After a supernova event, what is left behind?
A) always a white dwarf
B) always a neutron star
C) always a black hole
D) either a white dwarf or a neutron star
E) either a neutron star or a black hole
E
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A Trombe wall is a masonry wall often used in passive solar homes to store solar energy. Suppose that such a wall, fabricated from 20-cm-thick solid concrete blocks (k = 0.13 W/(mK), ? = 0.05 × 10–5 m2/s) is initially at 15°C in equilibrium with the room in which it is located. It is suddenly exposed to sunlight and absorbs 500 W/m2 on the exposed face. The exposed face loses heat by radiation and convection to the outside ambient temperature of –15°C through a combined heat transfer coefficient of 10 W/(m2 K). The other face of the wall is exposed to the room air through a heat transfer coefficient of 10 W/(m2 K). Assuming that the room air temperature does not change, determine the maximum temperature in the wall after 4 hours of exposure and the net heat transferred to the room
in order to obtain results to graph the temperature distribution in the Trombe wall after 2, 4, 6, and 8 hours of exposure. GIVEN • Trombe wall suddenly exposed to sunlight FIND (a) Graph the temperature distribution in Trombe wall after 2, 4, 6 and 8 hours of exposure.
An alpha particle has a mass of 6.64 × 10-27 kg and a charge of 3.20 × 10-19 C, and it is traveling at 0.9650c
(c = 3.00 × 108 m/s), 1 eV = 1.60 × 10-19 J) (a) What is its rest energy (in GeV)? (b) What is its total energy (in GeV)? (c) What is its kinetic energy (in GeV)?
True or False: A radioactive atom always decays after two half-lives have elapsed
1.False 2.True
A point charge (-5.0 mC) is placed on the x axis at x = 4.0 cm, and a second charge (+5.0 mC) is placed on the x axis at x = -4.0 cm. What is the magnitude of the electric force on a third charge (+2.5 mC) placed on the y axis at y = 3.0 cm?
a. 90 N b. 45 N c. 54 N d. 72 N e. 36 N