The star nearest the North Celestial Pole is ________.
A. Thuban
B. Vega
C. Denebola
D. Polaris
E. Mizar
Answer: D
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A(n) ____________ is a solar-system object that enters Earth's atmosphere and becomes very hot due to friction between the object and Earth's atmosphere and does not survive to reach the surface
a. asteroid b. meteor c. comet d. meteoroid e. planetesimal
Power: The voltage drop across a metal bar is 5.0 V while a current of 10.0 mA flows through it. How much power does this bar dissipate?
A. 50 mW B. 500 ?W C. 2.5 kW D. 0.50 kW
981539 u; a neutral hydrogen atom has a mass of 1.007825 u; a neutron has a mass of 1.008665 u; and a proton has a mass of 1.007277 u. (1 u = 931.494 MeV/c2)
A) 8.3 MeV B) 6.7 MeV C) 5.4 MeV D) 3.4 MeV E) 2.8 MeV
A doubly charged ion with speed 6.9 × 106 m/s enters a uniform 0.80-T magnetic field, traveling perpendicular to the field. Once in the field, it moves in a circular arc of radius 30 cm
What is the mass of this ion? (e = 1.60 × 10-19 C) A) 3.3 × 10-27 kg B) 6.7 × 10-27 kg C) 8.2 × 10-27 kg D) 11 × 10-27 kg