Astronaut Mark Uri is space-traveling from planet X to planet Y at a speed of 0.65c relative to the planets, which are at rest relative to each other
When he is precisely halfway between the planets, a distance of 1.0 light-hour from each one as measured in the planet frame, nuclear devices are detonated on both planets. The explosions are simultaneous in Mark's frame. What is the difference in the time of arrival of the flashes from the explosions as observed by Mark?
A) 0 min
B) 180 min
C) 90 min
D) 360 min
E) 113 min
A
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Radioactivity Basics: During ?- decay
A. a neutron is transformed to a proton. B. a proton is transformed to a neutron. C. a neutron is ejected from the nucleus. D. a proton is ejected from the nucleus. E. the number of nucleons increases.
What is wrong with the following statements? A fixed quantity of ideal gas at constant volume is warmed from a temperature of 20°C to 40°C
The pressure in the gas doubles during this process because the temperature doubles. A) The appropriate temperature does not double during this process, so the pressure does not double either. B) It is impossible to keep a fixed quantity of gas at constant volume during the temperature change specified in the problem. C) The pressure changes to one half its initial value during this process. D) The conclusion regarding the pressure cannot be reached because the mass of the ideal gas particles is unknown. E) The pressure change will depend on whether the ideal gas particles are monatomic or polyatomic.
A 385-g tile hangs from one end of a string that goes over a pulley with a moment of inertia of 0.0125kg.m2 and a radius of 15.0 cm. A mass of 710 g hangs from the other end of the string. When the tiles are released, the larger one accelerates downward while the lighter one accelerates upward. The pulley has no friction in its axle and turns without the string slipping. What is the tension in the string on the side of the 710-g tile?
A) 9.77 N B) 5.59 N C) 3.68 N D) 6.87 N E) 4.41 N
Size of the Nucleus: An excited 
U* nucleus undergoes fission into two fragments as follows:
U* ? 
Ba + 
KrIf, at the instant of fission, the Ba and Kr fragments are spherical and just barely in contact, what is the electrostatic potential energy of these two fragments? (1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C, 1/4??0 = 8.99 ×
109 N ? m2/C2) A. 230 MeV B. 240 MeV C. 250 MeV D. 260 MeV E. 270 MeV