Doubling only the mass of a vibrating mass-and-spring system produces what effect on the system's mechanical energy?
A)
increases the energy by a factor of square root of two
B)
increases the energy by a factor of two
C)
increases the energy by a factor of three
D)
increases the energy by a factor of four
E)
produces no change
E
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The lattice parameter of CsCl is 0.4123 nm. Calculate the density of CsCl.
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A certain brand of hot dog cooker applies a potential difference (120 V) to opposite ends of the hot dog and cooks by means of the joule heat produced. If 60 kJ is needed to cook each hot dog, what current is needed to cook four hot dogs simultaneously in 3.0 min?
A. 11 A B. 2.8 A C. 8.3 A D. 2.1 A E. 3.6 A
A neutron and a proton have the same
a. charge. b. half-life. c. mass. d. baryon number.
The mass of the Moon is 7.4 × 1022 kg, its radius is 1.74 × 103 km, and it has no atmosphere. What is the acceleration due to gravity at the surface of the Moon? (G = 6.67 × 10-11 N ? m2/kg2)
A) 2.8 × 106 m/s2 B) 9.8 m/s2 C) 4.9 m/s2 D) 1.6 m/s2 E) 0.80 m/s2