented parallel to the direction of relative motion. Mort observes that
A) his meter stick is 1 m long, and Velma's meter stick is longer than 1 m.
B) his meter stick and Velma's meter stick are both shorter than 1 m.
C) his meter stick is longer than 1 m, and Velma's meter stick is 1 m long.
D) his meter stick and Velma's meter stick are both 1 m long.
E) his meter stick is 1 m long, and Velma's meter stick is less than 1 m long.
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