At 22.0°C an aluminum ring has an inner diameter of 7.000 cm, and a brass rod has a diameter of 7.090 cm. Keeping the brass rod at 22.0°C, which of the following temperatures of the ring will allow the ring to just slip over the brass rod? (?Al = 2.4 × 10^?5 /C°, ?brass = 1.9 × 10^?5/C°)
a. 536°C
b. 418°C
c. 190°C
d. 558°C
e. 725°C
d
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Uniform Circular Motion: A point on a wheel of radius 40 cm that is rotating at a constant 5.0 revolutions per second is located 0.20 m from the axis of rotation. What is the acceleration of that point due to the spin of the wheel?
A. 0.050 m/s2 B. 1.4 m/s2 C. 48 m/s2 D. 200 m/s2 E. 0.00 m/s2
Why was the discovery of Mercury's liquid core a surprise to scientists?
A. Mercury's rotation was too slow to sustain a liquid core. B. Mercury's small size should have allowed it to cool early in its history. C. Mercury's density suggested that there should have been a small solid core. D. Mercury's magnetic field was too weak to be generated by a liquid core.
Suppose you live at latitude 20°S. Based on the given right ascensions and declinations, which of the following stars passes closest to your zenith on its daily path through your sky?
A) Sirius: RA = 6hr 45m, dec = -16°42' B) Canopus: RA = 6hr 24m, dec = -52°41' C) Alpha Centauri: RA = 14hr 40m, dec = -60°50' D) Arcturus: RA = 14hr 16m, dec = +19°11' E) Vega: RA = 18hr 37m, dec = +38°47'
What distinguishes the spectral type of a star?
A. the lines in its spectrum B. its brightness C. its distance D. its velocity