In simple harmonic motion, the restoring force must be proportional to the:
A. amplitude
B. frequency
C. velocity
D. displacement
E. displacement squared
Answer: D. displacement
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Mass Sprectrometer: In a mass spectrometer, a single-charged particle has a speed of 1.00 × 106 m/s and enters a uniform magnetic field of 0.200 T at a right angle to the field. The radius of the resulting circular orbit is 20.75 cm. What is the mass of the particle? (e = 1.60 × 10-19 C)
A. 3.20 × 10-27 kg B. 6.64 × 10-27 kg C. 1.67 × 10-27 kg D. 9.11 × 10-31 kg
A 4.00 kg hollow sphere of radius 5.00 cm starts from rest and rolls without slipping down a 30.0 degree incline. If the length of the incline is 50.0 cm, then the velocity of the center of mass of the hollow sphere at the bottom of the incline is
A. 1.28 
B. 1.44
C. 1.65
D. 1.72
E. 1.98
When uranium-238 (Z = 92) is bombarded with a neutron, it can change into __________
Fill in the blank(s) with correct word
Why do astronomers believe that there is a large black hole, around 4 million times the mass of our Sun, in the Galactic center?
What will be an ideal response?