How is the Schwartzschild radius calculated from the mass of a star?
What will be an ideal response?
The Schwartzschild radius is roughly 3 km times the mass of the star in solar masses.
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The interstellar medium is composed of mainly _____
a. equal parts of gas and dust b. mostly dust and some gas c. mostly gas and some dust d. dust only e. gas only
A physical pendulum is composed of a sphere whose center of gravity is attached to a thin rod. The sphere has a moment of inertia of 2/5 
The mass of the sphere is 2.00 kg and has a radius of 30.0 cm. The length of the rod is 50.0 cm. The period of the physical pendulum is
A. 2.45 sec. B. 2.02 sec. C. 1.98 sec. D. 1.52 sec. E. 1.25 sec.
A proton in a certain particle accelerator has a kinetic energy that is equal to its rest energy. What is the momentum of the proton as measured by a physicist working with the accelerator? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 2.51 × 10-19 kg ? m/s B) 2.89 × 10-19 kg ? m/s C) 4.34 × 10-19 kg ? m/s D) 5.01 × 10-19 kg ? m/s E) 8.68 × 10-19 kg ? m/s
A boat travels upstream and after one hour has gone 10 km. The boat next travels downstream and after one hour has gone 16 km. If the boat's speed relative to the water is constant, what is the speed of the current in the river?
a. 1 km/h c. 3 km/h b. 2 km/h d. 4 km/h