A massless spring with force constant 536 N/m is fastened at its left end to a vertical
wall, as shown below.
The acceleration of gravity is 9.8 m/s
2
.
6 kg 3 kg
536 N/m
Initially, the 6 kg block and 3 kg block rest
on a horizontal surface with the 6 kg block in
contact with the spring (but not compressingit) and with the 3 kg block in contact with the
6 kg block. The 6 kg block is then moved to
the left, compressing the spring a distance of
0.4 m, and held in place while the 3 kg block
remains at rest as shown below.
6 kg 3 kg
k 0.4 m
Determine the elastic energy U stored in
the compressed spring.
Answer in units of J.

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

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Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants