The ________ hypothesis was considered plausible in the 1800s, but is it no longer taken seriously
Fill in the blank(s) with correct word
collision
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A block is placed in oscillation on a frictionless horizontal surface attached to a spring that requires 125 N for the block to be stretched 15 cm away from equilibrium. From this position it is released, and oscillates with a period of 0.25 s. What is the mass of the block?
A. 0.66 kg B. 4.1 kg C. 1.3 kg D. 5.3 kg
A 120 N picture hangs from a nail in the wall. The maximum shear stress the nail can sustain is 1.00 
The smallest diameter the nail can be is
A. 10.5 mm. B. 12.4 mm. C. 13.7 mm. D. 14.4 mm. E. 15.9 mm.
A 2.00-kg object is attached to an ideal massless horizontal spring of spring constant 100.0 N/m and is at rest on a frictionless horizontal table
The spring is aligned along the x-axis and is fixed to a peg in the table. Suddenly this mass is struck by another 2.00-kg object traveling along the x-axis at 3.00 m/s, and the two masses stick together. What are the amplitude and period of the oscillations that result from this collision? A) 0.300 m, 1.26 s B) 0.300 m, 0.889 s C) 0.424 m, 0.889 s D) 0.424 m, 1.26 s E) 0.424 m, 5.00 s
Galaxies seem to be made mostly of dark matter. One type of evidence for this comes from observations of
A) the redshift in the light from the explosions of distant supernovas. B) the redshift in the light from the earliest galaxies in the universe. C) Both of the above. D) the speeds at which gas clouds orbit the centers of galaxies. E) distant quasars.