State the physical characteristics of the three types of radiation from radioactive sources
Alpha particles are the nucleus of a helium atom and carry a +2 charge. Beta particles
are electrons and carry a –1 charge. Gamma rays are electromagnetic radiation of
very high frequency and carry no charge at all.
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This famous image from the Hubble Space Telescope shows what is sometimes called the "pillars of creation." Which of the following best describes what it shows?
A) The pillars are clouds of gas and dust in which many new stars are forming; the edges of the pillars are sculpted by ultraviolet radiation from stars outside the pillars. B) Each of the pillars is a cloud of gas that will give birth to a single star, which will emerge from the top of its pillar. C) There is a hot, young star at the top of each pillar that is shooting a jet of gas that forms the pillar below the star. D) There is a single star outside the frame at the bottom, and the pillars are clouds of accreting particles that will form planets orbiting the star.
Which of the following statements about quasars is not correct?
A. Their cores are extremely large, probably several thousand light-years across. B. Their spectra have the largest redshifts observed. C. They are probably the most distant observable objects. D. They have abnormally high luminosities. E. Sometimes they appear in pairs, due to gravitational lenses formed by intervening galaxies.
An auto, starting from rest, undergoes constant acceleration and covers a distance of 1250 meters. The final speed of the auto is 50 meters/sec. How long does it take the car to cover the 1250 meters?
A. 0.05 s B. 72,000 s C. 50 s D. 30 s
If M = 0.50 kg, L = 1.2 m, and the mass of each connecting rod shown is negligible, what is the rotational inertia about an axis perpendicular to the paper through the center of mass? Treat the mass as particles.
?
?
A. 3.7 kg?m2 B. 2.8 kg?m2 C. 3.2 kg?m2 D. 2.3 kg?m2 E. 3.9 kg?m2